Date: Thu, 30 Jan 14 01:19:25 GMT Subject: hep-ph daily 19 new + 9 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: hep-ph@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 28 Jan 14 21:00:00 GMT to Wed 29 Jan 14 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1401.7327 Date: Tue, 28 Jan 2014 21:00:27 GMT (137kb,D) Title: The Higgs Mass and the Stueckelberg Mechanism in Supersymmetry Authors: Pavel Fileviez Perez, Sogee Spinner Categories: hep-ph hep-th \\ We investigate a class of theories where the mass of the lightest Higgs boson of the Minimal Supersymmetric Standard Model (MSSM) can be larger than the Z gauge boson mass at tree level. In this context the MSSM fields feel a new force, whose corresponding gauge boson attains its mass through the Stueckelberg mechanism. We show how one can achieve a Higgs mass around 126 GeV without assuming a heavy stop spectrum or a large stop trilinear term. The application of this class of models to the conservation of R-parity is also discussed. \\ ( http://arxiv.org/abs/1401.7327 , 137kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7339 Date: Tue, 28 Jan 2014 21:03:27 GMT (48kb,D) Title: Distinguishing axions from generic light scalars using EDM and fifth-force experiments Authors: Sonny Mantry, Mario Pitschmann, Michael J. Ramsey-Musolf Categories: hep-ph hep-ex nucl-ex Comments: 27 pages, 5 figures \\ We derive electric dipole moment (EDM) constraints on possible new macroscopic time reversal and parity violating (TVPV) spin-dependent forces. These constraints are compared to those derived from direct searches in fifth-force experiments and from combining laboratory searches with astrophysical bounds on stellar energy loss. For axion-mediated TVPV spin-dependent forces, EDM constraints dominate over fifth-force limits by several orders of magnitude. However, we show that for a generic light scalar, unrelated to the strong CP problem, present bounds from direct fifth- force searches are more stringent than those inferred from EDM limits, for the interaction ranges explored by fifth-force experiments. Thus, correlating observations in EDM and fifth-force experiments could help distinguish axions from more generic light scalar scenarios. \\ ( http://arxiv.org/abs/1401.7339 , 48kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7340 Date: Tue, 28 Jan 2014 21:05:23 GMT (138kb) Title: Higgs pair production at the LHC with NLO and parton-shower effects Authors: R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, P. Torrielli, E. Vryonidou, M. Zaro Categories: hep-ph Comments: 11 pages, 7 figures Report-no: CERN-PH-TH/2014-014, CP3-14-07, ZU-TH03/14 \\ We present predictions for the SM-Higgs-pair production channels of relevance at the LHC: gluon-gluon fusion, VBF, and top-pair, W, Z and single-top associated production. All these results are at the NLO accuracy in QCD, and matched to parton showers by means of the MC@NLO method; hence, they are fully differential. With the exception of the gluon-gluon fusion process, for which a special treatment is needed in order to improve upon the infinite-top-mass limit, our predictions are obtained in a fully automatic way within the publicly available MadGraph5_aMC@NLO framework. We show that for all channels in general, and for gluon-gluon fusion and top-pair associated production in particular, NLO corrections reduce the theoretical uncertainties, and are needed in order to arrive at reliable predictions for total rates as well as for distributions. \\ ( http://arxiv.org/abs/1401.7340 , 138kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7351 Date: Tue, 28 Jan 2014 21:55:04 GMT (21kb) Title: Selection Rules for Hadronic Transitions of XYZ Mesons Authors: Eric Braaten, Christian Langmack, D. Hudson Smith Categories: hep-ph Comments: 5 pages \\ Many of the XYZ mesons discovered in the last decade can be identified as bound states of a heavy quark and antiquark in Born-Oppenheimer (B-O) potentials defined by the energy of gluon and light-quark fields in the presence of static color sources. The mesons include quarkonium hybrids, which are bound states in excited flavor-singlet B-O potentials, and quarkonium tetraquarks, which are bound states in flavor-nonsinglet B-O potentials. The deepest hybrid potentials are known from lattice QCD calculations. The deepest tetraquark potentials can be inferred from lattice QCD calculations of static adjoint mesons. Selection rules for hadronic transitions are derived and used to identify XYZ mesons that are candidates for ground-state energy levels in the B-O potentials for charmonium hybrids and tetraquarks. \\ ( http://arxiv.org/abs/1401.7351 , 21kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7357 Date: Tue, 28 Jan 2014 22:39:56 GMT (25kb) Title: On Neutrino Masses in the MSSM with BRpV Authors: Marco A. Diaz, Maximiliano Rivera, Nicolas Rojas Categories: hep-ph Comments: 21 pages, 3 figures. First version \\ One loop corrections to the neutrino mass matrix within the MSSM with Bilinear R Parity Violation are calculated, paying attention to the approach in which an effective $3\times 3$ neutrino mass matrix is used. The full mass matrix is block diagonalized, it is found that second and third order terms can be numerically important, and this is analytically understood. Top-stop loops do not contribute to the effective $3\times 3$ at first order, nevertheless they contribute at third. An improved $3\times 3$ approach that include these effects is proposed. \\ ( http://arxiv.org/abs/1401.7357 , 25kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7399 Date: Wed, 29 Jan 2014 02:56:12 GMT (229kb) Title: Next to leading order calculation with dimensional regularization in Nambu--Jona-Lasinio Model Authors: T. Inagaki, D. Kimura, H. Kohyama Categories: hep-ph Comments: 8 pages, 3 figures Report-no: HUPD1314 \\ The Nambu--Jona-Lasinio model is investigated in the $1/N_c$ expansion with the dimensional regularization. At the four-dimensional limit the meson propagators have simple forms in the leading order of the $1/N_c$ expansion. Thus the next to leading order calculation reduces to an ordinary one loop calculation. Here we obtain an explicit form of the $1/N_c$ correction and numerically evaluate the $N_c$ dependence for the gap equation. \\ ( http://arxiv.org/abs/1401.7399 , 229kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7420 Date: Wed, 29 Jan 2014 07:19:23 GMT (63kb) Title: Quark tensor and axial charges within the Schwinger-Dyson formalism Authors: Nodoka Yamanaka, Takahiro M. Doi, Shotaro Imai, Hideo Suganuma Categories: hep-ph Comments: 5 pages, 4 figures, Contribution of proceedings of XV International Conference on Hadron Spectroscopy-Hadron 2013 (Hadron 2013) \\ We calculate the tensor and axial charges of the quark in the Schwinger-Dyson formalism of Landau gauge QCD. It is found that the dressed tensor and isovector axial charges of the quark are suppressed against the bare quark contribution, and the result agrees qualitatively with the experimental data. We show that this is due to the superposition of the spin flip of the quark arising from the successive emission of gluons which dress the vertex. For the isoscalar quark axial charge, we have analyzed the Schwinger-Dyson equation by including the leading unquenching quark-loop effect. It is found that the suppression is more significant, due to the axial anomaly effect. \\ ( http://arxiv.org/abs/1401.7420 , 63kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7431 Date: Wed, 29 Jan 2014 08:28:44 GMT (368kb) Title: Reggeon Field Theory for Large Pomeron Loops Authors: Tolga Altinoluk, Alex Kovner, Eugene Levin, and Michael Lublinsky Categories: hep-ph hep-th Comments: 38 pages, 4 figures \\ We analyze the range of applicability of the high energy Reggeon Field Theory $H_{RFT}$ derived in [1]. We show that this theory is valid as long as at any intermediate value of rapidity $\eta$ throughout the evolution at least one of the colliding objects is dilute. Importantly, at some values of $\eta$ the dilute object could be the projectile, while at others it could be the target, so that $H_{RFT}$ does not reduce to either $H_{JIMWLK}$ or $H_{KLWMIJ}$. When both objects are dense, corrections to the evolution not accounted for in [1] become important. The same limitation applies to other approaches to high energy evolution available today, such as for example [3] and [4]. We also show that, in its regime of applicability $H_{RFT}$ can be simplified. We derive the simpler version of $H_{RFT}$ and in the large $N_c$ limit rewrite it in terms of the Reggeon creation and annihilation operators. The resulting $H_{RFT}$ is explicitly self dual and provides the generalization of the Pomeron calculus developed in [4] by including higher Reggeons in the evolution. It is applicable for description of `large' Pomeron loops, namely Reggeon graphs where all the splittings occur close in rapidity to one dilute object (projectile), while all the merging close to the other one (target). Additionally we derive, in the same regime expressions for single and double inclusive gluon production (where the gluons are not separated by a large rapidity interval) in terms of the Reggeon degrees of freedom. \\ ( http://arxiv.org/abs/1401.7431 , 368kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7464 Date: Wed, 29 Jan 2014 10:43:39 GMT (40kb) Title: Triangular flow of thermal photons from an event-by-event hydrodynamic model for 2.76A TeV Pb+Pb collisions at LHC Authors: Rupa Chatterjee, Dinesh K. Srivastava, and Thorsten Renk Categories: hep-ph nucl-th Comments: 6 pages, 5 figures \\ We calculate the triangular flow parameter $v_3$ of thermal photons from an event-by-event ideal hydrodynamic model for $0--40\%$ central collisions of Pb nuclei at $\sqrt{s_{NN}}$=2.76 TeV at LHC. $v_3$ determined with respect to the participant plane (PP) is found to be non-zero, positive and its $p_T$ dependence is qualitatively similar to the elliptic flow parameter $v_2$(PP) of thermal photons in the range $1 \le p_T \le 6$ GeV/$c$. In the range $p_T \, \le $ 3 GeV/$c$, $v_3$(PP) is found to be about $50--75\%$ of $v_2$(PP) and for $p_T \, >$ 3 GeV/$c$ the two anisotropy parameters become comparable. The local fluctuations in the initial density distribution as well as the initial global geometry of the produced matter in the event-by-event hydrodynamic framework are responsible for this substantial value of $v_3({\rm PP})$. However, as expected, the triangular flow parameter calculated with respect to the reaction plane $v_3$(RP) is found to be close to zero. We show that $v_3$(PP) strongly depends on the value of the fluctuation size scale $\sigma$ especially in the higher $p_T \, (\ge 3 {\rm GeV}/c)$ region where a larger value of $\sigma$ results in a smaller $v_3({\rm PP})$. In addition, the $v_3{\rm (PP)}$ is found to increase with the assumed formation time of the thermalized system. \\ ( http://arxiv.org/abs/1401.7464 , 40kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7503 Date: Wed, 29 Jan 2014 13:09:07 GMT (11kb) Title: Towards computing the lepton and quark mass spectra and their consequences Authors: Ji\v{r}\'i Ho\v{s}ek Categories: hep-ph Comments: 5 pages \\ We demonstrate that the chiral gauge flavor $SU(3)_f$ dynamics spontaneously generates the chiral symmetry breaking fermion self energies $\Sigma(p^2)$ resulting in wide and wild spectra of lepton and quark masses. The Goldstone theorem then necessarily implies: (1) Gauge bosons of gauged chiral symmetries absorb the underlying 'would-be' Nambu-Goldstone (NG) bosons and become massive. Masses are determined by $\Sigma(p^2)$s of those fermions to which they couple, and by the corresponding gauge coupling constants. (2) Charges of anomalous Abelian chiral fermion currents create composite mixed-parity pseudo NG bosons with calculable couplings to fermions and gauge bosons: (i) the Higgs-looking $h$ with mass due to the $SU(3)_f$ instanton; (ii) the Weinberg-Wilczek axion $a$ with mass due to the QCD instanton; (iii) the Anselm-Uraltsev arion $b$ with mass due to the electroweak instanton. (3) There are the true composite NG bosons, the majorons. \\ ( http://arxiv.org/abs/1401.7503 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7534 Date: Wed, 29 Jan 2014 15:10:24 GMT (242kb) Title: Correlation between mean transverse momentum and multiplicity of charged particles in $pp$ and $p\bar{p}$ collisions: from ISR to LHC Authors: E.O. Bodnya (1), V.N. Kovalenko (2), A.M. Puchkov (2) and G.A. Feofilov (2) ((1) University of California, Berkeley, USA, (2) Saint Petersburg State University, Russia) Categories: hep-ph nucl-th Comments: 10 pages, 10 figures, to appear in proc. Esp-Rus2013 \\ We present our analysis of the available experimental data on correlation between mean transverse momentum and charged particles multiplicity ($\langle p_T \rangle$-$N_{ch}$) at central rapidity in $pp$ and $p\bar{p}$ collisions at $\sqrt{s}$ from 17 GeV to 7 TeV. A multi-pomeron exchange model based on Regge-Gribov approach provides quantitative description of $\langle p_T \rangle$-$N_{ch}$ correlation data and their energy dependence. Results are found to be in agreement with string fusion model hypothesis. \\ ( http://arxiv.org/abs/1401.7534 , 242kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7551 Date: Wed, 29 Jan 2014 15:35:11 GMT (3457kb) Title: The amazing properties of crystalline color superconductors Authors: Massimo Mannarelli Categories: hep-ph astro-ph.SR cond-mat.quant-gas Comments: 12 pages, 5 figures. Proceedings of the XIV Convegno di Cortona su Problemi di Fisica Nucleare Teorica \\ This paper is a brief journey into the amazing realm of crystalline color superconductors. Starting from a qualitative description of superfluids, superconductors and supersolids, we show how inhomogeneous phases may arise when the system is under stress. These basic concepts are then extended to quark matter, in which a richer variety of phases can be realized. Then, the most interesting properties of the crystalline color superconductors are presented. This brief journey ends with a discussion of crystalline color superconductors in compact stars and related astrophysical observables. We aim at providing a pedagogical introduction for nonexpert in the field to a few interesting properties of crystalline color superconductors, without discussing the methods and the technicalities. Thus, the results are presented without a proof. However, we try to give a qualitatively clear description of the main concepts, using standard quantum field theory and analogies with condensed matter systems. \\ ( http://arxiv.org/abs/1401.7551 , 3457kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7580 Date: Fri, 24 Jan 2014 01:31:33 GMT (10kb) Title: Strong decays of the bottom mesons $B_1(5721)$, $B_2(5747)$, $B_{s1}(5830)$, $B_{s2}(5840)$ and $B(5970)$ Authors: Zhi-Gang Wang Categories: hep-ph hep-ex Comments: 12 pages \\ In this article, we study the two-body strong decays of the bottom mesons with the heavy meson effective theory in the leading order approximation, and obtain all the analytical expressions of the decay widths of the light pseudoscalar mesons transitions among the S-wave, P-wave and D-wave bottom mesons. As an application, we tentatively assign the bottom meson $B(5970)$ as the $2{\rm S}\,1^-$, $1{\rm D}\,1^-$ and $1{\rm D}\,3^-$ states, respectively, and calculate the decay widths of the $B_1(5721)$, $B_2(5747)$, $B_{s1}(5830)$, $B_{s2}(5840)$ and $B(5970)$, which can be confronted with the experimental data in the future. \\ ( http://arxiv.org/abs/1401.7580 , 10kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7587 Date: Wed, 29 Jan 2014 17:00:51 GMT (250kb,D) Title: Spin correlations in the Drell-Yan process, parton entanglement, and other unconventional QCD effects Authors: Otto Nachtmann Categories: hep-ph Comments: 40 pages \\ We review ideas on the structure of the QCD vacuum which had served as motivation for the discussion of various non-standard QCD effects in high-energy reactions in articles from 1984 to 1995. These effects include, in particular, transverse-momentum and spin correlations in the Drell-Yan process and soft photon production in hadron-hadron collisions. We discuss the relation of the approach introduced in the above-mentioned articles to the approach, developed later, using transverse-momentum-dependent parton distributions (TDMs). The latter approach is a special case of our more general one which allows for parton entanglement in high-energy reactions. We discuss signatures of parton entanglement in the Drell-Yan reaction. Also for Higgs-boson production in pp collisions via gluon-gluon annihilation effects of entanglement of the two gluons are discussed and are found to be potentially important. These effects can be looked for in the current LHC experiments. In our opinion studying parton-entanglement effects in high-energy reactions is, on the one hand, very worthwhile by itself and, on the other hand, it allows to perform quantitative tests of standard factorisation assumptions. \\ ( http://arxiv.org/abs/1401.7587 , 250kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7611 Date: Wed, 29 Jan 2014 17:52:48 GMT (1226kb,D) Title: Accessing the Transverse Dynamics and the Polarization of the Gluons inside the Proton at the LHC Authors: Wilco J. den Dunnen, Jean-Philippe Lansberg, Cristian Pisano, Marc Schlegel Categories: hep-ph hep-ex Comments: 5 pages, 3 figures Report-no: NIKHEF-2013-040 \\ We argue that the study of heavy quarkonia, in particular that of $\Upsilon$, produced back-to-back with an isolated photon in $pp$ collisions at the LHC is the best --and currently unique-- way to access the distribution of both the transverse momentum and the polarization of the gluon in an unpolarized proton. These encode fundamental information on the dynamics of QCD. We have derived analytical expressions for various transverse-momentum distributions which can be measured at the LHC and which allow for a direct extraction of the aforementioned quantities. To assess the feasibility of such measurements, we have evaluated the expected yields and the relevant transverse-momentum distributions for different models of the gluon dynamics inside a proton. \\ ( http://arxiv.org/abs/1401.7611 , 1226kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7613 Date: Wed, 29 Jan 2014 18:19:54 GMT (407kb) Title: Energy density fluctuations in Early Universe Authors: G. L. Guardo, V. Greco and M. Ruggieri Categories: hep-ph Comments: 4 pages, 2 figures. Talk given at Sventh European Summer School on Experimental Nuclear Astrophysics, 15-27 September 2013, Santa Tecla (CT) - Italy \\ The primordial nucleosinthesys of the element can be influenced by the transitions of phase that take place after the Big Bang, such as the QCD transition. In order to study the effect of this phase transition, in this work we compute the time evolution of thermodynamical quantities of the early universe, focusing on temperature and energy density fluctuations, by solving the relevant equations of motion using as input the lattice QCD equation of state to describe the strongly interacting matter in the early universe plasma. We also study the effect of a primordial strong magnetic field by means of a phenomenological equation of state. Our results show that small inhomogeneities of strongly interacting matter in the early Universe are moderately damped during the crossover. \\ ( http://arxiv.org/abs/1401.7613 , 407kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7621 Date: Wed, 29 Jan 2014 18:52:15 GMT (949kb) Title: Deeply Virtual Compton Scattering to the twist-four accuracy: Impact of finite-$t$ and target mass corrections Authors: Vladimir M. Braun, Alexander N. Manashov, Dieter Mueller, and Bjoern M. Pirnay Categories: hep-ph Comments: 34 pages, 11 figures, 1 table \\ We carry out the first complete calculation of kinematic power corrections $\sim t/Q^2$ and $\sim m^2/Q^2$ to several key observables in Deeply Virtual Compton Scattering. The issue of convention dependence of the leading twist approximation is discussed in detail. In addition we work out representations for the higher twist corrections in terms of double distributions, Mellin-Barnes integrals and also within a dissipative framework. This study removes an important source of uncertainties in the QCD predictions for intermediate photon virtualities $Q^2\sim 1$-$5\,{\rm GeV}^2$ that are accessible in the existing and planned experiments. In particular the finite-$t$ corrections are significant and must be taken into account in the data analysis. \\ ( http://arxiv.org/abs/1401.7621 , 949kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7630 Date: Wed, 29 Jan 2014 19:21:23 GMT (323kb) Title: Nuclear and partonic dynamics in the EMC effect at Next-to-Next-to-Leading order Authors: S. Atashbar Tehrani Categories: hep-ph Comments: arXiv admin note: text overlap with arXiv:hep-ex/0610061 by other authors without attribution \\ We study in details the parameterizations of the nuclear parton distributions at the next-to-next-to-leading order (NNLO) of $\alpha_s$. In low $x$ and $Q_0^2$, we observe negative gluon distribution at this order which signals the saturation condition or the quark-gluon plasma condition. Our study also shows the gluon distribution at (NNLO) is less than next-to-leading order (NLO) of $\alpha_s$, and the sea quark distribution at (NNLO) is larger than (NLO). \\ ( http://arxiv.org/abs/1401.7630 , 323kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7664 Date: Wed, 29 Jan 2014 20:59:47 GMT (3380kb) Title: Indirect Detection Signatures for the Origin of Asymmetric Dark Matter Authors: Yue Zhao, Kathryn M. Zurek Categories: hep-ph astro-ph.HE Report-no: MCTP-14-02 \\ We study the decay signatures of Asymmetric Dark Matter (ADM) via higher dimension operators which are responsible for generating the primordial dark matter (DM) asymmetry. Since the signatures are sensitive both to the nature of the higher dimension operator generating the DM asymmetry and to the sign of the baryon or lepton number that the DM carries, indirect detection may provide a window into the nature of the mechanism which generates the DM asymmetry. We consider in particular dimension-6 fermionic operators of the form ${\cal O}_{ADM} = X {\cal O}_{B-L}/M^2$, where ${\cal O}_{B-L} = u^c d^c d^c,~\ell \ell e^c,~q \ell d^c$ (or operators related through a Hermitian conjugate) with the scale $M$ around or just below the GUT scale. We derive constraints on ADM particles both in the natural mass range (around a few GeV), as well as in the range between 100 GeV to 10 TeV. For light ADM, we focus on constraints from the low energy gamma ray data from Fermi. For heavy ADM, we consider $\gamma$-rays and proton/anti-proton fluxes, and we fit $e^+/e^-$ data from AMS-02, showing that some ADM models fit the data well while being consistent with the other constraints. We show that, compared to an ordinary symmetric dark matter scenario, the decay of DM with a primordial asymmetry typically reduces the tension between the positron ratio fit and constraints from other channels. \\ ( http://arxiv.org/abs/1401.7664 , 3380kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1401.5765 (*cross-listing*) Date: Wed, 22 Jan 2014 19:47:20 GMT (1167kb,D) Title: Beyond the constant-mass Dirac physics: Solitons, charge fractionization, and the emergence of topological insulators in graphene rings Authors: Constantine Yannouleas, Igor Romanovsky, Uzi Landman Categories: cond-mat.mes-hall hep-ph nucl-th Comments: 6 pages with 3 color figures. Physical Review B, in press. For related papers, see http://www.prism.gatech.edu/~ph274cy/ Journal-ref: Phys. Rev. B 89, 035432 (2014) DOI: 10.1103/PhysRevB.89.035432 \\ The doubly-connected polygonal geometry of planar graphene rings is found to bring forth topological configurations for accessing nontrivial relativistic quantum field (RQF) theory models that carry beyond the constant-mass Dirac-fermion theory. These include generation of sign-alternating masses, solitonic excitations, and charge fractionization. The work integrates a RQF Lagrangian formulation with numerical tight-binding Aharonov-Bohm electronic spectra and the generalized position-dependent-mass Dirac equation. In contrast to armchair graphene rings (aGRGs) with pure metallic arms, certain classes of aGRGs with semiconducting arms, as well as with mixed metallic-semiconducting ones, are shown to exhibit properties of one-dimensional nontrivial topological insulators. This further reveals an alternative direction for realizing a graphene-based nontrivial topological insulator through the manipulation of the honeycomb lattice geometry, without a spin-orbit contribution. \\ ( http://arxiv.org/abs/1401.5765 , 1167kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7298 (*cross-listing*) Date: Tue, 28 Jan 2014 19:09:37 GMT (11kb) Title: Post-inflationary preheating with weak coupling Authors: Igor Rudenok, Yuri Shtanov, Stanislav Vilchinskii Categories: astro-ph.CO gr-qc hep-ph Comments: 13 pages \\ Particle production in the background of an external classical oscillating field is a key process describing the stage of preheating after inflation. For sufficiently strong couplings between the inflaton and matter fields, this process is known to proceed non-perturbatively. Parametric resonance plays crucial role for bosonic fields in this case, and the evolution of the occupation numbers for fermions is non-perturbative as well. In the Minkowski space, parametric resonance for bosons and non-perturbative effects for fermions would still persist even in the case of weak coupling. In particular, the energy density of created bosons would grow exponentially with time. However, the situation is quite different in the expanding universe. We give a simple demonstration how the conditions of the expanding universe, specifically, redshift of the field modes, lead to the usual perturbative expressions for particle production by an oscillating inflaton in the case of weak couplings. The results that we obtain are relevant and fully applicable to the Starobinsky model of inflation. \\ ( http://arxiv.org/abs/1401.7298 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7330 (*cross-listing*) Date: Tue, 28 Jan 2014 21:00:28 GMT (1062kb,D) Title: Sensitivity of CTA to dark matter signals from the Galactic Center Authors: Mathias Pierre, Jennifer M. Siegal-Gaskins, and Pat Scott Categories: astro-ph.HE astro-ph.GA hep-ph Comments: 19 pages, 11 figures \\ (abridged) The Galactic Center is one of the most promising targets for indirect detection of dark matter with gamma rays. We investigate the sensitivity of the upcoming Cherenkov Telescope Array (CTA) to dark matter annihilation and decay in the Galactic Center. As the inner density profile of the Milky Way's dark matter halo is uncertain, we study the impact of the slope of the Galactic density profile, inwards of the Sun, on the prospects for detecting a dark matter signal with CTA. We find that the sensitivity achieved by CTA to annihilation signals is strongly dependent on the inner profile slope, whereas the dependence is more mild in the case of dark matter decay. Surprisingly, we find that the optimal choice of signal and background regions is virtually independent of the assumed density profile. For the fiducial case of a Navarro-Frenk-White profile, we find that CTA will be able to probe annihilation cross sections well below the canonical thermal relic value for dark matter masses from a few tens of GeV up to $\sim 5$ TeV for annihilation to $\tau^{+}\tau^{-}$, and will achieve only a slightly weaker sensitivity for annihilation to $b\bar{b}$ or $\mu^{+}\mu^{-}$. CTA will improve significantly on current sensitivity to annihilation signals for dark matter masses above $\sim 100$ GeV, covering parameter space that is complementary to that probed by searches with the Fermi Large Area Telescope. The interpretation of apparent excesses in the measured cosmic-ray electron and positron spectra as signals of dark matter decay will also be testable with CTA observations of the Galactic Center. We demonstrate that both for annihilation and for decay, including spectral information for hard channels (such as $\mu^{+}\mu^{-}$ and $\tau^{+}\tau^{-}$) leads to enhanced sensitivity for dark matter masses above $m_{\rm DM}\sim 200$ GeV. \\ ( http://arxiv.org/abs/1401.7330 , 1062kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7352 (*cross-listing*) Date: Tue, 28 Jan 2014 22:00:50 GMT (255kb,D) Title: J/psi and Upsilon Polarization in Hadronic Production Processes Authors: Eric Braaten and James Russ Categories: hep-ex hep-ph Comments: 28 pages, 5 figures; prepared for Volume 64 of the Annual Review of Nuclear and Particle Science \\ Both charm and bottom quarks form nonrelativistic bound states analogous to positronium. The J/psi and psi(2S) charmonium states and the first three Upsilon(nS) bottomonium states, all spin-triplet S-wave quarkonium states below open-heavy-flavor thresholds, have relatively large branching ratios to e- e+ or mu- mu+ pairs. In hadron collisions, experiments measuring lepton pairs can determine polarization by using angular correlation techniques. The polarization, in turn, can be related theoretically to the production mechanism for the bound state. This review summarizes experimental studies with proton beams at fixed target and colliding beam accelerators, covering a center-of-mass energy range from 39 to 7000 GeV for nucleon and antiproton targets. Analyses using various polarization frames and spin-quantization axes are described and results compared. A pattern emerges that connects experimental results over the whole energy span. The theoretical implications of the pattern are presented and a set of new measurements is proposed. \\ ( http://arxiv.org/abs/1401.7352 , 255kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7378 (*cross-listing*) Date: Wed, 29 Jan 2014 00:49:37 GMT (23kb) Title: Trace-anomaly driven inflation in $f(T)$ gravity and in minimal massive bigravity Authors: Kazuharu Bamba, Shin'ichi Nojiri and Sergei D. Odintsov Categories: gr-qc astro-ph.CO hep-ph hep-th Comments: 13 pages, no figure \\ We explore trace-anomaly driven inflation in modified gravity. It is explicitly shown that in $T^2$ teleparallel gravity, the de Sitter inflation can occur, although quasi de Sitter inflation happens in $R^2$ gravity. Furthermore, we investigate the influence of the trace anomaly on inflation. It is found that in $f(T)$ gravity, the de Sitter inflation can end because it becomes unstable due to the trace anomaly, whereas also in higher derivative gravity, the de Sitter inflation can be realized and it will be over thanks to the trace anomaly for smaller parameter regions in comparison with those in teleparallelism. The instability of the de Sitter inflation in $T^2$ gravity and $R^2$ gravity (both with taking account of the trace anomaly) is examined. In addition, we study trace-anomaly driven inflation in minimal massive bigravity, where the contribution from the massive graviton acts as negative cosmological constant. It is demonstrated that the de Sitter inflation can occur and continue for long enough duration. \\ ( http://arxiv.org/abs/1401.7378 , 23kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7438 (*cross-listing*) Date: Wed, 29 Jan 2014 09:01:26 GMT (793kb,D) Title: Falsifying Cosmological Constant Authors: Arman Shafieloo Categories: astro-ph.CO hep-ph hep-th Comments: Proceedings of the 9th International Symposium on Cosmology and Particle Astrophysics, Taipei & Hsinchu, Taiwan 13-17 November 2012; 7 pages, 5 figures Journal-ref: Nucl.Phys.Proc.Suppl. 246-247 (2014) 171-177 DOI: 10.1016/j.nuclphysbps.2013.10.081 \\ One of the main goals of physical cosmology is to reconstruct the expansion history of the universe and finding the actual model of dark energy. In this article I review the difficulties of understanding dark energy and discuss about two strategic approaches, 'reconstructing dark energy' and 'falsifying dark energy models'. While one can use the data to reconstruct the expansion history of the universe and the properties of dark energy using novel approaches, considering the data limitations and its uncertainties we have to deal with cosmographic degeneracies that makes it difficult to distinguish between different dark energy models. On the other hand one can use the power of the data to falsify an assumed model using advanced statistical techniques. Within all these issues, focusing on falsification of cosmological constant has a particular importance since finding any significant deviation from $\Lambda$ would result to a break through in theoretical physics, ruling out the standard concordance model of cosmology. \\ ( http://arxiv.org/abs/1401.7438 , 793kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7491 (*cross-listing*) Date: Wed, 29 Jan 2014 12:37:21 GMT (1321kb,D) Title: Observational constraints on dual intermediate inflation Authors: John D. Barrow, Macarena Lagos, Jo\~ao Magueijo Categories: astro-ph.CO gr-qc hep-ph Comments: 9 pages, 9 figures \\ We explore the observational implications of models of intermediate inflation driven by modified dispersion relations, specifically those representing the phenomenon of dimensional reduction in the ultraviolet limit. These models are distinct from the standard ones because they do not require violations of the strong energy condition, and this is reflected in their structure formation properties. We find that they can naturally accommodate deviations from exact scale-invariance. They also make clear predictions for the running of the spectral index and tensor modes, rendering the models straightforwardly falsifiable. We discuss the observational prospects for these models and the implications these may have for quantum gravity scenarios. \\ ( http://arxiv.org/abs/1401.7491 , 1321kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7597 (*cross-listing*) Date: Wed, 29 Jan 2014 17:24:16 GMT (1028kb,D) Title: Constraining Dark Matter-Neutrino Interactions using the CMB and Large-Scale Structure Authors: Ryan J. Wilkinson, Celine Boehm, Julien Lesgourgues Categories: astro-ph.CO hep-ph Comments: 12 pages, 5 figures Report-no: IPPP/14/03, DCPT/14/06, CERN-PH-TH-2014-013, LAPTH-006/14 \\ We present a new study on the elastic scattering cross section of dark matter (DM) and neutrinos using the latest cosmological data from Planck and large-scale structure experiments. We find that the strongest constraints are set by the Lyman-alpha forest, giving sigma_{DM-neutrino} < 10^{-33} (m_DM/GeV) cm^2 if the cross section is constant and a present-day value of sigma_{DM-neutrino} < 10^{-45} (m_DM/GeV) cm^2 if it scales as the temperature squared. These are the most robust limits on DM-neutrino interactions to date, demonstrating that one can use the distribution of matter in the Universe to probe dark ("invisible") interactions. Additionally, we show that scenarios involving thermal MeV DM and a constant elastic scattering cross section naturally predict (i) a cut-off in the matter power spectrum at the Lyman-alpha scale, (ii) N_eff ~ 3.5 +/- 0.4, (iii) H_0 ~ 71 +/- 3 km/s/Mpc and (iv) the possible generation of neutrino masses. \\ ( http://arxiv.org/abs/1401.7597 , 1028kb) ------------------------------------------------------------------------------ \\ arXiv:1401.7628 (*cross-listing*) Date: Wed, 29 Jan 2014 19:13:25 GMT (174kb,D) Title: Chiral Gravity Waves and Leptogenesis in Inflationary Models with non-Abelian Gauge Fields Authors: Azadeh Maleknejad Categories: hep-th gr-qc hep-ph Comments: 18 pages, 2 figures \\ We present a leptogenesis scenario associated with inflationary models involving non-Abelian gauge fields within the standard model of particle physics (SM). We show that this class of inflationary models generates intrinsic birefringent gravitational waves that through the gravitational chiral anomaly in SM, can naturally create a net lepton number density. The CP violating interaction is produced by tensor fluctuations of the gauge field, while the efficiency of this process is determined by the effective background value of the gauge field. We demonstrate that this mechanism can create the observed value of baryon to photon number density in a natural range of parameters of these models. \\ ( http://arxiv.org/abs/1401.7628 , 174kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1209.1054 replaced with revised version Tue, 28 Jan 2014 22:20:20 GMT (16kb) Title: Symmetric texture-zero mass matrices with eigenvalues quark mass Authors: A. Criollo and R. Noriega-Papaqui Categories: hep-ph math-ph math.MP Comments: 25 pages Report-no: DCP-12-05 \\ ( http://arxiv.org/abs/1209.1054 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1212.6674 replaced with revised version Wed, 29 Jan 2014 20:13:07 GMT (131kb) Title: Compton scattering: from deeply virtual to quasi-real Authors: Andrei V. Belitsky and Dieter Mueller and Yao Ji Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 56 pages, 1 figure, explicit expressions for harmonics added, minor changes, Eqs. (9), (131), and (132) corrected \\ ( http://arxiv.org/abs/1212.6674 , 131kb) ------------------------------------------------------------------------------ \\ arXiv:1302.0423 replaced with revised version Wed, 29 Jan 2014 12:53:22 GMT (2698kb,D) Title: Nonzero |U_e3| from Charged Lepton Corrections and the Atmospheric Neutrino Mixing Angle Authors: David Marzocca, Serguey T. Petcov, Andrea Romanino, Maria C. Sevilla Categories: hep-ph Comments: 35 pages, 10 figures. Version 3: addendum with an update of the results based on global analyses including the 2013 data (pages 31-35) Report-no: SISSA 03/2013/FISI, IFIC/13-03 Journal-ref: JHEP Volume 2013, Number 05, 73 DOI: 10.1007/JHEP05(2013)073 \\ ( http://arxiv.org/abs/1302.0423 , 2698kb) ------------------------------------------------------------------------------ \\ arXiv:1302.4410 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 19:26:34 GMT (344kb,D) Title: Nucleon Excited States in N$_f$=2 lattice QCD Authors: C. Alexandrou (Univ. of Cyprus and The Cyprus Inst.), T. Korzec (Humboldt Univ. zu Berlin), G. Koutsou (The Cyprus Inst.), T. Leontiou (Frederick Univ.) Categories: hep-lat hep-ph nucl-th Comments: Expanded variational basis, version accepted for Phys. Rev. D. 10 pages, 16 figures \\ ( http://arxiv.org/abs/1302.4410 , 344kb) ------------------------------------------------------------------------------ \\ arXiv:1302.7200 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 00:08:33 GMT (35kb) Title: The Born series for $S$-wave quartet $nd$ scattering at small cutoff values Authors: Shung-Ichi Ando (Daegu U.) Categories: nucl-th hep-ph Comments: 12 pages, 12 eps figures, revised version accepted for publication in Few-Body Syst \\ ( http://arxiv.org/abs/1302.7200 , 35kb) ------------------------------------------------------------------------------ \\ arXiv:1303.1084 replaced with revised version Wed, 29 Jan 2014 14:01:48 GMT (67kb,D) Title: Minimal Z' models and the 125 GeV Higgs boson Authors: Lorenzo Basso Categories: hep-ph Comments: 12 pages, 4 figures. Corrected Eq.(8) and according references, affecting only heavy neutrino masses (values half than before). Other results unchanged Report-no: FR-PHENO-2013-002 DOI: 10.1016/j.physletb.2013.07.025 \\ ( http://arxiv.org/abs/1303.1084 , 67kb) ------------------------------------------------------------------------------ \\ arXiv:1304.0386 replaced with revised version Wed, 29 Jan 2014 10:47:33 GMT (96kb,D) Title: Precision vs discovery: a simple benchmark Authors: C\'ecile Caillol, Barbara Clerbaux, Jean-Marie Fr\`ere and Simon Mollet Categories: hep-ph Comments: pdflatex, 8 pages, 4 figs; updated references, added figures presented at IAP-Solvay Workshop "Facing the Scalar Sector", Brussels, May 29-31 -- current version : updated to take into account H2 -> 2 H1 decay Report-no: ULB-TH/13-04 \\ ( http://arxiv.org/abs/1304.0386 , 96kb) ------------------------------------------------------------------------------ \\ arXiv:1304.2433 replaced with revised version Wed, 29 Jan 2014 15:44:48 GMT (235kb) Title: Gravitational waves from the sound of a first order phase transition Authors: Mark Hindmarsh, Stephan J. Huber, Kari Rummukainen, David J. Weir Categories: hep-ph astro-ph.CO Comments: 5 pages, 4 figures; v2: Old Fig. 1 removed for space, error corrected in fluid velocity power spectra normalisation, discussion of source modelling significantly expanded, references added, conclusions unchanged, published in PRL Report-no: HIP-2013-07/TH Journal-ref: Phys. Rev. Lett. 112, 041301 (2014) DOI: 10.1103/PhysRevLett.112.041301 \\ ( http://arxiv.org/abs/1304.2433 , 235kb) ------------------------------------------------------------------------------ \\ arXiv:1305.1769 replaced with revised version Wed, 29 Jan 2014 10:37:51 GMT (57kb,D) Title: The LHC excess of four-lepton events interpreted as Higgs-boson signal: background from Double Drell--Yan process? Authors: Mieczyslaw Witold Krasny, Wieslaw Placzek Categories: hep-ph Comments: 19 pages, 4 figures, Version 2 matches the published version Journal-ref: Acta Physica Polonica B 45 (2014) 71 \\ ( http://arxiv.org/abs/1305.1769 , 57kb) ------------------------------------------------------------------------------ \\ arXiv:1309.6761 replaced with revised version Wed, 29 Jan 2014 10:10:49 GMT (2063kb) Title: Quantization of the QCD string with a helical structure Authors: Sarka Todorova-Nova Categories: hep-ph Comments: 5 pages, 5 figures Journal-ref: Phys. Rev. D 89, 015002 (2014) DOI: 10.1103/PhysRevD.89.015002 \\ ( http://arxiv.org/abs/1309.6761 , 2063kb) ------------------------------------------------------------------------------ \\ arXiv:1310.4751 replaced with revised version Wed, 29 Jan 2014 02:09:12 GMT (244kb) Title: Beauty is more attractive: Particle Production and Moduli trapping with Higher Dimensional Interaction Authors: Seishi Enomoto, Satoshi Iida, Nobuhiro Maekawa, Tomohiro Matsuda Categories: hep-ph Comments: 19 pages, 6 figures, 1 table \\ ( http://arxiv.org/abs/1310.4751 , 244kb) ------------------------------------------------------------------------------ \\ arXiv:1311.0589 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 09:21:26 GMT (12kb) Title: Scheme independent consequence of the NSVZ relation for N=1 SQED with N_f flavors Authors: A.L.Kataev, K.V.Stepanyantz Categories: hep-th hep-ph Comments: 10 pages, v2: 1 reference added, a misprint corrected, accepted for publication in Physics Letters B. arXiv admin note: text overlap with arXiv:1305.7094 \\ ( http://arxiv.org/abs/1311.0589 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1311.0836 replaced with revised version Wed, 29 Jan 2014 16:04:55 GMT (7151kb,D) Title: New Regimes of Stringy (Holographic) Pomeron and High Multiplicity pp and pA Collisions Authors: Edward Shuryak and Ismail Zahed Categories: hep-ph hep-th nucl-th Comments: 29 pages, 15 figures \\ ( http://arxiv.org/abs/1311.0836 , 7151kb) ------------------------------------------------------------------------------ \\ arXiv:1311.1520 replaced with revised version Wed, 29 Jan 2014 16:28:13 GMT (2038kb,D) Title: Are There Hidden Scalars in LHC Higgs Results? Authors: A. Arhrib, P.M. Ferreira and R. Santos Categories: hep-ph Comments: 15 pages, 9 figures. V2: off-shell decays considered, minor changes to comply with referee \\ ( http://arxiv.org/abs/1311.1520 , 2038kb) ------------------------------------------------------------------------------ \\ arXiv:1311.4229 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 06:48:46 GMT (71kb,D) Title: Functional renormalization group approach to conventional theory of superfluidity and beyond Authors: Yuya Tanizaki, Gergely Fej\H{o}s, and Tetsuo Hatsuda Categories: cond-mat.quant-gas cond-mat.supr-con hep-ph nucl-th Comments: 5 pages, 5 figures, to appear in proceedings of XVII. International Conference on Recent Progress in Many-Body Theories (MBT17), some new references are added Report-no: RIKEN-QHP-103 \\ ( http://arxiv.org/abs/1311.4229 , 71kb) ------------------------------------------------------------------------------ \\ arXiv:1312.0832 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 07:05:40 GMT (196kb) Title: Pion properties at finite nuclear density based on in-medium chiral perturbation theory Authors: Soichiro Goda, Daisuke Jido Categories: nucl-th hep-ph Comments: 26 pages, 5 figures \\ ( http://arxiv.org/abs/1312.0832 , 196kb) ------------------------------------------------------------------------------ \\ arXiv:1312.1596 replaced with revised version Wed, 29 Jan 2014 02:17:54 GMT (1455kb) Title: Tomography of exotic hadrons in high-energy exclusive processes Authors: H. Kawamura and S. Kumano Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 12 pages, 11 figures, Phys. Rev. D in press Report-no: KEK-TH-1589, J-PARC-TH-0021 \\ ( http://arxiv.org/abs/1312.1596 , 1455kb) ------------------------------------------------------------------------------ \\ arXiv:1312.7526 (*cross-listing*) replaced with revised version Wed, 29 Jan 2014 08:05:49 GMT (11kb) Title: Non-perturbative renormalization: a new way Authors: G.B. Pivovarov Categories: hep-th hep-ph Comments: 10 pages, no figures \\ ( http://arxiv.org/abs/1312.7526 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1401.3977 replaced with revised version Wed, 29 Jan 2014 06:32:47 GMT (1162kb) Title: The Leptonic CP Phase from Muon Decay at Rest with Two Detectors Authors: Emilio Ciuffoli, Jarah Evslin and Xinmin Zhang Categories: hep-ph hep-ex physics.acc-ph Comments: 5 pages, 14 eps figures, v2 Introduction reorganized \\ ( http://arxiv.org/abs/1401.3977 , 1162kb) ------------------------------------------------------------------------------ \\ arXiv:1401.5944 replaced with revised version Wed, 29 Jan 2014 13:02:19 GMT (26kb) Title: Radiative Symmetry Breaking from Flat Potential in various U(1)' models Authors: Michio Hashimoto, Satoshi Iso, Yuta Orikasa Categories: hep-ph hep-th Comments: 14 pages, 5 figures; references added Report-no: KEK-TH 1700, OU-HET 805 \\ ( http://arxiv.org/abs/1401.5944 , 26kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads