Date: Wed, 29 Apr 15 00:19:17 GMT Subject: hep-ph daily 22 new + 5 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 Mon 27 Apr 15 20:00:00 GMT to Tue 28 Apr 15 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1504.07237 Date: Mon, 27 Apr 2015 20:00:30 GMT (1921kb,D) Title: Superconducting Detectors for Super Light Dark Matter Authors: Yonit Hochberg, Yue Zhao, Kathryn M. Zurek Categories: hep-ph astro-ph.CO hep-ex Comments: 5 pages, 2 figures \\ We propose and study a new class of of superconducting detectors which are sensitive to O(meV) electron recoils from dark matter-electron scattering. Such devices could detect dark matter as light as the warm dark matter limit, mX > keV. We compute the rate of dark matter scattering off free electrons in a (superconducting) metal, including the relevant Pauli blocking factors. We demonstrate that classes of dark matter consistent with all astrophysical and terrestrial constraints could be detected by such detectors with a moderate size exposure. \\ ( http://arxiv.org/abs/1504.07237 , 1921kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07242 Date: Mon, 27 Apr 2015 20:00:57 GMT (2541kb,AD) Title: An Alternative Formation Model for Antideuterons from Dark Matter Authors: L. A. Dal, A. R. Raklev Categories: hep-ph astro-ph.HE Comments: 19 pages, 15 figures, C++ code with parametrised cross sections can be found in the ancillary folder \\ Antideuterons are a potential messenger for dark matter annihilation or decay in our own galaxy, with very low backgrounds expected from astrophysical processes. The standard coalescence model of antideuteron formation, while simple to implement, is shown to be under considerable strain by recent data from the LHC. We suggest a new empirically based model, with only one free parameter, which is better able to cope with these data, and we explore the consequences of the model for dark matter searches. \\ ( http://arxiv.org/abs/1504.07242 , 2541kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07244 Date: Mon, 27 Apr 2015 20:01:06 GMT (92kb,D) Title: Baryon Number Violation via Majorana Neutrinos in the Early Universe, at the LHC, and Deep Underground Authors: Hooman Davoudiasl, Yue Zhang Categories: hep-ph hep-ex Comments: 5 pages, 3 figures Report-no: CALT-TH-2015-023 \\ We propose and investigate a novel, minimal, and experimentally testable framework for baryogenesis, dubbed dexiogenesis, using baryon number violating effective interactions of right-handed Majorana neutrinos responsible for the seesaw mechanism. The distinct LHC signature of our framework is same-sign top quark final states, possibly originating from displaced vertices. The region of parameters relevant for LHC phenomenology can also yield concomitant signals in nucleon decay experiments. We provide a simple ultraviolet origin for our effective operators, by adding a color-triplet scalar, which could ultimately arise from a grand unified theory. \\ ( http://arxiv.org/abs/1504.07244 , 92kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07263 Date: Mon, 27 Apr 2015 20:10:28 GMT (307kb,D) Title: Gravitational Waves From a Dark (Twin) Phase Transition Authors: Pedro Schwaller Categories: hep-ph Comments: 12 pages, 3 figures Report-no: CERN-PH-TH-2015-093 \\ In this work, we show that a large class of models with a composite dark sector undergo a strong first order phase transition in the early universe, which could lead to a detectable gravitational wave signal. We summarise the basic conditions for a strong first order phase transition for SU(N) dark sectors with n_f flavours, calculate the gravitational wave spectrum and show that, depending on the dark confinement scale, it can be detected at eLISA or in pulsar timing array experiments. The gravitational wave signal provides a unique test of the gravitational interactions of a dark sector, and we discuss the complementarity with conventional searches for new dark sectors. The discussion includes Twin Higgs and SIMP models as well as symmetric and asymmetric composite dark matter scenarios. \\ ( http://arxiv.org/abs/1504.07263 , 307kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07268 Date: Mon, 27 Apr 2015 20:29:42 GMT (535kb,D) Title: From quantum to classical dynamics: Dynamic crossover in the relativistic $O(N)$ model Authors: David Mesterh\'azy, Jan H. Stockemer, Yuya Tanizaki Categories: hep-ph cond-mat.quant-gas cond-mat.stat-mech Comments: 26 pages, 9 figures \\ We investigate the transition from quantum to classical dynamics in the relativistic $O(N)$ vector model using the nonperturbative functional renormalization group in the real-time formalism. In thermal equilibrium, the theory is characterized by two scales, the interaction range for coherent scattering of particles and the mean free path determined by the rate of incoherent collision with excitations in the thermal medium. Their competition determines the renormalization group flow and the effective dynamics of the model. Here we quantify the dynamic properties of the model in terms of the scale-dependent dynamic critical exponent $z$ for arbitrary temperatures and in $2 \leq d \leq 4$ spatial dimensions. \\ ( http://arxiv.org/abs/1504.07268 , 535kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07293 Date: Mon, 27 Apr 2015 22:27:51 GMT (1691kb,D) Title: Long-lived Colored Scalars at the LHC Authors: Alejandro de la Puente and Alejandro Szynkman Categories: hep-ph \\ We study the collider signatures of a long-lived massive colored scalar transforming trivially under the weak interaction and decaying within the inner sections of a detector such as ATLAS or CMS. In our study, we assume that the colored scalar couples at tree-level to a top quark and a stable fermion, possibly arising from a dark sector or from supersymmetric extensions of the Standard Model. After implementing the latest experimental searches for long-lived colored scalars, we observe a region of parameter space consistent with a colored electroweak-singlet scalar with mass between $\sim180-250$ GeV and a lifetime between $0.1-10$ $\text{mm}/c$ together, with a nearly degenerate dark fermion that may be probed at the $\sqrt{s}=13$ TeV LHC. We show that a region of parameter space within our simplified model may naturally arise from the light-stop window regime of supersymmetric extensions of the Standard Model, where a light mostly right-handed stop has a mass slightly larger than the lightest neutralino and decays through a four-body process. \\ ( http://arxiv.org/abs/1504.07293 , 1691kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07346 Date: Tue, 28 Apr 2015 05:17:55 GMT (1246kb) Title: Comparative production of the scalar and tensor mesons in $\gamma\gamma^*(Q^2)\to \eta\pi^0$ reaction Authors: N.N. Achasov, A.V. Kiselev, G.N. Shestakov Categories: hep-ph hep-ex nucl-th Comments: 26 pages, 12 figures \\ The prediction of the cross section $\sigma(\gamma\gamma^*(Q^2)\to \eta\pi^0)$ based on the simultaneous description of the Belle data on the $\gamma\gamma\to \eta\pi^0$ reaction and the KLOE data on the $\phi\to\eta\pi^0\gamma$ decay is presented. \\ ( http://arxiv.org/abs/1504.07346 , 1246kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07415 Date: Tue, 28 Apr 2015 10:38:06 GMT (1344kb) Title: Dark $Z$ Implication for Flavor Physics Authors: Fanrong Xu Categories: hep-ph Comments: 13 pages, 3 figures \\ Dark $Z$/dark photon ($Z'$) is one candidate of dark force carrier, which helps to interpret the properties of dark matter (DM). Other than traditional studies of DM including direct detection, indirect detection and collider simulation, in this work we take flavor physics as a complementary approach to investigate the features of dark matter. We give an exact calculation of the new type of penguin diagram induced by $Z'$ which further modifies the well-known $X, Y, Z$ functions in penguin-box expansion. The measurement of rare decays $B\to K^{(*)}\mu^+\mu^-$ and $B_s\to \mu^+\mu^-$ at LHC, together with direct CP violation $\varepsilon'/\varepsilon$ in $K\to\pi \pi$ as well as $K_L\to\mu^+\mu^-$, are used to determine the parameter space. The size of coupling constant, however, is found to be $\mathcal{O}(1)$ which is much weaker than the known constraints. \\ ( http://arxiv.org/abs/1504.07415 , 1344kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07428 Date: Tue, 28 Apr 2015 11:09:09 GMT (52kb,D) Title: Quarkonium suppression from coherent energy loss in fixed-target experiments using LHC beams Authors: Fran\c{c}ois Arleo, St\'ephane Peign\'e Categories: hep-ph hep-ex nucl-th Comments: 7 pages, 2 figures \\ Quarkonium production in proton-nucleus collisions is a powerful tool to disentangle cold nuclear matter effects. A model based on coherent energy loss is able to explain the available quarkonium suppression data in a broad range of rapidities, from fixed-target to collider energies, suggesting cold energy loss to be the dominant effect in quarkonium suppression in p-A collisions. This could be further tested in a high-energy fixed-target experiment using a proton or nucleus beam. The nuclear modification factors of J/$\psi$ and $\Upsilon$ as a function of rapidity are computed in p-A collisions at $\sqrt{s}=114.6$ GeV, and in p-Pb and Pb-Pb collisions at $\sqrt{s}=72$ GeV. These center-of-mass energies correspond to the collision on fixed-target nuclei of 7 TeV protons and 2.76 TeV lead nuclei available at the LHC. \\ ( http://arxiv.org/abs/1504.07428 , 52kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07480 Date: Tue, 28 Apr 2015 14:05:12 GMT (1297kb,D) Title: Limits and Fits from Simplified Models Authors: Jory Sonneveld Categories: hep-ph Comments: 4 pages, 6 figures. Contribution to the proceedings of the 50th Rencontres de Moriond, Electroweak Session, 14-21 March 2015 \\ An important tool for interpreting LHC searches for new physics are simplified models. They are characterized by a small number of parameters and thus often rely on a simplified description of particle production and decay dynamics. We compare the interpretation of current LHC searches for hadronic jets plus missing energy signatures within simplified models with the interpretation within complete supersymmetric and same-spin models of quark partners. We found that the differences between the mass limits derived from a simplified model and from the complete models are moderate given the current LHC sensitivity. We conclude that simplified models provide a reliable tool to interpret the current hadronic jets plus missing energy searches at the LHC in a more model-independent way. \\ ( http://arxiv.org/abs/1504.07480 , 1297kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07522 Date: Tue, 28 Apr 2015 15:10:31 GMT (1kb) Title: Proceedings of the 2012 European School of High-Energy Physics (ESHEP 2012), La Pommeraye, Anjou, France, 06-19 Jun 2012 Authors: C. Grojean (CERN) and M. Mulders (CERN) Categories: hep-ph Comments: 8 lectures, 296 pages, published as CERN Yellow Report https://cds.cern.ch/record/1406310 Report-no: CERN-2014-008 DOI: 10.5170/CERN-2014-008 \\ The European School of High-Energy Physics is intended to give young physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These proceedings contain lecture notes on the Standard Model of electroweak interactions, quantum chromodynamics, flavour physics, physics beyond the Standard Model, neutrino physics, and cosmology. \\ ( http://arxiv.org/abs/1504.07522 , 1kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07532 Date: Tue, 28 Apr 2015 15:43:07 GMT (676kb,D) Title: Euler-Heisenberg-Weiss action for QCD+QED Authors: Sho Ozaki, Takashi Arai, Koichi Hattori and Kazunori Itakura Categories: hep-ph nucl-th Comments: 33 pages, 10 figures Report-no: KEK-TH-1815, RIKEN-QHP-189, RBRC-1134 \\ We derive an analytic expression for one-loop effective action of QCD+QED at zero and finite temperatures by using the Schwinger's proper time method. The result is a nonlinear effective action not only for electromagnetic and chromo-electromagnetic fields but also the Polyakov loop, and thus reproduces the Euler-Heisenberg action in QED, QCD, and QED+QCD, and also the Weiss potential for the Polyakov loop at finite temperature. As applications of this "Euler-Heisenberg-Weiss" action in QCD+QED, we investigate quark pair productions induced by QCD+QED fields at zero temperature and the Polyakov loop in the presence of strong electromagnetic fields. Quark one-loop contribution to the effective potential of the Polyakov loop explicitly breaks the center symmetry, and is found to be enhanced by the magnetic field, which is consistent with the inverse magnetic catalysis observed in lattice QCD simulation. \\ ( http://arxiv.org/abs/1504.07532 , 676kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07538 Date: Mon, 27 Apr 2015 15:12:08 GMT (6kb) Title: Heavy Quarkonia and Bc Mesons in the Cornall Potential plus Harmonic Potential in the N-dimensional Radial Schrodinger Equation Authors: M. Abu-Shady Categories: hep-ph Comments: 9 pages \\ Heavy Quarkonia and bc Mesons masses are calculated within the framework of N-dimensional radial Schrodinger Equation. The Cornell potential is extended by including the harmonic term potential. The energy eigenvalues and the wave functions are calculated in N-dimensional using the Nikiforov-Uvarov Method. The energy eigenvalues in 3-dimentional can be obtained from the N-dimensional form. The mass of spectra of charmonium, bottomonium, and bc mesons are calculated. A comparison with other theoretical approaches is discussed. The obtained results are in good agreement with experimental data. \\ ( http://arxiv.org/abs/1504.07538 , 6kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07549 Date: Tue, 28 Apr 2015 16:08:47 GMT (338kb) Title: A Short Guide to Flavour Physics and CP Violation Authors: Seung J. Lee and Hugo Ser\^odio Categories: hep-ph Comments: 51 pages, 19 figures, paper submitted for publication in a CERN Yellow Report (YR) \\ We present the invited lectures given at the second Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP), which took place in Puri, India in November 2014. The series of lectures aimed at graduate students in particle experiment/theory, covering the very basics of flavor physics and CP violation, some useful theoretical methods such as OPE and effective field theories, and some selected topics of flavour physics in the era of LHC. \\ ( http://arxiv.org/abs/1504.07549 , 338kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07551 Date: Tue, 28 Apr 2015 16:12:08 GMT (101kb,D) Title: Cosmological Relaxation of the Electroweak Scale Authors: Peter W. Graham, David E. Kaplan, Surjeet Rajendran Categories: hep-ph hep-th Comments: 10 pages, 2 figures \\ A new class of solutions to the electroweak hierarchy problem is presented that does not require either weak scale dynamics or anthropics. Dynamical evolution during the early universe drives the Higgs mass to a value much smaller than the cutoff. The simplest model has the particle content of the standard model plus a QCD axion and an inflation sector. The highest cutoff achieved in any technically natural model is 10^8 GeV. \\ ( http://arxiv.org/abs/1504.07551 , 101kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07552 Date: Tue, 28 Apr 2015 16:13:28 GMT (724kb) Title: Charged-Higgs production in the Two-Higgs-Doublet Model --- the \tau\nu channel Authors: Lorenzo Basso, Per Osland and Giovanni Marco Pruna Categories: hep-ph Comments: 26 pages, 13 figures Report-no: PSI-PR-15-04 \\ We update the allowed parameter space of the CP-violating 2HDM with Type II Yukawa couplings, that survives the current experimental and theoretical constraints on the model. For a representative set of allowed parameter points, we study the production of charged Higgs bosons, both at the LHC at 14 TeV and at a possible future hadronic collider at 30 TeV. Two classes of production mechanisms are considered, "bosonic" (pp\to H^\pm W^\mp X) and "fermionic" (pp \to H^+ \bar t (b) X). After commenting on our previous H^\pm\to W^\pm H_1 investigation, we focus on the tauonic decay mode, H^\pm \to \tau\nu, performing a detailed signal-over-background analysis at the parton level. The increased features provided when considering CP violation, i.e., the extension of the parameter space and the mixing of the would-be CP-odd scalar boson, only marginally increase the discovery prospects, which remain very challenging both when increased luminosities and higher energies are considered. \\ ( http://arxiv.org/abs/1504.07552 , 724kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07560 Date: Tue, 28 Apr 2015 16:35:05 GMT (696kb) Title: Revision of absorption corrections for the $p p \to p p \pi^{+} \pi^{-}$ process Authors: Piotr Lebiedowicz and Antoni Szczurek Categories: hep-ph Comments: 20 pages, 18 figures, 1 table \\ We include new additional absorption corrections into the Lebiedowicz-Szczurek (non-resonant) model for $p p \to p p \pi^+ \pi^-$ or $p \bar p \to p \bar p \pi^+ \pi^-$ processes. They are related to the $\pi N$ nonperturbative interaction in the final state of the reaction. The role of the absorption corrections is quantified for several differential distributions for $\sqrt{s}$ = 0.2, 1.96, 7, and 8 TeV. The new absorption corrections lead to further decrease of the cross section by about a factor of two. They change the shape of some distributions ($d \sigma/dt$, $d \sigma/dp_{t,p}$, $d \sigma/d \phi_{pp}$) but leave almost unchanged shape of other distributions ($d \sigma/dM_{\pi \pi}$, $d \sigma/dy_{\pi}$, $d \sigma /dp_{t,\pi}$, $d \sigma/d \phi_{\pi \pi}$). The effect may have important impact on the interpretation of the recent STAR and CDF data as well as the forthcoming data of the ALICE, ATLAS + ALFA and CMS + TOTEM collaborations. \\ ( http://arxiv.org/abs/1504.07560 , 696kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07574 Date: Tue, 28 Apr 2015 17:15:58 GMT (475kb) Title: Electroweak corrections to $Z$-boson hadroproduction at finite transverse momentum Authors: W. Hollik, B. A. Kniehl, E. S. Shcherbakova, O. L. Veretin Categories: hep-ph hep-ex Comments: 28 pages, 11 figures Report-no: DESY 14-110, MPP-2015-94 \\ We calculate the full one-loop electroweak radiative corrections, of ${\cal O}(\alpha^2\alpha_s)$, to the cross section of single $Z$-boson inclusive hadroproduction at finite transverse momentum ($p_T$). This includes the ${\cal O}(\alpha)$ corrections to $Z+j$ production, the ${\cal O}(\alpha_s)$ corrections to $Z+\gamma$ production, and certain QCD-electroweak interference contributions involving a single quark trace. We present $p_T$ and rapidity distributions for the experimental conditions at the Fermilab Tevatron and the CERN LHC, and compare the electromagnetic and purely weak corrections with the QCD ones at next-to-leading order. \\ ( http://arxiv.org/abs/1504.07574 , 475kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07585 Date: Tue, 28 Apr 2015 17:59:04 GMT (776kb) Title: Understanding of QCD at high density from Z3-symmetric QCD-like theory Authors: Hiroaki Kouno, Kouji Kashiwa, Junichi Takahashi, Tatsuhiro Misumi, Masanobu Yahiro Categories: hep-ph hep-lat nucl-th Comments: 8 pages, 8 figures Report-no: SAGA-HE-284, YITP-15-35 \\ We investigate QCD at large mu/T by using Z_3-symmetric SU(3) gauge theory, where mu is the quark-number chemical potential and T is temperature. We impose the flavor-dependent twist boundary condition on quarks in QCD. This QCD-like theory has the twist angle theta as a parameter, and agrees with QCD when theta=0 and becomes symmetric when theta=2\pi/3. For both QCD and the Z_3-symmetric SU(3) gauge theory, the phase diagram is drawn in mu--T plane with the Polyakov-loop extended Nambu--Jona-Lasinio model. In the Z_3-symmetric SU(3) gauge theory, the Polyakov loop varphi is zero in the confined phase appearing at T \lsim 200 MeV. The perfectly confined phase never coexists with the color superconducting (CSC) phase, since finite diquark condensate in the CSC phase breaks Z_3 symmetry and then makes varphi finite. When mu \gsim 300 MeV, the CSC phase is more stable than the perfectly confined phase at T \lsim 100 MeV. Meanwhile, the chiral symmetry can be broken in the perfectly confined phase, since the chiral condensate is Z_3 invariant. Consequently, the perfectly confined phase is divided into the perfectly confined phase without chiral symmetry restoration in a region of mu \lsim 300 MeV and T \lsim 200 MeV and the perfectly confined phase with chiral symmetry restoration in a region of \mu \gsim 300 MeV and 100 \lsim T \lsim 200 MeV. The basic phase structure of Z_3-symmetric QCD-like theory remains in QCD. We show that in the perfectly confined phase the sign problem becomes less serious because of \varphi=0, using the heavy quark theory. We discuss a lattice QCD framework to evaluate observables at \theta=0 from those at \theta=2\pi/3. \\ ( http://arxiv.org/abs/1504.07585 , 776kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07608 Date: Tue, 28 Apr 2015 19:28:04 GMT (240kb,D) Title: Enhanced hVV couplings in the Georgi-Machacek model and beyond Authors: Heather E. Logan (Carleton U.) Categories: hep-ph Comments: 6 pages, 2 figures. Talk given at the 2nd Toyama International Workshop on Higgs as a Probe of New Physics 2015, 11-15 February 2015, Toyama, Japan \\ In this talk I discuss extended Higgs sectors in which the 125 GeV Higgs boson couplings to W and Z bosons can be larger than in the Standard Model. Constraints from perturbative unitarity and the electroweak rho parameter limit the number of possible models to a tractable few. Focusing on generalizations of the Georgi-Machacek model and taking advantage of the custodial symmetry, I show that existing experimental and theoretical constraints can be combined to set an upper limit on the enhancement of the Higgs couplings to W and Z bosons. This talk is based mostly on arXiv:1502.01275. \\ ( http://arxiv.org/abs/1504.07608 , 240kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07617 Date: Tue, 28 Apr 2015 19:55:43 GMT (772kb,D) Title: Heavy Higgs Bosons at 14 TeV and 100 TeV Authors: Jan Hajer, Ying-Ying Li, Tao Liu, John F.H. Shiu Categories: hep-ph \\ Searching for Higgs bosons beyond the Standard Model (BSM) is one of the most important missions for hadron colliders. As a landmark of BSM physics, the MSSM Higgs sector at the LHC is expected to be tested up to the scale of the decoupling limit of O(1) TeV, except for a wedge region centered around $\tan\beta \sim 3 -10$, which has been known to be difficult to probe. In this article, we present a dedicated study testing the decoupled MSSM Higgs sector, at the LHC and a next-generation $pp$-collider, proposing to search in channels with associated Higgs productions, with the neutral and charged Higgs further decaying into $tt$ and $tb$, respectively. In the case of neutral Higgs we are able to probe for the so far uncovered wedge region via $pp\to bb H/A \to bbtt$. Additionally, we cover the the high $\tan\beta$ range with $pp\to bb H/A \to bb\tau\tau$. The combination of these searches with channels dedicated to the low $\tan\beta$ region, such as $pp\to H/A \to tt$ and $pp\to tt H/A \to tttt$ potentially covers the full $\tan\beta$ range. The search for charged Higgs has a slightly smaller sensitivity for the moderate $\tan\beta$ region, but additionally probes for the higher and lower $\tan\beta$ regions with even greater sensitivity, via $pp\to tb H^\pm \to tbtb$. While the LHC will be able to probe the whole $\tan\beta$ range for Higgs masses of O(1) TeV by combining these channels, we show that a future 100 TeV $pp$-collider has a potential to push the sensitivity reach up to $\sim \mathcal O(10)$ TeV. In order to deal with the novel kinematics of top quarks produced by heavy Higgs decays, the multivariate Boosted Decision Tree (BDT) method is applied in our collider analyses. The BDT-based tagging efficiencies of both hadronic and leptonic top-jets, and their mutual fake rates as well as the faking rates by other jets ($h$, $Z$, $W$, $b$, etc.) are also presented. \\ ( http://arxiv.org/abs/1504.07617 , 772kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07619 Date: Tue, 28 Apr 2015 19:57:49 GMT (112kb) Title: QCD Kondo effect: quark matter with heavy-flavor impurities Authors: Koichi Hattori, Kazunori Itakura, Sho Ozaki, and Shigehiro Yasui Categories: hep-ph cond-mat.str-el nucl-th Comments: 11 pages, 4 figures Report-no: RBRC-1126, RIKEN-QHP-187, KEK-TH-1814 \\ We show that the Kondo effect occurs in light quark matter which contains heavy quarks as impurities. We consider a scattering between a heavy-flavor impurity and a light quark near a Fermi surface which is mediated by gluon-exchange interactions. We find that the scattering amplitude has a logarithmic infrared divergence originating from imperfect cancellation between quark-impurity and hole-impurity scatterings in a loop integral, implying the presence of a strongly coupled regime near the Fermi surface. Renormalization group method is used to find the Kondo scale where a running coupling constant hits a Landau pole. Following an illustration by a simple contact-interaction model, we examine gluon-exchange interactions on the basis of high density QCD. \\ ( http://arxiv.org/abs/1504.07619 , 112kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1502.06589 (*cross-listing*) Date: Mon, 23 Feb 2015 20:44:33 GMT (6kb) Date (revised v2): Thu, 5 Mar 2015 20:25:37 GMT (7kb) Date (revised v3): Sun, 15 Mar 2015 11:24:42 GMT (7kb) Date (revised v4): Mon, 27 Apr 2015 19:23:17 GMT (8kb) Title: An algorithm for the Baker-Campbell-Hausdorff formula Authors: Marco Matone Categories: math-ph hep-ph hep-th math.MP math.RT quant-ph Comments: 1+8 pages. Comments and refences added. Typos corrected. Version to appear in JHEP \\ A simple algorithm, which exploits the associativity of the BCH formula, and that can be generalized by iteration, extends the remarkable simplification of the Baker-Campbell-Hausdorff (BCH) formula, recently derived by Van-Brunt and Visser. We show that if $[X,Y]=uX+vY+cI$, $[Y,Z]=wY+zZ+dI$, and, consistently with the Jacobi identity, $[X,Z]=mX+nY+pZ+eI$, then $$ \exp(X)\exp(Y)\exp(Z)=\exp({aX+bY+cZ+dI}) $$ where $a$, $b$, $c$ and $d$ are solutions of four equations. In particular, the Van-Brunt and Visser formula $$\exp(X)\exp(Z)=\exp({aX+bZ+c[X,Z]+dI}) $$ extends to cases when $[X,Z]$ contains also elements different from $X$ and $Z$. Such a closed form of the BCH formula may have interesting applications both in mathematics and physics. As an application, we provide the closed form of the BCH formula in the case of the exponentiation of the Virasoro algebra, with ${\rm SL}_2({\rm C})$ following as a subcase. We also determine three-dimensional subalgebras of the Virasoro algebra satisfying the Van-Brunt and Visser condition. It turns out that the exponential form of ${\rm SL}_2({\rm C})$ has a nice representation in terms of its eigenvalues and of the fixed points of the corresponding M\"obius transformation. This may have applications in Uniformization theory and Conformal Field Theories. \\ ( http://arxiv.org/abs/1502.06589 , 8kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07273 (*cross-listing*) Date: Mon, 27 Apr 2015 20:48:48 GMT (1133kb) Title: Constraints on small-scale cosmological fluctuations from SNe lensing dispersion Authors: Ido Ben-Dayan and Ryuichi Takahashi Categories: astro-ph.CO hep-ph hep-th Comments: 11 pages, 9 figures. Submitted to MNRAS Report-no: DESY 15-053 \\ We provide predictions on small-scale cosmological density power spectrum from supernova lensing dispersion. Parameterizing the primordial power spectrum with running $\alpha$ and running of running $\beta$ of the spectral index, we exclude large positive $\alpha$ and $\beta$ parameters which induce too large lensing dispersions over current observational upper bound. We ran cosmological N-body simulations of collisionless dark matter particles to investigate non-linear evolution of the primordial power spectrum with positive running parameters. The initial small-scale enhancement of the power spectrum is largely erased when entering into the non-linear regime. For example, even if the linear power spectrum at $k>10h {\rm Mpc}^{-1}$ is enhanced by $1-2$ orders of magnitude, the enhancement much decreases to a factor of $2-3$ at late time ($z \leq 1.5$). Therefore, the lensing dispersion induced by the dark matter fluctuations weakly constrains the running parameters. When including baryon-cooling effects (which strongly enhance the small-scale clustering), the constraint is comparable or tighter than the PLANCK constraint, depending on the UV cut-off. Further investigations of the non-linear matter spectrum with baryonic processes is needed to reach a firm constraint. \\ ( http://arxiv.org/abs/1504.07273 , 1133kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07402 (*cross-listing*) Date: Tue, 28 Apr 2015 10:00:42 GMT (88kb) Title: Torsional oscillations of nonbare strange stars Authors: Massimo Mannarelli, Giulia Pagliaroli, Alessandro Parisi, Luigi Pilo and Francesco Tonelli Categories: astro-ph.SR hep-ph Comments: 18 pages, 10 figures \\ Strange stars are one of the possible compact stellar objects that can be formed after a supernova collapse. We consider a model of strange star having an inner core in the color-flavor locked phase surmounted by a crystalline color superconducting layer. These two phases constitute the {\it quarksphere}, which we assume to be the largest and heaviest part of the strange star. The next layer consists of standard nuclear matter forming a ionic crust, hovering on the top of the quarksphere and prevented from falling by a strong dipolar electric field. The dipolar electric field arises because quark matter is confined in the quarksphere by the strong interaction, but electrons can leak outside forming a few hundreds Fermi thick electron layer separating the ionic crust from the underlying quark matter. The ionic matter and the crystalline color superconducting matter constitute two electromagnetically coupled crust layers. We study the torsional oscillations of these two layers. Remarkably, we find that if a fraction larger than $10^{-4}$ of the energy of a Vela-like glitch is conveyed to a torsional oscillation, the ionic crust will likely break. The reason is that the very rigid and heavy crystalline color superconducting crust layer will absorb only a small fraction of the glitch energy, leading to a large amplitude torsional oscillation of the ionic crust. \\ ( http://arxiv.org/abs/1504.07402 , 88kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07455 (*cross-listing*) Date: Tue, 28 Apr 2015 12:53:25 GMT (379kb) Title: A Lattice Calculation of Parton Distributions Authors: Constantia Alexandrou, Krzysztof Cichy, Vincent Drach, Elena Garcia-Ramos, Kyriakos Hadjiyiannakou, Karl Jansen, Fernanda Steffens, Christian Wiese Categories: hep-lat hep-ph Comments: 19 pages, 6 figures Report-no: SFB/CPP-14-124, DESY-15-059, CP3-Origins-2015-013 DNRF90, DIAS-2015-13 \\ We report on our exploratory study for the direct evaluation of the parton distribution functions from lattice QCD, based on a recently proposed new approach. We present encouraging results using Nf = 2 + 1 + 1 twisted mass fermions with a pion mass of about 370 MeV. The focus of this work is a detailed description of the computation, including the lattice calculation, the matching to an infinite momentum and the nucleon mass correction. In addition, we test the effect of gauge link smearing in the operator to estimate the influence of the Wilson line renormalization, which is yet to be done. \\ ( http://arxiv.org/abs/1504.07455 , 379kb) ------------------------------------------------------------------------------ \\ arXiv:1504.07535 (*cross-listing*) Date: Tue, 28 Apr 2015 15:49:30 GMT (107kb) Title: Role of $\Lambda(1670)$ in $\gamma p \to K^+ \eta \Lambda $ reaction near threshold Authors: Li-Ye Xiao, Qi-Fang L\"u, Ju-Jun Xie, and Xian-Hui Zhong Categories: nucl-th hep-ph nucl-ex Comments: 6 pages, 4 figures \\ The role of $\Lambda(1670)$ in the $\gamma p \to K^+ \eta \Lambda$ reaction near threshold is studied within an effective Lagrangian approach. We perform a calculation for the total and differential cross section of the $\gamma p \to K^+ \eta \Lambda$ reaction. It is found that $\Lambda(1670)$ caused by $K^-$ meson and $K^{*-}$ vector meson exchanges provides dominant contributions, while the contributions from other processes are small and can be neglected. Thus, this reaction provides a good new place to study $\Lambda(1670)$. \\ ( http://arxiv.org/abs/1504.07535 , 107kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1011.0937 replaced with revised version Tue, 28 Apr 2015 05:46:59 GMT (140kb) Title: PHOTOS Interface in C++; Technical and Physics Documentation Authors: N. Davidson, T. Przedzinski, Z. Was Categories: hep-ph Comments: Updated version; for the program as of April 2015 Report-no: CERN-PH-TH/2010-261, IFJPAN-IV-2010-6 \\ ( http://arxiv.org/abs/1011.0937 , 140kb) ------------------------------------------------------------------------------ \\ arXiv:1202.1288 replaced with revised version Mon, 27 Apr 2015 20:20:15 GMT (37kb) Title: Thermal production of ultrarelativistic right-handed neutrinos: Complete leading-order results Authors: Denis Besak, Dietrich Bodeker (Bielefeld U) Categories: hep-ph astro-ph.CO Comments: 27 pages, 7 figures. Error in the matrix element for the (subdominant) subprocess with s-channel fermion exchange corrected. This changes the corresponding phase space integral and the constant c_V. Numerically it increases the total 2 -> 2 rate by about 2 percent and the complete rate by about 1 percent. The main results and conclusions are unaffected Report-no: BI-TP 2012/05 Journal-ref: JCAP 1203 (2012) 029 \\ ( http://arxiv.org/abs/1202.1288 , 37kb) ------------------------------------------------------------------------------ \\ arXiv:1407.3465 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 08:17:52 GMT (113kb) Title: Photoproduction of the omega meson off the proton near threshold Authors: I.I. Strakovsky, S. Prakhov, Ya.I. Azimov, P. Aguar-Bartolome, J.R.M. Annand, H.J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghaeuser, A. Braghieri, W.J. Briscoe, J. Brudvik, S. Cherepnya, R.F.B. Codling, C. Collicott, S. Costanza, B.T. Demissie, E.J. Downie, P. Drexler, L.V. Fil'kov, D.I. Glazier, R. Gregor, D.J. Hamilton, E. Heid, D. Hornidge, I. Jaegle, O. Jahn, T.C. Jude, V.L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I.J.D. MacGregor, Y. Maghrbi, D.M. Manley, Z. Marinides, J.C. McGeorge, E.F. McNicoll, D. Mekterovic, V. Metag, D.G. Middleton, A. Mushkarenkov, B.M.K. Nefkens, A. Nikolaev, R. Novotny, H. Ortega, M. Ostrick, P.B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M.H. Sikora, A. Starostin, I. Supek, M.F. Taragin, C.M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D.P. Watts, D. Werthmueller, and F. Zehr Categories: nucl-ex hep-ex hep-ph Comments: 5 pages, 3 figures. Published version \\ ( http://arxiv.org/abs/1407.3465 , 113kb) ------------------------------------------------------------------------------ \\ arXiv:1410.1892 replaced with revised version Mon, 27 Apr 2015 22:35:12 GMT (814kb) Title: Introduction to Soft-Collinear Effective Theory Authors: Thomas Becher, Alessandro Broggio and Andrea Ferroglia Categories: hep-ph Comments: 172 pages, 28 figures, 1 table. v2: book version for Lect. Notes Phys Report-no: PSI-PR-14-12 \\ ( http://arxiv.org/abs/1410.1892 , 814kb) ------------------------------------------------------------------------------ \\ arXiv:1411.2634 replaced with revised version Tue, 28 Apr 2015 00:52:43 GMT (293kb,D) Title: Charged mediators in dark matter scattering with nuclei and the strangeness content of nucleons: Strange Brew Authors: Chris Kelso, Jason Kumar, Pearl Sandick and Patrick Stengel Categories: hep-ph Comments: 16 pages, 5 figures; as published in PRD Report-no: UH-511-1239-2014, CETUP2014-004 Journal-ref: Phys. Rev. D 91, 055028 (2015) DOI: 10.1103/PhysRevD.91.055028 \\ ( http://arxiv.org/abs/1411.2634 , 293kb) ------------------------------------------------------------------------------ \\ arXiv:1412.3671 replaced with revised version Tue, 28 Apr 2015 14:07:47 GMT (3697kb,D) Title: Higgs $\to \mu \tau$ in Abelian and Non-Abelian Flavor Symmetry Models Authors: Julian Heeck, Martin Holthausen, Werner Rodejohann, Yusuke Shimizu Categories: hep-ph hep-ex Comments: 33 pages, 11 figures; more references and comments, fewer typos; accepted by NPB Report-no: ULB-TH/14-17 \\ ( http://arxiv.org/abs/1412.3671 , 3697kb) ------------------------------------------------------------------------------ \\ arXiv:1501.03942 replaced with revised version Tue, 28 Apr 2015 13:29:18 GMT (235kb,D) Title: Simplified models for same-spin new physics scenarios Authors: Lisa Edelh\"auser, Michael Kr\"amer, Jory Sonneveld Categories: hep-ph Comments: 11 pages + references, 7 figures; v2: added references, minor improvements in the presentation Report-no: SLAC-PUB-16176, TTK-15-01 Journal-ref: JHEP04(2015)146 DOI: 10.1007/JHEP04(2015)146 \\ ( http://arxiv.org/abs/1501.03942 , 235kb) ------------------------------------------------------------------------------ \\ arXiv:1501.05193 replaced with revised version Tue, 28 Apr 2015 11:16:27 GMT (231kb) Title: Scalar leptoquarks and the rare B meson decays Authors: Suchismita Sahoo, Rukmani Mohanta Categories: hep-ph Comments: 28 pages, 7 figures. typos corrected, to appear in Phys. Rev. D \\ ( http://arxiv.org/abs/1501.05193 , 231kb) ------------------------------------------------------------------------------ \\ arXiv:1501.05307 replaced with revised version Mon, 27 Apr 2015 20:35:44 GMT (1931kb,D) Title: Tasting the SU(5) nature of supersymmetry at the LHC Authors: Sylvain Fichet, Bj\"orn Herrmann, Yannick Stoll Categories: hep-ph Comments: 46 pages, 10 figures, v3: final version to appear in JHEP Report-no: LAPTh-005/15 \\ ( http://arxiv.org/abs/1501.05307 , 1931kb) ------------------------------------------------------------------------------ \\ arXiv:1502.01213 replaced with revised version Tue, 28 Apr 2015 14:04:53 GMT (2063kb) Title: Wbbj production at NLO with POWHEG+MiNLO Authors: Gionata Luisoni, Carlo Oleari, Francesco Tramontano Categories: hep-ph hep-ex Comments: Version as accepted for publication. Added references, one table and one figure. All the rest is the same as version 1 \\ ( http://arxiv.org/abs/1502.01213 , 2063kb) ------------------------------------------------------------------------------ \\ arXiv:1502.05650 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 11:58:57 GMT (84kb,D) Title: Statistical Model of the Early Stage of nucleus-nucleus collisions with exact strangeness conservation Authors: R. V. Poberezhnyuk, M. Gazdzicki, M. I. Gorenstein Categories: nucl-th hep-ph Comments: 13 pages, the data horn plot added \\ ( http://arxiv.org/abs/1502.05650 , 84kb) ------------------------------------------------------------------------------ \\ arXiv:1502.06090 (*cross-listing*) replaced with revised version Mon, 27 Apr 2015 23:18:30 GMT (12kb) Title: Geometrically induced magnetic catalysis and critical dimensions Authors: Antonino Flachi, Kenji Fukushima, Vincenzo Vitagliano Categories: hep-th cond-mat.str-el gr-qc hep-ph Comments: 5 pages; minor changes \\ ( http://arxiv.org/abs/1502.06090 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1502.06872 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 10:52:40 GMT (336kb,D) Title: Astrophysical Probes of the Vainshtein Mechanism: Stars and Galaxies Authors: Kazuya Koyama, Jeremy Sakstein Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 15 pages, 8 figures. Typos corrected, results unchanged \\ ( http://arxiv.org/abs/1502.06872 , 336kb) ------------------------------------------------------------------------------ \\ arXiv:1503.00735 replaced with revised version Tue, 28 Apr 2015 09:19:05 GMT (185kb,D) Title: Two-loop master integrals for non-leptonic heavy-to-heavy decays Authors: Tobias Huber, Susanne Krankl (Siegen U.) Categories: hep-ph Comments: 31 pages, 3 figures. v2: Minor modifications (typos etc.), matches published version Report-no: SI-HEP-2015-09, QFET-2015-10 Journal-ref: JHEP 1504 (2015) 140 \\ ( http://arxiv.org/abs/1503.00735 , 185kb) ------------------------------------------------------------------------------ \\ arXiv:1503.07964 replaced with revised version Mon, 27 Apr 2015 20:48:35 GMT (176kb) Title: Predictions From High Scale Mixing Unification Hypothesis Authors: Rahul Srivastava Categories: hep-ph hep-ex Comments: 10 pages, 8 figures, Typos corrected, Reference added, Results and Conclusions unchanged, Contribution to the proceedings of UNICOS-2014 \\ ( http://arxiv.org/abs/1503.07964 , 176kb) ------------------------------------------------------------------------------ \\ arXiv:1503.08540 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 07:45:06 GMT (106kb,D) Title: Can dark matter induce cosmological evolution of the fundamental constants of Nature? Authors: Y. V. Stadnik, V. V. Flambaum Categories: astro-ph.CO hep-ph hep-th nucl-th physics.atom-ph Comments: 6 pages, 1 figure. New results added. arXiv admin note: text overlap with arXiv:1504.01798 \\ ( http://arxiv.org/abs/1503.08540 , 106kb) ------------------------------------------------------------------------------ \\ arXiv:1504.01487 replaced with revised version Tue, 28 Apr 2015 03:02:26 GMT (2098kb) Title: Statistical Constraints on the Error of the Leptonic CP Violation of Neutrinos Authors: Kai Fu, Ying Zhang Categories: hep-ph Comments: 9 pages, 5 figures \\ ( http://arxiv.org/abs/1504.01487 , 2098kb) ------------------------------------------------------------------------------ \\ arXiv:1504.02529 (*cross-listing*) replaced with revised version Mon, 27 Apr 2015 21:13:12 GMT (171kb) Title: Collective flow without hydrodynamics: simulation results for relativistic ion collisions Authors: Paul Romatschke Categories: nucl-th hep-ph physics.flu-dyn Comments: 16 pages; 7 figures; v2: minor errors corrected, HBT radii added \\ ( http://arxiv.org/abs/1504.02529 , 171kb) ------------------------------------------------------------------------------ \\ arXiv:1504.04276 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 14:54:03 GMT (1848kb,D) Title: AMS-02 antiprotons, at last! Secondary astrophysical component and immediate implications for Dark Matter Authors: Ga\"elle Giesen, Mathieu Boudaud, Yoann Genolini, Vivian Poulin, Marco Cirelli, Pierre Salati, Pasquale D. Serpico Categories: astro-ph.HE hep-ph Comments: 12 pages, 5 figures; small changes, references added Report-no: SACLAY-T13/137, LAPTh-019/15 \\ ( http://arxiv.org/abs/1504.04276 , 1848kb) ------------------------------------------------------------------------------ \\ arXiv:1504.05466 (*cross-listing*) replaced with revised version Tue, 28 Apr 2015 07:59:31 GMT (177kb) Title: Prompt directional detection of galactic supernova by combining large liquid scintillator neutrino detectors Authors: V. Fischer, T. Chirac, T. Lasserre, C. Volpe, M. Cribier, M. Durero, J. Gaffiot, T. Houdy, A. Letourneau, G. Mention, M. Pequignot, V. Sibille, M. Vivier Categories: astro-ph.IM astro-ph.HE hep-ph physics.ins-det Comments: 25 pages, 21 figures, added references, corrected typos and errors in Section 6 \\ ( http://arxiv.org/abs/1504.05466 , 177kb) ------------------------------------------------------------------------------ \\ arXiv:1504.05820 replaced with revised version Tue, 28 Apr 2015 10:37:31 GMT (1527kb,D) Title: How to interpret a discovery or null result of the $0\nu 2\beta$ decay Authors: Zhi-zhong Xing, Zhen-hua Zhao and Ye-Ling Zhou Categories: hep-ph Comments: 13 pages, 6 figures, Figures and references updated \\ ( http://arxiv.org/abs/1504.05820 , 1527kb) ------------------------------------------------------------------------------ \\ arXiv:1504.06490 replaced with revised version Tue, 28 Apr 2015 11:01:55 GMT (523kb) Title: Production of two charm quark-antiquark pairs in single-parton scattering within the $k_t$-factorization approach Authors: Andreas van Hameren, Rafal Maciula and Antoni Szczurek Categories: hep-ph Comments: 14 pages, 12 figures \\ ( http://arxiv.org/abs/1504.06490 , 523kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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/