Date: Thu, 28 Jun 12 00:10:26 GMT Subject: hep-ph daily 18 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 Tue 26 Jun 12 20:00:00 GMT to Wed 27 Jun 12 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1206.6110 Date: Tue, 26 Jun 2012 20:01:18 GMT (68kb) Title: Fourth Generation Parity Authors: Hye-Sung Lee, Amarjit Soni Categories: hep-ph Comments: 5 pages, 2 figures \\ We present a very simple 4th-generation (4G) model with an Abelian gauge interaction under which only the 4G fermions have nonzero charge. The U(1) gauge symmetry can have a Z_2 residual discrete symmetry (4G-parity), which can stabilize the lightest 4G particle (L4P). When the 4G neutrino is the L4P, it would be a neutral and stable particle and the other 4G fermions would decay into the L4P leaving the trace of missing energy plus the standard model fermions. Because of the new symmetry, the 4G particle creation and decay modes are different from those of the sequential 4G model, and the 4G particles can be appreciably lighter than typical experimental bounds. \\ ( http://arxiv.org/abs/1206.6110 , 68kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6115 Date: Tue, 26 Jun 2012 20:16:34 GMT (1341kb) Title: Precision direct photon and W-boson spectra at high p_T and comparison to LHC data Authors: Thomas Becher, Christian Lorentzen and Matthew D. Schwartz Categories: hep-ph Comments: 24 pages, 10 figures \\ The differential p_T spectrum for vector boson production is computed at next-to-leading fixed order and including the resummation of threshold logarithms at next-to-next-to-leading logarithmic accuracy. A comparison is made to ATLAS data on direct photon and W production at high transverse momentum p_T, finding excellent agreement. The resummation is achieved by factorizing contributions associated with different scales using Soft-Collinear Effective Theory. Each part is then calculated pertubatively and the individual contributions are combined using renormalization group methods. A key advantage of the effective theory framework is that it indicates a set of natural scale choices, in contrast to the fixed-order calculation. Resummation of logarithms of ratios of these scales leads to better agreement with data and reduced theoretical uncertainties. \\ ( http://arxiv.org/abs/1206.6115 , 1341kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6123 Date: Tue, 26 Jun 2012 20:55:38 GMT (1381kb) Title: Color-neutral particle production in nucleus-nucleus collisions in the quasi-classical approximation Authors: Tseh Liou Categories: hep-ph nucl-th Comments: 23 pages, 28 figures \\ We use a diagrammatic approach to study color-neutral particle production in nucleus-nucleus collisions in a quasi-classical approximation without small-$x$ evolution. In order to treat the two nuclei symmetrically, we use the Coulomb gauge which gives the appropriate light cone gauge for each nucleus. The resulting cross section is factorized into a product of two Weizs\"{a}cker-Williams gluon distributions of the two nuclei when the transverse momentum of the produced scalar particle is around the saturation momentum. We confirm our results in covariant gauge where the transverse momentum broadening of hard gluons can be described as a diffusion process. The transverse momentum factorization manifests itself in light cone gauge but not so clearly in covariant gauge. \\ ( http://arxiv.org/abs/1206.6123 , 1381kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6138 Date: Tue, 26 Jun 2012 23:07:50 GMT (238kb) Title: Effective SUSY and NPQMSSM after LHC run Authors: Jihn E. Kim Categories: hep-ph Comments: 8 pages with 5 figures. Talk presented at GUT 2012, Kyoto, 15-17 March 2012 \\ Some supersymmetric models after the recent LHC reports are reviewed. This includes the strong CP solution with axions, an extra Z' from GUTs, and the scalar and pseudoscalar Higgs bosons in supersymmetric extension of the standard model. We also comment on the maximal weak CP violation. \\ ( http://arxiv.org/abs/1206.6138 , 238kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6140 Date: Tue, 26 Jun 2012 23:25:30 GMT (686kb) Title: Large, negative threshold contributions to light soft masses in Effective SUSY scenarios Authors: C. Tamarit Categories: hep-ph Comments: 12 pages, 5 figures \\ Thresholds contributions to light scalar soft masses due to heavy sparticles (possibly including a heavy Higgs mostly aligned with H_d) in Effective SUSY scenarios are dominated by two-loop diagrams involving gauge couplings. This is due to the fact that in the limit in which the heavy states are degenerate, their one-loop contributions to the light soft masses only depend on small Yukawa couplings and the hypercharge coupling. The two-loop threshold corrections involving only gauge couplings are calculated for degenerate heavy scalars and shown to be negative, and rather large (\delta m^2_{t,L} ~ -470^2 GeV^2 for heavy sparticles with masses around 10 TeV). The effect on tachyon bounds is revisited with calculations implementing decoupling. It is pointed out that models yielding Effective SUSY spectra using gaugino mediation require in general very heavy gluinos or a very low SUSY breaking scale in order to avoid tachyons (e.g. for heavy squarks at 10 TeV and a SUSY breaking scale of 125 TeV, minimal scenarios require M_3 > 2 TeV at 500 GeV, while nonminimal ones demand M_3 > 8 TeV). \\ ( http://arxiv.org/abs/1206.6140 , 686kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6151 Date: Wed, 27 Jun 2012 00:59:27 GMT (18kb,D) Title: Revisiting $HW\rightarrow\gamma\gamma\ell\nu$ Authors: B. Holdom Categories: hep-ph Comments: 5 pages, 2 figures \\ Evidence is accumulating for a 125 GeV state with loop induced couplings to $gg$ and $\gamma\gamma$. The possibility that this state is a pseudoscalar remains open until tree level couplings to $W$ and $Z$ are confirmed. A small but clean signal of the Higgs coupling to $W$ arises from associated production of a Higgs, with $H\rightarrow\gamma\gamma$. We consider the NLO enhancement of the irreducible background. \\ ( http://arxiv.org/abs/1206.6151 , 18kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6180 Date: Wed, 27 Jun 2012 05:52:49 GMT (12kb) Title: High-Energy Antinucleus-Nucleus Collisions and Extended Multi-Chain Model Authors: Hujio Noda, Shin-Ichi Nakariki, and Tsutomu Tashiro Categories: hep-ph Comments: 16pages, 4 figures \\ High-energy antinucleus-nucleus collisions are studied in the extended multi-chain model. The event probability of inclusive process is calculated by means of the operator matrix in the moment space. Analytic forms for single-particle distribution of inclusive process are derived. \\ ( http://arxiv.org/abs/1206.6180 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6205 Date: Wed, 27 Jun 2012 08:48:30 GMT (846kb,D) Title: Properties of symmetry restoration in the electroweak vacuum in very high magnetic fields Authors: Jos Van Doorsselaere Categories: hep-ph hep-th Comments: 9 pages, 4 figures \\ We discuss properties of the electroweak vacuum as a function of an external magnetic field. The interest in these properties arises due to possible existence of the electromagnetically superconducting phase of QCD in the background of a sufficiently strong magnetic field. The presence of a superconducting vacuum state is known for the electroweak theory with a strong magnetic background and we show how at even higher magnetic fields, the vacuum state is drastically altered. The Higgs condensate vanishes and is replaced with a condensate of vector bosons, taking the form of chromomagnetic vortices in pure Yang-Mills theory. This vector condensate is an exact solution of a Liouville equation and an Abrikosov lattice of vortices can be found, in the form of an exact solution in terms of double periodic Weierstrass functions. We also find that a hypothetical classical interpolating vacuum between the previously known superconducting state and the chromomagnetic vortex lattice would require an exotic vacuum solution, presumably consisting of Alice strings, which are vortices with a fractional winding number. \\ ( http://arxiv.org/abs/1206.6205 , 846kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6215 Date: Wed, 27 Jun 2012 09:38:13 GMT (177kb) Title: Transversity in exclusive electroproduction of pseudoscalar mesons Authors: P. Kroll Categories: hep-ph Comments: 6 pages, 8 figures, using PoS.cls talk presented at QNP2012, Paris (2012) Report-no: Wu B 12-15 \\ In this talk it is reported on an analysis of hard exclusive electroproduction of pseudoscalar mesons within the handbag approach. It is argued that recent measurements of pion electroproduction performed by HERMES and CLAS clearly indicate the occurence of strong contributions from transversely polarized photons. Within the handbag approach such transitions are described by the transversity GPDs accompanied by twist-3 pion wave functions. It is shown that this handbag approach leads to results on cross sections and single-spin asymmetries in fair agreement with experiment. The surprising result is that the pi0 cross section is dominated by gamma_T -> pion transitions. Predictions for other pseudoscalar meson channels are also discussed. \\ ( http://arxiv.org/abs/1206.6215 , 177kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6245 Date: Wed, 27 Jun 2012 12:44:48 GMT (377kb,D) Title: The UTfit Collaboration Average of D meson mixing data: Spring 2012 Authors: UTfit Collaboration: A.J. Bevan, M. Bona, M. Ciuchini, D. Derkach, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, C. Schiavi, L. Silvestrini, V. Sordini, A. Stocchi, C. Tarantino, V. Vagnoni Categories: hep-ph Comments: 5 pages, 3 figures \\ We derive constraints on the parameters $M_{12}$, $\Gamma_{12}$ and $\Phi_{12}$ that describe $D$ meson mixing using all available data, allowing for CP violation. We also provide posterior distributions and predictions for observable parameters appearing in $D$ physics. \\ ( http://arxiv.org/abs/1206.6245 , 377kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6278 Date: Wed, 27 Jun 2012 14:39:28 GMT (424kb) Title: Same-Sign Tetra-Leptons from Type II Seesaw Authors: Eung Jin Chun and Pankaj Sharma Categories: hep-ph hep-ex Comments: 15 pages, 7 figures Report-no: KIAS-P12035 \\ The type II seesaw mechanism introduces a hypercharged Higgs triplet to explain the observed neutrino masses and mixing. Among three triplet components, the doubly charged Higgs boson can be the lightest and decay mainly to same-sign di-leptons. Furthermore, the heavier singly charged or neutral Higgs boson produces a doubly charged Higgs boson through its fast gauge decay. This leads to a novel signature of same-sign tetra-leptons resulting from a pair production of same-sign doubly charged Higgs bosons at colliders. Such a phenomenon can occur in a certain range of the two-dimensional plane of the mass splitting among the triplet components and the triplet vacuum expectation value. After studying production cross-section of the same-sign tetra-lepton signal in this parameter space, we provide a LHC analysis of the predicted events for some benchmark points chosen to maximize the signal events. \\ ( http://arxiv.org/abs/1206.6278 , 424kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6305 Date: Wed, 27 Jun 2012 15:20:26 GMT (67kb) Title: What is the discrete gauge symmetry of the R-parity violating MSSM? Authors: Herbi K. Dreiner, Marja Hanussek, Christoph Luhn Categories: hep-ph Comments: 25 pages Report-no: IPPP-12-40, DCPT-12-80 \\ The lack of experimental evidence for supersymmetry motivates R-parity violating realizations of the MSSM. Dropping R-parity, alternative symmetries have to be imposed in order to stabilize the proton. We determine the possible discrete R and non-R symmetries, which allow for renormalizable R-parity violating terms in the superpotential and which, at the effective level, are consistent with the constraints from nucleon decay. Assuming a gauge origin, we require the symmetry to be discrete gauge anomaly-free, allowing also for cancellation via the Green Schwarz mechanism. Furthermore, we demand lepton number violating neutrino mass terms either at the renormalizable or non-renormalizable level. In order to solve the mu problem, the discrete Z_N or Z_N^R symmetries have to forbid any bilinear superpotential operator at tree level. In the case of renormalizable baryon number violation the smallest possible symmetry satisfying all conditions is a unique hexality Z_6^R. In the case of renormalizable lepton number violation the smallest symmetries are two hexalities, one Z_6 and one Z_6^R. \\ ( http://arxiv.org/abs/1206.6305 , 67kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6311 Date: Wed, 27 Jun 2012 15:30:46 GMT (91kb) Title: Probing NLSP Top Squark from Heavy Gluino at the LHC Authors: Tong Li Categories: hep-ph Comments: 10 pages, 2 figures and 1 table. arXiv admin note: substantial text overlap with arXiv:1112.4461 \\ In this work we explore the 7 TeV LHC implication on light top squark (stop) and investigate discovery limits at both 8 and 14 TeV LHC using same-sign dilepton signature. We consider a simplified spectrum with gluino pair production followed by heavy gluino decay into on-shell stop and top quark in pair. The light stop is then assumed to uniquely decay into c\tilde{\chi}_1^0, bW^+\tilde{\chi}_1^0 or t\tilde{\chi}_1^0. The same-sign dilepton search at 7 TeV LHC places a lower bound of about 800 GeV on the gluino mass in this scenario. We find that the 8 TeV LHC with 30 fb^{-1} luminosity can reach 960 (900) GeV, 1.2 (1.0) TeV and 1.3 (1.1) TeV of gluino mass for stop decay product of c\tilde{\chi}_1^0, bW^+\tilde{\chi}_1^0 and t\tilde{\chi}_1^0 respectively, corresponding to 3 (5) \sigma significance. The discovery limits of heavy gluino mass at the 14 TeV LHC with 100 fb^{-1} luminosity are 1.45 (1.35) TeV, 1.6 (1.55) TeV and 1.9 (1.68) TeV. \\ ( http://arxiv.org/abs/1206.6311 , 91kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6313 Date: Wed, 27 Jun 2012 15:35:48 GMT (16kb) Title: Hunting exotics Authors: Teresa F. Caram\'es, Alfredo Valcarce and Javier Vijande Categories: hep-ph Comments: 5 pages, 1 figure. Proceedings of Science, QNP 2012 \\ In this work we study the $QQ\bar{n}\bar{n}$ systems from both four--quark and meson--meson molecule formalisms, arriving to consistent conclusions when the proper bases are chosen. These states are interesting as they are thought to be found in experiments soon at LHC or RHIC. Such a source of experimental information will significantly improve our current understanding of charm spectroscopy. \\ ( http://arxiv.org/abs/1206.6313 , 16kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6316 Date: Wed, 27 Jun 2012 15:54:20 GMT (1430kb) Title: Status of the Inert Doublet Model and the Role of multileptons at the LHC Authors: Michael Gustafsson, Sara Rydbeck, Laura Lopez-Honorez and Erik Lundstrom Categories: hep-ph Comments: 22 pages, 10 figures and 7 tables Report-no: DESY 11-261, ULB-TH/12-08 \\ A possible feature of the Inert Doublet Model (IDM) is to provide a dark matter candidate together with an alteration of both direct and indirect collider constraints that allow for a heavy Higgs boson. We study the IDM in light of recent results from Higgs searches at the Large Hadron Collider (LHC) in combination with dark matter direct-detection limits from the XENON experiment. We ask under what conditions the IDM can still accommodate a heavy Higgs boson. We find that IDM scenarios with a Higgs boson in the mass range 160 to 600 GeV are ruled out only when all experimental constraints are combined. For models explaining only a fraction of the DM the limits are weakened, and IDMs with a heavy Higgs are allowed. We discuss the prospects for future detection of such IDM scenarios in the four-lepton plus missing energy channel at the LHC. This signal can show up in the first year of running at \sqrt{s} = 14 TeV, and we present detector-level studies for a few benchmark models. \\ ( http://arxiv.org/abs/1206.6316 , 1430kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6342 Date: Wed, 27 Jun 2012 17:27:02 GMT (17kb) Title: An Infinitesimally Superluminal Neutrino is Left-Handed, Conserves Lepton Number and Solves the Autobahn Paradox (Illustrative Discussion) Authors: U. D. Jentschura and B. J. Wundt Categories: hep-ph Comments: 9 pages; RevTeX; Conference Paper for the First International Conference on Logic and Relativity, Alfred Renyi Institute of Mathematics, September 2012, Budapest, Hungary \\ Consider a gedanken experiment in which a massive left-handed neutrino, traveling on an autobahn at a speed of v=0.999c is overtaken by a tuned-up Cagiva V-Raptor 1000 traveling at a speed of 0.999999c. The biker, looking back, would see a right-handed neutrino. Unless one invokes exotic mechanisms like a sterile neutrino, this "autobahn paradox" implies that a massive subluminal (tardyonic) neutrino necessarily has to be a Majorana particle, i.e, equal to its own antiparticle. In turn, this would require us to assign the same lepton number to charged leptons and antileptons, essentially voiding the concept of lepton number. By contrast, an infinitesimally superluminal (tachyonic) neutrino is not equal to its own antiparticle and allows us to assign proper lepton number, just as if the neutrino were a Weyl particle. Furthermore, if Lorentz symmetry holds, then an infinitesimally tachyonic neutrino remains superluminal upon Lorentz transformation, which implies that it is impossible to overtake it in a gedanken experiment. Consistently, right-handed neutrino and left-handed antineutrino states have recently been shown to acquire negative norm under the assumption of an ever-so-slightly tachyonic neutrino, and it would thus not be necessary to invoke a seesaw mechanism. An infinitesimally superluminal neutrino does not necessarily violate causality, as has been discussed in the literature. This paper is devoted to an illustrative discussion of related questions. Under certain conditions, an infinitesimally superluminal neutrino could appear to solve at least as many problems as it raises. \\ ( http://arxiv.org/abs/1206.6342 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6362 Date: Wed, 27 Jun 2012 18:39:17 GMT (12kb) Title: An $S_3$ Model for Lepton Mass Matrices with Nearly Minimal Texture Authors: A. G. Dias, A. C. B. Machado, C. C. Nishi Categories: hep-ph Comments: 8pp \\ We propose a simple extension of the electroweak standard model based on the discrete $S_3$ symmetry that is capable of realizing a nearly minimal Fritzsch-type texture for both the Dirac mass matrices of charged leptons and neutrinos. This is achieved with aid of two additional $Z_3$ symmetries, one of which can be embedded in $U(1)_{B-L}$. Four complex scalar singlet fields are introduced in addition to the SM with righthanded neutrinos. Although more general, the modified texture of the model retains the successful features of the minimal texture without fine-tuning, namely, it accommodates the masses and mixing of the leptonic sector and relates the emergence of large leptonic mixing angles with the seesaw mechanism. An analysis of deviations from the minimal texture ansatz is also presented. \\ ( http://arxiv.org/abs/1206.6362 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6363 Date: Wed, 27 Jun 2012 18:51:12 GMT (17kb) Title: On the breaking of collinear factorization in QCD Authors: Jeffrey R. Forshaw, Michael H. Seymour, Andrzej Siodmok (University of Manchester) Categories: hep-ph Report-no: MAN/HEP/2012/05 \\ We investigate the breakdown of collinear factorization for non-inclusive observables in hadron-hadron collisions. For pure QCD processes, factorization is violated at the three-loop level and it has a structure identical to that encountered previously in the case of super-leading logarithms. In particular, it is driven by the non-commutation of Coulomb/Glauber gluon exchanges with other soft exchanges. Beyond QCD, factorization may be violated at the two-loop level provided that the hard subprocess contains matrix element contributions with phase differences between different colour topologies. \\ ( http://arxiv.org/abs/1206.6363 , 17kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1206.3581 (*cross-listing*) Date: Fri, 15 Jun 2012 20:03:25 GMT (734kb) Date (revised v2): Mon, 25 Jun 2012 19:06:50 GMT (735kb) Title: On the Temperature Dependence of the Shear Viscosity and Holography Authors: Sera Cremonini, Umut Gursoy and Phillip Szepietowski Categories: hep-th hep-ph nucl-th Comments: references added \\ We examine the structure of the shear viscosity to entropy density ratio eta/s in holographic theories of gravity coupled to a scalar field, in the presence of higher derivative corrections. Thanks to a non-trivial scalar field profile, eta/s in this setup generically runs as a function of temperature. In particular, its temperature behavior is dictated by the shape of the scalar potential and of the scalar couplings to the higher derivative terms. We consider a number of dilatonic setups, but focus mostly on phenomenological models that are QCD-like. We determine the geometric conditions needed to identify local and global minima for eta/s as a function of temperature, which translate to restrictions on the signs and ranges of the higher derivative couplings. Finally, such restrictions lead to an holographic argument for the existence of a global minimum for eta/s in these models, at or above the deconfinement transition. \\ ( http://arxiv.org/abs/1206.3581 , 735kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6117 (*cross-listing*) Date: Tue, 26 Jun 2012 20:23:18 GMT (149kb,D) Title: Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton Authors: Neil Barnaby, Jordan Moxon, Ryo Namba, Marco Peloso, Gary Shiu, Peng Zhou Categories: astro-ph.CO gr-qc hep-ph hep-th Report-no: UMN-TH-3107/12; MAD-TH-12-05 \\ We study the possibility that particle production during inflation could source observable gravity waves on scales relevant for Cosmic Microwave Background experiments. A crucial constraint on such scenarios arises because particle production can also source inflaton perturbations, and might ruin the usual predictions for a nearly scale invariant spectrum of nearly Gaussian curvature fluctuations. To minimize this effect, we consider two models of particle production in a sector that is only gravitationally coupled to the inflaton. For a single instantaneous burst of massive particle production, we find that localized features in the scalar spectrum and bispectrum might be observable, but gravitational wave signatures are unlikely to be detectable (due to the suppressed quadrupole moment of non-relativistic quanta) without invoking some additional effects. We also consider a model with a rolling pseudoscalar that leads to a continuous production of relativistic gauge field fluctuations during inflation. Here we find that gravitational waves from particle production can actually exceed the usual inflationary vacuum fluctuations in a regime where non-Gaussianity is consistent with observational limits. In this model observable B-mode polarization can be obtained for any choice of inflaton potential, and the amplitude of the signal is not necessarily correlated with the scale of inflation. \\ ( http://arxiv.org/abs/1206.6117 , 149kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6337 (*cross-listing*) Date: Wed, 27 Jun 2012 17:07:57 GMT (88kb) Title: ABC Resonance Structure in the Double-Pionic Fusion to 4He Authors: P.Adlarson, W.Augustyniak, W. Bardan, M.Bashkanov, T.Bednarski, F.S. Bergmann, M. Berlowski, H. Bhatt, K. T. Brinkmann, M.Buescher, H. Calen, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, K. Grigoryev, C. O. Gullstroem, F. Hauenstein, L. Heijkenskjold, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, C. Husmann, A. Jany, B.R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F.A. Khan, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani, D. Lersch, L. Li, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, H. P. Morsch, P. Moskal, B.K. Nandi, S. Niedzwiecki, H. Ohm, I. Ozerianska, C. Pauly, E. Perez del Rio, Y. Petukhov, P. Plucinski, P. Podkopal, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, A. Pyszniak, C.F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, A. Schmidt, V. Serdyuk, N. Shah, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, G. Sterzenbach, H. Stockhorst, H. Stroeher, A. Szczurek, T. Tolba, A. Trzcinski, R. Varma, P. Vlasov, G.J. Wagner, W. Wkeglorz, M. Wolke, A. Wronska, P. Wuestner, P. Wurm, A.Yamamoto, X. Yuan, L. Yurev, J. Zabierowski, C. Zheng, M.J. Zielinski, W. Zipper, J. Zlomanczuk, P. Zupranski Categories: nucl-ex hep-ex hep-ph \\ Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in the energy range 0.8 - 1.4 GeV covering thus the region of the ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observation in the basic $pn \to d \pi^0\pi^0$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. The maximum occurs at m=2.37 GeV + 2$m_N$, i.e. at the same position as in the basic reaction. The observed resonance width $\Gamma \approx$ 160 MeV can be understood from broadening due to Fermi motion of the nucleons in initial and final nuclei together with collision damping. Differential cross sections are described equally well by the hypothesis of a $pn$ resonance formation during the reaction process. \\ ( http://arxiv.org/abs/1206.6337 , 88kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6355 (*cross-listing*) Date: Wed, 27 Jun 2012 18:06:41 GMT (428kb,D) Title: Measurement of Exclusive $\pi^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs Authors: CLAS Collaboration: I. Bedlinskiy, V. Kubarovsky, S. Niccolai, P. Stoler, K. P. Adhikari, M. Aghasyan, M. J. Amaryan, M. Anghinolfi, H. Avakian, H. Baghdasaryan, J. Ball, N.A. Baltzell, M. Battaglieri, R. P. Bennett, A. S. Biselli, C. Bookwalter, S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, G. Charles, M. Contalbrigo, V. Crede, A. D'Angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, D. Doughty, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, S. Fegan, J. A. Fleming, T. A. Forest, M. Gar\c{c}on, N. Gevorgyan, K.L. Giovanetti, F.X. Girod, W. Gohn, R. W. Gothe, L. Graham, K. A. Griffioen, B. Guegan, M. Guidal, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, D. Heddle, K. Hicks, et al. (93 additional authors not shown) Categories: hep-ex hep-ph nucl-ex Comments: 6 pages, 2 figures \\ Exclusive $\pi^0$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $\phi_\pi$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$,\ $-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $\sigma_T +\epsilon \sigma_L, \sigma_{TT}$ and $\sigma_{LT}$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $\sigma_T +\epsilon \sigma_L$ and fails to account for $\sigma_{TT}$ and $\sigma_{LT}$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $\pi^0$ electroproduction offers direct experimental access to the transversity GPDs. \\ ( http://arxiv.org/abs/1206.6355 , 428kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6379 (*cross-listing*) Date: Wed, 27 Jun 2012 19:57:34 GMT (128kb,D) Title: LieART -- A Mathematica Application for Lie Algebras and Representation Theory Authors: Robert Feger, Thomas W. Kephart Categories: math-ph hep-ph hep-th math.MP Comments: 141 pages 3 figures, 87 tables \\ We present the Mathematica application LieART (Lie Algebras and Representation Theory) for computations frequently encountered in Lie Algebras and representation theory, such as tensor product decomposition and subalgebra branching of irreducible representations. LieART can handle all classical and exceptional Lie algebras. It computes root systems of Lie algebras, weight systems and several other properties of irreducible representations. LieART's user interface has been created with a strong focus on usability and thus allows the input of irreducible representations via their dimensional name, while the output is in the textbook style used in most particle-physics publications. The unique Dynkin labels of irreducible representations are used internally and can also be used for input and output. LieART exploits the Weyl reflection group for most of the calculations, resulting in fast computations and a low memory consumption. Extensive tables of properties, tensor products and branching rules of irreducible representations are included in the appendix. \\ ( http://arxiv.org/abs/1206.6379 , 128kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1006.2066 replaced with revised version Wed, 27 Jun 2012 12:15:46 GMT (231kb) Title: Precision determination of r_0Lambda_MS from the QCD static energy Authors: Nora Brambilla, Xavier Garcia i Tormo, Joan Soto, Antonio Vairo Categories: hep-ph hep-lat Comments: 5 pages, 2 figures. v2: Minor changes. One reference added. Journal version. v3: Mistake in the numerical implementation corrected. v4: Abstract in metadata corrected Report-no: Alberta Thy 04-10; TUM-EFT 8/10; UB-ECM-PF 10/15; ICCUB-10-029 Journal-ref: Phys.Rev.Lett.105:212001,2010 DOI: 10.1103/PhysRevLett.105.212001 \\ ( http://arxiv.org/abs/1006.2066 , 231kb) ------------------------------------------------------------------------------ \\ arXiv:1109.0022 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 14:47:14 GMT (88kb,D) Title: Particle production during inflation and gravitational waves detectable by ground-based interferometers Authors: Jessica L. Cook and Lorenzo Sorbo Categories: astro-ph.CO gr-qc hep-ph hep-th Comments: 13 pages, 2 figures, significant changes in section 3, main conclusions unaffected Journal-ref: J. L.Cook, L. Sorbo, "Particle production during inflation and gravitational waves detectable by ground-based interferometers," Phys. Rev. D85, 023534 (2012) DOI: 10.1103/PhysRevD.85.023534 \\ ( http://arxiv.org/abs/1109.0022 , 88kb) ------------------------------------------------------------------------------ \\ arXiv:1112.2705 replaced with revised version Wed, 27 Jun 2012 19:23:14 GMT (1298kb) Title: LHC Signatures of a Minimal Supersymmetric Hidden Valley Authors: Yuk Fung Chan, Matthew Low, David E. Morrissey and Andrew P. Spray Categories: hep-ph Comments: 46 pages, 21 figures; Updated to journal version Journal-ref: Journal of High Energy Physics, Volume 2012, Number 5 (2012), 155 DOI: 10.1007/JHEP05(2012)155 \\ ( http://arxiv.org/abs/1112.2705 , 1298kb) ------------------------------------------------------------------------------ \\ arXiv:1112.4423 replaced with revised version Wed, 27 Jun 2012 15:31:56 GMT (14kb) Title: Calculation of TMD Evolution for Transverse Single Spin Asymmetry Measurements Authors: S. Mert Aybat, Alexei Prokudin and Ted C. Rogers Categories: hep-ph Comments: 4 pages, 2 figures. Version published in Physical Review Letters Report-no: JLAB-THY-11-1466; NIKHEF-2011-033; YITP-SB-11-48 \\ ( http://arxiv.org/abs/1112.4423 , 14kb) ------------------------------------------------------------------------------ \\ arXiv:1112.5537 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 10:31:26 GMT (33kb) Title: $NN$ scattering in $^3S_1-^3D_1$ channels of EFT ($\not\pi$) Authors: J.-F. Yang (ECNU & KITPC) Categories: nucl-th hep-ph Comments: 27 pages, no figure, 7 tables, revised version \\ ( http://arxiv.org/abs/1112.5537 , 33kb) ------------------------------------------------------------------------------ \\ arXiv:1201.3746 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 10:33:14 GMT (152kb) Title: Renormalization Group Study of Magnetic Catalysis in the 3d Gross-Neveu Model Authors: Daniel D. Scherer, Holger Gies Categories: cond-mat.str-el hep-ph hep-th Comments: 14 pages, 6 figures, typos corrected Journal-ref: Phys. Rev. B 85, 195417 (2012) [13 pages] DOI: 10.1103/PhysRevB.85.195417 \\ ( http://arxiv.org/abs/1201.3746 , 152kb) ------------------------------------------------------------------------------ \\ arXiv:1202.4694 replaced with revised version Wed, 27 Jun 2012 16:41:20 GMT (110kb) Title: Model-independent extraction of $|V_{tq}|$ matrix elements from top-quark measurements at hadron colliders Authors: H. Lacker, A. Menzel, and F. Spettel (CKMfitter group), D. Hirschb\"uhl, J. L\"uck, F. Maltoni, W. Wagner, M. Zaro Categories: hep-ph Comments: 36 pages, 17 figures Report-no: CP3-12-01 Journal-ref: Eur. Phys. J. C (72): 2048 DOI: 10.1140/epjc/s10052-012-2048-4 \\ ( http://arxiv.org/abs/1202.4694 , 110kb) ------------------------------------------------------------------------------ \\ arXiv:1202.5491 replaced with revised version Wed, 27 Jun 2012 18:03:55 GMT (1344kb) Title: Locality in Theory Space Authors: Yonatan Kahn and Jesse Thaler Categories: hep-ph hep-th Comments: 40 pages, 11 figures; v2: references and clarifications added; v3: version accepted by JHEP Report-no: MIT-CTP 4346 \\ ( http://arxiv.org/abs/1202.5491 , 1344kb) ------------------------------------------------------------------------------ \\ arXiv:1203.0931 (*cross-listing*) replaced with revised version Tue, 26 Jun 2012 20:10:24 GMT (447kb,D) Title: Directed flow at midrapidity in sqrt(s_NN)=2.76 TeV Pb+Pb collisions Authors: Ekaterina Retinskaya, Matthew Luzum and Jean-Yves Ollitrault Categories: nucl-th hep-ph nucl-ex Comments: 5 pages. Revised. Estimate of systematic error added (Table 1 and Fig.2). Mistake corrected in the Phobos Monte-Carlo Glauber (Fig.3). Data files included Report-no: Saclay t12/015 Journal-ref: Phys.Rev.Lett.108:252302,2012 DOI: 10.1103/PhysRevLett.108.252302 \\ ( http://arxiv.org/abs/1203.0931 , 447kb) ------------------------------------------------------------------------------ \\ arXiv:1203.4259 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 11:10:48 GMT (379kb) Title: Anisotropic hydrodynamics, holography and the chiral magnetic effect Authors: Ilmar Gahramanov, Tigran Kalaydzhyan and Ingo Kirsch Categories: hep-th hep-ph nucl-th Comments: 13 pages, 5 figures, published version Report-no: DESY 12-042; ZMP-HH/12-4 Journal-ref: Phys. Rev. D 85, 126013 (2012) \\ ( http://arxiv.org/abs/1203.4259 , 379kb) ------------------------------------------------------------------------------ \\ arXiv:1203.6282 replaced with revised version Wed, 27 Jun 2012 13:35:13 GMT (29kb) Title: On top-pair hadro-production at next-to-next-to-leading order Authors: S. Moch (DESY), P. Uwer (Humboldt U., Berlin) and A. Vogt (Liverpool U., Dept. Math.) Categories: hep-ph Comments: 12 pages latex, 2 figures; final version (expanded discussion and additional references) Report-no: DESY 12-049; HU-EP-12/10; LTH 940; LPN 12-042; SFB/CPP-12-16 \\ ( http://arxiv.org/abs/1203.6282 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:1204.0252 replaced with revised version Wed, 27 Jun 2012 17:15:28 GMT (233kb) Title: Non-Minimal Chaotic Inflation, Peccei-Quinn Phase Transition and non-Thermal Leptogenesis Authors: C. Pallis and Q. Shafi Categories: hep-ph astro-ph.CO hep-th Comments: Typos corrected; discussion on the axino and saxion cosmology added; to be published in PRD \\ ( http://arxiv.org/abs/1204.0252 , 233kb) ------------------------------------------------------------------------------ \\ arXiv:1204.1061 replaced with revised version Wed, 27 Jun 2012 05:58:34 GMT (356kb,D) Title: Diphotons from Tetraphotons in the Decay of a 125 GeV Higgs at the LHC Authors: Patrick Draper and David McKeen Categories: hep-ph hep-ex Comments: 14 pages, 7 figures, revtex4-1, v2: references added and rearranged, g-2 limit improved, published version Report-no: SCIPP-12/04 Journal-ref: Phys.Rev.D85:115023,2012 DOI: 10.1103/PhysRevD.85.115023 \\ ( http://arxiv.org/abs/1204.1061 , 356kb) ------------------------------------------------------------------------------ \\ arXiv:1204.1337 replaced with revised version Wed, 27 Jun 2012 18:03:18 GMT (280kb,D) Title: An Attractor for Natural Supersymmetry Authors: Timothy Cohen, Anson Hook, and Gonzalo Torroba Categories: hep-ph hep-th Comments: 21 pages, 4 figures; v2 refs added, title changed to reflect journal version Report-no: SLAC-PUB-14924 \\ ( http://arxiv.org/abs/1204.1337 , 280kb) ------------------------------------------------------------------------------ \\ arXiv:1204.4702 replaced with revised version Wed, 27 Jun 2012 19:24:09 GMT (5kb) Title: Has A 125 GeV Pseudoscalar Resonance Been Observed at the LHC? Authors: J. W. Moffat Categories: hep-ph Comments: 4 pages, no figures, LaTeX file. Revised version. References added \\ ( http://arxiv.org/abs/1204.4702 , 5kb) ------------------------------------------------------------------------------ \\ arXiv:1205.1273 replaced with revised version Wed, 27 Jun 2012 05:40:03 GMT (395kb) Title: Feynman Rules for the Rational Part of One-loop QCD Corrections in the MSSM Authors: Hua-Sheng Shao and Yu-Jie Zhang Categories: hep-ph Comments: version for publication, 50 pages, 6 figures Journal-ref: JHEP06(2012)112 \\ ( http://arxiv.org/abs/1205.1273 , 395kb) ------------------------------------------------------------------------------ \\ arXiv:1205.6284 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 00:52:08 GMT (3612kb) Title: Core-Collapse Supernovae as Supercomputing Science: a status report toward 6D simulations with exact Boltzmann neutrino transport in full general relativity Authors: Kei Kotake, Kohsuke Sumiyoshi, Shoichi Yamada, Tomoya Takiwaki, Takami Kuroda, Yudai Suwa, and Hiroki Nagakura Categories: astro-ph.HE gr-qc hep-ph nucl-th Comments: 41 pages, 21 figures, accepted by Progress of Theoretical and Experimental Physics \\ ( http://arxiv.org/abs/1205.6284 , 3612kb) ------------------------------------------------------------------------------ \\ arXiv:1206.0713 replaced with revised version Wed, 27 Jun 2012 18:09:38 GMT (2787kb,D) Title: Testing Violations of Lorentz Invariance with Cosmic Rays Authors: R. Cowsik, T. Madziwa-Nussinov, S. Nussinov, and U. Sarkar Categories: hep-ph astro-ph.HE Comments: version 2, 28 pages, 10 figures \\ ( http://arxiv.org/abs/1206.0713 , 2787kb) ------------------------------------------------------------------------------ \\ arXiv:1206.1058 replaced with revised version Wed, 27 Jun 2012 12:19:41 GMT (572kb,D) Title: Early Higgs Hints for Non-Minimal Supersymmetry Authors: Aleksandr Azatov, Spencer Chang, Nathaniel Craig, Jamison Galloway Categories: hep-ph Comments: 5 pages, 3 figures; v2: updated fits, minor wording changes, and references added \\ ( http://arxiv.org/abs/1206.1058 , 572kb) ------------------------------------------------------------------------------ \\ arXiv:1206.5028 replaced with revised version Wed, 27 Jun 2012 10:06:26 GMT (2469kb,D) Title: Constrained Exceptional Supersymmetric Standard Model with a Higgs Near 125 GeV Authors: P. Athron, S. F. King, D. J. Miller, S. Moretti and R. Nevzorov Categories: hep-ph Comments: 31 pages, 7 figures, V2 added three references \\ ( http://arxiv.org/abs/1206.5028 , 2469kb) ------------------------------------------------------------------------------ \\ arXiv:1206.5158 replaced with revised version Wed, 27 Jun 2012 08:47:33 GMT (249kb) Title: Direct CP Violation in Charm Decays due to Left-Right Mixing Authors: Chuan-Hung Chen, Chao-Qiang Geng and Wei Wang Categories: hep-ph Comments: 11 pages, 3 figures, references added \\ ( http://arxiv.org/abs/1206.5158 , 249kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6044 replaced with revised version Wed, 27 Jun 2012 16:29:47 GMT (17kb) Title: Dense Quark Matter Conductivity in Ultra-Intense Magnetic Field Authors: B. Kerbikov and M. Andreichikov Categories: hep-ph nucl-th Comments: 3 pages, 0 figures \\ ( http://arxiv.org/abs/1206.6044 , 17kb) ------------------------------------------------------------------------------ \\ arXiv:1206.6096 (*cross-listing*) replaced with revised version Wed, 27 Jun 2012 18:00:51 GMT (7kb) Title: On Determining the Running Coupling from the Effective Action Authors: D. G. C. McKeon and A. Patrushev Categories: hep-th hep-ph Comments: 6+3 pages, typos fixed \\ ( http://arxiv.org/abs/1206.6096 , 7kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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