Date: Wed, 30 Jan 13 01:08:52 GMT Subject: hep-lat daily 1 new + 4 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: hep-lat@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Mon 28 Jan 13 21:00:00 GMT to Tue 29 Jan 13 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1301.6971 Date: Tue, 29 Jan 2013 16:26:22 GMT (15kb) Title: Gauge theory of Lorentz group as a source of the dynamical electroweak symmetry breaking Authors: M.A.Zubkov Categories: hep-lat hep-ph Comments: Latex, 9 pages \\ We consider the gauge theory of Lorentz group coupled in a nonminimal way to fermions. We suggest the hypothesis (to be confirmed by the further numerical investigations) that the given theory may exist in the phase with broken chiral symmetry and without confinement. The lattice discretization of the model is described. This unusual strongly coupled theory may appear to be the source of the dynamical electroweak symmetry breaking. Namely, in this theory all existing fermions interact with the $SO(3,1)$ gauge field in the same way. Therefore, in the absence of the other interactions the chiral condensate appears and all fermionic excitations acquire equal masses. Small corrections to the gap equations due to the other interactions may cause the appearance of the observed hierarchy of masses. \\ ( http://arxiv.org/abs/1301.6971 , 15kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1301.6762 (*cross-listing*) Date: Mon, 28 Jan 2013 21:00:07 GMT (156kb) Title: Baryon and meson screening masses Authors: Kun-lun Wang, Yu-xin Liu, Lei Chang, Craig D. Roberts and Sebastian M. Schmidt Categories: nucl-th hep-lat hep-ph nucl-ex Comments: 21 pages, 12 figures, 1 table \\ In a strongly-coupled quark-gluon plasma, collective excitations of gluons and quarks should dominate over the excitation of individual quasi-free gluon and quark modes. To explore this possibility, we computed screening masses for ground-state light-quark mesons and baryons at leading-order in a symmetry-preserving truncation scheme for the Dyson-Schwinger equations using a confining formulation of a contact-interaction at nonzero temperature. Meson screening masses are obtained from Bethe-Salpeter equations; and baryon analogues from a novel construction of the Faddeev equation, which employs an improved quark-exchange approximation in the kernel. Our treatment implements a deconfinement transition that is coincident with chiral symmetry restoration in the chiral limit, when both transitions are second order. Despite deconfinement, in all T=0 bound-state channels, strong correlations persist above the critical temperature, T>T_c; and, in the spectrum defined by the associated screening masses, degeneracy between parity-partner correlations is apparent for T >1.3T_c. Notwithstanding these results, there are reasons (including Golberger-Treiman relations) to suppose that the inertial masses of light-quark bound-states, when they may be defined, vanish at the deconfinement temperature; and that this is a signal of bound-state dissolution. Where a sensible comparison is possible, our predictions are consistent with results from contemporary numerical simulations of lattice-regularised QCD. \\ ( http://arxiv.org/abs/1301.6762 , 156kb) ------------------------------------------------------------------------------ \\ arXiv:1301.6815 (*cross-listing*) Date: Tue, 29 Jan 2013 01:34:23 GMT (243kb) Title: Recent developments in SU(3) covariant baryon chiral perturbation theory Authors: Lisheng Geng Categories: nucl-th hep-lat hep-ph Comments: 22 pages, 9 figures \\ Baryon chiral perturbation theory (BChPT), as an effective field theory of low-energy quantum chromodynamics (QCD), has played and is still playing an important role in our understanding of non-perturbative strong interaction phenomena. In the past two decades, inspired by the rapid progress in lattice QCD simulations and the new experimental campaign to study the strangeness sector of low-energy QCD, many efforts have been made to develop a fully covariant BChPT and to test its validity in all scenarios. These new endeavours have not only deepened our understanding of some long-standing problems, such as the power-counting-breaking problem and the convergence problem, but also resulted in theoretical tools that can be confidently applied to make robust predictions. Particularly, the manifestly covariant BChPT supplemented with the extended-on-mass-shell (EOMS) renormalization scheme has been shown to satisfy all analyticity and symmetry constraints and converge relatively faster compared to its non-relativistic and infrared counterparts. In this article, we provide a brief review of the fully covariant BChPT and its latest applications in the $u$, $d$, and $s$ three-flavor sector. \\ ( http://arxiv.org/abs/1301.6815 , 243kb) ------------------------------------------------------------------------------ \\ arXiv:1301.6861 (*cross-listing*) Date: Tue, 29 Jan 2013 08:14:50 GMT (873kb,D) Title: Chiral expansion of moments of quark distributions Authors: P.E. Shanahan, A.W. Thomas and R.D. Young Categories: nucl-th hep-lat hep-ph Report-no: ADP-13-04/T824 \\ We present formulae for the chiral extrapolation of spin-dependent and spin-independent moments of quark distributions of octet baryons, including loop corrections and counterterms to leading non-analytic order. This analysis allows for isospin breaking, and may be used for the chiral extrapolation of both (2+1)- and (1+1+1)-flavor lattice QCD results. An example of such an application is given, with the extrapolation formulae applied to recent (2 + 1)-flavor QCDSF/UKQCD Collaboration lattice results for the first spin-independent and first two spin-dependent Mellin moments. \\ ( http://arxiv.org/abs/1301.6861 , 873kb) ------------------------------------------------------------------------------ \\ arXiv:1301.6973 (*cross-listing*) Date: Tue, 29 Jan 2013 16:34:39 GMT (53kb) Title: Dispersive representation of the pion vector form factor in $\tau\to\pi\pi\nu_\tau$ decays Authors: D. G\'omez Dumm and P. Roig Categories: hep-ph hep-ex hep-lat Comments: 21 pages, 4 figures Report-no: UAB-FT-725 \\ We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on $\tau^-\to\pi^-\pi^0\nu_\tau$ decays obtained by Belle, leading to a good description of the corresponding spectral function up to a $\pi\pi$ squared invariant mass $s\simeq 1.5$~GeV$^2$. We discuss the effect of isospin corrections, and obtain the values of low energy observables. For larger values of $s$, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents. \\ ( http://arxiv.org/abs/1301.6973 , 53kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1210.2664 (*cross-listing*) replaced with revised version Tue, 29 Jan 2013 11:39:00 GMT (200kb) Title: Color path-integral Monte-Carlo simulations of quark-gluon plasma: Thermodynamic and transport properties Authors: V. S. Filinov, Yu. B. Ivanov, M. Bonitz, V. E. Fortov and P. R. Levashov Categories: nucl-th hep-lat hep-ph Comments: 23 pages, 17 figures, version accepted by Phys. Rev. C, technical problems with file fixed \\ ( http://arxiv.org/abs/1210.2664 , 200kb) ------------------------------------------------------------------------------ \\ arXiv:1211.1896 (*cross-listing*) replaced with revised version Tue, 29 Jan 2013 09:32:52 GMT (1449kb,D) Title: The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era Authors: Andrzej J. Buras, Fulvia De Fazio, Jennifer Girrbach Categories: hep-ph hep-ex hep-lat Comments: 82 pages, 34 figures; new results from LHCb taken into account, references added, conclusions unchanged; v3: two tables in Summary added, accepted for publication in JHEP Report-no: FLAVOUR(267104)-ERC-26; BARI-TH/12-665 \\ ( http://arxiv.org/abs/1211.1896 , 1449kb) ------------------------------------------------------------------------------ \\ arXiv:1212.1353 replaced with revised version Tue, 29 Jan 2013 06:58:02 GMT (1700kb) Title: Properties of the twisted Polyakov loop coupling and the infrared fixed point in the SU(3) gauge theory Authors: Etsuko Itou Categories: hep-lat hep-ph hep-th Comments: 40 pages, 24 figures., comments and references added Report-no: KEK-CP-282 \\ ( http://arxiv.org/abs/1212.1353 , 1700kb) ------------------------------------------------------------------------------ \\ arXiv:1301.3943 replaced with revised version Mon, 28 Jan 2013 21:48:04 GMT (53kb) Title: On the Polyakov loop in 2+1 flavor QCD Authors: A. Bazavov and P. Petreczky Categories: hep-lat Comments: Normalization error in the comparison of the hadron resonance gas model with the lattice results is corrected, the conclusion about the range of validity of the hadron resonance gas model is revised Report-no: BNL-99132-2013-JA \\ ( http://arxiv.org/abs/1301.3943 , 53kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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. 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