Date: Mon, 31 Oct 11 00:07:13 GMT Subject: nucl-th daily 6 new + 4 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Thu 27 Oct 11 20:00:00 GMT to Fri 28 Oct 11 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1110.6213 Date: Thu, 27 Oct 2011 23:00:09 GMT (316kb,D) Title: Bridging the gap by shaking superfluid matter Authors: Mark G. Alford, Sanjay Reddy and Kai Schwenzer Categories: nucl-th Comments: 5 pages, 4 figures \\ In cold compact stars, Cooper pairing between fermions in dense matter leads to the formation of a gap in their excitation spectrum and typically exponentially suppresses transport properties. However, we show here that weak Urca reactions become strongly enhanced and approach their ungapped level when the star undergoes density oscillations of sufficiently large amplitude. We study both the neutrino emissivity and the bulk viscosity due to direct Urca processes in hadronic, hyperonic and quark matter and discuss different superfluid and superconducting pairing patterns. \\ ( http://arxiv.org/abs/1110.6213 , 316kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6219 Date: Thu, 27 Oct 2011 23:57:28 GMT (1003kb) Title: The phase diagram in $T-\mu-N_c$ space Authors: Giorgio Torrieri, Stefano Lottini, Igor Mishustin, Piero Nicolini Categories: nucl-th hep-ph hep-th Comments: Presented at "three days on Quarkyonic island", Wroclow, Poland \\ We examine the phase diagram of hadronic matter when the number of colors, as well as temperature and density, are varied. We show that in this regime several new phase transitions are possible, and we examine issues related to these transitions. \\ ( http://arxiv.org/abs/1110.6219 , 1003kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6295 Date: Fri, 28 Oct 2011 11:07:28 GMT (138kb) Title: Distribution of neutron resonance widths Authors: Hans A. Weidenmueller Categories: nucl-th Comments: 5 pages, 3 figures, conference report \\ Recent data on neutron resonance widths indicate disagreement with the Porter-Thomas distribution (PTD). I discuss the theoretical arguments for the PTD, possible theoretical modifications, and I summarize the experimantal evidence. \\ ( http://arxiv.org/abs/1110.6295 , 138kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6343 Date: Fri, 28 Oct 2011 14:24:33 GMT (562kb) Title: The elusiveness of multifragmentation footprints in 1-GeV proton-nucleus reactions Authors: Davide Mancusi, Alain Boudard, Joseph Cugnon, Jean-Christophe David, Thomas Gorbinet, Sylvie Leray Categories: nucl-th Comments: 38 pages, 20 figures. Submitted to Phys. Rev. C \\ We use the tools of hybrid intranuclear-cascade/nuclear-de-excitation models to evaluate the sensitivity of several physical observables to the inclusion of a multifragmentation stage in the de-excitation chain and assess the need for a multifragmentation model in the quantitative description of p+56Fe and p+136Xe reactions at 1-GeV incident energy. We seek clear signatures of multifragmentation by comparing different state-of-the-art de-excitation models coupled with intranuclear-cascade models and by focusing on discriminating observables such as correlations and fragment longitudinal-velocity distributions. None of the considered observables can be unambiguously interpreted as a multifragmentation footprint. The experimental data are best described as originating from sequential binary decays. However, no de-excitation model can reproduce the experimental longitudinal-velocity distributions from 1-GeV p+136Xe. \\ ( http://arxiv.org/abs/1110.6343 , 562kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6377 Date: Fri, 28 Oct 2011 15:54:37 GMT (28kb) Title: Linear response in infinite nuclear matter as a tool to reveal finite size instabilities Authors: A. Pastore, K. Bennaceur, D. Davesne, J. Meyer Categories: nucl-th Comments: Based on talk presented at 18th Nuclear Physics Workshop "Maria and Pierre Curie", 2011, Kazimierz, Poland \\ Nuclear effective interactions are often modelled by simple analytical expressions such as the Skyrme zero-range force. This effective interaction depends on a limited number of parameters that are usually fitted using experimental data obtained from doubly magic nuclei. It was recently shown that many Skyrme functionals lead to the appearance of instabilities, in particular when symmetries are broken, for example unphysical polarization of odd-even or rotating nuclei. In this article, we show how the formalism of the linear response in infinite nuclear matter can be used to predict and avoid the regions of parameters that are responsible for these unphysical instabilities. \\ ( http://arxiv.org/abs/1110.6377 , 28kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6378 Date: Fri, 28 Oct 2011 15:54:50 GMT (133kb) Title: Exclusive production of pion pairs with large invariant mass in nucleus-nucleus collisions Authors: Mariola Klusek-Gawenda and Antoni Szczurek Categories: nucl-th hep-ph Comments: 6 pages, 5 figures, talk by M. Klusek-Gawenda at Low-x Meeting, June 2011, Santiago de Compostela, Galice, Spain \\ The cross section for exclusive $\pi^+\pi^-$ and $\pi^0\pi^0$ meson pairs production in peripheral ultrarelativistic heavy-ion collisions is calculated at the energy available at the CERN Large Hadron Collider, i.e., $\sqrt{s_{NN}}=3.5$ TeV. The cross section for elementary $\gamma\gamma\to\pi\pi$ process is calculated with the help of the pQCD Brodsky-Lepage approach with the distribution amplitude used recently to describe the pion transition form factor measured by the BaBar Collaboration. \\ ( http://arxiv.org/abs/1110.6378 , 133kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1110.6243 (*cross-listing*) Date: Fri, 28 Oct 2011 04:14:21 GMT (1228kb) Title: Test of CDF dijet anomaly within the standard model Authors: H. Kawamura, S. Kumano, Y. Kurihara Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 11 pages, LaTeX, submitted for publication Report-no: KEK-TH-1493, J-PARC-TH-0001 \\ Dijet anomaly reported by the CDF (Collider Detector at Fermilab) collaboration in 1.96 TeV p-pbar collisions is investigated within the standard model by considering effects of parton distribution functions on various processes: W+dijet, Z+dijet, WW, ZW, and top production. Since the anomalous peak exists in the dijet-mass region of 140 GeV with the p-pbar center-of-mass energy sqrt{s}=1.96 TeV, a relevant momentum fraction x of partons is roughly 0.1. In this x region, recent HERMES semi-inclusive charged-lepton scattering experiment indicated that the strange-quark distribution could be very different from a conventional one, which has been used for many years, based on opposite-sign dimuon measurements in neutrino-induced deep inelastic scattering. We investigated effects of such variations in the strange-quark distribution s(x) on the anomaly. We found that distributions of W+dijets and other process are affected by the strange-quark modifications in wide dijet-mass regions including the 140 GeV one. Since the CDF anomaly was observed in the shoulder region of the dijet-mass distribution, a slight modification of the distribution shape could explain at least partially the CDF excess. Therefore, it is important to consider such effects within the standard model for judging whether the CDF anomaly indicates new physics beyond the standard model. We also show modification effects of the strange-quark distribution in the LHC (Large Hadron Collider) kinematics, where cross sections are sensitive to a smaller-x region of s(x). \\ ( http://arxiv.org/abs/1110.6243 , 1228kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6285 (*cross-listing*) Date: Fri, 28 Oct 2011 10:07:44 GMT (6740kb,D) Title: Improved Maximum Entropy Analysis with an Extended Search Space Authors: Alexander Rothkopf Categories: physics.comp-ph hep-ph nucl-th physics.data-an Comments: 26 pages, 11 figures Report-no: BI-TP-2011/34 \\ We propose an improvement to the implementation of the well established Maximum Entropy Method by taking into account carefully the role of prior information. This involves a departure from Bryan's concept of search space, a change that becomes crucial for the success of the inversion task in case of e.g. small datasets or unreliable prior information. To adequately approach problems where an exponentially damped Kernel is used, we provide an implementation using the C/C++ language that utilizes high precision arithmetic adjustable at runtime. The LBFGS algorithm is included in the code in order to attack problems without the need to resort to any search space restriction. An analysis of mock- as well as lattice QCD data is presented as illustration of the discussed issues. \\ ( http://arxiv.org/abs/1110.6285 , 6740kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6340 (*cross-listing*) Date: Fri, 28 Oct 2011 14:08:40 GMT (218kb) Title: The gluon propagator close to criticality Authors: Axel Maas, Jan M. Pawlowski, Lorenz von Smekal, Daniel Spielmann Categories: hep-lat hep-ph nucl-th Comments: 14 pages, 12 figures, 2 tables \\ The deconfinement phase transition of pure Yang-Mills theory at finite temperature is reflected in the behavior of gauge-fixed gluonic correlation functions. This is one of many examples of how physical information can be extracted from gauge-dependent correlations which is not always obvious. Here, we study the behavior of the Landau-gauge gluon propagator of pure SU(2) across the phase transition in 2+1 and 3+1 dimensions in order to assess to what extend the corresponding critical behavior is reflected in these correlations. We discuss why it should emerge from a continuum perspective and test our expectations in lattice simulations. A comparison with SU(3) furthermore reveals quite clear indications for a sensitivity of the gluon propagator to the order of the transition. \\ ( http://arxiv.org/abs/1110.6340 , 218kb) ------------------------------------------------------------------------------ \\ arXiv:1110.6402 (*cross-listing*) Date: Fri, 28 Oct 2011 17:14:06 GMT (140kb) Title: The eta-photon transition form factor Authors: S. Noguera and S. Scopetta Categories: hep-ph nucl-th Comments: 14 pages, 3 figures \\ The eta-photon transition form factor is evaluated in a formalism based on a phenomenological description at low values of the photon virtuality, and a QCD-based description at high photon virtualities, matching at a scale $Q_{0}^{2}$. The high photon virtuality description makes use of a Distribution Amplitude calculated in the Nambu-Jona-Lasinio model with Pauli-Villars regularization at the matching scale $Q_{0}^{2}$, and QCD evolution from $Q_{0}^{2}$ to higher values of $Q^{2}$. A good description of the available data is obtained. The analysis indicates that the recent data from the BaBar collaboration on pion and eta transition form factor can be well reproduced, if a small contribution of twist three at the matching scale $Q_{0}^{2}$ is included. \\ ( http://arxiv.org/abs/1110.6402 , 140kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1103.3661 (*cross-listing*) replaced with revised version Fri, 28 Oct 2011 14:37:03 GMT (11kb) Title: A periodic table for the excited Nucleon and Delta spectrum in a relativistic chiral quark model Authors: E.M. Tursunov Categories: hep-ph hep-ex nucl-th Comments: 7 pages; text corrected and extended \\ ( http://arxiv.org/abs/1103.3661 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:1107.3988 (*cross-listing*) replaced with revised version Fri, 28 Oct 2011 16:23:25 GMT (1009kb) Title: Unitarized Chiral Perturbation Theory in a finite volume: scalar meson sector Authors: M. D\"oring, U.-G. Mei{\ss}ner, E. Oset, A. Rusetsky Categories: hep-lat hep-ph nucl-th Comments: 15 pages, 17 figures \\ ( http://arxiv.org/abs/1107.3988 , 1009kb) ------------------------------------------------------------------------------ \\ arXiv:1108.0969 (*cross-listing*) replaced with revised version Fri, 28 Oct 2011 01:27:46 GMT (871kb) Title: R$\nu$MDM and Lepton Flavor Violation Authors: Yi Cai, Xiao-Gang He, Michael Ramsey-Musolf, Lu-Hsing Tsai Categories: hep-ph astro-ph.CO hep-ex nucl-ex nucl-th Comments: Latex 18 pages with 7 figures. Discussions added in dark matter section and a few references added \\ ( http://arxiv.org/abs/1108.0969 , 871kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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