Results 41 to 50 of about 220,545 (228)
Pion damping width from SU(2) x SU(2) NJL model
, 2003 Within the framework of the NJL model, we investigate the modification of the pion damping width in a hot pion gas for temperatures ranging from 0 to 180 MeV. The pion is found to broaden noticeably at T > 60 MeV. Near the chiral phase transition T ~ 180
B. Lenkeit +16 more
core +2 more sources
Meson-baryon sigma terms in QCD Sum Rules
, 2007 We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent ...
Belyaev +45 more
core +1 more source
Phase Transition in Hot Pion Matter [PDF]
, 2000 The equation of state for the pion gas is analyzed within the third virial approximation. The second virial coefficient is found from the pion-pion- scattering data, while the third one is considered as a free parameter.
A. Kostyuk +17 more
core +3 more sources
Coupled channels calculation of a pion-Lambda-nucleon quasibound state
, 2010 We extend the study of a JP=2+, I=3/2 pion-Lambda-nucleon quasibound state [Phys. Rev. D 78, 014013 (2008)] by solving nonrelativistic Faddeev equations, using 3S1-3D1, Lambda N - Sigma N coupled channels Chiral Quark Model local interactions, and pion ...
Gal, Avraham, Garcilazo, Humberto
core +1 more source
Energy dependence of pion in-medium effects on \pi^-/\pi^+ ratio in heavy-ion collisions [PDF]
, 2013 Within the framework of a thermal model with its parameters fitted to the results from an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, we study the pion in-medium effect on the charged-pion ratio in heavy-ion collisions at ...
Chen, Lie-Wen +4 more
core +3 more sources
Neutrino-induced coherent pion production off nuclei reexamined
, 2009 It is pointed out that so far all theoretical estimates of coherent pion production off nuclei induced by neutrinos rely on the 'local approximation' well known in photonuclear physics. The effects of dropping this approximation are discussed.
Federico Sanchez +5 more
core +2 more sources
Chiral Symmetry Restoration and Pion Interaction in Nuclear Matter [PDF]
, 1998 This paper is devoted to the interplay between p-wave, s-wave pion-nucleon/ nucleus interaction and in-medium pion-pion interaction with special emphasis on the role of the nuclear pionic scalar density driving a large amount of chiral symmetry ...
Chanfray, Guy, Davesne, Dany
core +3 more sources
Isospin breaking in the pion-nucleon coupling constant and the nucleon-nucleon scattering length
Ядерна фізика та енергетика, 2016 Charge independence breaking (CIB) in the pion-nucleon coupling constant and the nucleon-nucleon scattering length is considered on the basis of the Yukawa meson theory.
V. A. Babenko, N. M. Petrov
doaj
, 2006 The mean field (MF) approximation for the pion matter, being equivalent to the leading ChPT order, involves no dynamical loops and, if self-consistent, produces finite renormalizations only.
A. Dobado +27 more
core +1 more source
Dispersion relations for hadronic light-by-light scattering and the muon g – 2
EPJ Web of Conferences, 2018 The largest uncertainties in the Standard Model calculation of the anomalous magnetic moment of the muon (g – 2)μ come from hadronic effects, and in a few years the subleading hadronic light-by-light (HLbL) contribution might dominate the theory error ...
Procura Massimiliano +3 more
doaj +1 more source