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Nanjing, China

Segovia J.,Argonne National Laboratory | Chang L.,University of Adelaide | Cloet I.C.,Argonne National Laboratory | Roberts C.D.,Argonne National Laboratory | And 4 more authors.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We exploit a method introduced recently to determine parton distribution amplitudes (PDAs) from minimal information in order to obtain light-quark pseudoscalar and vector meson PDAs from the limited number of moments produced by numerical simulations of lattice-regularised QCD. Within errors, the PDAs of pseudoscalar and vector mesons constituted from the same valence quarks are identical; they are concave functions, whose dilation expresses the strength of dynamical chiral symmetry breaking; and SU(3)-flavour symmetry is broken nonperturbatively at the level of 10%. Notably, the appearance of precision in the lattice moments is misleading. The moments also exhibit material dependence on lattice volume, especially for the pion. Improvements need therefore be made before an accurate, unified picture of the light-front structure of light-quark pseudoscalar and vector mesons is revealed. © 2014. Source


Feng H.,Nanjing Southeast University | Shi S.,Nanjing University | Yin P.,Nanjing University | Zong H.,Nanjing University | Zong H.,Joint Center for Particle
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

In the framework of the truncated Dyson-Schwinger equation for the fermion propagator, we investigate the chiral and fermion number susceptibility at finite temperature and chemical potential in quantum electrodynamics in (2+1) dimensions (QED 3). The critical end point in the phase diagram of QED 3 is identified, and the behavior of these two susceptibilities around the critical end point is highlighted. © 2012 American Physical Society. Source


Zhang S.,Chinese Academy of Sciences | Zhang S.,Joint Center for Particle
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

In this Letter, we have studied the shock wave and discontinuity propagation for relativistic superfluid with spontaneous U(1) symmetry breaking in the framework of hydrodynamics. General features of shock waves are provided, the propagation of discontinuity and the sound modes of shock waves are also presented. The first sound and the second sound are identified as the propagation of discontinuity, and the results are in agreement with earlier theoretical studies. Moreover, a differential equation, called the growth equation, is obtained to describe the decay and growth of the discontinuity propagating along its normal trajectory. The solution is in an integral form and special cases of diverging waves are also discussed. © 2014 The Author. Source


Li H.,Nanjing University | Luo X.-L.,Nanjing University | Jiang Y.,Nanjing University | Zong H.-S.,Nanjing University | Zong H.-S.,Joint Center for Particle
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

In this paper we apply the equation of state (EOS) of QCD at finite chemical potential and zero temperature proposed in H.S. Zong and W.M. Sun to the study of properties of quark star. This EOS contains only one adjustable parameter mD which sets the scale of chiral symmetry breaking (in our calculation we have chosen two values of mD: mD=244MeV and mD=239MeV, which is fitted from the value of fπ and determined by e⊃+e⊃- annihilation experiment, respectively). From this EOS a model of quark star is established by applying the Tolman-Oppenheimer- Volkoff equation under two conditions: with the P(μ=0) term and without the P(μ=0) term. Our results show clearly that the P(μ=0) term is an important quantity in the study of quark star. A comparison between our model and other models of quark star is made. In particular, we have compared our results with the most recent observational data measured using Shapiro delay reported in P.B. Demorest. © 2011 The American Physical Society. Source


Zeng H.-B.,Nanjing University | Fan Z.-Y.,Nanjing University | Zong H.-S.,Nanjing University | Zong H.-S.,Joint Center for Particle
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

A d-wave holographic superconductor in the presence of a constant magnetic field is studied by the perturbation method. We obtain both droplet and triangular vortex lattice solutions. The results are the same as that of an s-wave holographic superconductor. The non-Abelian holographic superconductor with p+ip-wave background in the presence of a magnetic field is also studied. Unlike the d-wave and s-wave models, it is found that the non-Abelian model has only a droplet solution. © 2010 The American Physical Society. Source

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