Yupeng Yan

Covariant kaon dynamics and kaon flow in heavy ion collisions

The influence of the chiral mean field on the

Dynamical net-proton fluctuations near a QCD critical point

K^+

Higher Moment Singularities Explored by Net Proton Non-statistical Fluctuations

transverse flow in heavy ion collisions at SIS energy is investigated within covariant kaon dynamics. For the kaon mesons inside the nuclear medium a quasi-particle picture including scalar and vector fields is adopted and compared to the standard treatment with a static potential. It is confirmed that a Lorentz force from spatial component of the vector field provides an important contribution to the in-medium kaon dynamics and strongly counterbalances the influence of the vector potential on the

Study of baryon octet electromagnetic form factors in perturbative chiral quark model

K^+

QGP flow fluctuations and the characteristics of higher moments

in-plane flow. The FOPI data can be reasonably described using in-medium kaon potentials based on effective chiral models. The information on the in-medium

PACIAE model capability in describing net proton moments

K^+

Comparative study for non-statistical fluctuation of net- proton, baryon, and charge multiplicities

potential extracted from kaon flow is consistent with the knowledge from other sources.

TRANSVERSE MASS SPECTRA AND RAPIDITY DISTRIBUTIONS OF K+ IN NI–NI COLLISIONS AT 1.93 A GeV

We investigate the evolution of the net-proton kurtosis and the kurtosis of the chiral order parameter near the critical point in the model of nonequilibrium chiral fluid dynamics. The order parameter is propagated explicitly and coupled to an expanding fluid of quarks and gluons in order to describe the dynamical situation in a heavy-ion collision. We study the critical region near the critical point on the crossover side. There are two sources of fluctuations: non-critical initial event-by-event fluctuations and critical fluctuations. These fluctuations can be distinguished by comparing a mean-field evolution of averaged thermodynamic quantities with the inclusion of fluctuations at the phase transition. We find that while the initial state fluctuations give rise to flat deviations from statistical fluctuations, critical fluctuations reveal a clear structure of the phase transition. The signals of the critical point in the net-proton and sigma field kurtosis are affected by the nonequilibrium dynamics and the inhomogeneity of the space-time evolution but develop clearly.

Low-lying baryon decays in the 3P0 quark model

We use the non-statistical fluctuation instead of the full one to explore the higher moment singularities of net proton event distributions in the relativistic Au+Au collisions at

SIGMA MESON PRODUCTION IN PROTON-NUCLEUS COLLISIONS

sqrt{s_{NN}}