arXiv subjects

Peng-Zhi Xu

Publications and source records attributed to Peng-Zhi Xu.

4 recordsLinked to original sources

arXiv2021

Effect of relaxation time on the squeezed correlations of bosons for evolution sources in relativistic heavy-ion collisions

Squeezed back-to-back correlation (SBBC) of a boson-antiboson pair is sensitive to the time distribution of the particle-emitting source, and the SBBC function for an evolving source is expected to be affected by the relaxation time of the system. In this paper, we investigate the effect of relaxation time on the SBBC function. We put forth a method to calculate the SBBC function with relaxation-time modification for evolving sources. The SBBC functions of $D^0\!{\bar D}^0$ in relativistic heavy-ion collisions are investigated by using a hydrodynamic model. It is found that the relaxation time reduces the amplitudes of the SBBC functions. This change becomes serious for a long relaxation time and large initial relative deviations of the chaotic and squeezed amplitudes from their equilibrium values, respectively, in the temporal steps.

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arXiv2019

Influence of in-medium mass width on Hanbury Brown-Twiss correlation strength

The interactions of particles with medium may lead to a nonzero in-medium mass width of the particles and cause them to have different masses in the medium. In this letter, we investigate the influence of the in-medium mass width on the strength of Hanbury Brown-Twiss (HBT) correlation in high-energy heavy-ion collisions. It is found that the strength decreases with in-medium mass width of identical bosons. This influence are more significant for the boson with heavier mass and decreases with increasing particle momentum.

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arXiv2019

Squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions

We derive the formulas for calculating the squeezed back-to-back correlation (SBBC) between a boson and antiboson with nonzero width produced in relativistic heavy-ion collisions. The SBBCs of $D^0$ and $ϕ$ mesons with finite in-medium widths are studied. We find that the finite width can change the pattern of the SBBC function of $D^0{\bar D}^0$ with respect to mass. However, the SBBC function of $ϕϕ$ is insensitive to the width. In the high-particle-momentum region, the SBBC function of $ϕϕ$ increases with particle momentum rapidly and can exceed that of $D^0{\bar D}^0$ whether the width is nonzero or not.

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arXiv2019

Squeezed back-to-back correlation between bosons and antibosons with different in-medium masses in high-energy heavy-ion collisions

We derive the formulas of the squeezed back-to-back correlation (SBBC) between a boson and antiboson with different in-medium masses in high-energy heavy-ion collisions. The influence of the in-medium mass difference between a boson and antiboson on the SBBC is investigated. We calculate the SBBC functions of $D$-meson pairs for the hydrodynamic sources described by the VISH2+1 code for Au+Au collisions at $\sqrt{s_{NN}} =200$~GeV. Our results indicate that the SBBC strengths of $D^+D^-$ and $D^0{\bar D}^0$ are different if there are charge-dependent in-medium interactions.

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