报告题目： Quark coalescence model for spin alignment and polarization of hadrons

报 告 人：王群 教授, 中国科学技术大学

邀 请 人：梁作堂

报告时间：11月5日（周四），14:00

报告地点：青岛校区第周苑E -122（腾讯会议报告）

报告摘要：

We propose an improved quark coalescence model for spin alignment of vector mesons and polarization of baryons by spin density matrix with phase space dependence. The spin density matrix is defined through Wigner functions. Within the model we propose an understanding of spin alignments of vector mesons φ and K^*0 in the static limit: a large positive deviation of ρ₀₀ for φ mesons from 1/3 may come from the electric part of the vector φ field, while a negative deviation of ρ₀₀ for K^*0 may come from the electric part of vorticity tensor fields. Such a negative contribution to ρ₀₀ for K^*0 mesons, in comparison with the same contribution to ρ₀₀ for φ mesons which is less important, is amplified by a factor of the mass ratio of strange to light quark times the ratio on the wave function of K^*0 to φ (P_b is the relative momentum of two constituent quarks of K^*0 and φ). These results should be tested by a detailed and comprehensive simulation of vorticity tensor fields and vector meson fields in heavy ion collisions.

报告人简介：

  王群，1997年山东大学获得粒子物理与核物理专业的理学博士；2000--2005年在德国法兰克福大学理论物理研究所任洪堡访问学者、访问教授；2005年起任中国科技大学近代物理系教授；2012年获国家杰出青年基金资助。