arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.2941hep-phnucl-th
收藏

核介质中的QCD和切伦科夫胶子效应

QCD in the nuclear medium and effects due to Cherenkov gluons

I. M. Dremin

摘要:

提出了介质中的流体动力学方程。对于匀速运动的色荷,给出了它们的经典最低阶解。对于大于1的核介电常数,它描述了切伦科夫胶子的发射,类似于经典电动力学的结果。核介电常数的实部和虚部的值是从RHIC获得的远离侧喷流周围的双峰结构的实验数据拟合获得的。通过比较RHIC、SPS和宇宙线数据,预测了核介电常数的色散。这对于LHC实验来说是非常重要的。切伦科夫胶子可能是造成在SPS实验中观测到的ρ介子附近双轻子质量谱不对称性的原因。该特征被预测为对于所有共振是共同的。当核的介电常数与颜色有关时,根据介质中量子色动力学的高阶项,可能出现“色彩虹”量子效应。

英文摘要:

The equations of in-medium gluodynamics are proposed. Their classical lowest order solution is explicitly shown for a color charge moving with constant speed. For nuclear permittivity larger than 1 it describes emission of Cherenkov gluons resembling results of classical electrodynamics. The values of the real and imaginary parts of the nuclear permittivity are obtained from the fits to experimental data on the double-humped structure around the away-side jet obtained at RHIC. The dispersion of the nuclear permittivity is predicted by comparing the RHIC, SPS and cosmic ray data. This is important for LHC experiments. Cherenkov gluons may be responsible for the asymmetry of dilepton mass spectra near rho-meson, observed in the SPS experiment with excess in the low-mass wing of the resonance. This feature is predicted to be common for all resonances. The "color rainbow" quantum effect might appear according to higher order terms of in-medium QCD if the nuclear permittivity depends on color.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑