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arXiv 0908.3344hep-ph
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有限温度和化学势下的双轻子、粲和粲偶素

Dileptons, Charm and Charmonium at Finite Temperature and Chemical Potential

Ralf Rapp

摘要:

我们讨论了如何双轻子,开放的魅力和charmonia可能被利用在重离子碰撞中提取特定的热和致密的物质在有限的夸克化学势,$μ_q$的信息。对于每一个可观察到的,我们简要地讨论了基本的理论框架和解释现有的重离子数据在SPS和RHIC能量的现状。低质量双轻子对$ρ$介子光谱修正中的重子介质效应特别敏感,可以作为火球寿命的精确测量。在开放魅力扇区中,可观测信号可以通过软$σ$模式的$t$信道交换通过散射率的“临界”增强来产生。对于charmonia,有限$T$电位模型可用于外推有限$μ_q$的颜色屏蔽效应,以便于定量评价介质中的解离速率。

英文摘要:

We discuss how dileptons, open charm and charmonia may be utilized in heavy-ion collisions to extract information specific to hot and dense matter at finite quark chemical potential, $μ_q$. For each observable we briefly discuss underlying theoretical frameworks and the current status in interpreting available heavy-ion data at SPS and RHIC energies. Low-mass dileptons are particularly sensitive to baryonic medium effects in spectral modifications of the $ρ$ meson, and may serve as an accurate measure of the fireball lifetime. In the open-charm sector, observable signals may be generated by a ``critical'' enhancement of scattering rates via $t$-channel exchange of a soft $σ$ mode. For charmonia, finite-$T$ potential models could be used to extrapolate color-screening effects to finite $μ_q$ to facilitate a quantitative evaluation of dissociation rates in the medium.

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。

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