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arXiv 0705.0953nucl-ex
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RHIC能量损失的色电荷依赖性研究

Search for color charge dependence of energy loss at RHIC

Bedangadas Mohanty

摘要:

量子色动力学(QCD)的非阿贝尔性质导致高能重离子碰撞形成的介质中胶子比夸克损失更多的能量。与NLO pQCD计算结果相比,p+p碰撞的实验结果表明,在高横动量(pT)下,产生的质子+反质子主要来自胶子喷注,而带电π介子则主要来自夸克喷注。如果将这种情况应用于RHIC中的重离子碰撞,人们会期望夸克和胶子能量损失的差异对测量的可观测量产生影响,例如高pT pbar(p)/pi比和各种粒子的核修改因子。我们讨论了实验结果和一些可能的未来测量。

英文摘要:

The non-Abelian feature of quantum chromodynamics (QCD) results in the gluons losing more energy than quarks in the medium formed in high energy heavy-ion collisions. Experimental results in p+p collisions when compared to NLO pQCD calculations show that at high transverse momentum (pT) the produced protons+anti-protons are dominantly from gluon jets and charged pions have substantial contribution from quark jets. If such a scenario is applied to heavy-ion collisions at RHIC, one would expect the difference in quark and gluon energy loss to have an effect on measured observables, such as high pT pbar(p)/pi ratios and the nuclear modification factor for various particles species. We discuss the experimental results and some possible future measurements.

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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