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arXiv 0907.5444hep-ph
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相对论碰撞中的重子停止和饱和物理

Baryon stopping and saturation physics in relativistic collisions

Yacine Mehtar-Tani, Georg Wolschin

摘要:

本文研究了在CERN超级质子同步加速器、BNL相对论重离子对撞机和CERN大型强子对撞机上达到的相对论重离子碰撞中的重子输运。在基于小耦合QCD的色玻璃凝聚体框架内导出了解析标度律。给出了横动量谱、净重子快度分布及其与能量、质量和中心性的关系。通过与sqrt(sNN)= 62.4GeV和200GeV的Au + Au碰撞的RHIC数据的比较,研究了胶子饱和区的逐渐接近,并确定了饱和标度指数的极限。本文对sqrt(sNN)= 5.52TeV的LHC中心Pb + Pb碰撞的净重子快度谱和平均快度损失进行了预测。

英文摘要:

We investigate baryon transport in relativistic heavy-ion collisions at energies reached at the CERN Super Proton Synchrotron, BNL Relativistic Heavy-Ion Collider (RHIC), and CERN LHC in the model of saturation. An analytical scaling law is derived within the color glass condensate framework based on small-coupling QCD. Transverse momentum spectra, net-baryon rapidity distributions and their energy, mass and centrality dependences are well described. In a comparison with RHIC data in Au + Au collisions at sqrt (s_NN) = 62.4 GeV and 200 GeV, the gradual approach to the gluon saturation regime is investigated, and limits for the saturation-scale exponent are determined. Predictions for net-baryon rapidity spectra and the mean rapidity loss in central Pb + Pb collisions at LHC energies of sqrt (s_NN) = 5.52 TeV are made.

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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