Baryon stopping and saturation physics in relativistic collisions
Baryon stopping and saturation physics in relativistic collisions
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相对论碰撞中的重子停止和饱和物理
DOI：
10.1103/physrevc.80.054905
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发表时间：
2009
影响因子：
3.1
通讯作者：
G. Wolschin
中科院分区：
文献类型：
--
作者：
Y. Mehtar;G. Wolschin
我们研究了欧洲核子研究中心超级质子同步加速器 (SPS)、BNL 相对论重离子对撞机 (RHIC) 和欧洲核子研究中心大型强子对撞机 (LHC) 在饱和模型中达到的能量下相对论重离子碰撞中的重子输运。在基于小耦合 QCD 的彩色玻璃凝聚框架内推导了分析标度定律。横向动量谱、净重子速度分布及其能量、质量和中心性依赖性都得到了很好的描述。与 $\sqrt{{s}_{\mathit{NN}}}=62.4$ 和 $200$ GeV 处 $\mathrm{Au}+\mathrm{Au}$ 碰撞的 RHIC 数据进行比较，研究了胶子饱和状态的渐进方法，并确定了饱和尺度指数的限制。预测了 LHC 能量 $\sqrt{{s}_{\mathit{NN}}}=5.52$ TeV 时中心 $\mathrm{Pb}+\mathrm{Pb}$ 碰撞的净重子快度谱和平均快度损失。
We investigate baryon transport in relativistic heavy-ion collisions at energies reached at the CERN Super Proton Synchrotron (SPS), BNL Relativistic Heavy-Ion Collider (RHIC), and CERN's Large Hadron Collider (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 dependencies are well described. In comparison with RHIC data in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=62.4$ 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 $\mathrm{Pb}+\mathrm{Pb}$ collisions at LHC energies of $\sqrt{{s}_{\mathit{NN}}}=5.52$ TeV are made.