用重夸克能量损失检验pQCD与AdS/CFT
pQCD vs. AdS/CFT Tested by Heavy Quark Energy Loss
摘要：
我们用弱耦合pQCD和强耦合AdS/CFT拖曳方法预测了粲夸克和底夸克核的修正因子。pQCD损失的log（pT/M_Q）/pT依赖性和阻力损失的动量独立性导致了R_{AA}预测的不同动量依赖性。通过检验一个新的实验观测值，即粲核与底核修饰因子的双比值，R^{cb}=R^ c_{AA} /R^ b_{AA}，这种差异得到了加强。在LHC中，弱耦合理论预测R^{cb}为1;而强耦合理论预测R^{cb}为2，与pT无关。在RHIC中，由于产生谱更硬，所以差异不太明显，但由于温度较低，阻力公式适用于更高的动量。
英文摘要：
We predict the charm and bottom quark nuclear modification factors using weakly coupled pQCD and strongly coupled AdS/CFT drag methods. The log(pT/M_Q)/pT dependence of pQCD loss and the momentum independence of drag loss lead to different momentum dependencies for the R_{AA} predictions. This difference is enhanced by examining a new experimental observable, the double ratio of charm to bottom nuclear modification factors, R^{cb}=R^c_{AA}/R^b_{AA}. At LHC the weakly coupled theory predicts R^{cb} goes to 1; whereas the strongly coupled theory predicts R^{cb} .2 independent of pT. At RHIC the differences are less dramatic, as the production spectra are harder, but the drag formula is applicable to higher momenta, due to the lower temperature.
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