LHC能区相对论重离子碰撞中的双轻子产生及其信号与背景的研究(英文)

Study of dilepton production and signal/background extraction in relativistic heavy ion interactions at LHC

在微扰QCD框架下,描述了强子-强子(p-p)作用中重夸克cc和bb的产生;基于Glauber模型,考虑核遮蔽效应,推广强子-强子相互作用到核-核(A-A)情况.模拟了LHC能区铅-铅(Pb-Pb)碰撞中重夸克产生和轻子衰变,预言了ALICE向前区域的μ子产生率和双μ不变质量谱,讨论了μ子产物的实验观察效应;建议了一种进行数据分析、抽出μ子对信号和背景产物的物理方案,预言了ALICE实验中关联μ子对的测量精度,解决了ALICE实验中复杂μ子产物的分离技术.

The production of Heavyflavor quark c() and b() in pp collisions is described under PQCD framework, the extrapolation from hadronhadron up to nucleusnucleus collisions is based on Glauber model and taking into account nucleus shadowing effect. We simulate the heavy quark production and their decay to lepton in PbPb collision at LHC. The muon rate and the invariant mass spectrum of dimuons have been predicted in ALICE forward region. The detection effect analysis technique and signal/background extraction of muon pairs are discussed. The measurement precision of correlated muon paires has been predicted in ALICE experiment.