arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.6329nucl-exhep-ex
收藏

用CERN LHC的ALICE实验对pp和Pb-Pb碰撞中的重味测量

Heavy-flavour measurements in pp and Pb-Pb collisions with the ALICE experiment at the CERN LHC

Ralf Averbeck

摘要:

欧洲核子研究中心大型强子对撞机的ALICE实验首次对sqrt(s)= 7 TeV的pp碰撞和sqrt(s_NN)= 2.76 TeV的Pb-Pb碰撞中的重味强子产生进行了系统的研究。在pp碰撞中,测量了D介子在中快度的微分产生截面,以及电子和μ介子在中快度和正快度的半轻子重味强子衰变中的微分产生截面.这些数据提供了一个重要的测试地面微扰QCD计算在新的大型强子对撞机的能量制度。在Pb-Pb碰撞中,测量了D介子和重味衰变轻子的核修正因子R_AA(p_t),表明在LHC上Pb-Pb碰撞产生的部分子介质中重夸克的能量损失。粲夸克与这种介质的强相互作用也可能产生D介子的非零椭圆流,这是对D^0介子产生的方位角各向异性的首次研究。

英文摘要:

The ALICE experiment at the CERN LHC has conducted first systematic studies of heavy-flavour hadron production in pp collisions at sqrt(s) = 7 TeV and in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. In pp collisions the differential production cross sections of D mesons at mid-rapidity, as well as the cross sections for electrons and muons from semileptonic heavy-flavour hadron decays at mid- and forward-rapidity, respectively, have been measured. These data provide a crucial testing ground for perturbative QCD calculations in the new LHC energy regime. In Pb-Pb collisions, the nuclear modification factor R_AA(p_t) has been measured for D mesons and for leptons from heavy-flavour decays, indicating energy loss of heavy quarks in the partonic medium produced in Pb-Pb collisions at the LHC. The strong interaction of charm quarks with this medium might also generate a non-zero elliptic flow of D mesons as first studies of the azimuthal anisotropy of D^0-meson production suggest.

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。

↑