相对论重离子对撞机（RHIC）和大型强子对撞机（LHC）中孤立光子标记喷注产生的动量不平衡。

Momentum imbalance of isolated photon-tagged jet production at RHIC and LHC.

作者信息

Dai Wei, Vitev Ivan, Zhang Ben-Wei

机构信息

Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China.

Los Alamos National Laboratory, Theoretical Division, MS B238, Los Alamos, NM 87545, USA.

出版信息

Phys Rev Lett. 2013 Apr 5;110(14):142001. doi: 10.1103/PhysRevLett.110.142001. Epub 2013 Apr 2.

DOI:10.1103/PhysRevLett.110.142001

PMID:25166981

Abstract

In collisions of ultrarelativistic nuclei, photon-tagged jets provide a unique opportunity to compare jet production and modification due to parton shower formation and propagation in strongly interacting matter at vastly different center-of-mass energies. We present first results for the cross sections of jets tagged by an isolated photon to O(α(em)α(s)(2)) in central Au+Au reactions with sqrt[s(NN)] = 200 GeV at RHIC and central Pb + Pb reactions with sqrt[s(NN)] = 2.76 TeV at LHC. We evaluate the increase in the transverse momentum imbalance of the observed γ + jet state, induced by the dissipation of the parton shower energy due to strong final-state interactions. Theoretical predictions to help interpret recent and upcoming experimental data are presented.

摘要

在超相对论性核碰撞中，光子标记喷注提供了一个独特的机会，可用于比较在质心能量差异极大的强相互作用物质中，由于部分子喷注的形成和传播而导致的喷注产生和修正情况。我们给出了在相对论重离子对撞机（RHIC）上，质心能量√[s(NN)] = 200 GeV的中心金离子+金离子反应，以及在大型强子对撞机（LHC）上，质心能量√[s(NN)] = 2.76 TeV的中心铅离子+铅离子反应中，由孤立光子标记的喷注截面到O(α(em)α(s)(2))的首批结果。我们评估了由于强末态相互作用导致部分子喷注能量耗散而引起的观测到的γ + 喷注态横向动量不平衡的增加。还给出了有助于解释近期和即将到来的实验数据的理论预测。