Measurements of b-jet nuclear modification factors in pPb and PbPb collisions with CMS

被引：6

作者：

Jung, Kurt ^{[1
]}

机构：

[1] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

来源：

NUCLEAR PHYSICS A | 2014年 / 931卷

基金：

英国科学技术设施理事会;

关键词：

QGP; b Jets; Energy-loss;

D O I：

10.1016/j.nuclphysa.2014.09.086

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present measurements of the nuclear modification factors R-AA and R-pA(PYATHIA) of b jets in lead lead and proton lead collisions, respectively, using the CMS detector. Jets from b-quark fragmentations are found by exploiting the long lifetime of the b-quark through tagging methods using distributions of the secondary vertex displacement. From these, b-jet cross-sections are calculated and compared to the pp cross-section from the 2.76 TeV pp data collected in 2013 and to a PYTHIA simulation at 5.02 TeV, where these center-of-mass energies correspond to those of the PbPb and pPb data. We observe significant suppression for b jets in PbPb, and a R-pA(PYATHIA) value consistent with unity for b jets in pPb. Results from both collision species show remarkable correspondence with inclusive-jet suppression measurements, indicating that mass-dependent energy-loss effects are negligible at PT values greater than around 50 GeV/c. We use 150 mu b(-1) of lead-lead data and 35 nb(-1) of proton-lead data collected at the LHC. (C) 2014 CERN. Published by Elsevier B.V. All rights reserved.

引用

页码：470 / 474

页数：5

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