Measurement of jet pT correlations in Pb + Pb and pp collisions at sNN=2.76 TeVwith the ATLAS detector

The ATLAS collaboration

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Measurements of dijet pT correlations in Pb+Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of sNN=2.76 TeV are presented. The measurements are performed with the ATLAS detector at the Large Hadron Collider using Pb+Pb and pp data samples corresponding to integrated luminosities of 0.14 nb−1 and 4.0 pb−1, respectively. Jets are reconstructed using the anti-kt algorithm with radius parameter values R=0.3 and R=0.4. A background subtraction procedure is applied to correct the jets for the large underlying event present in Pb+Pb collisions. The leading and sub-leading jet transverse momenta are denoted pT1 and pT2 . An unfolding procedure is applied to the two-dimensional (pT1 ,pT2 ) distributions to account for experimental effects in the measurement of both jets. Distributions of (1/N)dN/dxJ, where xJ=pT2 /pT1 , are presented as a function of pT1 and collision centrality. The distributions are found to be similar in peripheral Pb+Pb collisions and pp collisions, but highly modified in central Pb+Pb collisions. Similar features are present in both the R=0.3 and R=0.4 results, indicating that the effects of the underlying event are properly accounted for in the measurement. The results are qualitatively consistent with expectations from partonic energy loss models.

Original languageEnglish
Pages (from-to)379-402
Number of pages24
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume774
DOIs
Publication statusPublished - 10 Nov 2017

Keywords

  • TRANSVERSE-MOMENTUM DEPENDENCE
  • LEAD-LEAD COLLISIONS

Fingerprint Dive into the research topics of 'Measurement of jet p<sub>T</sub> correlations in Pb + Pb and pp collisions at s<sub>NN</sub>=2.76 TeVwith the ATLAS detector'. Together they form a unique fingerprint.

Cite this