Dijet asymmetries in Pb+Pb and pp collisions with the ATLAS detector

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Havener, Laura^1

Physics Department, Columbia University, New York

NY

10027, United States^1

关键词: Background subtraction;    Centre-of-mass energies;    Integrated luminosity;    Large Hadron collider LHC;    Measurements of;    Nucleon-nucleon;    Transverse momenta;    Unfolding procedures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012007/pdf
DOI  :  10.1088/1742-6596/832/1/012007

来源: IOP

【 摘 要 】

Measurements of dijet pTcorrelations in both Pb+Pb and pp collisions at a nucleon-nucleon centre-of-mass energy of = 2.76 TeV are presented. The measurements were performed with the ATLAS detector at the Large Hadron Collider (LHC) using Pb+Pb and pp data samples with integrated luminosities of 0.14 nb-1and 4.0 pb-1, respectively. Jets were reconstructed using the anti-ktalgorithm with R = 0.4. A background subtraction procedure was applied to correct the jets for the large underlying event present in Pb+Pb collisions. The leading and subleading jet transverse momenta are denoted pT1and pT2. An unfolding procedure is applied to the two-dimensional pT1-pT2distributions to account for experimental effects in the measurement of both jets. Distributions of , where , are presented as a function of pT1and 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. The results are qualitatively consistent with expectations from partonic energy loss.