Measurement of jet p T correlations in Pb + Pb and pp collisions at s NN =2.76 TeVwith the ATLAS detector
Measurements of dijet p T correlations in Pb+Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of s NN =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 o...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03702693_v774_n_p379_Aaboud |
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| Sumario: | Measurements of dijet p T correlations in Pb+Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of s NN =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-k t 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 p T 1 and p T 2 . An unfolding procedure is applied to the two-dimensional (p T 1 ,p T 2 ) distributions to account for experimental effects in the measurement of both jets. Distributions of (1/N)dN/dx J , where x J =p T 2 /p T 1 , are presented as a function of p T 1 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. © 2017 The Author |
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