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Measurement of jet pT correlations in Pb + Pb and pp collisions at √sNN=2.76TeV with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 28352017 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 774, p. 379-402Article in journal (Refereed) Published
Abstract [en]

Measurements of dijet Pt correlations in Pb+Pb and pp collisions at a nucleon-nucleon centre-of-mass energy of root 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(T1) and p(T2). An unfolding procedure is applied to the two-dimensional (p(T1) , p(T2)) distributions to account for experimental effects in the measurement of both jets. Distributions of (1/N)dN/dx(J), where X-J = p(T2)/p(T1) , are presented as a function of p(T1) 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.

Place, publisher, year, edition, pages
2017. Vol. 774, p. 379-402
National Category
Subatomic Physics
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URN: urn:nbn:se:uu:diva-345300DOI: 10.1016/j.physletb.2017.09.078ISI: 000414973200051OAI: oai:DiVA.org:uu-345300DiVA, id: diva2:1188989
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2017.09.078

Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-03-09Bibliographically approved

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Bergeås, Elin KuutmannBokan, PeterBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudMårtensson, MikaelÖhman, HenrikRangel-Smith, Camilla

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Bergeås, Elin KuutmannBokan, PeterBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudMårtensson, MikaelÖhman, HenrikRangel-Smith, Camilla
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