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Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead-lead collisions at root S-NN=2.76 TeV 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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2013 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 719, no 4-5, 220-241 p.Article in journal (Refereed) Published
Abstract [en]

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at root S-NN = 2.76 TeV corresponding to an integrated luminosity of approximately 7 mu b(-1), ATLAS has measured jets with a calorimeter system over the pseudorapidity interval vertical bar eta vertical bar < 2.1 and over the transverse momentum range 38 < pT <210 GeV. Jets were reconstructed using the anti-k(t) algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," R-CP. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. R-CP varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.

Place, publisher, year, edition, pages
2013. Vol. 719, no 4-5, 220-241 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-198500DOI: 10.1016/j.physletb.2013.01.024ISI: 000315316900004OAI: oai:DiVA.org:uu-198500DiVA: diva2:616355
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2013.01.024

Available from: 2013-04-16 Created: 2013-04-16 Last updated: 2017-12-06Bibliographically approved

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Brenner, RichardBuszello, Claus PEllert, MattiasFerrari, ArnaudIsaksson, CharliePelikan, Daniel

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