Modification of Jet Shapes in PbPb Collisions at √s[subscript NN] = 2.76 TeV

• Main Authors: Apyan, Aram (Contributor), Bauer, Gerry P. (Contributor), Busza, Wit (Contributor), Cali, Ivan Amos (Contributor), Chan, Matthew Hans (Contributor), Di Matteo, Leonardo (Contributor), Dutta, Valentina (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Goncharov, Maxim (Contributor), Gulhan, Doga Can (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Lai, Yue Shi (Contributor), Levin, Andrew Michael (Contributor), Luckey, P. David, Jr (Contributor), Ma, Teng (Contributor), Nahn, Steven (Contributor), Paus, Christoph M. E. (Contributor), Ralph, Duncan Kelley (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Stephans, George S. F. (Contributor), Stockli, Fabian (Contributor), Sumorok, Konstanty C. (Contributor), Velicanu, Dragos Alexandru (Contributor), Wolf, Roger (Contributor), Wyslouch, Boleslaw (Contributor), Yang, Mingming (Contributor), Yilmaz, Yetkin (Contributor), Yoon, Sungho (Contributor), Zanetti, Marco (Contributor), Zhukova, Victoria (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Massachusetts Institute of Technology. School of Science (Contributor)
• Format: Article
• Language: English
• Published: Elsevier, 2015-11-24T15:33:51Z.
• Subjects: Article
• Online Access: Get fulltext

The first measurement of jet shapes, defined as the fractional transverse momentum radial distribution, for inclusive jets produced in heavy-ion collisions is presented. Data samples of PbPb and pp collisions, corresponding to integrated luminosities of 150 μb[superscript −1] and 5.3 pb[superscript −1] respectively, were collected at a nucleon-nucleon centre-of-mass energy of √s[subscript NN] = 2.76 TeV with the CMS detector at the LHC. The jets are reconstructed with the anti- kT algorithm with a distance parameter R = 0.3 , and the jet shapes are measured for charged particles with transverse momentum p[subscript T] > 1 GeV/c . The jet shapes measured in PbPb collisions in different collision centralities are compared to reference distributions based on the pp data. A centrality-dependent modification of the jet shapes is observed in the more central PbPb collisions, indicating a redistribution of the energy inside the jet cone. This measurement provides information about the parton shower mechanism in the hot and dense medium produced in heavy-ion collisions.
United States. Dept. of Energy
National Science Foundation (U.S.)
Alfred P. Sloan Foundation