Study of Jet Quenching with Z + jet Correlations in Pb-Pb and pp Collisions at √s[subscript NN] = 5.02 TeV
Author(s)Abercrombie, Daniel Robert; Allen, Brandon Leigh; Apyan, Aram; Azzolini, Virginia; Barbieri, Richard Alexander; Baty, Austin Alan; Bi, Ran; Bierwagen, Katharina; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; D'Alfonso, Mariarosaria; Demiragli, Zeynep; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Krajczar, Krisztian F.; Lai, Yue Shi; Lee, Yen-Jie; Levin, Amy Elizabeth; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Niu, Xinmei; Paus, Christoph M. E.; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Stephans, George S. F.; Tatar, Kaya; Varma, Mukund Madhav; Velicanu, Dragos Alexandru; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Mingming; ... Show more Show less
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The production of jets in association with Z bosons, reconstructed via the μ[superscript +]μ[superscript -] and e[superscript +]e[superscript -] decay channels, is studied in pp and, for the first time, in Pb-Pb collisions. Both data samples were collected by the CMS experiment at the LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The Pb-Pb collisions were analyzed in the 0%-30% centrality range. The back-to-back azimuthal alignment was studied in both pp and Pb-Pb collisions for Z bosons with transverse momentum p[superscript Z][subscript T] > 60 GeV/c and a recoiling jet with p[superscript jet][subscript T] > 30 GeV/c. The p[subscript T] imbalance x[subscript jZ]=p[superscript jet][subscript T]/p[superscript Z][subscript T], as well as the average number of jet partners per Z, R[subscript jZ], was studied in intervals of p[superscript Z][subscript T]. The R[subscript jZ] is found to be smaller in Pb-Pb than in pp collisions, which suggests that in Pb-Pb collisions a larger fraction of partons associated with the Z bosons fall below the 30 GeV/c p[superscript jet][subscript T] threshold because they lose energy.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
Sirunyan, A. M., et al. “Study of Jet Quenching with Z + Jet Correlations in Pb-Pb and P P Collisions √S[subscript NN] = 5.02 TeV.” Physical Review Letters, vol. 119, no. 8, Aug. 2017. © 2017 CERN, for the CMS Collaboration.
Final published version