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Correlations between jets and charged particles in PbPb and pp collisions at sNN=2.76 √snn= 2.76TeV

CMS Collaboration; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; ... mehr



Abstract (englisch): The quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 μ b −1 and 5.3 pb −1 , respectively, collected at s N N = 2.76 sNN−−−√=2.76 TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity (Δ η ) and relative azimuthal angle (Δ ϕ ) with respect to reconstructed jet directions. Charged particles are correlated with all jets with transverse momentum ( p T ) above 120 GeV, and with the leading and subleading jets (the highest and second-highest in p T , respectively) in a selection of back-to-back dijet events. Modifications in PbPb data relative to pp reference data are characterized as a function of PbPb collision centrality and charged particle p T . A centrality-dependent excess of low- p T particles is present for all jets studied, and is most pronounced in the most central events. This excess of low- p T particles follows a Gaussian-like distribution around the jet axis, and extends to large relative angles of Δ η ≈ 1 and Δ ϕ ≈ 1.


Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/JHEP02(2016)156
ISSN: 1126-6708
URN: urn:nbn:de:swb:90-540050
KITopen ID: 1000054005
Erschienen in Journal of High Energy Physics
Band 2016
Heft 2
Seiten 1-39
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
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