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Measurement of inclusive jet charged-particle fragmentation functions in Pb plus Pb collisions at root S-NN=2.76 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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2014 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 739, 320-342 p.Article in journal (Refereed) Published
Abstract [en]

Measurements of charged-particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions can provide insight into the modification of parton showers in the hot, dense medium created in the collisions. ATLAS has measured jets in sNN=2.76TeV Pb+Pb collisions at the LHC using a data set recorded in 2011 with an integrated luminosity of 0.14 nb-1. Jets were reconstructed using the anti-kt algorithm with distance parameter values R=0.2, 0.3, and 0.4. Distributions of charged-particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality for R=0.4 jets with pTjet>100GeV. Commensurate minimum pT values are used for the other radii. Ratios of fragment distributions in each centrality bin to those measured in the most peripheral bin are presented. These ratios show a reduction of fragment yield in central collisions relative to peripheral collisions at intermediate z values, 0.04≲z≲0.2, and an enhancement in fragment yield for z≲0.04. A smaller, less significant enhancement is observed at large z and large pT in central collisions.

Place, publisher, year, edition, pages
2014. Vol. 739, 320-342 p.
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Physical Sciences
URN: urn:nbn:se:kth:diva-158879DOI: 10.1016/j.physletb.2014.10.065ISI: 000346002000047ScopusID: 2-s2.0-84911445466OAI: diva2:779600
Swedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20150113

Available from: 2015-01-13 Created: 2015-01-12 Last updated: 2015-01-13Bibliographically approved

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, Anthony K.Strandberg, Jonas
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