skip to main content

Title: Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at √ sNN = 2.76 TeV with the ATLAS detector

In this study, 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 √s NN = 2.76 TeV 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 p T jet. Commensurate minimum p T values are used for the other radii. The 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 p T in central collisions.
 [1] ;  [2] ;  [3] ;  [4]
  1. Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Academia Sinica, Taipei (Taiwan)
  4. Univ. Paris-Sud and CNRS/IN2P3, Orsay (France). et. al.
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 739; Journal Issue: C; Journal ID: ISSN 0370-2693
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States