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Measurement of the centrality dependence of J/? yields and observation of Z production in lead-lead collisions with the ATLAS detector at the LHC

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posted on 2023-06-08, 15:31 authored by Alessandro CerriAlessandro Cerri, Antonella De SantoAntonella De Santo, C J Potter, Fabrizio SalvatoreFabrizio Salvatore, Mark SuttonMark Sutton, Iacopo Vivarelli, and the ATLAS Collaboration
Using the ATLAS detector, a centrality-dependent suppression has been ob- served in the yield of J/? mesons produced in the collisions of lead ions at the Large Hadron Collider. In a sample of minimum-bias lead-lead collisions at a nucleon-nucleon centre of mass energy vsNN = 2.76 TeV, corresponding to an integrated luminosity of about 6.7 µb-1, J/? mesons are reconstructed via their decays to µ+µ- pairs. The measured J/? yield, normalized to the number of binary nucleon-nucleon collisions, is found to significantly decrease from peripheral to central collisions. The centrality dependence is found to be qualitatively similar to the trends observed at previous, lower energy ex- periments. The same sample is used to reconstruct Z bosons in the µ+µ- final state, and a total of 38 candidates are selected in the mass window of 66 to 116 GeV. The relative Z yields as a function of centrality are also presented, although no conclusion can be inferred about their scaling with the number of binary collisions, because of limited statistics. This analysis provides the first results on J/? and Z production in lead-lead collisions at the LHC.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physics Letters B

ISSN

0370-2693

Publisher

Elsevier

Issue

4

Volume

697

Page range

294-312

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2013-08-19

First Open Access (FOA) Date

2013-08-19

First Compliant Deposit (FCD) Date

2013-08-19

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