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

Contributeurs/tricesATLAS Collaboration
Publié dansPhysics letters. B, vol. 697, no. 4, p. 294-312
Date de publication2011
Résumé

Using the ATLAS detector, a centrality-dependent suppression has been observed in the yield of J/ψ 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 √(sNN)=2.76 TeV, corresponding to an integrated luminosity of about 6.7 μb−1, J/ψ mesons are reconstructed via their decays to μ+μ−μ+μ− pairs. The measured J/ψ 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 experiments. 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/ψJ/ψ and Z production in lead–lead collisions at the LHC.

Mots-clés
  • ATLAS
  • LHC
  • Heavy ions
  • J/ψ
  • Z boson
  • Centrality dependence
Citation (format ISO)
ATLAS Collaboration. Measurement of the centrality dependence of <em>J/ψ</em> yields and observation of <em>Z</em> production in lead–lead collisions with the ATLAS detector at the LHC. In: Physics letters. B, 2011, vol. 697, n° 4, p. 294–312. doi: 10.1016/j.physletb.2011.02.006
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Article (Published version)
accessLevelPublic
Identifiants
ISSN du journal0370-2693
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Informations techniques

Création31.10.2014 11:43:00
Première validation31.10.2014 11:43:00
Heure de mise à jour14.03.2023 22:11:46
Changement de statut14.03.2023 22:11:46
Dernière indexation16.01.2024 12:16:00
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