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Measurement of the centrality dependence of J/psi yields and observation of Z production in lead-lead collisions with the ATLAS detector at the LHC
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
University of Chicago.ORCID iD: 0000-0002-8913-0981
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2011 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 697, no 4, 294-312 p.Article in journal (Refereed) Published
Abstract [en]

Using the ATLAS detector, a centrality-dependent suppression has been observed in the yield of J/psi 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 root s(NN) = 2.76 TeV, corresponding to an integrated luminosity of about 6.7 mu b(-1), J/psi mesons are reconstructed via their decays to mu(+)mu(-) pairs. The measured J/psi 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 mu(+)mu(-) 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/psi and Z production in lead-lead collisions at the LHC.

Place, publisher, year, edition, pages
2011. Vol. 697, no 4, 294-312 p.
Keyword [en]
ATLAS, LHC, Heavy ions, J/psi, Z boson, Centrality dependence
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-32172DOI: 10.1016/j.physletb.2011.02.006ISI: 000288300400006ScopusID: 2-s2.0-79960106869OAI: diva2:409362
Swedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20110408Available from: 2011-04-08 Created: 2011-04-08 Last updated: 2012-02-14Bibliographically approved

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Grahn, Karl-JohanLund-Jensen, BengtStrandberg, JonasLafaye, Remi
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