The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapidities in pp collisions at √s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/ψ through its dilepton decay into e+e− and μ+μ− pairs in the rapidity range |y| < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero pT . In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity L(int) = 3.9 nb−1 and the number of signal events is N(J/ψ) = 249 ± 27 (stat.) ± 20 (syst.); the corresponding figures in the dimuon channel are L(int) = 15.6 nb−1 and N(J/ψ) = 1924 ± 77 (stat.) ± 144 (syst.). The measured production cross sections are σ(J/ψ)(|y| < 0.9) = 10.7 ± 1.2 (stat.) ± 1.7 (syst.) +1.6 −2.3 (syst.pol.) μb, and σ(J/ψ) (2.5 < y < 4) = 6.31 ± 0.25 (stat.) ± 0.80 (syst.) +0.95 −1.96 (syst.pol.) μb. The differential cross sections, in transverse momentum and rapidity, of the J/ψ were also measured.

Rapidity and transverse momentum dependence of inclusive J/ψproduction in pp collisions at √s = 7 TeV

R. Lea68;R. Rui 68;
2011-01-01

Abstract

The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapidities in pp collisions at √s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/ψ through its dilepton decay into e+e− and μ+μ− pairs in the rapidity range |y| < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero pT . In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity L(int) = 3.9 nb−1 and the number of signal events is N(J/ψ) = 249 ± 27 (stat.) ± 20 (syst.); the corresponding figures in the dimuon channel are L(int) = 15.6 nb−1 and N(J/ψ) = 1924 ± 77 (stat.) ± 144 (syst.). The measured production cross sections are σ(J/ψ)(|y| < 0.9) = 10.7 ± 1.2 (stat.) ± 1.7 (syst.) +1.6 −2.3 (syst.pol.) μb, and σ(J/ψ) (2.5 < y < 4) = 6.31 ± 0.25 (stat.) ± 0.80 (syst.) +0.95 −1.96 (syst.pol.) μb. The differential cross sections, in transverse momentum and rapidity, of the J/ψ were also measured.
2011
Sì, ma tipo non specificato
Inglese
STAMPA
2011
442
455
14
ALICE; rapidity; transverse momentum
http://www.sciencedirect.com/science/article/pii/S0370269311011270
963
info:eu-repo/semantics/article
262
Aamodt 1, K.; Abrahantes Quintana 2, A.; Adamová3, D.; Adare4, A. M.; Aggarwal 5, M. M.; Aglieri Rinella 6, G.; Agocs 7, A. G.; Agostinelli 8, A.; Agu...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/537540
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