Title:
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Measurement of ψ(2S) meson production in pp collisions at s√=7 TeV
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Author:
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Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Domingo Bonal, Francesc; Vilasís Cardona, Xavier; LHCb Collaboration - CERN
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Other authors:
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Universitat Ramon Llull. La Salle; CERN |
Abstract:
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The differential cross-section for the inclusive
production of ψ(2S) mesons in pp collisions at √s = 7 TeV
has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb−1.
The ψ(2S) mesons are reconstructed in the decay channels ψ(2S) → μ+μ− and ψ(2S) → J/ψπ+π−, with the
J/ψ meson decaying into two muons. Results are presented
both for promptly produced ψ(2S) mesons and for those
originating from b-hadron decays. In the kinematic range
pT(ψ(2S)) ≤ 16 GeV/c and 2 < y(ψ(2S)) ≤ 4.5 we measure
σprompt
ψ(2S)
= 1.44 ± 0.01 (stat) ± 0.12 (syst)
+0.20
−0.40 (pol) µb,
σb
ψ(2S)
= 0.25 ± 0.01 (stat) ± 0.02 (syst) µb,
where the last uncertainty on the prompt cross-section is due
to the unknown ψ(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/ψ
measurements we determine the inclusive branching fraction
B
b → ψ(2S)X
=
2.73 ± 0.06 (stat) ± 0.16 (syst) ± 0.24 (BF)
× 10−3,
where the last uncertainty is due to the B(b → J/ψX),
B(J/ψ → μ+μ−) and B(ψ(2S) → e+e−) branching fraction uncertainties. |
Publication date:
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2012-08 |
Subject(s):
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Gran col·lisionador d'hadrons (França i Suïssa) Interaccions d'hadrons Col·lisions (Física nuclear) Partícules (Física nuclear) |
Rights:
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L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/
© CERN |
Pages:
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12 p. |
Document type:
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Article Article - Published version |
DOI:
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https://doi.org/10.1140/epjc/s10052-012-2100-4
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Published by:
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Springer
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Publish at:
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The European Physical Journal C, 2012, Vol. 72, No. 2100
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