Universitat de Barcelona
 mesons in pp collisions at s%E2%88%9A=7 TeVs=7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb%E2%88%921. The %CF%88(2S) mesons are reconstructed in the decay channels %CF%88(2S)%E2%86%92%CE%BC + %CE%BC %E2%88%92 and %CF%88(2S)%E2%86%92J/%CF%88%CF%80 + %CF%80 %E2%88%92, with the J/%CF%88 meson decaying into two muons. Results are presented both for promptly produced %CF%88(2S) mesons and for those originating from b-hadron decays. In the kinematic range p T(%CF%88(2S))%E2%89%A416 GeV/c and 2<y(%CF%88(2S))%E2%89%A44.5 we measure%0D%0Ahttps://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equa_HTML.gif%0D%0Awhere the last uncertainty on the prompt cross-section is due to the unknown %CF%88(2S) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb J/%CF%88 measurements we determine the inclusive branching fraction%0D%0Ahttps://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equb_HTML.gif%0D%0Awhere the last uncertainty is due to the %EE%88%AE(b%E2%86%92J/%CF%88X)B(b%E2%86%92J/%CF%88X) , %EE%88%AE(J/%CF%88%E2%86%92%CE%BC+%CE%BC%E2%88%92)B(J/%CF%88%E2%86%92%CE%BC+%CE%BC%E2%88%92) and %EE%88%AE(%CF%88(2S)%E2%86%92e+e%E2%88%92)B(%CF%88(2S)%E2%86%92e+e%E2%88%92) branching fraction uncertainties.)
2016-06-06T11:06:17Z
2016-06-06T11:06:17Z
2012-04
2016-06-06T11:06:23Z
The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at s√=7 TeVs=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 p T(ψ(2S))≤16 GeV/c and 2<y(ψ(2S))≤4.5 we measure https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equa_HTML.gif 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 https://static-content.springer.com/image/art%3A10.1140%2Fepjc%2Fs10052-012-2100-4/MediaObjects/10052_2012_2100_Equb_HTML.gif where the last uncertainty is due to the (b→J/ψX)B(b→J/ψX) , (J/ψ→μ+μ−)B(J/ψ→μ+μ−) and (ψ(2S)→e+e−)B(ψ(2S)→e+e−) branching fraction uncertainties.
Article
Published version
English
Teoria quàntica de camps; Gravitació; Relativitat (Física); Teoria quàntica; Hadrons; Quantum field theory; Gravitation; Relativity (Physics); Quantum theory; Hadrons
Società Italiana di Fisica & Springer Verlag
Reproducció del document publicat a: http://dx.doi.org/10.1140/epjc/s10052-012-2100-4
European Physical Journal C, 2012, vol. 72, p. 2100
http://dx.doi.org/10.1140/epjc/s10052-012-2100-4
cc-by (c) LHCb Collaboration, 2012
http://creativecommons.org/licenses/by/3.0/es
