The production of Upsilon(1S), Upsilon (2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy of root s = 7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb(-1) collected at the Large Hadron Collider. The Upsilon mesons are reconstructed in the decay mode Upsilon -> mu(+)mu(-) and the signal yields are extracted from a fit to the mu(+)mu(-) invariant mass distributions. The differential production cross-sections times dimuon branching fractions are measured as a function of the Upsilon transverse momentum p(T) and rapidity y, over the range p(T) < 15 GeV/c and 2.0 < y < 4.5. The cross-sections times branching fractions, integrated over these kinematic ranges, are measured to be sigma(pp -> Upsilon(1S) X) x B(Upsilon (1S) -> mu(+)mu(-)) = 2.29+/-0.01+/-0.10(-0.37)(+0.19) nb, sigma(pp -> Upsilon(2S) X x B(Upsilon(2S) -> mu(+)mu(-)) = 0.562+/-0.007+/-0.023(-0.092)(+0.048) nb, sigma(pp -> Upsilon(3S) X) x B(Upsilon(3S) -> mu(+)mu(-)) = 0.283+/-0.005+/-0.012(-0.048)(+0.025) nb, where the first uncertainty is statistical, the second systematic and the third is due to the unknown polarisation of the three Upsilon states.

Aaij, R., Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). Measurement of Upsilon production in pp collisions at root s=7 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 72(6), 1-12 [10.1140/epjc/s10052-012-2025-y].

Measurement of Upsilon production in pp collisions at root s=7 TeV

CALVI, MARTA;FANCHINI, ERICA;
2012

Abstract

The production of Upsilon(1S), Upsilon (2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy of root s = 7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb(-1) collected at the Large Hadron Collider. The Upsilon mesons are reconstructed in the decay mode Upsilon -> mu(+)mu(-) and the signal yields are extracted from a fit to the mu(+)mu(-) invariant mass distributions. The differential production cross-sections times dimuon branching fractions are measured as a function of the Upsilon transverse momentum p(T) and rapidity y, over the range p(T) < 15 GeV/c and 2.0 < y < 4.5. The cross-sections times branching fractions, integrated over these kinematic ranges, are measured to be sigma(pp -> Upsilon(1S) X) x B(Upsilon (1S) -> mu(+)mu(-)) = 2.29+/-0.01+/-0.10(-0.37)(+0.19) nb, sigma(pp -> Upsilon(2S) X x B(Upsilon(2S) -> mu(+)mu(-)) = 0.562+/-0.007+/-0.023(-0.092)(+0.048) nb, sigma(pp -> Upsilon(3S) X) x B(Upsilon(3S) -> mu(+)mu(-)) = 0.283+/-0.005+/-0.012(-0.048)(+0.025) nb, where the first uncertainty is statistical, the second systematic and the third is due to the unknown polarisation of the three Upsilon states.
Articolo in rivista - Articolo scientifico
flavor physics ; QCD ; quarkonium ; spectroscopy ; heavy quark production ; particle and resonance production ; experimental results
English
2012
1
12
12
Aaij, R., Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). Measurement of Upsilon production in pp collisions at root s=7 TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 72(6), 1-12 [10.1140/epjc/s10052-012-2025-y].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/37377
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