The production of χb mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of √s=7 and 8 TeV and corresponding to an integrated luminosity of 3.0 fb^−1. The χb mesons are identified through their decays to ϒ(1S) γ and ϒ(2S) γ using photons that converted to e+ e− pairs in the detector. The relative prompt production rate of χb1(1P) and χb2(1P) mesons is measured as a function of the ϒ(1S) transverse momentum in the χb rapidity range 2.0 < y < 4.5. A precise measurement of the χb(3P) mass is also performed. Assuming a mass splitting between the χb1(3P) and the χb2(3P) states of 10.5 MeV/c2, the measured mass of the χb1(3P) meson is m(χb1(3P)) = 10515.7 {−3.9}{+2.2}(stat) {−2.1}{+1.5}(syst) MeV/c2.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Measurement of the χb(3P) Mass and of the Relative Rate of χb1(1P) and χb2(1P) Production. JOURNAL OF HIGH ENERGY PHYSICS, 2014(10), 0-21 [10.1007/JHEP10(2014)088].

Measurement of the χb(3P) Mass and of the Relative Rate of χb1(1P) and χb2(1P) Production

CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

The production of χb mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of √s=7 and 8 TeV and corresponding to an integrated luminosity of 3.0 fb^−1. The χb mesons are identified through their decays to ϒ(1S) γ and ϒ(2S) γ using photons that converted to e+ e− pairs in the detector. The relative prompt production rate of χb1(1P) and χb2(1P) mesons is measured as a function of the ϒ(1S) transverse momentum in the χb rapidity range 2.0 < y < 4.5. A precise measurement of the χb(3P) mass is also performed. Assuming a mass splitting between the χb1(3P) and the χb2(3P) states of 10.5 MeV/c2, the measured mass of the χb1(3P) meson is m(χb1(3P)) = 10515.7 {−3.9}{+2.2}(stat) {−2.1}{+1.5}(syst) MeV/c2.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Measurement of the χb(3P) Mass and of the Relative Rate of χb1(1P) and χb2(1P) Production. JOURNAL OF HIGH ENERGY PHYSICS, 2014(10), 0-21 [10.1007/JHEP10(2014)088].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/363315
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