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Measurement of the χ b (3P) mass and of the relative rate of χ b1(1P) and χ b2(1P) production
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, O'Hanlon, Daniel P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Measurement of the χ b (3P) mass and of the relative rate of χ b1(1P) and χ b2(1P) production. Journal of High Energy Physics, Volume 2014 (Number 10). Article number 88. doi:10.1007/JHEP10(2014)088 ISSN 1029-8479.
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Official URL: http://dx.doi.org/10.1007/JHEP10(2014)088
Abstract
The production of χ b 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 χ b 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 χ b1(1P) and χ b2(1P) mesons is measured as a function of the ϒ(1S) transverse momentum in the χ b rapidity range 2.0 < y <4.5. A precise measurement of the χ b (3P) mass is also performed. Assuming a mass splitting between the χ b1(3P) and the χ b2(3P) states of 10.5 MeV/c2, the measured mass of the χ b1(3P) meson is
m(χb1(3P))=10515.7+2.2−3.9(stat)+1.5−2.1(syst)MeV/c2.
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