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Measurement of the chi(b) (3 P) mass and of the relative rate of chi(b1) (1 P) and chi(b2) (1 P) production
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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 +2.2 −3.9 (stat)+1.5 −2.1 (syst) MeV/c2 .
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GARRIDO BELTRÁN, Lluís, et al. Measurement of the chi(b) (3 P) mass and of the relative rate of chi(b1) (1 P) and chi(b2) (1 P) production. Journal of High Energy Physics. 2014. Vol. 10, num. 088, pags. 1-24. ISSN 1126-6708. [consulted: 7 of June of 2026]. Available at: https://hdl.handle.net/2445/185619