Measurement of the χ[subscript b](3P) mass and of the relative rate of χ[subscript b1](1P) and χ[subscript b2](1P) production
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, M.
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The production of χ[subscript 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[superscript −1]. The χ[subscript b] mesons are identified through their decays to ϒ(1S)[subscript γ] and ϒ(2S)[subscript γ] using photons that converted to e[superscript +]e[superscript −] pairs in the detector. The relative prompt production rate of χ[subscript b1](1P) and χ[subscript b2](1P) mesons is measured as a function of the ϒ(1S) transverse momentum in the χ[subscript b] rapidity range 2.0 < y <4.5. A precise measurement of the χ[subscript b](3P) mass is also performed. Assuming a mass splitting between the χ[subscript b1](3P) and the χ[subscript b2](3P) states of 10.5 [MeV over c[superscript 2]], the measured mass of the χ[subscript b1](3P) meson is m(χ[subscript b1](3P)) = 10515.7[+2.2 over −3.9](stat)[+1.5 over −2.1](syst) [MeV over c[superscript 2]].
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Measurement of the χ[subscript b](3P) Mass and of the Relative Rate of χ[subscript b1](1P) and χ[subscript b2](1P) Production.” J. High Energ. Phys. 2014, no. 10 (October 2014).
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