Measurement of the χb(3P) mass and of the relative rate of χb1(1P) and χb2(1P) production

LHCb Collaboration, 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. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

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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 8TeV 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.

Original languageEnglish
Article number88
Number of pages22
JournalJournal of High Energy Physics
Volume2014
Issue number10
DOIs
Publication statusPublished - 14 Oct 2014

Keywords

  • Flavor physics
  • Hadron-Hadron Scattering
  • Quarkonium

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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