Study of Xmeson production in pp collisions at √s=7 and 8 TeV and observation of the decay Xb(3P) → ϒ (3S) γ

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, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, 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

A study of Xb meson production at LHCb is performed on proton–proton collision data, corresponding to 3.0 fb-1 of integrated luminosity collected at centre-of-mass energies √s= 7 and 8 TeV. The fraction of Υ (nS) mesons originating from χb decays is measured as a function of the ϒ transverse momentum in the rapidity range 2.0 < yϒ < 4.5. The radiative transition of the χb (3P) meson to Υ (3S) is observed for the first time. The χb1 (3P) mass is determined to be mχb1 (3P) = 10 511.3 ± 1.7 ± 2.5 MeV/c2, where the first uncertainty is statistical and the second is systematic.

Original languageEnglish
Article number3092
Number of pages13
JournalEuropean Physical Journal C
Volume74
Issue number10
DOIs
Publication statusPublished - 8 Oct 2014

Keywords

  • Transverse momentum
  • Invariant mass
  • Systematic uncertainty
  • Radiative decay
  • Electromagnetic calorimeter

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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