Study of chi(b) meson production in pp collisions at root s=7 and 8 TeV and observation of the decay chi(b) (3P) -> gamma(3S)gamma

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, V. Batozskaya, V. Battista, A. Bay, Laurence Carson, P. E. L. Clarke, G. A. Cowan, Daniel Craik, S. Eisenhardt, Silvia Gambetta, F. Muheim, M. Needham, S. Playfer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A study of chi(b) 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 root s = 7 and 8 TeV. The fraction of gamma(nS) mesons originating from chi(b) decays is measured as a function of the gamma transverse momentum in the rapidity range 2.0 <y(gamma) <4.5. The radiative transition of the chi(b) (3P) meson to gamma(3S) is observed for the first time. The chi(b)1 (3P) mass is determined to be

m chi(b1) (3P) = 10 511.3 +/- 1.7 +/- 2.5MeV/c(2),

where the first uncertainty is statistical and the second is systematic.

Original languageEnglish
Article number3092
Pages (from-to)3092
Number of pages13
JournalEuropean Physical Journal C
Volume74
Issue number10
DOIs
Publication statusPublished - 8 Oct 2014

Keywords

  • UPSILON PRODUCTION
  • HEAVY-QUARKONIUM
  • PROMPT CHI(C)
  • J-PSI
  • B-S(0)
  • RATIO
  • B-0

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