Study of the kinematic dependences of Λb0 production in pp collisions and a measurement of the Λb0  → Λc + π branching fraction

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, 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. Anderson, R. AndreassenM. 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, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, 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 kinematic dependences of the relative production rates, fΛ0b /fd, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π and  B-0 → D+π decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb−1 at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < pT < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of fΛ0b /fd in semileptonic decays, the branching fraction B(Λ0b → Λ+c π) = (4.30±0.03+0.12−0.11±0.26± 0.21) ×10−3 is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ0b / fd and the fourth is due to the b B-0 → D+π branching fraction. This is the most precise measurement of a Λb0 branching fraction to date.

Original languageEnglish
Article number143
Number of pages19
JournalJournal of High Energy Physics
Volume2014
Issue number8
DOIs
Publication statusPublished - 26 Aug 2014

Keywords

  • B physics
  • Branching fraction
  • Hadron-Hadron Scattering
  • Heavy quark production
  • Particle and resonance production

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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