Observation of B0(s) →j/ψp p decays and precision measurements of the B0(s) masses

Research output: Contribution to journalArticle

Authors

  • LHCb Collaboration
  • R. Aaij
  • C. Abellán Beteta
  • B. Adeva
  • M. Adinolfi
  • C. A. Aidala
  • Z. Ajaltouni
  • S. Akar
  • P. Albicocco
  • J. Albrecht
  • F. Alessio
  • M. Alexander
  • A. Alfonso Albero
  • G. Alkhazov
  • P. Alvarez Cartelle
  • A. A. Alves
  • S. Amato
  • S. Amerio
  • Y. Amhis
  • L. An
  • L. Anderlini
  • G. Andreassi
  • M. Andreotti
  • J. E. Andrews
  • F. Archilli
  • J. Arnau Romeu
  • A. Artamonov
  • M. Artuso
  • K. Arzymatov
  • E. Aslanides
  • M. Atzeni
  • B. Audurier
  • S. Bachmann
  • J. J. Back
  • S. Baker
  • V. Balagura
  • W. Baldini
  • Simone Bifani
  • R. Calladine
  • G. Chatzikonstantinidis
  • N. Farley
  • P. Griffith
  • Philip Ilten
  • Cristina Lazzeroni
  • L. Pescatore
  • J. Plews
  • Dmitry Popov
  • Antonino Sergi
  • Mark Slater
  • Nigel Watson
  • K. A. Zarebski

Colleges, School and Institutes

External organisations

  • Nikhef National Institute for Subatomic Physics
  • Universität Zürich
  • Universidad de Santiago de Compostela
  • BRISTOL UNIVERSITY
  • University of Michigan, Ann Arbor.
  • Syracuse University, Syracuse, New York 13244, USA
  • LPC
  • University of Cincinnati
  • Laboratori Nazionali dell'Infn di Frascati
  • Technische Universität Dortmund
  • European Organization for Nuclear Research (CERN)
  • University of Glasgow
  • Universitat de Barcelona
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • Universidade Federal Do Rio de Janeiro (UFRJ)
  • INFN Padova
  • IN2P3
  • Sezione INFN di Firenze
  • Sezione INFN di Ferrara
  • University of Maryland, College Park, Maryland 20742 USA
  • CNRS/IN2P3
  • Institute for High Energy Physics (IHEP)
  • Yandex School of Data Analysis
  • INFN Sezione di Cagliari
  • Ruprecht-Karls-Universität Heidelberg
  • THE UNIVERSITY OF WARWICK
  • Laboratoire Leprince-Ringuet
  • Institute of Physics
  • Max-Planck-Institut für Kernphysik (MPIK)
  • Ecole Polytechnique Fédérale de Lausanne
  • Laboratory of Photonics and Interfaces, Department de Chimie, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland. ahmad@mpip-mainz.mpg.de

Abstract

The first observation of the decays B0(s) →J/ψpp is reported, using proton-proton collision data corresponding to an integrated luminosity of 5.2 fb-1, collected with the LHCb detector. These decays are suppressed due to limited available phase space, as well as due to Okubo-Zweig-Iizuka or Cabibbo suppression. The measured branching fractions are B(B0→J/ψpp)=[4.51±0.40(stat)±0.44(syst)]×10-7, B(B0s→J/ψpp)=[3.58±0.19(stat)±0.39(syst)]×10-6. For the B0s meson, the result is much higher than the expected value of O(10-9). The small available phase space in these decays also allows for the most precise single measurement of both the B0 mass as 5279.74±0.30(stat)±0.10(syst) MeV and the B0s mass as 5366.85±0.19(stat)±0.13(syst) MeV.

Details

Original languageEnglish
Article number191804
Number of pages10
JournalPhysical Review Letters
Volume122
Issue number19
Publication statusPublished - 17 May 2019

ASJC Scopus subject areas