Observation of a peaking structure in the J/psi phi mass spectrum from B+/- to J/psi phi K+/- decays - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2014

Observation of a peaking structure in the J/psi phi mass spectrum from B+/- to J/psi phi K+/- decays

S. Chatrchyan
  • Function : Author
P. Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini
P. Verdier
S. Viret

Abstract

A peaking structure in the J/psi phi mass spectrum near threshold is observed in B(+/-) to J/psi phi K(+/-) decays, produced in pp collisions at sqrt(s) = 7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/psi, corresponds to an integrated luminosity of 5.2 inverse femtobarns. Fitting the structure to an S-wave relativistic Breit-Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m=4148.0 +/- 2.4 (stat.) +/- 6.3 (syst.) MeV and Gamma=28 -11+15 (stat.) +/- 19 (syst.) MeV, respectively. Evidence for an additional peaking structure at higher J/psi phi mass is also reported.

Dates and versions

in2p3-00869407 , version 1 (03-10-2013)

Identifiers

Cite

S. Chatrchyan, M. Besancon, S. Choudhury, F. Couderc, M. Dejardin, et al.. Observation of a peaking structure in the J/psi phi mass spectrum from B+/- to J/psi phi K+/- decays. Physics Letters B, 2014, 734, pp.261. ⟨10.1016/j.physletb.2014.05.055⟩. ⟨in2p3-00869407⟩
25 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More