arXiv:1102.0206·v2·High Energy Physics — Experiment
First observation of Bs -> J/psi f0(980) decays
The LHCb Collaboration: R. Aaij🇳🇱 · B. Adeva🇪🇸 · M. Adinolfi🇬🇧 · C. Adrover🇫🇷 · A. Affolder🇬🇧 · Z. Ajaltouni🇫🇷 · J. Albrecht🇨🇭 · F. Alessio🇨🇭 · M. Alexander🇬🇧 · P. Alvarez Cartelle🇪🇸 · A.A. Alves Jr🇮🇹 · S. Amato🇧🇷
Abstract
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the B_s system. Using a fit to the pi+ pi- mass spectrum with interfering resonances gives R_{f0/phi} = [Gamma(Bs -> J/psi f0, f0 -> pi+ pi-)]/[Gamma(Bs -> J/psi phi, phi -> K+K-)] = 0.252^{+0.046+0.027}_{-0.032-0.033}, where the uncertainties are statistical and systematic, respectively.
Comments: 11 pages, 6 figures. To be published in Physics Letters B