par Acosta, Darin E.;De Lentdecker, Gilles 
; [et al.]
Référence Physical review letters, 93, 3, page (1-7), 032001
Publication Publié, 2004
; [et al.]Référence Physical review letters, 93, 3, page (1-7), 032001
Publication Publié, 2004
Article révisé par les pairs
| Résumé : | The decay mechanisms of in collisions were investigated. For discrimination of the decays from background events, four variables were used such as invariant mass of muon pair, B-candidate proper decay length, opening angle between B-hadron flight direction and B-candidate track isolation. A 'blind' analysis technique was also used for determination of optimal selection criteria for four variables. The results show that optimal set of selection criteria uses ∓80 MeV/c2 search window around B s 0 mass, and I > 0.65.We report on a search for Bs 0 → μ +μ- and Bd 0 → μ +μ- decays in pp̄ collisions at √s=1.96 TeV using 171 pb-1 of data collected by the CDF II experiment at the Fermilab Tevatron Collider. The decay rates of these rare processes are sensitive to contributions from physics beyond the standard model. One event survives all our selection requirements, consistent with the background expectation. We derive branching ratio limits of B(Bs 0 → μ +μ-)<5.8x10(-7) and B(Bd 0 → μ +μ-)<1.5x10(-7) at 90% confidence level. |
