B physics: evidence for the exclusive decay b^+/-_c -> j/psi pi^+ and measurement of the mass of the b^+/-_c meson

Acosta, D. ; Collaboration, The CDF

Lawrence Berkeley National Laboratory

关键词: Decay;    Luminosity;    43 Particle Accelerators;    Mesons;    Physics;   

DOI  :  10.2172/842923
RP-ID  :  LBNL--58130
RP-ID  :  AC03-76SF00098
RP-ID  :  842923

美国|英语

来源: UNT Digital Library

【 摘 要 】

We report the first evidence of a fully reconstructed decay mode of the B{sub c}{sup {+-}} meson in the channel B{sub c}{sup {+-}} {yields} J/{psi}{sup {+-}}, with J/{psi} {yields} {mu}{sup +}{mu}{sup -}. The analysis is based on an integrated luminosity of 360 pb{sup -1} in p{bar p} collisions collected by the Collider Detector at Fermilab. We observe 18.9 {+-} 5.7 signal events on a background of 10.0 {+-} 1.4 events and the fit to the J/{psi}{pi}{sup {+-}} mass spectrum yields a B{sub c}{sup {+-}} mass of 6287.0 {+-} 4.8(stat) {+-} 1.1(syst) MeV/c{sup 2}.