The observation of the Y ( 4140) structure in B-+/- -> J/psi phi K-+/- decays produced in (p) over barp collisions at root s = 1.96 TeV is reported with a statistical significance greater than 5 standard deviations. A fit to the J/psi phi mass spectrum is performed assuming the presence of a Breit-Wigner resonance. The fit yields a signal of 19 +/- 6 (stat) +/- 3 (syst) resonance events, and resonance mass and width of 4143.4(-3.0)(+2.9) ( stat) +/- 0.6 (syst) MeV/c(2) and 15.3(-6.1)(+10.4) (stat) +/- 2.5 (syst) MeV/c(2), respectively. The parameters of this resonance-like structure are consistent with values reported from an earlier CDF analysis.
Observation of the Y (4140) structure in the J/psi phi mass spectrum in B-+/- -> J/psi phi K-+/- decays
Di Ruzza B;
2017-01-01
Abstract
The observation of the Y ( 4140) structure in B-+/- -> J/psi phi K-+/- decays produced in (p) over barp collisions at root s = 1.96 TeV is reported with a statistical significance greater than 5 standard deviations. A fit to the J/psi phi mass spectrum is performed assuming the presence of a Breit-Wigner resonance. The fit yields a signal of 19 +/- 6 (stat) +/- 3 (syst) resonance events, and resonance mass and width of 4143.4(-3.0)(+2.9) ( stat) +/- 0.6 (syst) MeV/c(2) and 15.3(-6.1)(+10.4) (stat) +/- 2.5 (syst) MeV/c(2), respectively. The parameters of this resonance-like structure are consistent with values reported from an earlier CDF analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
