We report a measurement of the ratio of branching fractions of the decays B(+/-) -> J/psi pi(+/-) and B(+/-) -> J/psi K(+/-) using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B(+/-) -> J/psi pi(+/-) decay is separated from B(+/-) -> J/psi K(+/-) using the B(+/-) -> J/psi K(+/-) invariant mass distribution and the kinematical differences of the hadron track in the two decay modes. From a sample of 220 pb(-1) of p (p) over bar collisions at root s = 1.96 TeV, we observe 91 +/- 15 B(+/-) -> J/psi pi(+/-) events together with 1883 +/- 34 B(+/-) -> J/psi K(+/-) events. The ratio of branching fractions is found to be B(B(+/-) -> J/psi pi(+/-))/B(B(+/-) -> J/psi K(+/-)) = (4.86 +/- 0.82(stat) +/- 0.15(syst))%.
Measurement of the ratio of branching fractions B(B(+/-) -> J/psi pi(+/-))/B(B(+/-) -> J/psi K(+/-)) RID G-1087-2011 RID E-4473-2011
DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2009-01-01
Abstract
We report a measurement of the ratio of branching fractions of the decays B(+/-) -> J/psi pi(+/-) and B(+/-) -> J/psi K(+/-) using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B(+/-) -> J/psi pi(+/-) decay is separated from B(+/-) -> J/psi K(+/-) using the B(+/-) -> J/psi K(+/-) invariant mass distribution and the kinematical differences of the hadron track in the two decay modes. From a sample of 220 pb(-1) of p (p) over bar collisions at root s = 1.96 TeV, we observe 91 +/- 15 B(+/-) -> J/psi pi(+/-) events together with 1883 +/- 34 B(+/-) -> J/psi K(+/-) events. The ratio of branching fractions is found to be B(B(+/-) -> J/psi pi(+/-))/B(B(+/-) -> J/psi K(+/-)) = (4.86 +/- 0.82(stat) +/- 0.15(syst))%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
