A combined mass and particle identification fit is used to make the first observation of the decay B-bar0_s --> D+/-_s --> D+/-_s K-/+ and measure the branching fraction of B-bar0_s --> D+/-_s K-/+ relative to B-bar0_s --> D+_s pi+-. This analysis uses 1.2 fb-1 integrated luminosity of p anti-p collisions at s**(1/2) =1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B-bar0_s --> D+/-_s K-/+ signal with a statistical significance of 8.1 sigma and measure B(B-bar0_s -> D+/-_s pi+-) =0.097 +/- 0.018(stat) +/- 0.009(sys).
A. Castro, M. Deninno, P. Mazzanti, N. Moggi, F. Rimondi, F. Semeria, et al. (2009). First Observation of B-bar0_s --> D+/-_s K-/+ and Measurement of the Ratio of Branching Fractions B(B-bar0_s --> D+/-_s K-/+)/B(B-bar0_s -> D+_s pi+-). PHYSICAL REVIEW LETTERS, 103, 191802-1-191802-7 [10.1103/PhysRevLett.103.191802].
First Observation of B-bar0_s --> D+/-_s K-/+ and Measurement of the Ratio of Branching Fractions B(B-bar0_s --> D+/-_s K-/+)/B(B-bar0_s -> D+_s pi+-)
CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MOGGI, NICCOLO';RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2009
Abstract
A combined mass and particle identification fit is used to make the first observation of the decay B-bar0_s --> D+/-_s --> D+/-_s K-/+ and measure the branching fraction of B-bar0_s --> D+/-_s K-/+ relative to B-bar0_s --> D+_s pi+-. This analysis uses 1.2 fb-1 integrated luminosity of p anti-p collisions at s**(1/2) =1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B-bar0_s --> D+/-_s K-/+ signal with a statistical significance of 8.1 sigma and measure B(B-bar0_s -> D+/-_s pi+-) =0.097 +/- 0.018(stat) +/- 0.009(sys).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
