22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

Improved Measurement of the Electroweak Penguin Process B --> X_s l^+ l^-

24 Jul 2010, 11:30
13m
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays

Speaker

Cheng-Chin Chiang (National Taiwan University)

Description

We have performed a search for the decay B --> X_s l^+l^- using a pseudo-inclusive reconstruction technique. Using a data sample of 657 x 10^6 BB pairs, we observe a clear signal, including 238.3 +- 26.4 +- 2.3 events in the mass region M(X_s) < 2.0 GeV/c^2. The measured branching fraction is BR(B -> X_s l l) = (3.33 +- 0.80(stat) ^{+0.19}_{-0.24} (syst))x 10^{-6}; this result is restricted to the region M(l^+l^-) > 0.2 GeV/c^2.

Primary author

Presentation Materials