Speaker
Sean Benson
(University of Edinburgh (GB))
Description
A first measurement of the time-dependent CP-violating asymmetry in hadronic
B_s → φφ decays is presented. In this decay channel, the CP -violating weak phase
arises due to CP violation in the interference between B_s − bar{B}_s mixing and the
b → s bar{s} s hadronic penguin decay amplitude. Using a sample of 1.0 fb^−1 of pp
collision data collected at a centre-of mass energy of sqrt{s}=7 TeV with the LHCb
detector, 880 ± 31 B_s → φφ signal decays are extracted. Using this sample, the phase is measured to be in the interval [−2.46, −0.76] rad at 68% confidence level. The p-value of the Standard Model hypothesis is 16%.
Primary author
Sean Benson
(University of Edinburgh (GB))
