$CP$ violation in $B_s^0$ decays at LHCb

Abstract

Latest LHCb measurements of $CP$ violation in the interference between mixing and decay are presented based on $pp$ collision data collected during LHC Run I, corresponding to an integrated luminosity of $3.0{\mathrm{fb}}^{-1}$. Approximately $27000$ $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ signal events are used to make what is at the moment the most precise single measurement of the $CP$-violating phase in $b\to c\bar{c}s$ transitions, ${\varphi }_s^{c\bar{c}s}=0.070\pm 0.068(stat.)\pm 0.008(syst.)$ rad. The most accurate measurement of the $CP$-violating phase in $b\to s\bar{s}s$ transitions, ${\varphi }_s^{s\bar{s}s}$, is found from approximately $4000$ $B_s^0\to \varphi \varphi$ signal events to be ${\varphi }_s^{s\bar{s}s}=-0.17\pm (stat.)0.15\pm 0.03(syst.)$ rad.

6 pages, 5 figures, presented at the second annual LHCP conference

References in corpus (4)

• Precision Physics with B^0_s -> J/psi phi at the LHC: The Quest for New Physics
• Unparticle physics effects in B_s mixing
• Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay
• Time-dependent Dalitz-plot formalism for B_q -> J/ψ h+ h-