# Measurement of $C\!P$ asymmetries in the decays $B^0 \rightarrow K^{*0}\mu^+ \mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2014). Measurement of $C\!P$ asymmetries in the decays $B^0 \rightarrow K^{*0}\mu^+ \mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$. Journal of High Energy Physics, 2014:177.

## Abstract

The direct $C\!P$ asymmetries of the decays $B^0 \rightarrow K^{*0} \mu^+\mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$ are measured using $pp$ collision data corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$ collected with the LHCb detector. The respective control modes $B^0 \rightarrow J/\psi K^{*0}$ and $B^+ \rightarrow J/\psi K^{+}$ are used to account for detection and production asymmetries. The measurements are made in several intervals of $\mu^+ \mu^-$ invariant mass squared, with the $\phi(1020)$ and charmonium resonance regions excluded. Under the hypothesis of zero $C\!P$ asymmetry in the control modes, the average values of the asymmetries are \begin{align}{\cal A}_{C\!P}(B^0 \rightarrow K^{*0} \mu^+ \mu^-) = -0.035 \pm 0.024 \pm 0.003, \cr{\cal A}_{C\!P}(B^+ \rightarrow K^{+} \mu^+ \mu^-) = \phantom{-}0.012 \pm 0.017 \pm 0.001, \end{align} where the first uncertainties are statistical and the second are due to systematic effects. Both measurements are consistent with the Standard Model prediction of small $C\!P$ asymmetry in these decays.

The direct $C\!P$ asymmetries of the decays $B^0 \rightarrow K^{*0} \mu^+\mu^-$ and $B^+ \rightarrow K^{+} \mu^+ \mu^-$ are measured using $pp$ collision data corresponding to an integrated luminosity of 3.0$\mbox{fb}^{-1}$ collected with the LHCb detector. The respective control modes $B^0 \rightarrow J/\psi K^{*0}$ and $B^+ \rightarrow J/\psi K^{+}$ are used to account for detection and production asymmetries. The measurements are made in several intervals of $\mu^+ \mu^-$ invariant mass squared, with the $\phi(1020)$ and charmonium resonance regions excluded. Under the hypothesis of zero $C\!P$ asymmetry in the control modes, the average values of the asymmetries are \begin{align}{\cal A}_{C\!P}(B^0 \rightarrow K^{*0} \mu^+ \mu^-) = -0.035 \pm 0.024 \pm 0.003, \cr{\cal A}_{C\!P}(B^+ \rightarrow K^{+} \mu^+ \mu^-) = \phantom{-}0.012 \pm 0.017 \pm 0.001, \end{align} where the first uncertainties are statistical and the second are due to systematic effects. Both measurements are consistent with the Standard Model prediction of small $C\!P$ asymmetry in these decays.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English August 2014 24 Feb 2015 12:01 05 Apr 2016 19:03 Springer 1029-8479 https://doi.org/10.1007/JHEP09(2014)177
Permanent URL: https://doi.org/10.5167/uzh-108209

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