# Measurement of the semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing

Abstract : The semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing, $a_{\rm sl}^d$, is measured in proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb experiment. Semileptonic $B^0$ decays are reconstructed in the inclusive final states $D^-\mu^+$ and $D^{*-}\mu^+$, where the $D^-$ meson decays into the $K^+\pi^-\pi^-$ final state, and the $D^{*-}$ meson into the $\overline{D}{}^0(\rightarrow K^+\pi^-)\pi^-$ final state. The asymmetry between the numbers of $D^{(*)-}\mu^+$ and $D^{(*)+}\mu^-$ decays is measured as a function of the decay time of the $B^0$ mesons. The $CP$ asymmetry is measured to be $a_{\rm sl}^d = (-0.02 \pm 0.19 \pm 0.30)\%$, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of $a_{\rm sl}^d$ to date and is consistent with the prediction from the Standard Model.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01070321
Contributor : Danielle Cristofol Connect in order to contact the contributor
Submitted on : Wednesday, October 1, 2014 - 10:00:06 AM
Last modification on : Thursday, December 16, 2021 - 2:11:16 PM

### Citation

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Ziad Ajaltouni, et al.. Measurement of the semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing. Physical Review Letters, American Physical Society, 2015, 114 (4), pp.041601. ⟨10.1103/PhysRevLett.114.041601⟩. ⟨in2p3-01070321⟩

### Metrics

Les métriques sont temporairement indisponibles