Search for direct $CP$ violation in charged charmless $B\to PV$ decays

Abstract

Measurements of $CP$ asymmetry in charmless $B\to PV$ decays are presented, where $P$ and $V$ denote a pseudoscalar and a vector meson, respectively. Five different $B\to PV$ decays from four final states, $B^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$, $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$, $B^{\pm }\to K^{\pm }{K}^{+}{K}^{-}$ and $B^{\pm }\to {\pi }^{\pm }{K}^{+}{K}^{-}$ are analyzed. The measurements are based on a method that does not require full amplitude analyses, and are performed using proton-proton collision data at a center-of-mass energy of 13 TeV collected by LHCb between 2015 and 2018, corresponding to an integrated luminosity of 5.9 fb${}^{-1}$. In the ${\pi }^{+}{\pi }^{-}$ $\text{P}$-wave, in the region dominated by the $B^{\pm }\to \rho (770{)}^0{K}^{\pm }$ decay, a $CP$ asymmetry of $\mbox{$A_{CP}$=+0.150$\pm$0.019$\pm$ 0.011}$ is measured, where the first uncertainty is statistical and the second is systematic. This is the first observation of $CP$ violation in this process. For the other four decay channels, in regions dominated by the $B^{\pm }\to \rho (770{)}^0{\pi }^{\pm }$, $B^{\pm }\to \stackrel{(-)}{K^{\ast }}(892{)}^0{\pi }^{\pm }$, $B^{\pm }\to \stackrel{(-)}{K^{\ast }}(892{)}^0{K}^{\pm }$ and $B^{\pm }\to \varphi (1020)K^{\pm }$ decays, $CP$ asymmetries in the $\text{P}$-wave compatible with zero are measured.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-050.html

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Cited by in corpus (1)

• Phenomenological analysis of charmless $B\to PV$ decays in the modified perturbative QCD approach