Measurement of CP violation in the phase space of $B^{\pm }\to K^{+}{K}^{-}{\pi }^{\pm }$ and $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ decays

Abstract

The charmless decays $B^{\pm }\to K^{+}{K}^{-}{\pi }^{\pm }$ and $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ are reconstructed in a data set, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$ of pp collisions at a center-of-mass energy of 7 TeV, collected by LHCb in 2011. The inclusive charge asymmetries of these modes are measured to be $A_{CP}(B^{\pm }\to K^{+}{K}^{-}{\pi }^{\pm })=-0.141\pm 0.040(stat)\pm 0.018(syst)\pm 0.007(J/\psi K^{\pm })$ and $A_{CP}(B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm })=0.117\pm 0.021(stat)\pm 0.009(syst)\pm 0.007(J/\psi K^{\pm })$, where the third uncertainty is due to the CP asymmetry of the $B^{\pm }\to J/\psi K^{\pm }$ reference mode. In addition to the inclusive CP asymmetries, larger asymmetries are observed in localized regions of phase space.

9 pages, 3 figures

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