Measurement of CP asymmetries in \kern 0.18em\kern -0.18em B⁰ → D_s^- D⁺ and \kern 0.18em\kern -0.18em B_s⁰ → D_s⁺ D^- decays

2026/03/30 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1190 · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf

Abstract

Measurements of the combined CP asymmetries in \kern 0.18em\kern -0.18em B⁰ → D_s^- D⁺ and \kern 0.18em\kern -0.18em B_s⁰ → D_s⁺ D^- decays are made using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9fb^-1. The measurements are found to be \beginaligned A_CP(\kern 0.18em\kern -0.18em B⁰ → D_s^- D⁺) &= 0.0009 ± 0.0053 ± 0.0040, A_CP(\kern 0.18em\kern -0.18em B_s⁰ → D_s⁺ D^-) &= 0.103\phantom0 ± 0.053\phantom0 ± 0.010, \endaligned where the first and second uncertainties are statistical and systematic, respectively. This is the first measurement of this asymmetry in \kern 0.18em\kern -0.18em B_s⁰ decays, and the most precise measurement to date for \kern 0.18em\kern -0.18em B⁰ decays. Both measurements are found to be consistent with CP symmetry.

Citations

• The LHCb Stripping Project: Sustainable Legacy Data Processing for High-Energy Physics
• Geant4 developments and applications

Discussions

• Measurement of CP asymmetries in B̅⁰→Dₛ⁻D⁺ and B̅⁰ₛ→Dₛ⁺D⁻ decays - The measurements are found to be ACP(B̅⁰→Dₛ⁻D⁺) = 0.0009±0.0053±0.0040, ACP(B̅⁰ₛ→Dₛ⁺D⁻ ) = 0.103±0.053±0.010, This is the first measu [bsky, 4 points, 0 comments]

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