Measurement of CP asymmetries in D⁰ → hh decays

2016/12/15 by E. Gersabeck, Gersabeck, Evelina
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.1612.05118

openalex publication_date 2016/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The latest measurements of the individual time-integrated CP asymmetry in the Cabibbo-suppressed decays D⁰→ hh decays are presented. The results are based on pp collision data, corresponding to an integrated luminosity of 3 fb^-1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. A combination of the asymmetries using both prompt and secondary charm decays is presented A_CP(K^-K⁺) = (0.04 ± 0.12(stat) ± 0.10(syst))%; A_CP(π^-π⁺) = (0.07 ± 0.14(stat) ± 0.11(syst)). These are the most precise measurements from a single experiment. The result for A_CP(K^-K⁺) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

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