Indirect \boldsymbolCP Violation in \boldsymbolD⁰ → h⁺ h^- Decays at LHCb

2015/01/26 by Alexander, Michael
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1501.06464

Abstract

Indirect CP violation in the D⁰ system can be probed by measuring the parameter A_Γ, defined as the CP asymmetry of the effective lifetime of the D⁰ meson decaying to a CP eigenstate. This can be significantly enhanced beyond Standard Model predictions by new physics. Measurements of A_Γ using D⁰ → K⁺K^- and D⁰→ π⁺π^- decays reconstructed from pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb^-1, are presented. The results are A_Γ (ππ) = (+0.33 ± 1.06 ± 0.14) × 10^-3, A_Γ (KK) = (-0.35 ± 0.62 ± 0.12) × 10^-3, where the uncertainties are statistical and systematic, respectively. These are the most precise measurements of their kind to date, and show no evidence of CP violation.

Related

• Searches for CP violation in two-body charm decays
• A search for time-integrated CP violation in D⁰ → h^-h⁺ decays
• Search for CP violation in D⁰ → h⁺h^- decays at CDF
• Indirect CP violation results and HFAG averages
• Measurements of A_CP(B⁰→ K⁺ π^-) and A_CP(B_s→ π⁺ K^-) at LHCb