CP violation measurements in B mesons at Belle

11th International Conference on Hyperons, Charm and Beauty Hadrons

Drásal, Zbynk^1,1

Charles University in Prague, Praha

147 00, Czech Republic^1

关键词: Accurate measurement;    Belle detectors;    Branching ratio;    CP violations;    CP-violation parameters;    Measured values;    Measurements of;    Time-dependent CP asymmetry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/556/1/012037/pdf
DOI  :  10.1088/1742-6596/556/1/012037

来源: IOP

【 摘 要 】

We present recent measurements of time-dependent CP asymmetries in two neutral B decay modes: B0→ η'K0and B0→ ωK°S. The measured values of mixing-induced (sin 2φ1eff) and direct CP violation parameters are: Sη'Ko+0.68 ± 0.07stat± 0.03syst, Aη'K0+0.03 ± 0.05stat± 0.04systand SωK0S+0.91 ± 0.32stat± 0.05syst, AωK0S-0.36 ± 0.19stat± 0.05syst, respectively. These results are fully consistent with the current world average of sin 2φ1measured in b → cc¯s transitions, and represent the most accurate measurements in these modes up-to- date. In addition, we present a new preliminary update on branching ratio measurement in B0→ π0π0decay mode, the result of which: (B0→ π0π0) (0.90 ± 0.12stat± 0.10syst) × 10-6represents an important ingredient in a ππSU(2) isospin analysis, used to experimentally extract φ2angle from B → ππ measurements. To obtain CP violation parameters ((B0→ π0π0)) the final data set of 772 × 106(751.5 × 106) BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric e+e-collider in Japan (3.5 × 8.0GeV) is used.