Measurement of the branching fraction and asymmetry in decays, and an improved constraint on
Journal Article
·
· Physical Review D
We measure the branching fraction and CP violation asymmetry in the decay B0 ! 00, using a data sample of 752 106 BB pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e collider. The obtained branching fraction and direct CP asymmetry are B(B !00) = [1:31 0:19 (stat.) 0:19 (syst.)] 106 and ACP = +0:14 0:36 (stat.) :10 (syst.); respectively. The signal signicance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of B0 ! + and B ! 0 to exclude the CP-violating parameter 2 from the range 15:5 < 2 < 75:0 at 95% condence level.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- Belle Collaboration
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1390427
- Report Number(s):
- PNNL-SA-128818; PRVDAQ; KA2201020
- Journal Information:
- Physical Review D, Vol. 96, Issue 3; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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