Department
Physics
Document Type
Article
Publication Date
8-2017
Embargo Period
7-3-2018
Abstract
We measure the branching fraction and CP violation asymmetry in the decay B0→π0π0, using a data sample of 752×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e− collider. The obtained branching fraction and direct CP asymmetry are B(B→π0π0)=[1.31±0.19(stat)±0.19(syst)]×10−6 and ACP=+0.14±0.36(stat)±0.10(syst), respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0→π+π− and B±→π±π0 to exclude the CP-violating parameter ϕ2 from the range 15.5°<ϕ2
Journal Title
Physical Review D
Journal ISSN
2470-0010
Volume
96
Issue
3
Digital Object Identifier (DOI)
10.1103/PhysRevD.96.032007
Comments
Preprint.