Measurement of the branching fraction and asymmetry in decays, and an improved constraint on

Julius, T.*; Tanida, Kiyoshi ; Belle Collaboration*; 184 of others*

We measure the branching fraction and -violating asymmetry in the decay , using a data sample of pairs collected at the resonance with the Belle detector at the KEKB collider. The obtained branching fraction and direct asymmetry are $B(B^0 to pi^0pi^0)=[1.31 pm 0.19 ({rm stat.}) pm 0.18 ({rm syst.})]times10^{-6}$ and $A_{CP}= 0.14 pm 0.36 ({rm stat.}) pm 0.12 ({rm syst.})$ , respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle's earlier measurements of and $B^{pm} to pi^{pm}pi^0$ to exclude the -violating parameter from the range $15.5^{circ} < phi_2 < 75^{circ}$ at 95% confidence.

Language	:	English
Journal	:	Physical Review D
Volume	:	96
Number	:	3
Pages	:	p.032007_1 - 032007_8
Publication Year/Month	:	2017/08
Meeting title	:
Held date	:
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Patent information	:
PDF	:	AA2017-0467.pdf:0.32MB
Paper URL	:	https://doi.org/10.1103/PhysRevD.96.032007
DOI for research data	:
Keywords	:	CP非対称性
Research Facility	:
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20170467
JAEA Abstracts No. : 46000152
Paper Submission No. : 19781

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