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Measurement of the branching fraction and CP asymmetry in B-0 -˃ pi(0)pi(0) decays, and an improved constraint on phi(2)

Title
Measurement of the branching fraction and CP asymmetry in B-0 -˃ pi(0)pi(0) decays, and an improved constraint on phi(2)
Author
천병구
Keywords
BELLE; VIOLATION; DETECTOR
Issue Date
2017-08
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v. 96, no. 3, Article no. 032007
Abstract
We measure the branching fraction and CP violation asymmetry in the decay B-0 -> pi(0)pi(0), using a data sample of 752 x 10(6) B (B) over bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The obtained branching fraction and direct CP asymmetry are B(B -> pi(0)pi(0)) = [1.31 +/- 0.19(stat) +/- 0.19(syst)] x 10(-6) and A(CP) = +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 B-0 -> pi(+)pi(-) and B-+/- -> pi(+/-)pi(0) to exclude the CP-violating parameter phi(2) from the range 15.5 degrees < phi(2) < 75.0 degrees at 95% confidence level.
URI
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.96.032007https://repository.hanyang.ac.kr/handle/20.500.11754/115070
ISSN
2470-0010; 2470-0029
DOI
10.1103/PhysRevD.96.032007
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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