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Evidence for Isospin Violation and Measurement of CP Asymmetries in B -˃ K*(892)gamma

Title
Evidence for Isospin Violation and Measurement of CP Asymmetries in B -˃ K*(892)gamma
Author
천병구
Keywords
K-ASTERISK-GAMMA; TO-LEADING ORDER; DECAYS; ANNIHILATION; SYMMETRY; BREAKING
Issue Date
2017-11
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 119, no. 19, Article no. 191802
Abstract
We report the first evidence for isospin violation in B -> K*gamma and the first measurement of the difference of CP asymmetries between B+->.K*(+)gamma and B-0 -> K-*0 gamma. This analysis is based on the data sample containing 772 x 10(6)BB pairs that was collected with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We find evidence for the isospin violation with a significance of 3.1 sigma, Delta(0+) = [+6.2 +/- 1.5(stat) +/- 0.6(syst) +/- 1.2(f (+-)/f(00))] %, where the third uncertainty is due to the uncertainty on the fraction of B+B- to (BB0)-B-0 production in gamma(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is Delta A(CP) = [+2.4 +/- 2.8(stat) +/- 0.5(syst)] %, consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. We also calculate the ratio of branching fractions of B-0 -> K-*0 gamma to B-s(0) -> phi gamma.
URI
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.191802https://repository.hanyang.ac.kr/handle/20.500.11754/116238
ISSN
0031-9007; 1079-7114
DOI
10.1103/PhysRevLett.119.191802
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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