Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.051801
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS)
- Tau-Lepton Physics Research Center of Nagoya University
- Australian Research Council
- Austrian Science Fund
- National Natural Science Foundation of China
- Chinese Academy of Science Center for Excellence in Particle Physics
- Ministry of Education, Youth and Sports of the Czech Republic
- Carl Zeiss Foundation
- Deutsche Forschungsgemeinschaft
- Excellence Cluster Universe
- VolkswagenStiftung
- the Department of Science and Technology of India
- Istituto Nazionale di Fisica Nucleare of Italy
- WCU program of the Ministry of Education, National Research Foundation (NRF) of Korea
- Brain Korea 21-Plus program and Radiation Science Research Institute
- Polish Ministry of Science and Higher Education
- National Science Center
- Ministry of Education and Science of the Russian Federation
- Russian Foundation for Basic Research
- Slovenian Research Agency
- Ikerbasque, Basque Foundation for Science and the Euskal Herriko Unibertsitatea (UPV/EHU) (Spain)
- Swiss National Science Foundation
- Ministry of Education
- Ministry of Science and Technology of Taiwan
- DOE
- NSF (USA)
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We report the first observation of the radiative charm decay D-0 -> rho(0)gamma and the first search for CP violation in decays D-0 -> rho(0)gamma, phi gamma, and (K) over bar (*0)(892)gamma, using a data sample of 943 fb(-1) collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The branching fraction is measured to be B(D-0 -> rho(0)gamma) = (1.77 +/- 0.30 +/- 0.07) x 10(-5), where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries A(CP)(D-0 ->rho(0)gamma) = +0.056 +/- 0.152 +/- 0.006, A(CP)(D-0 -> phi gamma) = -0.094 +/- 0.066 +/- 0.001, and A(CP)(D-0 -> (K) over bar (*0) gamma = -0.003 +/- 0.020 +/- 0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D-0 -> phi gamma) = (2.76 +/- 0.19 +/- 0.10) x 10(-5) and B(D-0 -> (K) over bar (*0) gamma = (4.66 +/- 0.21 +/- 0.21) x 10(-4).
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