Observation of D0 â†’Ï 0γ and Search for CP Violation in Radiative Charm Decays

Date Issued
31-01-2017
Author(s)
Nanut, T.
Zupanc, A.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Aulchenko, V.
Aushev, T.
Ayad, R.
Babu, V.
Badhrees, I.
Bakich, A. M.
Bansal, V.
Behera, P.
Bhardwaj, V.
Biswal, J.
Bondar, A.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
ÄŒervenkov, D.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chistov, R.
Cho, K.
Choi, S. K.
Choi, Y.
Cinabro, D.
Dash, N.
Di Carlo, S.
DoleŽal, Z.
Dutta, D.
Eidelman, S.
Farhat, H.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Gaur, V.
Gabyshev, N.
Garmash, A.
Gillard, R.
Goldenzweig, P.
Golob, B.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Iwasaki, Y.
Jacobs, W. W.
Jaegle, I.
Joffe, D.
Joo, K. K.
Julius, T.
Kaliyar, A. B.
Kang, K. H.
Kawasaki, T.
Kim, D. Y.
Kim, J. B.
Kim, K. T.
Kim, M. J.
Kim, S. H.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Krokovny, P.
Kuhr, T.
Kulasiri, R.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Lee, I. S.
Li, C. H.
Li, L.
Li, Y.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Lubej, M.
Masuda, M.
Matsuda, T.
Matvienko, D.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
Mohanty, G. B.
Moon, H. K.
Nakao, M.
Nath, K. J.
Nayak, M.
Nisar, N. K.
Nishida, S.
Ogawa, S.
Okuno, S.
Pakhlov, P.
Pakhlova, G.
Pal, B.
DOI
Abstract
We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, φγ, and K̄∗0(892)γ, 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(D0→ρ0γ)=(1.77±0.30±0.07)×10-5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→φγ)=-0.094±0.066±0.001, and ACP(D0→K̄∗0γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→φγ)=(2.76±0.19±0.10)×10-5 and B(D0→K̄∗0γ)=(4.66±0.21±0.21)×10-4.
Volume
118