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Observation of the radiative decay D0-->phigamma |
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| Authors: | Tajima O Abe K Abe K Aihara H Akatsu M Aulchenko V Aushev T Bakich A M Bay A Bizjak I Bondar A Bozek A Bracko M Browder T E Chao Y Cheon B G Chistov R Choi Y Choi Y K Chuvikov A Danilov M Dong L Y Eidelman S Eiges V Fang F Gabyshev N Garmash A Gershon T Gokhroo G Haba J Hagner C Handa F Hasuko K Hazumi M Higuchi I Hokuue T Hoshi Y Hou W-S Huang H-C Iijima T Inami K Ishikawa A Itoh R Iwasaki Y Kang J H Kang J S Kapusta P Katayama N Kawai H Kichimi H Kim H J Kim Hyunwoo Kim J H Kim S K Kinoshita K Koppenburg P Korpar S Krizan P Krokovny P Kuzmin A Kwon Y-J Lange J S Leder G Lee S H Lesiak T |
| Affiliation: | Tohoku University, Sendai. |
| Abstract: | We report the observation of the decay D0-->phigamma with a statistical significance of 5.4sigma in 78.1 fb(-1) of data collected by the Belle experiment at the KEKB e+e- collider. This is the first observation of a flavor-changing radiative decay of a charmed meson. The Cabibbo- and color-suppressed decays D0-->phipi(0), phieta are also observed for the first time. We measure branching fractions B(D0-->phigamma)=[2.60(+0.70)(-0.61)(stat)+0.15-0.17(syst)] x 10(-5), B(D0-->phipi(0))=[8.01+/-0.26(stat)+/-0.47(syst)] x 10(-4), and B(D0-->phieta)=[1.48+/-0.47(stat)+/-0.09(syst)] x 10(-4). |
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