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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 92, p. 101803-1

Observation of the Radiative Decay D0→φγ

Tajima O., Abe K., Aihara H., Akatsu M., Aulchenko V., Aushev T., Bakich A. M., Bay A., Bizjak I., Bondar A., Bozek A., Bračko 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., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto H., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyata H., Mohapatra D., Moloney G. R., Nagamine T., Nagasaka Y., Nakano E., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Park C. W., Park K. S., Parslow N.

The observation of the decay D0 → φγ with a statistical significance of 5.4 σ in 78.1 fb-1 of data collected by the Belle experiment at the KEKB e+e- collider was discussed. It was the first observation of a flavor-changing radiative decay of a charmed meson. The Cabibbo- and color-suppressed decays D0 → φπ0, φν were studied. The estimated fractional systematic errors for the particle ID and MC statistics were also elaborated.