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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Observation of Ds1(2536)+→D+π-K+ and angular decomposition of Ds1(2536)+→D*+KS0

Balagura V., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Barberio E., Bay A., Belous K., Bhardwaj V., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Garmash A., Golob B., Ha H., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kaji H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Liventsev D., Mandl F., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mohapatra D., Moloney G. R., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

Using 462fb-1 of e+e- annihilation data recorded by the Belle detector, we report the first observation of the decay Ds1(2536)+→D+π-K+. The ratio of branching fractions B(Ds1(2536)+→D+π-K+)B(Ds1(2536) +→D*+K0) is measured to be (3.27±0.18±0.37)%. We also study the angular distributions in the Ds1(2536)+→D*+KS0 decay and measure the ratio of D- and S-wave amplitudes. The S-wave dominates, with a partial width of ΓS/Γtotal=0.72±0.05±0.01. © 2008 The American Physical Society.