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Angular analysis of the e <sup>+</sup> e <sup>-</sup> → D <sup>(*)±</sup> D <sup>*∓</sup> process near the open charm threshold using initial-state radiation

Zhukova V., Pakhlova G., Pakhlov P., Adachi I., Aihara H., Al Said S., Asner D. M., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Behera P., Bhuyan B., Biswal J., Bobrov A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Cho K., Choi S. K., Choi Y., Cinabro D., Czank T., Dash N., Di Carlo S., DoleŽal Z., Drásal Z., Eidelman S., Farhat H., Fast J. E., Ferber T., Fulsom B. G., Gaur V., Garmash A., Gillard R., Goldenzweig P., Grzymkowska O., Guido E., Haba J., Hayasaka K., Hayashii H., Hedges M. T., Hou W. S., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jaegle I., Jeon H. B., Jia S., Jin Y., Julius T., Kang K. H., Karyan G., Kiesling C., Kim D. Y., Kim K. T., Kim S. H., Korpar S., Kotchetkov D., KriŽan P., Krokovny P., Kulasiri R., Kwon Y. J., Lange J. S., Li L., Li Gioi L., Liventsev D., Luo T., Masuda M., Matsuda T., Merola M., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Moon H. K., Mori T., Nakao M., Nanut T., Nath K. J., Nayak M., Niiyama M., Nisar N. K., Nishida S., Ogawa S., Olsen S. L., Ono H., Pal B., Park C. S.

© 2018 authors. Published by the American Physical Society. We report a new measurement of the exclusive e+e-→D(∗)±D∗ cross sections as a function of the center-of-mass energy from the D(∗)±D∗ threshold through s=6.0 GeV, using the initial-state radiation technique. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 951 fb-1. The accuracy of the cross section measurement is increased by a factor of 2 over the first Belle study. We perform the first angular analysis of the e+e-→D∗±D∗ process and decompose this exclusive cross section into three components corresponding to the D∗ helicities.