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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2006, vol. 634, p. 155-164

Measurement of branching fractions for B → χc1(2)K (K*) at Belle

Soni N., Abe K., Abe K., Adachi I., Aihara H., Arinstein K., Asano Y., Aulchenko V., Aushev T., Bakich A. M., Barberio E., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Dalseno J., Danilov M., Dash M., Dong L. Y., Eidelman S., Enari Y., Epifanov D., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Lesiak T., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., Mikami Y., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mohapatra D., Nagamine T., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T.

We have measured the branching fractions for the exclusive decay modes B→χc1(2)K(K*) using a 140 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e +e- collider. The measured branching fractions for B +→χc1K+, B0→χ c1K0, B0→χc1K* 0 and B+→χc1K*+ decay modes are (4.5±0.2±0.5)×10-4, (3.5±0.3±0.5)×10-4, (3.1±0.3±0.7) ×10-4 and (4.1±0.6±0.9)×10-4, respectively, where the first error is statistical and the second error is systematic. We do not observe statistically significant signals for the B→χc2K(K*) decay modes and set upper limits at the 90% confidence level. We also study the helicity distribution for B→χc1K* decay mode and show that the longitudinal polarization component is dominant. © 2006 Elsevier B.V. All rights reserved.