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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2006, vol. 74, p. -

Observation of B±→χc1π± and search for direct CP violation

Kumar R., Singh J. B., Abe K., Abe K., Aihara H., Anipko D., Aushev T., Aziz T., Bakich A. M., Balagura V., Barbero M., Bay A., Bedny I., Belous K., Bitenc U., Blyth S., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Cole S., Dalseno J., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Gorišek A., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Itoh R., Iwasaki Y., Kang J. H., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kinoshita K., Krokovny P., Kuo C. C., Kwon Y. J., Leder G., Lin S. W., Liventsev D., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Mueller J., Nakano E., Nakao M., Nishida S., Nitoh O., Noguchi S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park H., Park K. S., Pestotnik R., Piilonen L. E., Sakai Y., Schietinger T.

We report the first observation of B±→χc1π±, a Cabibbo- and color-suppressed decay in a data sample of 386×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 55±10 signal events with a statistical significance of 6.3σ including systematic uncertainties. The measured branching fraction and charge-asymmetry is B(B±→χc1π ±)=(2.2±0.4±0.3)×10-5 and Aπ=0.07±0. 18±0.02, respectively. We also determine the ratio B(B±→χ c1π±)/B(B±→χc1K±)=(4.3±0.8±0.3)%. © 2006 The American Physical Society.