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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

Observation of B±→ψ(2S)π± and search for direct CP violation

Bhardwaj V., Kumar R., Singh J. B., Adachi I., Aihara H., Arinstein K., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chen A., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Drutskoy A., Eidelman S., Goldenzweig P., Golob B., Ha H., Hara T., Hayasaka K., Hayashii H., Hazumi M., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Joshi N. J., Kah D. H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lin S. W., Liu C., Liu Y., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nagasaka Y., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P.

We report the first observation of B±→ψ(2S)π±, a Cabibbo- and color-suppressed decay. This analysis is based on 657×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. The measured branching fraction is (2.44±0.22±0.20)×10-5 and the charge asymmetry is A=0.022±0.085±0.016. The ratio of the branching fractions B(B±→ψ(2S)π±)/B(B±→ψ(2S)K±)=(3. 99±0.36±0.17)% is also determined. © 2008 The American Physical Society.