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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 96, p. -

Evidence for large direct CP violation in B±→ρ(770) 0K± from analysis of three-body charmless B±→K±π ±π± decays

Garmash A., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Barbero M., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Chuvikov A., Dalseno J., Danilov M., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Ha H. C., Hara T., Hasegawa Y., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim S. K., Kim S. M., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liventsev D., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Nagamine T., Nakano E., Nakao M.

We report results on a Dalitz analysis of three-body charmless B±→K±π±π decay including searches for direct CP violation. We report the first observation of the decay B±→f2(1270) K± with a statistical significance above 6σ. We also observe first evidence for large direct CP violation in the B±→ρ(770) 0K± channel. The results are obtained with a data sample that contains 386×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. © 2006 The American Physical Society.