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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Study of B 0 → ρ±π∓ time-dependent CP violation at Belle

Wang C. C., Abe K., Abe K., Abe T., Adachi I., Aihara H., Asano Y., Aushev T., Bakich A. M., Ban Y., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen K. F., Chen W. T., Cheon B. C., Choi S. K., Choi Y., Chuvikov A., Cole S., Dash M., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Eiges V., Gershon T., Gokhroo G., Guo R., Haba J., 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., Ishino H., Itoh K., Itoh R., Iwasaki H., Iwasaki Y., Kakuno H., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kinoshita K., Križan P., Krokovny P., Kumar S., Kwon Y. J., Lange J. S., Lee S. E., Lee Y. J., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyata H., Mizuk R., Mohapatra D., Mori T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okabe T.

We present a time-dependent analysis of CP violation in B 0→ rho;±π∓ decays based on a 140 fb -1 data sample collected at the υ(4S) resonance with the Belle detector at KEKB. We obtain the charge asymmetry A CP ρπ = -0.16 ±0.10(stat) ±0.02(syst). An unbinned maximum-likelihood fit to the Δt distributions yields C ρπ = 0.25 ± 0.17(stat) -0.02 +0.02(syst), ΔC ρπ = 0.38 ±0.18(stat) -0.04 +0.02(syst), S ρπ = -0.28 ±0.23(stat) -0.08 +0.10(syst), and ΔS ρπ = -0.30 ±0.24(stat) ±0.09(syst). The direct CP violation parameters for B→ρ +π -B→ρ -π + decays are A ρπ +- = -0.02 ±0.16(stat) -0.02 +0.5(syst) and A ρπ -+ = -0.53 ±0.29(stat) -0.04 +0.9(syst). © 2005 The American Physical Society.