Measurement of the CP asymmetry in B-->Xs gamma.
作者信息
Nishida S, Abe K, Abe K, Abe T, Aihara H, Asano Y, Aushev T, Bahinipati S, Bakich A M, Ban Y, Banas E, Bay A, Bitenc U, Bizjak I, Blyth S, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T E, Chang M-C, Chang P, Chen K-F, Cheon B G, Chistov R, Choi S-K, Choi Y, Chuvikov A, Cole S, Danilov M, Dash M, Dong L Y, Dragic J, Eidelman S, Eiges V, Enari Y, Epifanov D, Fang F, Fratina S, Garmash A, Gershon T, Gokhroo G, Golob B, Haba J, Hara T, Hastings N C, Hayashii H, Hazumi M, Higuchi T, Hinz L, Hoshi Y, Hou W-S, Hsiung Y B, Iijima T, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki M, Iwasaki Y, Kang J H, Kang J S, Kapusta P, Kataoka S U, Katayama N, Kawasaki T, Kichimi H, Kim H J, Kim S K, Kim T H, Koppenburg P, Korpar S, Krizan P, Krokovny P, Kuzmin A, Kwon Y-J, Lange J S, Leder G, Lee S E, Lee S H, Li J, Lin S-W, MacNaughton J, Majumder G, Mandl F, Matsumoto T, Matyja A, Mitaroff W, Miyake H, Mizuk R, Mohapatra D, Moloney G R, Murakami A, Nagamine T, Nagasaka Y, Nakano E, Nakao M, Nakazawa H, Natkaniec Z, Nitoh O, Nozaki T, Ogawa S, Ohshima T, Okabe T, Okuno S, Olsen S L, Ozaki H, Pakhlov P, Palka H, Park C W, Park H, Peters M, Piilonen L E, Ronga F J, Rozanska M, Sakai Y, Schneider O, Schümann J, Schwanda C, Semenov S, Seuster R, Sevior M E, Shibuya H, Shwartz B, Somov A, Soni N, Stamen R, Stanic S, Staric M, Sugiyama A, Sumiyoshi T, Suzuki S, Tajima O, Takasaki F, Tamai K, Tanaka M, Teramoto Y, Tomura T, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Uglov T, Ueno K, Unno Y, Uno S, Ushiroda Y, Varner G, Varvell K E, Wang C H, Wang M-Z, Watanabe Y, Yabsley B D, Yamada Y, Yamaguchi A, Yamashita Y, Yamauchi M, Yang Heyoung, Ying J, Zhang Z P, Zhilich V, Ziegler T, Zontar D, Zürcher D
机构信息
High Energy Accelerator Research Organization (KEK), Tsukuba.
出版信息
Phys Rev Lett. 2004 Jul 16;93(3):031803. doi: 10.1103/PhysRevLett.93.031803.
Direct CP violation in the b-->sgamma process is a sensitive probe of physics beyond the standard model. We report a measurement of the CP asymmetry in B-->X(s)gamma, where the hadronic recoil system X(s) is reconstructed using a pseudoreconstruction technique. In this approach there is negligible contamination from b-->dgamma decays, which are expected to have a much larger CP asymmetry. We find A(CP)=0.002+/-0.050(stat)+/-0.030(syst) for B-->X(s)gamma events having recoil mass smaller than 2.1 GeV/c(2). The analysis is based on a data sample of 140 fb(-1) recorded at the upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) storage ring.
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