Measurement of the Direct CP Asymmetry in B¯→X(s+dγ) Decays with a Lepton Tag.

Pesántez L,Urquijo P,Dingfelder J,Abdesselam A,Adachi I,Adamczyk K,Aihara H,Al Said S,Arinstein K,Asner D M,Aulchenko V,Aushev T,Ayad R,Bahinipati S,Bakich A M,Bansal V,Barberio E,Bhardwaj V,Bhuyan B,Bobrov A, Bondar A,Bonvicini G,Bozek A,Bračko M,Browder T E,Červenkov D,Chekelian V,Chen A,Cheon B G,Chilikin K,Chistov R,Cho K,Chobanova V,Choi Y,Cinabro D,Dalseno J,Doležal Z,Drásal Z,Drutskoy A,Dutta D,Eidelman S,Farhat H,Fast J E,Ferber T,Frost O,Gaur V,Gabyshev N,Ganguly S,Garmash A,Getzkow D,Gillard R,Goh Y M,Golob B,Haba J,Hasenbusch J,Hayashii H,He X H,Heller A,Horiguchi T,Hou W-S,Huschle M,Iijima T,Inami K,Ishikawa A,Itoh R,Iwasaki Y,Jaegle I,Joffe D,Julius T,Kang K H,Kato E,Kawasaki T,Kiesling C,Kim D Y,Kim J B,Kim J H,Kim K T,Kim M J,Kim S H,Kim Y J,Ko B R,Kodyš P,Korpar S,Križan P,Krokovny P,Kronenbitter B,Kuhr T,Kumita T,Kuzmin A,Kwon Y-J,Lange J S,Lee I S,Li Y,Li Gioi L,Libby J,Liventsev D,Lukin P,Matvienko D,Miyabayashi K,Miyata H,Mizuk R,Mohanty G B,Moll A,Moon H K,Nakano E,Nakao M,Nanut T,Natkaniec Z,Nayak M,Ng C,Nisar N K,Nishida S,Ogawa S,Okuno S,Olsen S L,Oswald C,Pakhlov P,Pakhlova G,Park C W,Park H,Pedlar T K,Pestotnik R,Petrič M,Piilonen L E,Ribežl E,Ritter M,Rostomyan A,Rozanska M,Sakai Y,Sandilya S,Santelj L,Sanuki T,Sato Y,Savinov V,Schneider O,Schnell G,Schwanda C,Schwartz A J,Senyo K,Seon O,Sevior M E,Shebalin V,Shen C P,Shibata T-A,Shiu J-G,Shwartz B,Sibidanov A,Simon F,Sohn Y-S,Sokolov A,Solovieva E,Starič M,Steder M,Sumiyoshi T,Tamponi U,Taniguchi N,Tatishvili G,Teramoto Y,Trabelsi K,Uchida M,Uglov T,Unno Y,Uno S,Usov Y,Van Hulse C,Vanhoefer P,Varner G,Vinokurova A,Vorobyev V,Wagner M N,Wang B,Wang C H,Wang M-Z,Wang P,Watanabe Y,Williams K M,Won E, Yamaoka J,Yashchenko S,Yook Y,Zhang Z P,Zhilich V,Zhulanov V,Zupanc A, Null Null

Physical review letters（2015）

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摘要

We report the measurement of the direct CP asymmetry in the radiative B¯→X(s+dγ) decay using a data sample of (772 ± 11)×10(6) BB[over ¯] pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The CP asymmetry is measured as a function of the photon energy threshold. For Eγ*≥2.1 GeV, where Eγ* is the photon energy in the center-of-mass frame, we obtain A(CP)(B¯→X(s+dγ))=(2.2±3.9±0.9)%, consistent with the standard model prediction.

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