Observation of B^{0}→pΛ[over ¯]D^{(*)-}.

Chang Y-Y,Wang M-Z,Abdesselam A,Adachi I,Adamczyk K,Aihara H,Al Said S,Asner D M,Atmacan H,Aushev T,Babu V,Badhrees I,Bakich A M,Barberio E,Bhuyan B,Biswal J,Bobrov A,Bozek A,Bračko M,Browder T E,Červenkov D,Chekelian V,Chen A,Cheon B G,Chilikin K,Chistov R,Chobanova V,Choi S-K,Choi Y,Cinabro D,Dalseno J,Danilov M,Dingfelder J,Doležal Z,Drásal Z,Dutta D,Eidelman S,Farhat H,Fast J E,Ferber T,Fulsom B G,Gaur V,Gabyshev N,Ganguly S,Garmash A,Gillard R,Glattauer R,Goh Y M,Goldenzweig P,Greenwald D,Grzymkowska O,Haba J,Hayasaka K,Hayashii H,He X H,Hou W-S,Hsu C-L,Iijima T,Inami K,Ishikawa A,Itoh R,Iwasaki Y,Jacobs W W,Jaegle I,Joffe D,Joo K K,Kawasaki T,Kim D Y,Kim H J,Kim J B,Kim J H,Kim K T,Kim M J,Kim S H,Kim Y J,Kinoshita K,Korpar S,Križan P,Krokovny P,Kuhr T,Kumita T,Kuzmin A,Kwon Y-J,Lai Y-T,Lee I S,Li L,Li Y,Libby J,Liventsev D,Lukin P,Masuda M,Matvienko D,Miyabayashi K,Miyake H,Miyata H,Mizuk R,Mohanty G B,Mohanty S,Moll A,Moon H K,Mori T,Nakano E,Nakao M,Nanut T,Nayak M,Nishida S,Ogawa S,Ozaki H,Pakhlov P,Pakhlova G,Pal B,Park C W,Pedlar T K,Pestotnik R,Petrič M,Piilonen L E,Rauch J,Ribežl E,Ritter M,Rostomyan A,Ryu S,Sahoo H,Sakai Y,Sandilya S,Santelj L,Sanuki T,Savinov V,Schneider O,Schnell G,Schwanda C,Seino Y,Senyo K,Seong I S,Sevior M E,Shebalin V,Shen C P,Shibata T-A,Shiu J-G,Simon F,Sohn Y-S,Starič M,Stypula J,Sumihama M,Sumisawa K,Sumiyoshi T,Tamponi U,Tanida K,Teramoto Y,Uglov T,Unno Y,Uno S,Usov Y,Van Hulse C,Vanhoefer P,Varner G,Vorobyev V,Vossen A,Wagner M N,Wang C H,Wang P,Watanabe M,Watanabe Y,Williams K M,Won E,Yamaoka J,Yashchenko S,Yelton J,Yusa 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 first observation of the decays B-0 -> p (Lambda) over barD(*)(-). The data sample of 711 fb(-1) used in this analysis corresponds to 772 x 10(6) B (B) over bar pairs, collected at the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe 19.8 sigma and 10.8 sigma excesses of events for the two decay modes and measure the branching fractions of B-0 -> p (Lambda) over barD(-) and B-0 -> p (Lambda) over barD*(-) to be (25.1 +/- 2.6 +/- 3.5) x 10(-6) and (33.6 +/- 6.3 +/- 4.4) x 10(-6), respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (p (Lambda) over bar) system is observed, consistent with that observed in similar B decays.

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关键词

observation,over-bard

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