Observation of D+ → K(+)η(') and search for CP violation in D+ → π(+)η(') decays.

Won E, Ko B R,Adachi I,Aihara H, Arinstein K, Asner D M,Aushev T, Bakich A M,Barberio E, Bay A,Bhardwaj V,Bhuyan B, Bischofberger M, Bondar A,Bozek A, Bračko M,Brodzicka J,Browder T E,Chang P,Chen A,Chen P, Cheon B G, Chilikin K,Cho I-S,Cho K,Choi S-K,Choi Y,Dalseno J, Danilov M,Doležal Z,Drásal Z,Drutskoy A, Eidelman S, Fast J E,Gaur V,Gabyshev N,Garmash A,Goh Y M,Golob B,Haba J,Hara T,Hayasaka K, Hayashii H,Horii Y,Hoshi Y,Hou W-S,Hsiung Y B, Hyun H J,Iijima T,Inami K,Ishikawa A,Itoh R, Iwabuchi M,Iwasaki Y,Iwashita T,Joshi N J,Julius T,Kang J H,Katayama N,Kawasaki T,Kichimi H,Kim H J,Kim H O,Kim J B,Kim J H,Kim K T,Kim M J,Kim S K,Kim Y J,Kinoshita K,Kobayashi N,Koblitz S,Kodyš P,Korpar S,Križan P,Kumita T,Kuzmin A,Kwon Y-J, Lange J S, Lee M J,Lee S-H,Li J,Li Y,Libby J,Lim C-L,Liu C,Liu Y,Liventsev D, Louvot R, McOnie S,Miyabayashi K,Miyata H,Miyazaki Y,Mizuk R, Mohanty G B,Nagasaka Y, Nakano E, Nakao M, Nakazawa H,Natkaniec Z,Neubauer S,Nishida S,Nishimura K,Nitoh O,Ogawa S,Ohshima T, Okuno S,Olsen S L,Onuki Y,Pakhlov P,Pakhlova G,Park H,Park H K,Park K S, Pestotnik R, Petrič M,Piilonen L E, Röhrken M, Ryu S, Sahoo H,Sakai K,Sakai Y,Sanuki T,Schneider O,Schwanda C,Schwartz A J,Senyo K,Seon O, Sevior M E, Shen C P,Shibata T-A,Shiu J-G,Simon F,Singh J B, Smerkol P,Sohn Y-S,Sokolov A, Solovieva E, Stanič S, Starič M, Sumihama M, Sumiyoshi T,Suzuki S,Tatishvili G,Teramoto Y,Trabelsi K, Uchida M, Uehara S,Uglov T, Unno Y,Uno S,Usov Y, Vahsen S E, Varner G, Vinokurova A,Wang C H,Wang M-Z,Wang P, Watanabe M,Watanabe Y,Williams K M, Yabsley B D,Yamashita Y,Yamauchi M,Zhang Z P,Zhilich V, Zhulanov V, Zupanc A, Zyukova O, Null Null

Physical review letters（2011）

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摘要

We report the first observation of the doubly Cabibbo-suppressed decays D(+)→K(+)η((')) using a 791 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The ratio of the branching fractions of doubly Cabibbo-suppressed relative to singly Cabibbo-suppressed D(+)→π(+)η((')) decays are B(D(+)→K(+)η)/B(D(+)→π(+)η)=(3.06±0.43±0.14)% and B(D(+)→K(+)η')/B(D(+)→π(+)η')=(3.77±0.39±0.10)%. From these, we find that the relative final-state phase difference between the tree and annihilation amplitudes in D(+) decays, δ(TA), is (72±9)° or (288±9)°. We also report the most precise measurements of CP asymmetries to date: A(CP)(D(+)→π(+)η)=(+1.74±1.13±0.19)% and A(CP)(D(+)→π(+)η')=(-0.12±1.12±0.17)%.

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