Search for CP violation in the decays D(s)+ --> KS0pi+ and D(s)+ --> KS0K+.

Ko B R,Won E,Aihara H,Aulchenko V,Aushev T,Bakich A M,Balagura V,Barberio E,Belous K,Bhardwaj V,Bischofberger M,Bozek A,Bracko M,Browder T E,Chang P,Chen A,Chen P,Cheon B G,Cho I-S,Choi Y,Dalseno J,Das A,Dolezal Z,Drutskoy A,Eidelman S,Goldenzweig P,Golob B,Ha H,Hara T,Hayashii H,Horii Y,Hoshi Y,Hou W-S,Hsiung Y B,Hyun H J,Iijima T,Inami K,Itoh R,Iwabuchi M,Iwasaki M,Joshi N J,Kah D H,Kang J H,Kapusta P,Katayama N,Kawasaki T,Kim H O,Kim Y J,Korpar S,Krizan P,Krokovny P,Kuhr T,Kumita T,Kwon Y-J,Kyeong S-H,Lange J S,Lee M J,Lee S-H,Li J,Liu C,Liu Y,Liventsev D,Louvot R,Matyja A,McOnie S,Miyata H,Mizuk R,Nakano E,Nakao M,Natkaniec Z,Neubauer S,Nishida S,Nitoh O,Ogawa S,Ohshima T,Okuno S,Olsen S L,Ostrowicz W,Pakhlov P,Pakhlova G,Palka H,Park C W,Park H,Park H K,Pestotnik R,Petric M,Piilonen L E,Röhrken M,Ryu S,Sahoo H,Sakai Y,Schneider O,Schwanda C,Schwartz A J,Seidl R,Senyo K,Sevior M E,Shapkin M,Shebalin V,Shen C P,Shiu J-G,Singh J B,Smerkol P,Sokolov A,Solovieva E,Stanic S,Staric M,Sumiyoshi T,Tanaka M,Taylor G N,Teramoto Y,Trabelsi K,Uehara S,Unno Y,Uno S,Varner G,Varvell K E,Vervink K,Wang C H,Wang M-Z,Wang P,Watanabe M,Watanabe Y,Yabsley B D,Yamashita Y,Yamauchi M,Zhang Z P,Zhilich V,Zivko T,Zupanc A,Zyukova O, Null Null

Physical review letters（2010）

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Abstract

We have searched for CP violation in the charmed meson decays D((s))(+) --> K(S)(0)pi(+) and D((s))(+) --> K(S)(0)K(+) using 673 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No evidence for CP violation is observed. We report the most sensitive CP asymmetry measurements to date for these decays: A(CP)(D(+)-->K(S)(0)pi(+)) = (-0.71 +/- 0.19 +/- 0.20)%, A(CP)(D(s)(+) --> K(S)(0)pi(+)) = (+5.45 +/- 2.50 +/- 0.33)%, A(CP)(D(+) --> K(S)(0)K(+)) = (-0.16 +/- 0.58 +/- 0.25)%, and A(CP)(D(s)(+) --> K(S)(0)K(+)) = (+0.12 +/- 0.36 +/- 0.22)%, where the first uncertainties are statistical and the second are systematic.

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