Measurement of CP-violating parameters in B -> eta ' K decays

K F Chen,K Hara,K Abe,Tomoyuki Abe,I Adachi,Byoung Sup Ahn,H Aihara,M Akatsu,Y Asano,T Aso, Aulchenko,T Aushev, A M Bakich,Y Ban,A Bay,I Bedny,P K Behera,I Bizjak,A Bondar,A Bozek,M Bracko,J Brodzicka,T E Browder,Bck Casey,Paoti Chang,Yuan Chao,B G Cheon,R Chistov,S K Choi,Y K Choi,M Danilov,L Y Dong,J Dragic,S Eidelman, Eiges,Y Enari,Fang Fang,C Fukunaga,N Gabyshev,A Garmash,T Gershon,B Golob,A Gordon,Rui Guo,J Haba,K Hanagaki,F Handa,Toshiro Hara,N C Hastings,H Hayashii,M Hazumi,E M Heenan,I Higuchi,T Higuchi,L Hinz,Y Hoshi,W S Hou,Y B Hsiung,S C Hsu,H C Huang,T Igaki,Y Igarashi,T Iijima,K Inami,A Ishikawa,R Itoh,H Iwasaki,Y Iwasaki,H K Jang,J H Kang,Naoyuki Katayama, Hidetoshi Kawai,Yutaka Kawakami,N Kawamura,H Kichimi,D W Kim,H J Kim,T H Kim,K Kinoshita,S Korpar, P Krizan,P Krokovny,R Kulasiri,S Kumar,A Kuzmin,Y J Kwon,J S Lange,G Leder,S H Lee,J Li,R S Lu,J Macnaughton,G Majumder,F Mandl,D Marlow,Toyojiro Matsuishi,S Matsumoto,Takeshi Matsumoto,K Miyabayashi, Y Miyabayashi,H Miyata,G R Moloney,Takeo Mori,Akira Murakami,T Nagamine,Y Nagasaka,T Nakadaira,E Nakano,M Nakao,J W Nam,Z Natkaniec,S Nishida,O Nitoh,S Noguchi, Shiro Ogawa,T Ohshima,T Okabe,S Okuno,S L Olsen,Y Onuki,W Ostrowicz,Hiroshi Ozaki,H Palka,C W Park,Hongkyu Park,L S Peak,J P Perroud,M Peters,L E Piilonen,N Root,M Rozanska,K Rybicki,H Sagawa,Satoshi Saitoh,Y Sakai,H Sakamoto,M Satapathy,A Satpathy,O Schneider,S Schrenk,C Schwanda,S Semenov,K Senyo,R Seuster,M E Sevior,H Shibuya,B Shwartz,J B Singh,N Soni,S Stanic,M Staric,A Sugi,A Sugiyama,K Sumisawa,T Sumiyoshi,S Suzuki,Tadayuki Takahashi,F Takasaki,Noriko Tamura,Junichi Tanaka,Masashi Tanaka,G N Taylor,Y Teramoto,S Tokuda,M Tomoto,T Tomura,K Trabelsi,W Trischuk,T Tsuboyama,T Tsukamoto,S Uehara,Keiji Ueno,Y Unno,S Uno,Y Ushiroda,G Varner,K E Varvell,C H Wang, J G Wang,M Z Wang,Yasuyoshi Watanabe,E Won,B D Yabsley,Yasuhiro Yamada,Atsushi Yamaguchi,Y Yamashita,Makoto Yamauchi,Hideyuki Yanai,Penshu Yeh, Akiko Yokoyama, Yuhong Yuan,Y Yusa, Z P Zhang, Zhilich,D Zontar

Physics Letters B（2002）

Cited 23|Views158

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Abstract

We present measurements of CP-violating parameters in B-0 ((B) over bar (0)) --\u003e eta\u0027K-S(0) and B+/- --\u003e eta\u0027K+/- decays based on a 41.8 fb(-1) data sample collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We fully reconstruct one neutral B meson as a B-0((B) over bar (0)) --\u003e eta\u0027K-S(0) CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of proper time intervals between pairs of B meson decay points, we obtain the CP-violating asymmetry parameters S-eta\u0027KS(0) = 0.28+/-0.55(stat)(-0.08)(+0.07)(syst), and A(eta\u0027KS)(0) = 0.13+/-0.32(stat)(-0.06)(+0.09)(syst). We also reconstruct charged B+/- --\u003e eta\u0027K+/- decays and determine a direct- CP-violating asymmetry value of A(eta\u0027K)(+/-) = (-1.5+/-7.0(stat) +/- 0.9(syst))%.(C) 2002 Elsevier Science B.V. All rights reserved.

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Key words

k,system,cp violation,parametrization

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