Measurement of the time-dependent CP-violating asymmetry in B(0)-->K(0)(S)pi(0)gamma decays

Y Ushiroda; K Sumisawa; M Hazumi; K Abe; K Abe; I Adachi; H Aihara; Y Asano; V Aulchenko; T Aushev; A M Bakich; A Bay; I Bedny; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; M-C Chang; P Chang; Y Chao; A Chen; K-F Chen; W T Chen; B G Cheon; S-K Choi; Y Choi; A Chuvikov; S Cole; J Dalseno; M Danilov; M Dash; J Dragic; S Eidelman; F Fang; S Fratina; N Gabyshev; T Gershon; G Gokhroo; A Gorisek; J Haba; K Hara; N C Hastings; K Hayasaka; H Hayashii; T Higuchi; L Hinz; T Hokuue; Y Hoshi; S Hou; W-S Hou; Y B Hsiung; T Iijima; A Imoto; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwasaki; Y Iwasaki; J H Kang; J S Kang; P Kapusta; N Katayama; H Kawai; T Kawasaki; H R Khan; H Kichimi; H J Kim; S M Kim; K Kinoshita; P Krizan; P Krokovny; S Kumar; C C Kuo; A Kusaka; A Kuzmin; Y-J Kwon; G Leder; T Lesiak; J Li; A Limosani; S-W Lin; D Liventsev; F Mandl; T Matsumoto; Y Mikami; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; D Mohapatra; G R Moloney; T Nagamine; E Nakano; M Nakao; S Nishida; O Nitoh; T Nozaki; S Ogawa; T Ohshima; T Okabe; S Okuno; S L Olsen; W Ostrowicz; H Ozaki; P Pakhlov; H Palka; C W Park; N Parslow; L S Peak; R Pestotnik; L E Piilonen; H Sagawa; Y Sakai; N Sato; T Schietinger; O Schneider; A J Schwartz; K Senyo; M E Sevior; T Shibata; H Shibuya; J B Singh; A Somov; N Soni; R Stamen; S Stanic; M Staric; T Sumiyoshi; S Suzuki; O Tajima; F Takasaki; K Tamai; N Tamura; M Tanaka; Y Teramoto; X C Tian; K Trabelsi; T Tsuboyama; T Tsukamoto; S Uehara; T Uglov; S Uno; P Urquijo; G Varner; K E Varvell; S Villa; C C Wang; C H Wang; M Watanabe; Y Watanabe; Q L Xie; A Yamaguchi; Y Yamashita; M Yamauchi; Heyoung Yang; J Ying; J Zhang; L M Zhang; Z P Zhang; D Zontar; Belle Collaboration

doi:10.1103/PhysRevLett.94.231601

Measurement of the time-dependent CP-violating asymmetry in B(0)-->K(0)(S)pi(0)gamma decays

Phys Rev Lett. 2005 Jun 17;94(23):231601. doi: 10.1103/PhysRevLett.94.231601. Epub 2005 Jun 16.

Authors

Y Ushiroda¹, K Sumisawa, M Hazumi, K Abe, K Abe, I Adachi, H Aihara, Y Asano, V Aulchenko, T Aushev, A M Bakich, A Bay, I Bedny, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, M-C Chang, P Chang, Y Chao, A Chen, K-F Chen, W T Chen, B G Cheon, S-K Choi, Y Choi, A Chuvikov, S Cole, J Dalseno, M Danilov, M Dash, J Dragic, S Eidelman, F Fang, S Fratina, N Gabyshev, T Gershon, G Gokhroo, A Gorisek, J Haba, K Hara, N C Hastings, K Hayasaka, H Hayashii, T Higuchi, L Hinz, T Hokuue, Y Hoshi, S Hou, W-S Hou, Y B Hsiung, T Iijima, A Imoto, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, J H Kang, J S Kang, P Kapusta, N Katayama, H Kawai, T Kawasaki, H R Khan, H Kichimi, H J Kim, S M Kim, K Kinoshita, P Krizan, P Krokovny, S Kumar, C C Kuo, A Kusaka, A Kuzmin, Y-J Kwon, G Leder, T Lesiak, J Li, A Limosani, S-W Lin, D Liventsev, F Mandl, T Matsumoto, Y Mikami, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, D Mohapatra, G R Moloney, T Nagamine, E Nakano, M Nakao, S Nishida, O Nitoh, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, C W Park, N Parslow, L S Peak, R Pestotnik, L E Piilonen, H Sagawa, Y Sakai, N Sato, T Schietinger, O Schneider, A J Schwartz, K Senyo, M E Sevior, T Shibata, H Shibuya, J B Singh, A Somov, N Soni, R Stamen, S Stanic, M Staric, T Sumiyoshi, S Suzuki, O Tajima, F Takasaki, K Tamai, N Tamura, M Tanaka, Y Teramoto, X C Tian, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, S Uno, P Urquijo, G Varner, K E Varvell, S Villa, C C Wang, C H Wang, M Watanabe, Y Watanabe, Q L Xie, A Yamaguchi, Y Yamashita, M Yamauchi, Heyoung Yang, J Ying, J Zhang, L M Zhang, Z P Zhang, D Zontar; Belle Collaboration

Affiliation

¹ High Energy Accelerator Research Organization (KEK), Tsukuba.

PMID: 16090457
DOI: 10.1103/PhysRevLett.94.231601

Abstract

We present a new measurement of CP-violation parameters in B(0)-->K(0)(S)pi(0)gamma decay based on a sample of 275 x 10(6) BB pairs collected at the Gamma(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. One of the B mesons is fully reconstructed in the B(0)-->K(0)(S)pi(0)gamma decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain SK(0)(S)(pi(0)gamma) = -0.58(+0.46)(-0.38)(stat) +/- 0.11(syst) and AK(0)(S)(pi(0)gamma) = +0.03 +/- 0.34(stat) +/- 0.11(syst), for the K(0)(S)pi(0) invariant mass covering the full range up to 1.8 GeV/c2. We also measure the CP-violation parameters for the case B(0)-->K(*0)(-->K(0)(S)pi(0))gamma and obtain S(K(*0)gamma) = -0.79(+0.63)(-0.50)(stat) +/- 0.10(syst) for A(K(*0)gamma) fixed at 0.