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Observation of direct CP violation in B-0 ->pi(+)pi(-) decays and model-independent constraints on the quark-mixing angle phi(2)
- Authors
- Ishino, H.; Abe, K.; Abe, K.; Adachi, I.; Aihara, H.; Anipko, D.; Arinstein, K.; Aushev, T.; Bakich, A. M.; Barberio, E.; Barbero, M.; Bedny, I.; Bitenc, U.; Bizjak, I.; Blyth, S.; Bozek, A.; Bracko, M.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chao, Y.; Chen, A.; Chen, K.-F.; Chen, W. T.; Cheon, Byung Gu; Chistov, R.; Choi, Y.; Choi, Y. K.; Cole, S.; Dalseno, J.; Dash, M.; Drutskoy, A.; Eidelman, S.; Fratina, S.; Gershon, T.; Go, A.; Gokhroo, G.; Golob, B.; Gorisek, A.; Ha, H.; Haba, J.; Hara, K.; Hayasaka, K.; Hazumi, M.; Heffernan, D.; Hokuue, T.; Hoshi, Y.; Hou, S.; Hsiung, Y. B.; Iijima, T.; Imoto, A.; Inami, K.; Ishikawa, A.; Iwasaki, Y.; Kang, J. H.; Kapusta, P.; Kataoka, S. U.; Katayama, N.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kibayashi, A.; Kichimi, H.; Kinoshita, K.; Korpar, S.; Krizan, P.; Krokovny, P.; Kulasiri, R.; Kumar, R.; Kuo, C. C.; Kusaka, A.; Kuzmin, A.; Kwon, Y.-J.; Lee, M. J.; Lee, S. E.; Lesiak, T.; Limosani, A.; Lin, S.-W.; MacNaughton, J.; Mandl, F.; Marlow, D.; Matsumoto, T.; Matyja, A.; McOnie, S.; Mitaroff, W.; Miyabayashi, K.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mohapatra, D.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nishida, S.; Nitoh, O.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Olsen, S. L.; Onuki, Y.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, H.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Sahoo, H.; Sakai, Y.; Satoyama, N.; Schietinger, T.; Schneider, O.; Schuemann, J.; Schwanda, C.; Schwartz, A. J.; Seidl, R.; Senyo, K.; Sevior, M. E.; Shibuya, H.; Shwartz, B.; Somov, A.; Soni, N.; Stanic, S.; Staric, M.; Stoeck, H.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S. Y.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Teramoto, Y.; Tian, X. C.; Trabelsi, K.; Tsukamoto, T.; Uehara, S.; Ueno, K.; Unno, Y.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Usov, Y.; Varner, G.; Varvell, K. E.; Villa, S.; Wang, C. H.; Wang, M.-Z.; Watanabe, Y.; Won, E.; Wu, C.-H.; Xie, Q. L.; Yabsley, B. D.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Zhang, L. M.; Zhang, Z. P.; Zhilich, V.; Zupanc, A.
- Issue Date
- May-2007
- Publisher
- American Physical Society
- Citation
- Physical Review Letters, v.98, no.21, pp 1 - 6
- Pages
- 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- Physical Review Letters
- Volume
- 98
- Number
- 21
- Start Page
- 1
- End Page
- 6
- ISSN
- 0031-9007
1079-7114
- Abstract
- We report a new measurement of the time-dependent CP-violating parameters in B-0 ->pi(+)pi(-) decays with 535x10(6) B (B) over bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider operating at the Upsilon(4S) resonance. We find 1464 +/- 65 B-0 ->pi(+)pi(-) events and measure the CP-violating parameters S-pi pi=-0.61 +/- 0.10(stat)+/- 0.04(syst) and A(pi pi)=+0.55 +/- 0.08(stat)+/- 0.05(syst). We observe large direct CP violation with a significance greater than 5 standard deviations for any S-pi pi value. Using isospin relations, we measure the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle phi(2)=(97 +/- 11)degrees for the solution consistent with the standard model and exclude the range 11 degrees <phi(2)< 79 degrees at the 95% confidence level.
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Collections - 서울 자연과학대학 > 서울 물리학과 > 1. Journal Articles
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Related Researcher
- Cheon, Byung Gu
- COLLEGE OF NATURAL SCIENCES (DEPARTMENT OF PHYSICS)