Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2

K. Abe, I. Adachi, H. Aihara, K. Arinstein, Y. Asano, T. Aushev, A. M. Bakich, Y. Ban, E. Barberio, M. Barbero, A. Bay, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, P. Chang & 170 others Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Dash, L. Y. Dong, A. Drutskoy, S. Eidelman, Y. Enari, F. Fang, S. Fratina, N. Gabyshev, A. Garmash, T. Gershon, G. Gokhroo, B. Golob, A. Gorišek, J. Haba, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, Hirokazu Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kakuno, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, A. Kibayashi, H. Kichimi, S. M. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, S. Kumar, C. C. Kuo, A. Kusaka, A. Kuzmin, Y. J. Kwon, G. Leder, S. E. Lee, T. Lesiak, J. Li, S. W. Lin, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, A. Matyja, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, D. Mohapatra, A. Murakami, T. Nagamine, Y. Nagasaka, I. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, H. Park, N. Parslow, L. S. Peak, R. Pestotnik, L. E. Piilonen, F. J. Ronga, M. Rozanska, H. Sagawa, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, P. Schönmeier, J. Schumann, A. J. Schwartz, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, A. Somov, N. Soni, R. Stamen, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. 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, K. Ueno, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yang, J. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar, D. Zürcher

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present a new measurement of the time-dependent CP-violating parameters in B0→π+π- decays with 275×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating at the Υ(4S) resonance. We find 666±43 B0→π+π- events and measure the CP-violating parameters: Sππ=-0.67±0.16(stat)±0. 06(syst) and Aππ=+0.56±0.12(stat)±0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any Sππ value. Using isospin relations, we obtain 95.4% confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle 2 of 0°

Original languageEnglish
Article number101801
JournalPhysical Review Letters
Volume95
Issue number10
DOIs
Publication statusPublished - Sep 2 2005
Externally publishedYes

Fingerprint

CP violation
decay
confidence
standard deviation
quarks
intervals
detectors
matrices
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Abe, K., Adachi, I., Aihara, H., Arinstein, K., Asano, Y., Aushev, T., ... Zürcher, D. (2005). Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2. Physical Review Letters, 95(10), [101801]. https://doi.org/10.1103/PhysRevLett.95.101801

Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2. / Abe, K.; Adachi, I.; Aihara, H.; Arinstein, K.; Asano, Y.; Aushev, T.; Bakich, A. M.; Ban, Y.; Barberio, E.; Barbero, M.; Bay, A.; Bitenc, U.; Bizjak, I.; Blyth, S.; Bondar, A.; Bozek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, P.; Chao, Y.; Chen, A.; Chen, K. F.; Chen, W. T.; Cheon, B. G.; Chistov, R.; Choi, S. K.; Choi, Y.; Choi, Y. K.; Chuvikov, A.; Cole, S.; Dalseno, J.; Dash, M.; Dong, L. Y.; Drutskoy, A.; Eidelman, S.; Enari, Y.; Fang, F.; Fratina, S.; Gabyshev, N.; Garmash, A.; Gershon, T.; Gokhroo, G.; Golob, B.; Gorišek, A.; Haba, J.; Hara, K.; Hara, T.; Hastings, N. C.; Hayashii, H.; Hazumi, M.; Hinz, L.; Hokuue, T.; Hoshi, Y.; Hou, S.; Hou, W. S.; Hsiung, Y. B.; Iijima, T.; Imoto, A.; Inami, K.; Ishikawa, A.; Ishino, Hirokazu; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kakuno, H.; Kang, J. H.; Kang, J. S.; Kapusta, P.; Katayama, N.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kibayashi, A.; Kichimi, H.; Kim, S. M.; Kinoshita, K.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, S.; Kuo, C. C.; Kusaka, A.; Kuzmin, A.; Kwon, Y. J.; Leder, G.; Lee, S. E.; Lesiak, T.; Li, J.; Lin, S. W.; MacNaughton, J.; Majumder, G.; Mandl, F.; Marlow, D.; Matyja, A.; Mikami, Y.; Mitaroff, W.; Miyabayashi, K.; Miyake, H.; Miyata, H.; Mizuk, R.; Mohapatra, D.; Murakami, A.; Nagamine, T.; Nagasaka, Y.; Nakamura, I.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Noguchi, S.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okabe, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Ostrowicz, W.; Ozaki, H.; Pakhlov, P.; Palka, H.; Park, H.; Parslow, N.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Ronga, F. J.; Rozanska, M.; Sagawa, H.; Sakai, Y.; Sato, N.; Schietinger, T.; Schneider, O.; Schönmeier, P.; Schumann, J.; Schwartz, A. J.; Senyo, K.; Sevior, M. E.; Shibuya, H.; Shwartz, B.; Sidorov, V.; Singh, J. B.; Somov, A.; Soni, N.; Stamen, R.; Stanič, S.; Starič, M.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Suzuki, S. Y.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Teramoto, Y.; Tian, X. C.; Trabelsi, K.; Tsuboyama, T.; Tsukamoto, T.; Uehara, S.; Uglov, T.; Ueno, K.; Unno, Y.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Varner, G.; Varvell, K. E.; Villa, S.; Wang, C. C.; Wang, C. H.; Wang, M. Z.; Watanabe, Y.; Xie, Q. L.; Yabsley, B. D.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Yang, H.; Zhang, J.; Zhang, L. M.; Zhang, Z. P.; Zhilich, V.; Žontar, D.; Zürcher, D.

In: Physical Review Letters, Vol. 95, No. 10, 101801, 02.09.2005.

Research output: Contribution to journalArticle

Abe, K, Adachi, I, Aihara, H, Arinstein, K, Asano, Y, Aushev, T, Bakich, AM, Ban, Y, Barberio, E, Barbero, M, Bay, A, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, P, Chao, Y, Chen, A, Chen, KF, Chen, WT, Cheon, BG, Chistov, R, Choi, SK, Choi, Y, Choi, YK, Chuvikov, A, Cole, S, Dalseno, J, Dash, M, Dong, LY, Drutskoy, A, Eidelman, S, Enari, Y, Fang, F, Fratina, S, Gabyshev, N, Garmash, A, Gershon, T, Gokhroo, G, Golob, B, Gorišek, A, Haba, J, Hara, K, Hara, T, Hastings, NC, Hayashii, H, Hazumi, M, Hinz, L, Hokuue, T, Hoshi, Y, Hou, S, Hou, WS, Hsiung, YB, Iijima, T, Imoto, A, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kakuno, H, Kang, JH, Kang, JS, Kapusta, P, Katayama, N, Kawai, H, Kawasaki, T, Khan, HR, Kibayashi, A, Kichimi, H, Kim, SM, Kinoshita, K, Korpar, S, Križan, P, Krokovny, P, Kumar, S, Kuo, CC, Kusaka, A, Kuzmin, A, Kwon, YJ, Leder, G, Lee, SE, Lesiak, T, Li, J, Lin, SW, MacNaughton, J, Majumder, G, Mandl, F, Marlow, D, Matyja, A, Mikami, Y, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Mizuk, R, Mohapatra, D, Murakami, A, Nagamine, T, Nagasaka, Y, Nakamura, I, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ogawa, S, Ohshima, T, Okabe, T, Okuno, S, Olsen, SL, Onuki, Y, Ostrowicz, W, Ozaki, H, Pakhlov, P, Palka, H, Park, H, Parslow, N, Peak, LS, Pestotnik, R, Piilonen, LE, Ronga, FJ, Rozanska, M, Sagawa, H, Sakai, Y, Sato, N, Schietinger, T, Schneider, O, Schönmeier, P, Schumann, J, Schwartz, AJ, Senyo, K, Sevior, ME, Shibuya, H, Shwartz, B, Sidorov, V, Singh, JB, Somov, A, Soni, N, Stamen, R, Stanič, S, Starič, M, Sumisawa, K, Sumiyoshi, T, Suzuki, S, Suzuki, SY, Tajima, O, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Teramoto, Y, Tian, XC, Trabelsi, K, Tsuboyama, T, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Unno, Y, Uno, S, Urquijo, P, Ushiroda, Y, Varner, G, Varvell, KE, Villa, S, Wang, CC, Wang, CH, Wang, MZ, Watanabe, Y, Xie, QL, Yabsley, BD, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Yang, H, Zhang, J, Zhang, LM, Zhang, ZP, Zhilich, V, Žontar, D & Zürcher, D 2005, 'Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2', Physical Review Letters, vol. 95, no. 10, 101801. https://doi.org/10.1103/PhysRevLett.95.101801
Abe, K. ; Adachi, I. ; Aihara, H. ; Arinstein, K. ; Asano, Y. ; Aushev, T. ; Bakich, A. M. ; Ban, Y. ; Barberio, E. ; Barbero, M. ; Bay, A. ; Bitenc, U. ; Bizjak, I. ; Blyth, S. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T. E. ; Chang, P. ; Chao, Y. ; Chen, A. ; Chen, K. F. ; Chen, W. T. ; Cheon, B. G. ; Chistov, R. ; Choi, S. K. ; Choi, Y. ; Choi, Y. K. ; Chuvikov, A. ; Cole, S. ; Dalseno, J. ; Dash, M. ; Dong, L. Y. ; Drutskoy, A. ; Eidelman, S. ; Enari, Y. ; Fang, F. ; Fratina, S. ; Gabyshev, N. ; Garmash, A. ; Gershon, T. ; Gokhroo, G. ; Golob, B. ; Gorišek, A. ; Haba, J. ; Hara, K. ; Hara, T. ; Hastings, N. C. ; Hayashii, H. ; Hazumi, M. ; Hinz, L. ; Hokuue, T. ; Hoshi, Y. ; Hou, S. ; Hou, W. S. ; Hsiung, Y. B. ; Iijima, T. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Ishino, Hirokazu ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kakuno, H. ; Kang, J. H. ; Kang, J. S. ; Kapusta, P. ; Katayama, N. ; Kawai, H. ; Kawasaki, T. ; Khan, H. R. ; Kibayashi, A. ; Kichimi, H. ; Kim, S. M. ; Kinoshita, K. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kumar, S. ; Kuo, C. C. ; Kusaka, A. ; Kuzmin, A. ; Kwon, Y. J. ; Leder, G. ; Lee, S. E. ; Lesiak, T. ; Li, J. ; Lin, S. W. ; MacNaughton, J. ; Majumder, G. ; Mandl, F. ; Marlow, D. ; Matyja, A. ; Mikami, Y. ; Mitaroff, W. ; Miyabayashi, K. ; Miyake, H. ; Miyata, H. ; Mizuk, R. ; Mohapatra, D. ; Murakami, A. ; Nagamine, T. ; Nagasaka, Y. ; Nakamura, I. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Noguchi, S. ; Nozaki, T. ; Ogawa, S. ; Ohshima, T. ; Okabe, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Ostrowicz, W. ; Ozaki, H. ; Pakhlov, P. ; Palka, H. ; Park, H. ; Parslow, N. ; Peak, L. S. ; Pestotnik, R. ; Piilonen, L. E. ; Ronga, F. J. ; Rozanska, M. ; Sagawa, H. ; Sakai, Y. ; Sato, N. ; Schietinger, T. ; Schneider, O. ; Schönmeier, P. ; Schumann, J. ; Schwartz, A. J. ; Senyo, K. ; Sevior, M. E. ; Shibuya, H. ; Shwartz, B. ; Sidorov, V. ; Singh, J. B. ; Somov, A. ; Soni, N. ; Stamen, R. ; Stanič, S. ; Starič, M. ; Sumisawa, K. ; Sumiyoshi, T. ; Suzuki, S. ; Suzuki, S. Y. ; Tajima, O. ; Takasaki, F. ; Tamai, K. ; Tamura, N. ; Tanaka, M. ; Teramoto, Y. ; Tian, X. C. ; Trabelsi, K. ; Tsuboyama, T. ; Tsukamoto, T. ; Uehara, S. ; Uglov, T. ; Ueno, K. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Ushiroda, Y. ; Varner, G. ; Varvell, K. E. ; Villa, S. ; Wang, C. C. ; Wang, C. H. ; Wang, M. Z. ; Watanabe, Y. ; Xie, Q. L. ; Yabsley, B. D. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Yang, H. ; Zhang, J. ; Zhang, L. M. ; Zhang, Z. P. ; Zhilich, V. ; Žontar, D. ; Zürcher, D. / Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2. In: Physical Review Letters. 2005 ; Vol. 95, No. 10.
@article{747bce35293b4b43ac4a1e860fe44fde,
title = "Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2",
abstract = "We present a new measurement of the time-dependent CP-violating parameters in B0→π+π- decays with 275×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating at the Υ(4S) resonance. We find 666±43 B0→π+π- events and measure the CP-violating parameters: Sππ=-0.67±0.16(stat)±0. 06(syst) and Aππ=+0.56±0.12(stat)±0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any Sππ value. Using isospin relations, we obtain 95.4{\%} confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle 2 of 0°",
author = "K. Abe and I. Adachi and H. Aihara and K. Arinstein and Y. Asano and T. Aushev and Bakich, {A. M.} and Y. Ban and E. Barberio and M. Barbero and A. Bay and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and A. Bozek and M. Bračko and J. Brodzicka and Browder, {T. E.} and P. Chang and Y. Chao and A. Chen and Chen, {K. F.} and Chen, {W. T.} and Cheon, {B. G.} and R. Chistov and Choi, {S. K.} and Y. Choi and Choi, {Y. K.} and A. Chuvikov and S. Cole and J. Dalseno and M. Dash and Dong, {L. Y.} and A. Drutskoy and S. Eidelman and Y. Enari and F. Fang and S. Fratina and N. Gabyshev and A. Garmash and T. Gershon and G. Gokhroo and B. Golob and A. Gorišek and J. Haba and K. Hara and T. Hara and Hastings, {N. C.} and H. Hayashii and M. Hazumi and L. Hinz and T. Hokuue and Y. Hoshi and S. Hou and Hou, {W. S.} and Hsiung, {Y. B.} and T. Iijima and A. Imoto and K. Inami and A. Ishikawa and Hirokazu Ishino and R. Itoh and M. Iwasaki and Y. Iwasaki and H. Kakuno and Kang, {J. H.} and Kang, {J. S.} and P. Kapusta and N. Katayama and H. Kawai and T. Kawasaki and Khan, {H. R.} and A. Kibayashi and H. Kichimi and Kim, {S. M.} and K. Kinoshita and S. Korpar and P. Križan and P. Krokovny and S. Kumar and Kuo, {C. C.} and A. Kusaka and A. Kuzmin and Kwon, {Y. J.} and G. Leder and Lee, {S. E.} and T. Lesiak and J. Li and Lin, {S. W.} and J. MacNaughton and G. Majumder and F. Mandl and D. Marlow and A. Matyja and Y. Mikami and W. Mitaroff and K. Miyabayashi and H. Miyake and H. Miyata and R. Mizuk and D. Mohapatra and A. Murakami and T. Nagamine and Y. Nagasaka and I. Nakamura and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Noguchi and T. Nozaki and S. Ogawa and T. Ohshima and T. Okabe and S. Okuno and Olsen, {S. L.} and Y. Onuki and W. Ostrowicz and H. Ozaki and P. Pakhlov and H. Palka and H. Park and N. Parslow and Peak, {L. S.} and R. Pestotnik and Piilonen, {L. E.} and Ronga, {F. J.} and M. Rozanska and H. Sagawa and Y. Sakai and N. Sato and T. Schietinger and O. Schneider and P. Sch{\"o}nmeier and J. Schumann and Schwartz, {A. J.} and K. Senyo and Sevior, {M. E.} and H. Shibuya and B. Shwartz and V. Sidorov and Singh, {J. B.} and A. Somov and N. Soni and R. Stamen and S. Stanič and M. Starič and K. Sumisawa and T. Sumiyoshi and S. Suzuki and Suzuki, {S. Y.} and O. Tajima and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and Y. Teramoto and Tian, {X. C.} and K. Trabelsi and T. Tsuboyama and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and Y. Unno and S. Uno and P. Urquijo and Y. Ushiroda and G. Varner and Varvell, {K. E.} and S. Villa and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and Y. Watanabe and Xie, {Q. L.} and Yabsley, {B. D.} and A. Yamaguchi and Y. Yamashita and M. Yamauchi and H. Yang and J. Zhang and Zhang, {L. M.} and Zhang, {Z. P.} and V. Zhilich and D. Žontar and D. Z{\"u}rcher",
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language = "English",
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TY - JOUR

T1 - Improved evidence for direct CP violation in B0→π+π- decays and model-independent constraints on 2

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Arinstein, K.

AU - Asano, Y.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Ban, Y.

AU - Barberio, E.

AU - Barbero, M.

AU - Bay, A.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, P.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Chen, W. T.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choi, Y. K.

AU - Chuvikov, A.

AU - Cole, S.

AU - Dalseno, J.

AU - Dash, M.

AU - Dong, L. Y.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Enari, Y.

AU - Fang, F.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T.

AU - Gokhroo, G.

AU - Golob, B.

AU - Gorišek, A.

AU - Haba, J.

AU - Hara, K.

AU - Hara, T.

AU - Hastings, N. C.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Hinz, L.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Iijima, T.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, Hirokazu

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kakuno, H.

AU - Kang, J. H.

AU - Kang, J. S.

AU - Kapusta, P.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Khan, H. R.

AU - Kibayashi, A.

AU - Kichimi, H.

AU - Kim, S. M.

AU - Kinoshita, K.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, S.

AU - Kuo, C. C.

AU - Kusaka, A.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Leder, G.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Li, J.

AU - Lin, S. W.

AU - MacNaughton, J.

AU - Majumder, G.

AU - Mandl, F.

AU - Marlow, D.

AU - Matyja, A.

AU - Mikami, Y.

AU - Mitaroff, W.

AU - Miyabayashi, K.

AU - Miyake, H.

AU - Miyata, H.

AU - Mizuk, R.

AU - Mohapatra, D.

AU - Murakami, A.

AU - Nagamine, T.

AU - Nagasaka, Y.

AU - Nakamura, I.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okabe, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Ostrowicz, W.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Palka, H.

AU - Park, H.

AU - Parslow, N.

AU - Peak, L. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Ronga, F. J.

AU - Rozanska, M.

AU - Sagawa, H.

AU - Sakai, Y.

AU - Sato, N.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schönmeier, P.

AU - Schumann, J.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Sidorov, V.

AU - Singh, J. B.

AU - Somov, A.

AU - Soni, N.

AU - Stamen, R.

AU - Stanič, S.

AU - Starič, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Suzuki, S. Y.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Ushiroda, Y.

AU - Varner, G.

AU - Varvell, K. E.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Watanabe, Y.

AU - Xie, Q. L.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yang, H.

AU - Zhang, J.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Žontar, D.

AU - Zürcher, D.

PY - 2005/9/2

Y1 - 2005/9/2

N2 - We present a new measurement of the time-dependent CP-violating parameters in B0→π+π- decays with 275×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating at the Υ(4S) resonance. We find 666±43 B0→π+π- events and measure the CP-violating parameters: Sππ=-0.67±0.16(stat)±0. 06(syst) and Aππ=+0.56±0.12(stat)±0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any Sππ value. Using isospin relations, we obtain 95.4% confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle 2 of 0°

AB - We present a new measurement of the time-dependent CP-violating parameters in B0→π+π- decays with 275×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating at the Υ(4S) resonance. We find 666±43 B0→π+π- events and measure the CP-violating parameters: Sππ=-0.67±0.16(stat)±0. 06(syst) and Aππ=+0.56±0.12(stat)±0.06(syst). We find evidence for large direct CP violation with a significance greater than 4 standard deviations for any Sππ value. Using isospin relations, we obtain 95.4% confidence intervals for the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle 2 of 0°

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U2 - 10.1103/PhysRevLett.95.101801

DO - 10.1103/PhysRevLett.95.101801

M3 - Article

VL - 95

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 10

M1 - 101801

ER -