Evidence for CP-violating asymmetries in B0→π+π- decays and constraints on the CKM angle φ2 -: art. no. 012001

被引:58
作者
Abe, K [1 ]
Abe, K [1 ]
Abe, N
Abe, T
Adachi, I
Aihara, H
Akai, K
Akatsu, M
Akemoto, M
Asano, Y
Aushev, T
Bakich, AM
Ban, Y
Banas, E
Bay, A
Bedny, I
Behera, PK
Bizjak, I
Bondar, A
Bozek, A
Bracko, M
Brodzicka, J
Browder, TE
Casey, BCK
Chang, P
Chen, KF
Cheon, BG
Chistov, R
Choi, SK
Choi, Y
Choi, YK
Danilov, M
Dragic, J
Drutskoy, A
Eidelman, S
Eiges, V
Everton, CW
Flanagan, J
Fukunaga, C
Furukawa, K
Gabyshev, N
Garmash, A
Gershon, T
Golob, B
Guo, R
Hagner, C
Hara, K
Hastings, NC
Hasuko, K
Hayashii, H
机构
[1] High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan
[2] Aomori Univ, Aomori, Japan
[3] Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[4] Chuo Univ, Tokyo 112, Japan
[5] Univ Cincinnati, Cincinnati, OH 45221 USA
[6] Goethe Univ Frankfurt, D-6000 Frankfurt, Germany
[7] Univ Hawaii, Honolulu, HI 96822 USA
[8] Hiroshima Inst Technol, Hiroshima, Japan
[9] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China
[10] Inst High Energy Phys, Vienna, Austria
[11] Inst Theoret & Expt Phys, Moscow 117259, Russia
[12] Jozef Stefan Inst, Ljubljana, Slovenia
[13] Kanagawa Univ, Yokohama, Kanagawa, Japan
[14] Korea Univ, Seoul 136701, South Korea
[15] Kyoto Univ, Kyoto, Japan
[16] Kyungpook Natl Univ, Taegu 702701, South Korea
[17] Univ Lausanne, Inst Phys Hautes Energies, Lausanne, Switzerland
[18] Univ Ljubljana, Ljubljana, Slovenia
[19] Univ Maribor, SLO-2000 Maribor, Slovenia
[20] Univ Melbourne, Parkville, Vic 3052, Australia
[21] Nagoya Univ, Nagoya, Aichi, Japan
[22] Nara Womens Univ, Nara 630, Japan
[23] Natl Kaohsiung Normal Univ, Kaohsiung, Taiwan
[24] Natl Lien Ho Inst Technol, Miaoli, Taiwan
[25] Natl Taiwan Univ, Taipei 10764, Taiwan
[26] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[27] Nihon Dent Coll, Niigata, Japan
[28] Niigata Univ, Niigata, Japan
[29] Osaka City Univ, Osaka 558, Japan
[30] Osaka Univ, Osaka, Japan
[31] Panjab Univ, Chandigarh 160014, India
[32] Peking Univ, Beijing 100871, Peoples R China
[33] Princeton Univ, Princeton, NJ 08545 USA
[34] RIKEN BNL Res Ctr, Upton, NY 11973 USA
[35] Saga Univ, Saga 840, Japan
[36] Univ Sci & Technol China, Hefei 230026, Peoples R China
[37] Seoul Natl Univ, Seoul, South Korea
[38] Sungkyunkwan Univ, Suwon, South Korea
[39] Univ Sydney, Sydney, NSW 2006, Australia
[40] Toho Univ, Funabashi, Chiba 274, Japan
[41] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan
[42] Tohoku Univ, Sendai, Miyagi 980, Japan
[43] Univ Tokyo, Tokyo, Japan
[44] Tokyo Inst Technol, Tokyo 152, Japan
[45] Tokyo Metropolitan Univ, Tokyo 158, Japan
[46] Tokyo Univ Agr & Technol, Tokyo, Japan
[47] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan
[48] Utkal Univ, Bhubaneswar 751004, Orissa, India
[49] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[50] Yokkaichi Univ, Yokaichi, Japan
关键词
D O I
10.1103/PhysRevD.68.012001
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an improved measurement of CP-violating asymmetries in B-0-->pi(+)pi(-) decays based on a 78 fb(-1) data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We reconstruct one neutral B meson as a B-0-->pi(+)pi(-) CP eigenstate and identify the flavor of the accompanying B meson from inclusive properties of its decay products. We apply an unbinned maximum likelihood fit to the distribution of the time intervals between the two B meson decay points. The fit yields the CP-violating asymmetry amplitudes A(pipi) = +0.77 +/-0.27(stat) +/-0.08(syst) and S-pipi = -1.23+/-0.41(stat) (+0.08)(-0.07)(syst), where the statistical uncertainties are determined from the Monte Carlo pseudoexperiments. We obtain confidence intervals for CP-violating asymmetry parameters A(pipi) and S-pipi based on a frequentist approach. We rule out the CP-conserving case, A(pipi) = S-pipi = 0, at the 99.93% confidence level. We discuss how these results constrain the value of the Cabibbo-Kobayashi-Maskawa (CKM) angle phi(2).
引用
收藏
页数:15
相关论文
共 35 条
[1]   The Belle detector [J].
Abashian, A ;
Abe, K ;
Abe, R ;
Abe, K ;
Adachi, I ;
Ahn, BS ;
Ahn, HS ;
Aihara, H ;
Akatsu, M ;
Akhmetshin, R ;
Alexander, JP ;
Alimonti, G ;
An, Q ;
Aoki, K ;
Asai, M ;
Asano, Y ;
Aso, T ;
Aulchenko, V ;
Bakich, AM ;
Banas, E ;
Behari, S ;
Behera, PK ;
Beiline, D ;
Bondar, A ;
Bozek, A ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chang, YH ;
Chao, Y ;
Chen, HS ;
Chen, HF ;
Chen, YQ ;
Cheon, BG ;
Chidzik, S ;
Choi, S ;
Choi, Y ;
Dneprovsky, L ;
Doi, Y ;
Dong, LY ;
Dragic, J ;
Drutskoy, A ;
Eidelman, S ;
Enomoto, R ;
Everton, CW ;
Fang, F ;
Fujii, H ;
Fujimoto, K ;
Fujita, Y ;
Fukunaga, C .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 479 (01) :117-232
[2]   Improved measurement of mixing-induced CP violation in the neutral B meson system -: art. no. 071102 [J].
Abe, K ;
Abe, K ;
Abe, T ;
Adachi, I ;
Aihara, H ;
Akatsu, M ;
Asano, Y ;
Aso, T ;
Aulchenko, V ;
Aushev, T ;
Bakich, AM ;
Banas, E ;
Bay, A ;
Behera, PK ;
Bizjak, I ;
Bondar, A ;
Bozek, A ;
Bracko, M ;
Brodzicka, J ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chao, Y ;
Chen, KF ;
Cheon, BG ;
Chistov, R ;
Choi, Y ;
Choi, YK ;
Danilov, M ;
Dong, LY ;
Drutskoy, A ;
Eidelman, S ;
Eiges, V ;
Enari, Y ;
Everton, CW ;
Fang, F ;
Fujii, H ;
Fukunaga, C ;
Gabyshev, N ;
Garmash, A ;
Gershon, T ;
Golob, B ;
Gotow, K ;
Guo, R ;
Haba, J ;
Hanagaki, K ;
Handa, F ;
Hara, K ;
Hara, T ;
Harada, Y .
PHYSICAL REVIEW D, 2002, 66 (07)
[3]   Observation of mixing-induced CP violation in the neutral B meson system -: art. no. 032007 [J].
Abe, K ;
Abe, K ;
Abe, R ;
Abe, T ;
Adachi, I ;
Ahn, BS ;
Aihara, H ;
Akatsu, M ;
Asano, Y ;
Aso, T ;
Aushev, T ;
Bakich, AM ;
Ban, Y ;
Banas, E ;
Behari, S ;
Behera, PK ;
Bondar, A ;
Bozek, A ;
Bracko, M ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chao, Y ;
Cheon, BG ;
Chistov, R ;
Choi, SK ;
Choi, Y ;
Dong, LY ;
Dragic, J ;
Drutskoy, A ;
Eidelman, S ;
Eiges, V ;
Enari, Y ;
Everton, CW ;
Fang, F ;
Fukunaga, C ;
Fukushima, M ;
Gabyshev, N ;
Garmash, A ;
Gershon, T ;
Golob, B ;
Gordon, A ;
Guler, H ;
Guo, R ;
Haba, J ;
Hamasaki, H ;
Hanagaki, K ;
Handa, F ;
Hara, K ;
Hara, T .
PHYSICAL REVIEW D, 2002, 66 (03)
[4]   Study of CP-violating asymmetries in B0→π+π- decays -: art. no. 071801 [J].
Abe, K ;
Abe, K ;
Abe, T ;
Adachi, I ;
Ahn, BS ;
Aihara, H ;
Akatsu, M ;
Asano, Y ;
Aso, T ;
Aulchenko, V ;
Aushev, T ;
Bakich, AM ;
Ban, Y ;
Banas, E ;
Bedny, I ;
Behari, S ;
Behera, PK ;
Bondar, A ;
Bozek, A ;
Bracko, M ;
Brodzicka, J ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chao, Y ;
Cheon, BG ;
Chistov, R ;
Choi, SK ;
Choi, Y ;
Danilov, M ;
Dong, LY ;
Dragic, J ;
Drutskoy, A ;
Eidelman, S ;
Eiges, V ;
Enari, Y ;
Everton, CW ;
Fang, F ;
Fujii, H ;
Fukunaga, C ;
Fukushima, M ;
Gabyshev, N ;
Garmash, A ;
Gershon, T ;
Golob, B ;
Gordon, A ;
Guo, R ;
Haba, J ;
Hamasaki, H ;
Hanagaki, K .
PHYSICAL REVIEW LETTERS, 2002, 89 (07)
[5]   Observation of large CP violation in the neutral B meson system -: art. no. 091802 [J].
Abe, K ;
Abe, K ;
Abe, R ;
Adachi, I ;
Ahn, BS ;
Aihara, H ;
Akatsu, M ;
Alimonti, G ;
Asai, K ;
Asai, M ;
Asano, Y ;
Aso, T ;
Aulchenko, V ;
Aushev, T ;
Bakich, AM ;
Banas, E ;
Behari, S ;
Behara, PK ;
Beiline, D ;
Bondar, A ;
Bozek, A ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chao, Y ;
Chen, KF ;
Cheon, BG ;
Chistov, R ;
Choi, SK ;
Choi, Y ;
Dong, LY ;
Dragic, J ;
Drutskoy, A ;
Eidelman, S ;
Eiges, V ;
Enari, Y ;
Enomoto, R ;
Everton, CW ;
Fang, F ;
Fujii, H ;
Fukunaga, C ;
Fukushima, M ;
Gabyshev, N ;
Garmash, A ;
Gershon, TJ ;
Gordon, A ;
Gotow, K ;
Guler, H ;
Guo, R ;
Haba, J .
PHYSICAL REVIEW LETTERS, 2001, 87 (09)
[6]   A measurement of the branching fraction for the inclusive B→Xsγ decays with the Belle detector [J].
Abe, K ;
Abe, K ;
Adachi, I ;
Ahn, BS ;
Aihara, H ;
Akatsu, M ;
Alimonti, G ;
Aoki, K ;
Asai, K ;
Asano, Y ;
Aso, T ;
Aulchenko, V ;
Aushev, T ;
Bakich, AM ;
Banas, E ;
Bartel, W ;
Behari, S ;
Behera, PK ;
Beiline, D ;
Bondar, A ;
Bozek, A ;
Browder, TE ;
Casey, BCK ;
Chang, P ;
Chao, Y ;
Cheon, BG ;
Choi, SK ;
Choi, Y ;
Doi, Y ;
Dragic, J ;
Drutskoy, A ;
Eidelman, S ;
Enari, Y ;
Enomoto, R ;
Fang, F ;
Fujii, H ;
Fukunaga, C ;
Fukushima, M ;
Garmash, A ;
Gordon, A ;
Gotow, K ;
Guler, H ;
Guo, R ;
Haba, J ;
Hamasaki, H ;
Hanagaki, K ;
Handa, F ;
Hara, K ;
Hara, T ;
Haruyama, T .
PHYSICS LETTERS B, 2001, 511 (2-4) :151-158
[7]   SEARCH FOR HADRONIC B-]U DECAYS [J].
ALBRECHT, H ;
GLASER, R ;
HARDER, G ;
KRUGER, A ;
NILSSON, AW ;
NIPPE, A ;
OEST, T ;
REIDENBACH, M ;
SCHAFER, M ;
SCHMIDTPARZEFALL, W ;
SCHRODER, H ;
SCHULZ, HD ;
SEFKOW, F ;
WURTH, R ;
APPUHN, RD ;
DRESCHER, A ;
HAST, C ;
HERRERA, G ;
KOLANOSKI, H ;
LANGE, A ;
LINDNER, A ;
MANKEL, R ;
SCHECK, H ;
SCHWEDA, G ;
SPAAN, B ;
WALTHER, A ;
WEGENER, D ;
PAULINI, M ;
REIM, K ;
VOLLAND, U ;
WEGENER, H ;
FUNK, W ;
STIEWE, J ;
WERNER, S ;
BALL, S ;
GABRIEL, JC ;
GEYER, C ;
HOLSCHER, A ;
HOFMANN, W ;
HOLZER, B ;
KHAN, S ;
SPENGLER, J ;
CHARLESWORTH, CEK ;
EDWARDS, KW ;
FRISKEN, WR ;
KAPITZA, H ;
KRIEGER, P ;
KUTSCHKE, R ;
MACFARLANE, DB ;
MCLEAN, KW .
PHYSICS LETTERS B, 1990, 241 (02) :278-282
[8]   Measurements of branching fractions and CP-violating asymmetries in B0→π+π-, K+ π-, K+K- decays -: art. no. 281802 [J].
Aubert, B ;
Boutigny, D ;
Gaillard, JM ;
Hicheur, A ;
Karyotakis, Y ;
Lees, JP ;
Robbe, P ;
Tisserand, V ;
Zghiche, A ;
Palano, A ;
Pompili, A ;
Chen, JC ;
Qi, ND ;
Rong, G ;
Wang, P ;
Zhu, YS ;
Eigen, G ;
Ofte, I ;
Stugu, B ;
Abrams, GS ;
Borgland, AW ;
Breon, AB ;
Brown, DN ;
Button-Shafer, J ;
Cahn, RN ;
Charles, E ;
Gill, MS ;
Gritsan, AV ;
Groysman, Y ;
Jacobsen, RG ;
Kadel, RW ;
Kadyk, J ;
Kerth, LT ;
Kolomensky, YG ;
Kral, JF ;
LeClerc, C ;
Levi, ME ;
Lynch, G ;
Mir, LM ;
Oddone, PJ ;
Orimoto, TJ ;
Pripstein, M ;
Roe, NA ;
Romosan, A ;
Ronan, MT ;
Shelkov, VG ;
Telnov, AV ;
Wenzel, WA ;
Harrison, TJ ;
Hawkes, CM .
PHYSICAL REVIEW LETTERS, 2002, 89 (28) :281802/1-281802/7
[9]   Measurement of the CP asymmetry amplitude sin2β with B0 mesons -: art. no. 201802 [J].
Aubert, B ;
Boutigny, D ;
Gaillard, JM ;
Hicheur, A ;
Karyotakis, Y ;
Lees, JP ;
Robbe, P ;
Tisserand, V ;
Zghiche, A ;
Palano, A ;
Pompili, A ;
Chen, JC ;
Qi, ND ;
Rong, G ;
Wang, P ;
Zhu, YS ;
Eigen, G ;
Ofte, I ;
Stugu, B ;
Abrams, GS ;
Borgland, AW ;
Breon, AB ;
Brown, DN ;
Button-Shafer, J ;
Cahn, RN ;
Charles, E ;
Gill, MS ;
Gritsan, AV ;
Groysman, Y ;
Jacobsen, RG ;
Kadel, RW ;
Kadyk, J ;
Kerth, LT ;
Kolomensky, YG ;
Kral, JF ;
LeClerc, C ;
Levi, ME ;
Lynch, G ;
Mir, LM ;
Oddone, PJ ;
Orimoto, TJ ;
Pripstein, M ;
Roe, NA ;
Romosan, A ;
Ronan, MT ;
Shelkov, VG ;
Telnov, AV ;
Wenzel, WA ;
Harrison, TJ ;
Hawkes, CM .
PHYSICAL REVIEW LETTERS, 2002, 89 (20) :2018021-2018027
[10]   Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S) -: art. no. 032003 [J].
Aubert, B ;
Boutigny, D ;
Gaillard, JM ;
Hicheur, A ;
Karyotakis, Y ;
Lees, JP ;
Robbe, P ;
Tisserand, V ;
Palano, A ;
Pompili, A ;
Chen, GP ;
Chen, JC ;
Qi, ND ;
Rong, G ;
Wang, P ;
Zhu, YS ;
Eigen, G ;
Stugu, B ;
Abrams, GS ;
Borgland, AW ;
Breon, AB ;
Brown, DN ;
Button-Shafer, J ;
Cahn, RN ;
Clark, AR ;
Gill, MS ;
Gritsan, AV ;
Groysman, Y ;
Jacobsen, RG ;
Kadel, RW ;
Kadyk, J ;
Kerth, LT ;
Kolomensky, YG ;
Kral, JF ;
LeClerc, C ;
Levi, ME ;
Lynch, G ;
Oddone, PJ ;
Pripstein, M ;
Roe, NA ;
Romosan, A ;
Ronan, MT ;
Shelkov, VG ;
Telnov, AV ;
Wenzel, WA ;
Harrison, TJ ;
Hawkes, CM ;
Knowles, DJ ;
O'Neale, SW ;
Penny, RC .
PHYSICAL REVIEW D, 2002, 66 (03)