Study of B0 → ρ0ρ0 decays, implications for the CKM angle φ2 and search for other B0 decay modes with a four-pion final state

被引:10
作者
Vanhoefer, P. [33 ]
Dalseno, J. [33 ,55 ]
Kiesling, C. [33 ]
Adachi, I. [13 ]
Aihara, H. [59 ]
Asner, D. M. [46 ]
Aulchenko, V. [3 ]
Aushev, T. [21 ]
Bakich, A. M. [53 ]
Bala, A. [47 ]
Bhardwaj, V. [38 ]
Bhuyan, B. [15 ]
Bonvicini, G. [64 ]
Bozek, A. [42 ]
Bracko, M. [22 ,32 ]
Browder, T. E. [12 ]
Chang, M. -C. [9 ]
Chang, P. [41 ]
Chekelian, V. [33 ]
Chen, A. [39 ]
Chen, P. [41 ]
Cheon, B. G. [11 ]
Chilikin, K. [21 ]
Chistov, R. [21 ]
Cho, K. [26 ]
Chobanova, V. [33 ]
Choi, Y. [52 ]
Cinabro, D. [64 ]
Dolezal, Z. [4 ,5 ]
Drasal, Z. [4 ,5 ]
Eidelman, S. [3 ]
Farhat, H. [64 ]
Fast, J. E. [46 ]
Ferber, T. [8 ]
Gaur, V. [54 ]
Gabyshev, N. [3 ]
Ganguly, S. [64 ]
Garmash, A. [3 ]
Gillard, R. [64 ]
Goh, Y. M. [11 ]
Golob, B. [22 ,30 ]
Hara, T. [13 ]
Hayasaka, K. [37 ]
Hayashii, H. [38 ]
Higuchi, T. [25 ]
Horii, Y. [37 ]
Hoshi, Y. [57 ]
Hou, W. -S. [41 ]
Hyun, H. J. [28 ]
Iijima, T. [36 ,37 ]
机构
[1] Univ Turin, I-10124 Turin, Italy
[2] Univ Basque Country UPV EHU, Bilbao 48080, Spain
[3] Beihang Univ, Beijing 100191, Peoples R China
[4] Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia
[5] Novosibirsk State Univ, Novosibirsk 630090, Russia
[6] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague, Czech Republic
[7] Chiba Univ, Chiba 2638522, Japan
[8] Univ Cincinnati, Cincinnati, OH 45221 USA
[9] DESY, D-22607 Hamburg, Germany
[10] Fu Jen Catholic Univ, Dept Phys, Taipei 24205, Taiwan
[11] Univ Giessen, D-35392 Giessen, Germany
[12] Hanyang Univ, Seoul 133791, South Korea
[13] Univ Hawaii, Honolulu, HI 96822 USA
[14] Natl Lab High Energy Phys, KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 305, Japan
[15] Ikerbasque, Bilbao 48011, Spain
[16] Indian Inst Technol Guwahati, Gauhati 781039, Assam, India
[17] Indian Inst Technol, Madras 600036, Tamil Nadu, India
[18] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[19] Inst High Energy Phys, A-1050 Vienna, Austria
[20] Inst High Energy Phys, Protvino 142281, Russia
[21] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[22] Inst Theoret & Expt Phys, Moscow 117218, Russia
[23] Jozef Stefan Inst, Ljubljana 1000, Slovenia
[24] Kanagawa Univ, Yokohama, Kanagawa 2218686, Japan
[25] Karlsruher Inst Technol, Inst Expt Kernphys, D-76131 Karlsruhe, Germany
[26] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan
[27] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea
[28] Korea Univ, Seoul 136713, South Korea
[29] Kyungpook Natl Univ, Taegu 702701, South Korea
[30] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland
[31] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
[32] Luther Coll, Decorah, IA 52101 USA
[33] Univ Maribor, SLO-2000 Maribor, Slovenia
[34] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[35] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia
[36] Moscow Phys Engn Inst, Moscow 115409, Russia
[37] Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 4648602, Japan
[38] Nagoya Univ, Kobayashi Maskawa Inst, Nagoya, Aichi 4648602, Japan
[39] Nara Womens Univ, Nara 6308506, Japan
[40] Natl Cent Univ, Chungli 32054, Taiwan
[41] Natl United Univ, Miaoli 36003, Taiwan
[42] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
[43] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[44] Nippon Dent Univ, Niigata 9518580, Japan
[45] Niigata Univ, Niigata 9502181, Japan
[46] Osaka City Univ, Osaka 5588585, Japan
[47] Pacific NW Natl Lab, Richland, WA 99352 USA
[48] Panjab Univ, Chandigarh 160014, India
[49] Univ Pittsburgh, Pittsburgh, PA 15260 USA
[50] Univ Sci & Technol China, Hefei 230026, Peoples R China
基金
澳大利亚研究理事会; 中国国家自然科学基金; 奥地利科学基金会; 新加坡国家研究基金会; 瑞士国家科学基金会; 美国国家科学基金会; 日本学术振兴会;
关键词
CP-VIOLATION; ASYMMETRIES;
D O I
10.1103/PhysRevD.89.072008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a study of the branching fraction of the decay B-0 -> rho(0)rho(0) and the fraction of longitudinally polarized rho(0) mesons in this decay. The results are obtained from the final data sample containing 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We find 166 +/- 59 B-0 -> rho(0)rho(0) events (including systematic uncertainties), corresponding to a branching fraction of B(B-0 -> rho(0)rho(0)) = (1.02 +/- 0.30(stat) +/- 0.15(syst)) x 10(-6) with a significance of 3.4 standard deviations and a longitudinal polarization fraction f(L) = 0.21(-0.22)(+0.18()stat) +/- 0.15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle phi(2) = (84.9 +/- 13.5)degrees through an isospin analysis in the B ->rho rho system. We furthermore find 125 +/- 41 B-0 -> f(0)rho(0) events, corresponding to B(B-0 -> f(0)rho(0)) x B(f(0) -> pi(+)pi(-)) = (0.78 +/- 0.22(stat) +/- 0.11(syst)) x 10(-6), with a significance of 3.1 standard deviations. We find no other significant contribution with the same final state, and set upper limits at 90% confidence level on the (product) branching fractions, B(B-0 -> pi(+)pi(-)pi(+)pi(-)) < 11.2 x 10(-6), B(B-0 -> rho(0)pi(+)pi(-)) < 12.0 x 10(-6), B(B-0 -> f(0)pi(+)pi(-)) x B(f(0) -> pi(+)pi(-)) < 3.0 x 10(-6) and B(B-0 -> f(0)f(0)) x B(f(0) -> pi(+)pi(-))(2) < 0.2 x 10(-6).
引用
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页数:16
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