Observation of the decay Υ(4S)→Υ(1S)π+ π-

被引：32
|
作者：
Sokolov, A. [1 ]
Shapkin, M.
Abe, K.
Abe, K.
Adachi, I.
Aihara, H.
Anipko, D.
Aushev, T.
Bakich, A. M.
Barberio, E.
Barbero, M.
Bedny, I.
Belous, K.
Bitenc, U.
Bizjak, I.
Bondar, A.
Bracko, M.
Browder, T. E.
Chen, A.
Chen, W. T.
Cheon, B. G.
Chistov, R.
Choi, Y.
Choi, Y. K.
Cole, S.
Dalseno, J.
Dash, M.
Drutskoy, A.
Eidelman, S.
Epifanov, D.
Fratina, S.
Gershon, T.
Go, A.
Gokhroo, G.
Golob, B.
Ha, H.
Haba, J.
Hara, T.
Hasegawa, Y.
Hayasaka, K.
Hayashii, H.
Hazumi, M.
Heffernan, D.
Hoshi, Y.
Hou, S.
Hou, W.-S.
Hsiung, Y. B.
Iijima, T.
Inami, K.
Ishikawa, A.
机构：
[1] Inst High Energy Phys, Protvino, Russia
[2] Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[3] Chiba Univ, Chiba, Japan
[4] Chonnam Natl Univ, Kwangju, South Korea
[5] Univ Cincinnati, Cincinnati, OH 45221 USA
[6] Grad Univ Adv Studies, Hayana, Japan
[7] Univ Hawaii, Honolulu, HI 96822 USA
[8] Jigh Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan
[9] Hiroshima Inst Technol, Hiroshima, Japan
[10] Univ Illinois, Urbana, IL 61801 USA
[11] Inst High Energy Phys, Vienna, Austria
[12] Inst Theoret & Expt Phys, Moscow 117259, Russia
[13] J Stefan Inst, Ljubljana, Slovenia
[14] Kanagawa Univ, Yokohama, Kanagawa, Japan
[15] Korea Univ, Seoul 136701, South Korea
[16] Kyungpook Natl Univ, Taegu 702701, South Korea
[17] Swiss Fed Inst Technol, EPFL, CH-1015 Lausanne, Switzerland
[18] Univ Ljubljana, Ljubljana, Slovenia
[19] Univ Maribor, SLO-2000 Maribor, Slovenia
[20] Univ Melbourne, Melbourne, Vic, Australia
[21] Nagoya Univ, Nagoya, Aichi, Japan
[22] Nara Womens Univ, Nara 630, Japan
[23] Natl Cent Univ, Chungli 32054, Taiwan
[24] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
[25] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
[26] Nippon Dent Univ, Niigata, Japan
[27] Niigata Univ, Niigata, Japan
[28] Univ Nova Gorica, Nova Gorica, Slovenia
[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] RIKEN BNL Res Ctr, Upton, NY 11973 USA
[34] Saga Univ, Saga 840, Japan
[35] Univ Sci & Technol China, Hefei 230026, Peoples R China
[36] Shinshu Univ, Nagano, Japan
[37] Sungkyunkwan Univ, Suwon, South Korea
[38] Univ Sydney, Sydney, NSW 2006, Australia
[39] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
[40] Toho Univ, Funabashi, Chiba 274, Japan
[41] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan
[42] Tohoku Univ, Sendai, Miyagi 980, Japan
[43] Univ Tokyo, Dept Phys, Tokyo 113, Japan
[44] Tokyo Inst Technol, Tokyo 152, Japan
[45] Tokyo Metropolitan Univ, Tokyo 158, Japan
[46] Tokyo Univ Agr & Technol, Tokyo, Japan
[47] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[48] Yonsei Univ, Seoul 120749, South Korea
来源：
PHYSICAL REVIEW D | 2007年 / 75卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.75.071103
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study transitions between Y states with the emission of charged pions using 477 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The measured product branching fraction B(Y(4S)-> Y(1S)pi(+)pi(-))xB(Y(1S)->mu(+)mu(-))=(4.42 +/- 0.81(stat)+/- 0.56(sys))x10(-6). When the PDG value for B(Y(1S)->mu(+)mu(-)) is used, this corresponds to B(Y(4S)-> Y(1S)pi(+)pi(-))=(1.78 +/- 0.33(stat)+/- 0.23(sys))x10(-4) and a partial decay width Gamma(Y(4S)-> Y(1S)pi(+)pi(-))=(3.65 +/- 0.67(stat)+/- 0.65(sys)) keV.
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页数：6
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