Observation of anomalous Y(1S)π+π- and Y(2S)π+π- production near the Y(5S) resonance

被引：153

作者：

Chen, K. -F. ^{[24
]}

Hou, W. -S. ^{[24
]}

Shapkin, M. ^{[10
]}

Sokolov, A. ^{[10
]}

Adachi, I. ^{[7
]}

Aihara, H. ^{[39
]}

Arinstein, K. ^{[1
]}

Aulchenko, V. ^{[1
]}

Aushev, T. ^{[11
,16
]}

Bakich, A. M. ^{[36
]}

Balagura, V. ^{[11
]}

Bay, A. ^{[16
]}

Belous, K. ^{[10
]}

Bhardwaj, V. ^{[31
]}

Bitenc, U. ^{[12
]}

Bondar, A. ^{[1
]}

Bozek, A. ^{[25
]}

Bracko, M. ^{[12
,18
]}

Brodzicka, J. ^{[7
]}

Browder, T. E. ^{[6
]}

Chang, P. ^{[24
]}

Chao, Y. ^{[24
]}

Chen, A. ^{[22
]}

Chen, W. T. ^{[22
]}

Chistov, R. ^{[11
]}

Choi, Y. ^{[35
]}

Dalseno, J. ^{[19
]}

Danilov, M. ^{[11
]}

Dash, M. ^{[43
]}

Drutskoy, A. ^{[3
]}

Eidelman, S. ^{[1
]}

Gabyshev, N. ^{[1
]}

Golob, B. ^{[12
,17
]}

Ha, H. ^{[14
]}

Haba, J. ^{[7
]}

Hayasaka, K. ^{[20
]}

Hayashii, H. ^{[21
]}

Hazumi, M. ^{[7
]}

Heffernan, D. ^{[30
]}

Hoshi, Y. ^{[38
]}

Hsiung, Y. B. ^{[24
]}

Hyun, H. J. ^{[15
]}

Iijima, T. ^{[20
]}

Inami, K. ^{[20
]}

Ishikawa, A. ^{[32
]}

Ishino, H. ^{[40
]}

Itoh, R. ^{[7
]}

Iwasaki, M. ^{[39
]}

Iwasaki, Y. ^{[7
]}

Kah, D. H. ^{[15
]}

机构：

[1] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[2] Chiba Univ, Chiba, Japan

[3] Univ Cincinnati, Cincinnati, OH 45221 USA

[4] Univ Giessen, Giessen, Germany

[5] Hanyang Univ, Seoul 133791, South Korea

[6] Univ Hawaii, Honolulu, HI 96822 USA

[7] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[8] Chinese Acad Scic, Inst High Energy Phys, Beijing, Peoples R China

[9] Inst High Energy Phys, Vienna, Austria

[10] Inst High Energy Phys, Protvino, Russia

[11] Inst Theoret & Expt Phys, Moscow, Russia

[12] Jozef Stefan Inst, Ljubljana, Slovenia

[13] Kanagawa Univ, Yokohama, Kanagawa, Japan

[14] Korea Univ, Seoul 136701, South Korea

[15] Kyungpook Natl Univ, Taegu 702701, South Korea

[16] Ecole Polytech Fed Lausanne, Lausanne, Switzerland

[17] Univ Ljubljana, Fac Math & Phys, Ljubljana, Slovenia

[18] Univ Maribor, SLO-2000 Maribor, Slovenia

[19] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia

[20] Nagoya Univ, Nagoya, Aichi, Japan

[21] Nara Womens Univ, Nara 630, Japan

[22] Natl Cent Univ, Chungli 32054, Taiwan

[23] Natl United Univ, Miaoli, 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] Saga Univ, Saga 840, Japan

[33] Univ Sci & Technol China, Hefei 230026, Peoples R China

[34] Seoul Natl Univ, Seoul, South Korea

[35] Sungkyunkwan Univ, Suwon, South Korea

[36] Univ Sydney, Sydney, NSW 2006, Australia

[37] Toho Univ, Funabashi, Chiba 274, Japan

[38] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan

[39] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[40] Tokyo Inst Technol, Tokyo 152, Japan

[41] Tokyo Metropolitan Univ, Tokyo 158, Japan

[42] Tokyo Univ Agr & Technol, Tokyo, Japan

[43] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[44] Yonsei Univ, Seoul 120749, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.100.112001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first observation of e(+)e(-) -> Y(1S)pi(+)pi(-), Upsilon(2S)pi(+)pi(-), and first evidence for e(+)e(-) -> Y(3S)pi(+)pi(-), Y(1S)K+K-, near the peak of the Y(5S) resonance at root s similar to 10.87 GeV. The results are based on a data sample of 21.7 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) collider. Attributing the signals to the Upsilon(5S) resonance, the partial widths Gamma(Y(5S) -> Y(1S)pi(+)pi(-)) = 0.59 +/- 0.04(stat)+/- 0.09(syst) MeV and Gamma(Y(5S) -> Y(2S)pi(+)pi(-)) = 0.85 +/- 0.07(stat)+/- 0.16(syst) MeV are obtained from the observed cross sections. These values exceed by more than 2 orders of magnitude the previously measured partial widths for dipion transitions between lower Y resonances.

引用

页数：6

共 50 条

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