Observation of a p(p)over-bar mass threshold enhancement in ψ′ → π+π-J/ψ(J/ψ → γp(p)over-bar) decay

被引：62

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[5
]}

An, L. ^{[9
]}

An, Q. ^{[31
]}

An, Z. H. ^{[1
]}

Bai, J. Z. ^{[1
]}

Ban, Y. ^{[18
]}

Berger, N. ^{[1
]}

Bian, J. M. ^{[1
]}

Boyko, I. ^{[13
]}

Briere, R. A. ^{[3
]}

Bytev, V. ^{[13
]}

Cai, X. ^{[1
]}

Cao, G. F. ^{[1
]}

Cao, X. X. ^{[1
]}

Chang, J. F. ^{[1
]}

Chelkov, G. ^{[13
,38
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
]}

Chen, J. C. ^{[1
]}

Chen, L. P. ^{[1
]}

Chen, M. L. ^{[1
]}

Chen, P. ^{[1
]}

Chen, S. J. ^{[16
]}

Chen, Y. B. ^{[1
]}

Chu, Y. P. ^{[1
]}

Cronin-Hennessy, D. ^{[30
]}

Dai, H. L. ^{[1
]}

Dai, J. P. ^{[1
]}

Dedovich, D. ^{[13
]}

Deng, Z. Y. ^{[1
]}

Denysenko, I. ^{[13
]}

Destefanis, M. ^{[32
,33
]}

Ding, Y. ^{[14
]}

Dong, L. Y. ^{[1
]}

Dong, M. Y. ^{[1
]}

Du, S. X. ^{[37
]}

Duan, M. Y. ^{[21
]}

Fang, J. ^{[1
]}

Feng, C. Q. ^{[31
]}

Fu, C. D. ^{[1
]}

Fu, J. L. ^{[16
]}

Gao, Y. ^{[27
]}

Geng, C. ^{[31
]}

Goetzen, K. ^{[7
]}

Gong, W. X. ^{[1
]}

Greco, M. ^{[32
,33
]}

Grishin, S. ^{[13
]}

Gu, Y. T. ^{[9
]}

Guo, A. Q. ^{[17
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

[3] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[4] China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China

[5] GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia

[6] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[7] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany

[8] Guangxi Normal Univ, Guilin 541004, Peoples R China

[9] Guangxi Univ, Nanning 530004, Peoples R China

[10] Henan Normal Univ, Xinxiang 453007, Peoples R China

[11] Huazhong Normal Univ, Wuhan 430079, Peoples R China

[12] Hunan Univ, Changsha 410082, Hunan, Peoples R China

[13] Joint Inst Nucl Res, Dubna 141980, Russia

[14] Liaoning Univ, Shenyang 110036, Peoples R China

[15] Nanjing Normal Univ, Nanjing 210046, Peoples R China

[16] Nanjing Univ, Nanjing 210093, Peoples R China

[17] Nankai Univ, Tianjin 300071, Peoples R China

[18] Peking Univ, Beijing 100871, Peoples R China

[19] Seoul Natl Univ, Seoul 151747, South Korea

[20] Shandong Univ, Jinan 250100, Peoples R China

[21] Shanxi Univ, Taiyuan 030006, Peoples R China

[22] Sichuan Univ, Chengdu 610064, Peoples R China

[23] Sun Yat Sen Univ, Guangzhou 510275, Guangdong, Peoples R China

[24] Chinese Univ Hong Kong, Shatin, Hong Kong, Peoples R China

[25] Univ Hong Kong, Pokfulam, Hong Kong, Peoples R China

[26] Univ Tokyo, Tokyo 1130033, Japan

[27] Tsinghua Univ, Beijing 100084, Peoples R China

[28] Univ Giessen, D-35392 Giessen, Germany

[29] Univ Hawaii, Honolulu, HI 96822 USA

[30] Univ Minnesota, Minneapolis, MN 55455 USA

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

[32] Univ Turin, Turin, Italy

[33] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[34] Univ Washington, Seattle, WA 98195 USA

[35] Wuhan Univ, Wuhan 430072, Peoples R China

[36] Zhejiang Univ, Hangzhou 310027, Peoples R China

[37] Zhengzhou Univ, Zhengzhou 450001, Peoples R China

[38] Moscow Inst Phys & Technol, Moscow, Russia

[39] PNPI, Gatchina, Russia

来源：

CHINESE PHYSICS C | 2010年 / 34卷 / 04期

基金：

中国国家自然科学基金; 新加坡国家研究基金会; 俄罗斯基础研究基金会;

关键词：

p(p)over-bar; threshold enhancement; SCATTERING;

D O I：

10.1088/1674-1137/34/4/001

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The decay channel psi' -> pi(+)pi(-)J/psi(J/psi -> gamma p (p) over bar) is studied using a sample of 1.06 x 10(8) psi' events collected by the BESIII experiment at BEPCII. A strong enhancement at threshold is observed in the pp invariant mass spectrum. The enhancement can be fitted with an S-wave Breit-Wigner resonance function with a resulting peak mass of M = 1861(-13)(+6) (stat)(-26)(+7) (syst) MeV/c(2) and a narrow width that is Gamma < 38 MeV/c(2) at the 90% confidence level. These results are consistent with published BESII results. These mass and width values do not match with well established mesons.

引用

页码：421 / 426

页数：6

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