Spin-Parity Analysis of p(p)over-bar Mass Threshold Structure in J/ψ and ψ(3686) Radiative Decays

被引：88

作者：

Ablikim, M. ^{[1
]}

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

Alberto, D. ^{[41
,42
]}

Ambrose, D. J. ^{[38
]}

An, F. F. ^{[1
]}

An, Q. ^{[39
]}

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

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

Ferroli, R. B. F. Baldini ^{[17
]}

Ban, Y. ^{[25
]}

Becker, J. ^{[2
]}

Berger, N. ^{[1
]}

Bertani, M. B. ^{[17
]}

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

Boger, E. ^{[18
,46
]}

Bondarenko, O. ^{[19
]}

Boyko, I. ^{[18
]}

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

Bytev, V. ^{[18
]}

Cai, X. ^{[1
]}

Calcaterra, A. C. ^{[17
]}

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

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

Chelkov, G. ^{[18
,46
]}

Chen, G. ^{[1
]}

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

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

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

Chen, S. J. ^{[23
]}

Chen, Y. ^{[1
]}

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

Cheng, H. P. ^{[13
]}

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

Cronin-Hennessy, D. ^{[37
]}

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

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

Dedovich, D. ^{[18
]}

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

Denysenko, I. ^{[18
]}

Destefanis, M. ^{[41
,42
]}

Ding, W. L. Ding ^{[27
]}

Ding, Y. ^{[21
]}

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

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

Du, S. X. ^{[45
]}

Fang, J. ^{[1
]}

Fang, S. S. ^{[1
]}

Feng, C. Q. ^{[39
]}

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

Fu, J. L. ^{[23
]}

机构：

[1] 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] Hangzhou Normal Univ, Hangzhou 541004, Zhejiang, Peoples R China

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

[12] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China

[13] Huangshan Coll, Huangshan 245000, Peoples R China

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

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

[16] Indiana Univ, Bloomington, IN 47405 USA

[17] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

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

[19] Univ Groningen, KVI Univ Groningen, NL-9747 AA Groningen, Netherlands

[20] Lanzhou Univ, Lanzhou 730000, Peoples R China

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

[22] Nanjing Normal Univ, Nanjing 210046, Jiangsu, Peoples R China

[23] Nanjing Univ, Nanjing 210093, Jiangsu, Peoples R China

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

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

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

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

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

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

[30] Soochow Univ, Suzhou 215006, Peoples R China

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

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

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

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

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

[36] Univ Hawaii, Honolulu, HI 96822 USA

[37] Univ Minnesota, Minneapolis, MN 55455 USA

[38] Univ Rochester, Rochester, NY 14627 USA

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

[40] Univ Punjab, Lahore 54590, Pakistan

[41] Univ Turin, Turin, Italy

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

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

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

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

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

[47] PNPI, Gatchina, Russia

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 11期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 俄罗斯基础研究基金会; 中国国家自然科学基金;

关键词：

ENHANCEMENT; STATE;

D O I：

10.1103/PhysRevLett.108.112003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A partial wave analysis of the p (p) over bar mass-threshold enhancement in the reaction J/psi -> gamma p (p) over bar is used to determine its J(PC) quantum numbers to be 0(-+), its peak mass to be below threshold at M 1832(-5)(+19)(stat)(-17)(+18)(syst) +/- 19(model) MeV/c(2), and its total width to be Gamma < 76 MeV/c(2) at the 90% C. L. The product of branching ratios is measured to be BR[J/psi -> gamma X(p<(p)over bar>)]BR[X(p (p) over bar) -> p (p) over bar] = [9:0(-1.1)(+0.4)(stat)(-5.0)(+1:5)(syst) +/- 2: 3(model)] x 10(-5). A similar analysis performed on psi(3686) -> gamma p (p) over bar decays shows, for the first time, the presence of a corresponding enhancement with a production rate relative to that for J/psi decays of R = [5.08(-0.45)(+0: 71)(stat)(-058)(+0: 67) (syst) +/- 0: 12(model)%.

引用

页数：6

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