Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/ψ→γp(p)over-bar deecays -: art. no. 022001

被引：348

作者：

Bai, JZ ^{[1
]}

Ban, Y

Bian, JG

Cai, X

Chang, JF

Chen, HF

Chen, HS

Chen, J

Chen, JC

Chen, YB

Chi, SP

Chu, YP

Cui, XZ

Dai, YM

Dai, YS

Dong, LY

Du, SX

Du, ZZ

Dunwoodie, W

Fang, J

Fang, SS

Fu, CD

Fu, HY

Fu, LP

Gao, CS

Gao, ML

Gao, YN

Gong, MY

Gong, WX

Gu, SD

Guo, YN

Guo, YQ

Guo, ZJ

Han, SW

Harris, FA

He, J

He, KL

He, M

He, X

Heng, YK

Hong, T

Hu, HM

Hu, T

Huang, GS

Huang, L

Huang, XP

Izen, JM

Ji, XB

Jiang, CH

机构：

[1] Inst High Energy Phys, Beijing 100039, Peoples R China

[2] China Ctr Adv Sci & Technol, Beijing 100080, Peoples R China

[3] Colorado State Univ, Ft Collins, CO 80523 USA

[4] Henan Normal Univ, Xinxiang 453002, Peoples R China

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

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

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

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

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

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

[11] Shanghai Jiao Tong Univ, Shanghai 200030, Peoples R China

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

[13] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

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

[15] Univ Hawaii, Honolulu, HI 96822 USA

[16] Univ Sci & Technol China, Anhua 230026, Peoples R China

[17] Univ Texas, Richardson, TX 75083 USA

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

[19] Zhejiang Univ, Hangzhou 310028, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.91.022001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of p (p) over bar pairs from radiative J/psi-->gammap (p) over bar decays. No similar structure is seen in J/psi-->pi(0)p (p) over bar decays. The results are based on an analysis of a 58x10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(-10)(+3) (stat)(-25)(+5)(syst) MeV/c(2) and the total width is Gamma<30 MeV/c(2) at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.

引用

页码：1 / 022001

页数：5

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