Study of the Dalitz decay J/ψ → e+e-η

被引：11

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[9
,73
]}

Ahmed, S. ^{[14
]}

Albrecht, M. ^{[4
]}

Alekseev, M. ^{[62
,64
]}

Amoroso, A. ^{[53
,59
,62
,64
]}

An, F. F. ^{[1
,45
,46
]}

An, Q. ^{[59
]}

Bai, Y. ^{[44
]}

Bakina, O. ^{[29
]}

Ferroli, R. Baldini ^{[22
]}

Ban, Y. ^{[37
]}

Begzsuren, K. ^{[27
]}

Bennett, D. W. ^{[21
]}

Bennett, J. V.

Berger, N. ^{[28
]}

Bertani, M. ^{[22
]}

Bettoni, D. ^{[25
]}

Bianchi, F. ^{[62
,64
]}

Boger, E. ^{[29
,71
]}

Boyko, I. ^{[29
]}

Briere, R. A. ^{[5
]}

Cai, H. ^{[66
]}

Cai, X. ^{[1
,45
,46
]}

Cakir, O. ^{[49
]}

Calcaterra, A. ^{[22
]}

Cao, G. F. ^{[1
,53
]}

Cetin, S. A. ^{[50
]}

Chai, J. ^{[64
]}

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

Chang, W. L. ^{[1
,53
]}

Chelkov, G. ^{[29
,71
]}

Chen, G.

Chen, H. S. ^{[1
,53
]}

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

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

Chen, P. L. ^{[60
]}

Chen, S. J. ^{[35
]}

Chen, X. R. ^{[32
]}

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

Chu, X. K. ^{[37
]}

Cibinetto, G. ^{[25
]}

Cossio, F. ^{[64
]}

Dai, H. L. ^{[1
,45
,46
]}

Dai, J. P. ^{[40
,77
,78
,79
]}

Dbeyssi, A. ^{[14
]}

Dedovich, D. ^{[29
]}

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

Denig, A. ^{[28
]}

机构：

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

[2] Beihang Univ, Beijing 100191, Peoples R China

[3] Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China

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

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

[6] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China

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

[8] COMSATS Inst Informat Technol, Def Rd,Raiwind Rd, Lahore, Pakistan

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

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

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

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

[13] Hangzhou Normal Univ, Hangzhou 310036, Zhejiang, Peoples R China

[14] Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

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

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

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

[18] Hunan Normal Univ, Changsha 410081, Hunan, Peoples R China

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

[20] Indian Inst Technol Madras, Madras 600036, Tamil Nadu, India

[21] Indiana Univ, Bloomington, IN 47405 USA

[22] INFN, Lab Nazl Frascati, I-00044 Frascati, Italy

[23] INFN, I-06100 Perugia, Italy

[24] Univ Perugia, I-06100 Perugia, Italy

[25] INFN, Sez Ferrara, I-44122 Ferrara, Italy

[26] Univ Ferrara, I-44122 Ferrara, Italy

[27] Inst Phys & Technol, Peace Ave 54B, Ulaanbaatar 13330, Mongolia

[28] Johannes Gutenberg Univ Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[29] Joint Inst Nucl Res, Moscow 141980, Russia

[30] Justus Liebig Univ Giessen II, Phys Inst, Heinrich Buff Ring 16, D-35392 Giessen, Germany

[31] Univ Groningen, KVI CART, NL-9747 AA Groningen, Netherlands

[32] Lanzhou Univ, Lanzhou 730000, Gansu, Peoples R China

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

[34] Nanjing Normal Univ, Nanjing 210023, Jiangsu, Peoples R China

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

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

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

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

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

[40] Shanghai Jiao Tong Univ, Shanghai 200240, Peoples R China

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

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

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

[44] Southeast Univ, Nanjing 211100, Jiangsu, Peoples R China

[45] State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China

[46] State Key Lab Particle Detect & Elect, Hefei 230026, Anhui, Peoples R China

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

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

[49] Ankara Univ, TR-06100 Ankara, Turkey

[50] Istanbul Bilgi Univ, TR-34060 Istanbul, Turkey

来源：

PHYSICAL REVIEW D | 2019年 / 99卷 / 01期

基金：

中国国家自然科学基金; 新加坡国家研究基金会; 瑞典研究理事会;

关键词：

DARK PHOTON; ETA-E(+)E(-); EMISSION; SEARCH; MESON; OMEGA; PAIR; PHI; ETA;

D O I：

10.1103/PhysRevD.99.012006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the electromagnetic Dalitz decay J/psi -> e(+)e(-)eta and search for dielectron decays of a dark gauge boson (gamma') in J/psi -> gamma'eta with the two q decay modes eta -> gamma gamma and eta -> pi(+)pi(-)pi(0) using (1310.6 +/- 7.0) x 10(6) J/psi events collected with the BESIII detector. The branching fraction of J/psi -> e(+)e(-)eta is measured to be (1.43 +/- 0.04(stat) +/- 0.06(syst)) x 10(-5), with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Lambda = 2.84 +/- 0.11(stat) +/- 0.08(syst) GeV/c(2). We find no evidence of gamma' production and set 90% confidence level upper limits on the product branching fraction B(J/psi -> gamma'eta) x B(gamma' -> e(+)e(-)) as well as the kinetic mixing strength between the standard model photon and gamma' in the mass range of 0.01 <= m(gamma') <= 2.4 GeV/c(2).

引用

页数：13

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