Direct Measurement of the Branching Fractions B(ψ(3686) → J/ψX) and B(ψ(3770) → J/ψX), and Observation of the State R(3760) in e+e- → J/ψX

被引：1

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[9
,76
]}

Adlarson, P. ^{[69
]}

Ahmed, S. ^{[14
]}

Albrecht, M. ^{[4
]}

Amoroso, A. ^{[66
,68
]}

An, Q. ^{[49
,63
]}

Anita ^{[20
]}

Bai, Y. ^{[48
]}

Bakina, O. ^{[30
]}

Ferroli, R. Baldini ^{[22
]}

Balossino, I. ^{[25
]}

Ban, Y. ^{[39
,86
]}

Begzsuren, K. ^{[28
]}

Bennett, J. V. ^{[5
]}

Berger, N. ^{[29
]}

Bertani, M. ^{[22
]}

Bettoni, D. ^{[25
]}

Bianchi, F. ^{[66
,68
]}

Biernat, J. ^{[69
]}

Bloms, J. ^{[60
]}

Bortone, A. ^{[66
,68
]}

Boyko, I. ^{[30
]}

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

Cai, H. ^{[70
]}

Cai, X. ^{[1
,49
]}

Calcaterra, A. ^{[22
]}

Cao, G. F. ^{[1
,55
]}

Cao, N. ^{[1
,55
]}

Cetin, A. ^{[53
]}

Chang, J. F. ^{[1
,49
]}

Chang, W. L. ^{[1
,55
]}

Chelkov, G. ^{[30
,74
,75
]}

Chen, D. Y. ^{[6
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,55
]}

Chen, M. L. ^{[1
,49
]}

Chen, S. J. ^{[37
]}

Chen, X. R. ^{[27
]}

Chen, Y. B. ^{[1
,49
]}

Cheng, W. ^{[68
]}

Cibinetto, G. ^{[25
]}

Cossio, F. ^{[68
]}

Cui, X. F. ^{[38
]}

Dai, H. L. ^{[1
,49
]}

Dai, J. P. ^{[43
,80
,81
,82
]}

Dai, X. C. ^{[1
,55
]}

Dbeyssi, A. ^{[1
,13
]}

de Boer, R. B. ^{[4
]}

Dedovich, D. ^{[30
]}

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, Peoples R China

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

[8] Fudan Univ, Shanghai 200443, Peoples R China

[9] RAS, GI Budker Inst Nucl Phys, SB, BINP, 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, Peoples R China

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

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

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

[20] Indian Inst Technol Madras, Chennai 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 Modern Phys, Lanzhou 730000, Peoples R China

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

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

[30] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[31] Justus Liebig Univ Giessen, Phys Inst 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany

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

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

[34] Liaoning Normal Univ, Dalian 116029, Peoples R China

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

[36] Nanjing Normal Univ, Nanjing 210023, Peoples R China

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

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

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

[40] Qufu Normal Univ, Qufu 273165, Shandong, Peoples R China

[41] Shandong Normal Univ, Jinan 250014, Peoples R China

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

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

[44] Shanxi Normal Univ, Linfen 041004, Shanxi, Peoples R China

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

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

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

[48] Southeast Univ, Nanjing 211100, Peoples R China

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

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

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 08期

基金：

中国国家自然科学基金; 国家重点研发计划; 瑞典研究理事会;

关键词：

CROSS-SECTION; PSI(3770);

D O I：

10.1103/PhysRevLett.127.082002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a measurement of the observed cross sections of e(+)e(-) -> J/psi X based on 3.21 fb(-1) of data accumulated at energies from 3.645 to 3.891 GeV with the BESIII detector operated at the BEPCII collider. In analysis of the cross sections, we measured the decay branching fractions of B(psi(3686 -> J/psi X) = (64.4 +/- 0.6 +/- 1.6)% and B(psi(3770) -> J/psi X) = (0.5 +/- 0.2 +/- 0.1)% for the first time. The energy-dependent line shape of these cross sections cannot be well described by two Breit-Wigner (BW) amplitudes of the expected decays psi(3686) -> J/psi X and psi(3770) -> J/psi X. Instead, it can be better described with one more BW amplitude of the decay R(3760) -> J/psi X. Under this assumption, we extracted the R(3760) mass M-R(3760) = 3766.2 +/- 3.8 +/- 0.4 MeV/c(2), total width Gamma(tot)(R(3760)) = 22.2 +/- 5.9 +/- 1.4 MeV, and product of leptonic width and decay branching fraction Gamma(ee)(R(3760)) B[R(3760) -> J/psi X] = (79.4 +/- 85.5 +/- 11.7) eV. The significance of the R(3760) is 5.3 sigma. The first uncertainties of these measured quantities are from fits to the cross sections and second systematic.

引用

页数：8

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