Improved measurement of the branching fractions for J/ψ → γπ0, γη, and γη′

被引：0

作者：

Ablikim, M. ^{[1
]}

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

Adlarson, P. ^{[83
]}

Ai, X. C. ^{[89
]}

Aliberti, R. ^{[38
]}

Amoroso, A. ^{[46
,78
,79
,82
]}

An, M. R. ^{[42
]}

An, Q. ^{[60
,61
,75
]}

Bai, Y.

Bakina, O. ^{[39
]}

Balossino, I. ^{[31
]}

Ban, Y. ^{[49
]}

Batozskaya, V. ^{[1
,47
]}

Begzsuren, K. ^{[35
]}

Berger, N. ^{[38
]}

Berlowski, M. ^{[47
]}

Bertani, M. ^{[28
]}

Bettoni, D. ^{[31
]}

Bianchi, F. ^{[78
,79
,82
]}

Bianco, E. ^{[78
,79
,82
]}

Bortone, A. ^{[78
,79
,82
]}

Boyko, I. ^{[39
]}

Briere, R. A. ^{[6
]}

Brueggemann, A. ^{[72
]}

Cai, H. ^{[84
]}

Cai, X. ^{[1
,60
,61
]}

Calcaterra, A. ^{[28
]}

Cao, G. F. ^{[1
,67
]}

Cao, N. ^{[1
,67
]}

Cetin, S. A. ^{[65
]}

Chang, J. F. ^{[1
,60
,61
]}

Chang, T. T. ^{[85
]}

Chang, W. L. ^{[1
,67
]}

Che, G. R. ^{[46
]}

Chelkov, G. ^{[39
]}

Chen, C. ^{[46
]}

Chen, Chao

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,67
]}

Chen, M. L. ^{[1
,60
,61
,67
]}

Chen, S. J. ^{[45
]}

Chen, S. M. ^{[64
]}

Chen, T. ^{[1
,67
]}

Chen, X. R. ^{[34
,67
]}

Chen, X. T. ^{[1
,67
]}

Chen, Y. B. ^{[1
,60
,61
]}

Chen, Y. Q. ^{[37
]}

Chen, Z. J. ^{[25
]}

Cheng, W. S. ^{[78
,82
]}

Choi, S. K. ^{[11
]}

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

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

[7] Cent China Normal Univ, Wuhan 430079, Peoples R China

[8] Cent South Univ, Changsha 410083, Peoples R China

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

[10] China Univ Geosci, Wuhan 430074, Peoples R China

[11] Chung Ang Univ, Seoul 06974, South Korea

[12] COMSATS Univ Islamabad, Lahore Campus,Def Rd,Off Raiwind Rd, Lahore 54000, Pakistan

[13] Fudan Univ, Shanghai 200433, Peoples R China

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

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

[16] Hangzhou Normal Univ, Hangzhou 310036, Peoples R China

[17] Hebei Univ, Baoding 071002, Peoples R China

[18] Helmholtz Inst Mainz, Staudinger Weg 18, D-55099 Mainz, Germany

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

[20] Henan Univ, Kaifeng 475004, Peoples R China

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

[22] Henan Univ Technol, Zhengzhou 450001, Peoples R China

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

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

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

[26] Indian Inst Technol Madras, Chennai 600036, Tamil Nadu, India

[27] Indiana Univ, Bloomington, IN 47405 USA

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

[29] INFN Lab Nazl Frascati, INFN Sez Perugia, I-06100 Perugia, Italy

[30] Univ Perugia, INFN Lab Nazl Frascati, I-06100 Perugia, Italy

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

[32] Univ Ferrara, INFN Sez Ferrara, I-44122 Ferrara, Italy

[33] Inner Mongolia Univ, Hohhot 010021, Peoples R China

[34] Inst Modern Phys, Lanzhou 730000, Peoples R China

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

[36] Univ Tarapaca, Inst Alta Invest, Casilla 7D, Arica 1000000, Chile

[37] Jilin Univ, Changchun 130012, Peoples R China

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

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

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

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

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

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

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

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

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

[47] Natl Ctr Nucl Res, PL-02093 Warsaw, Poland

[48] North China Elect Power Univ, Beijing 102206, Peoples R China

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

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

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 09期

基金：

中国博士后科学基金; 瑞典研究理事会; 中国国家自然科学基金; 新加坡国家研究基金会; 国家重点研发计划;

关键词：

RADIATIVE DECAYS; TOF;

D O I：

10.1103/PhysRevD.108.092002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using a data sample of (1.0087 +/- 0.0044) x 10(10) J/psi events collected with the BESIII detector, the decays of J/psi -> gamma pi(0) (eta, eta ') -> gamma gamma gamma are studied. Newly measured branching fractions are B(J/psi -> gamma pi(0)) = (3.34 +/- 0.02 +/- 0.09) x 10(-5), B(J/psi -> gamma eta) = (1.096 +/- 0.001 +/- 0.019) x 10(-3), and B(J/psi -> gamma eta ') = (5.40 +/- 0.01 +/- 0.11) x 10(-3), where the first uncertainties are statistical and the second are systematic. These results are consistent with the world average values within two standard deviations. The ratio of partial widths Gamma(J/psi -> gamma eta ')/Gamma(J/psi -> gamma eta) is measured to be 4.93 +/- 0.13. The singlet-octet pseudoscalar mixing angle theta(P) is determined to be theta(P) = -(22.11 +/- 0.26)degrees or -(19.34 +/- 0.34)degrees with two different phenomenological models.

引用

页数：11

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