Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle

Y Seino; K Hayasaka; S Uehara; I Adachi; H Aihara; S Al Said; DM Asner; H Atmacan; T Aushev; R Ayad; V Babu; S Bahinipati; P Behera; K Belous; J Bennett; M Bessner; V Bhardwaj; B Bhuyan; T Bilka; D Bodrov; G Bonvicini; J Borah; A Bozek; M Bračko; P Branchini; TE Browder; A Budano; M Campajola; D Červenkov; MC Chang; P Chang; V Chekelian; A Chen; BG Cheon; K Chilikin; HE Cho; K Cho; SJ Cho; SK Choi; Y Choi; S Choudhury; D Cinabro; S Das; G De Pietro; R Dhamija; F Di Capua; J Dingfelder; Z Doležal; TV Dong; D Epifanov; T Ferber; D Ferlewicz; BG Fulsom; R Garg; V Gaur; N Gabyshev; A Garmash; A Giri; P Goldenzweig; E Graziani; C Hadjivasiliou; H Hayashii; WS Hou; CL Hsu; K Inami; N Ipsita; A Ishikawa; R Itoh; M Iwasaki; WW Jacobs; EJ Jang; S Jia; Y Jin; KK Joo; H Kakuno; KH Kang; G Karyan; T Kawasaki; C Kiesling; CH Kim; DY Kim; KH Kim; YK Kim; P Kodyš; T Konno; A Korobov; S Korpar; E Kovalenko; P Križan; P Krokovny; M Kumar; R Kumar; K Kumara; T Lam; JS Lange; SC Lee; CH Li; J Li; LK Li; Y Li

Journal article

Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle

Y Seino, K Hayasaka, S Uehara, I Adachi, H Aihara, S Al Said, DM Asner, H Atmacan, T Aushev, R Ayad, V Babu, S Bahinipati, P Behera, K Belous, J Bennett, M Bessner, V Bhardwaj, B Bhuyan, T Bilka, D Bodrov Show all

Journal of High Energy Physics | SPRINGER | Published : 2023

DOI: 10.1007/JHEP01(2023)160

Abstract

We report the measurement of the two-photon decay width of χc2(1P) in two-photon processes at the Belle experiment. We analyze the process γγ → χc2(1P) → J/ψγ, J/ψ → ℓ+ℓ− (ℓ = e or μ) using a data sample of 971 fb−1 collected with the Belle detector at the KEKB e+e− collider. In this analysis, the product of the two-photon decay width of χc2(1P) and the branching fraction is determined to be Γγγ(χc2(1P))B(χc2(1P)→J/ψγ)B(J/ψ→ℓ+ℓ−)=14.8±0.3(stat.)±0.7(syst.) eV, which corresponds to Γγγ(χc2(1P)) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B(χc2(1P) → J/ψγ) and B(J/ψ → ℓ+ℓ−). [Figure not available: see fulltext.].

University of Melbourne Researchers

Eiasha Waheed Author

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Grants

Awarded by Horizon 2020 Framework Programme

Funding Acknowledgements

This work, based on data collected using the Belle detector, which was operated untilJune 2010, was supported by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council including grants DP180102629, DP170102389, DP170102204, DE220100462, DP150103061, FT130100303; Austrian Federal Ministry of Education, Science and Research (FWF) and FWF Austrian Science Fund No. P 31361-N36; the National Natural Science Foundation of China under Contracts No. 11675166, No. 11705209; No. 11975076; No. 12135005; No. 12175041; No. 12161141008; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS), Grant No. QYZDJ-SSW-SLH011; Project ZR2022JQ02 supported by Shandong Provincial Natural Science Foundation; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Czech Science Foundation Grant No. 22-18469S; Horizon 2020 ERC Advanced Grant No. 884719 and ERC Starting Grant No. 947006 "InterLeptons" (European Union); the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the Volkswagen-Stiftung; the Department of Atomic Energy (Project Identification No. RTI 4002) and the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grant Nos. 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, RS202200197659, 2019R1I1A3A01058933, 2021R1A6A1A03043957, 2021R1F1A1060423, 2021R1F1A1064008, 2022R1A2C1003993;Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of the Korea Instituteof Science and Technology Information and KREONET/GLORIAD; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Science and Higher Education of the Russian Federation, Agreement 14.W03.31.0026, and the HSE University Basic Research Program, Moscow; University of Tabuk research grants S-1440-0321, S-0256-1438, and S-0280-1439 (Saudi Arabia); the Slovenian Research Agency Grant Nos. J1-9124 and P1-0135; Ikerbasque, Basque Foundation for Science, Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation. These acknowledgements are not to be interpreted as an endorsement of any statement made by any of our institutes, funding agencies, governments, or their representatives. We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group and the Pacific Northwest National Laboratory (PNNL) Environmental Molecular Sciences Laboratory (EMSL) computing group for strong computing support;and the National Institute of Informatics, and Science Information NETwork 6 (SINET6) for valuable network support.