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

The Belle Collaboration

doi:10.1007/JHEP01(2023)160

Measurement of two-photon decay width of χ_c2(1P) in γγ → χ_c2(1P) → J/ψγ at Belle

The Belle Collaboration

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We report the measurement of the two-photon decay width of χ_c2(1P) in two-photon processes at the Belle experiment. We analyze the process γγ → χ_c2(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 χ_c2(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 Γ_γγ(χ_c2(1P)) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from B(χ_c2(1P) → J/ψγ) and B(J/ψ → ℓ⁺ℓ⁻). [Figure not available: see fulltext.].

Original language	English
Article number	160
Journal	Journal of High Energy Physics
Volume	2023
Issue number	1
DOIs	https://doi.org/10.1007/JHEP01(2023)160
Publication status	Published - 2023 Feb

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).

Keywords

Quarkonium
e-e Experiments

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1007/JHEP01(2023)160

Cite this

@article{dd6974a1261a4fa49f07c85286b4fbb1,

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

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.].",

keywords = "Quarkonium, e-e Experiments",

author = "{The Belle Collaboration} and Y. Seino and K. Hayasaka and S. Uehara and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and V. Babu and S. Bahinipati and P. Behera and K. Belous and J. Bennett and M. Bessner and V. Bhardwaj and B. Bhuyan and T. Bilka and D. Bodrov and G. Bonvicini and J. Borah and A. Bozek and M. Bra{\v c}ko and P. Branchini and Browder, {T. E.} and A. Budano and M. Campajola and D. {\v C}ervenkov and Chang, {M. C.} and P. Chang and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Cho, {S. J.} and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and S. Das and {De Pietro}, G. and R. Dhamija and {Di Capua}, F. and J. Dingfelder and Z. Dole{\v z}al and Dong, {T. V.} and E. Won",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

month = feb,

doi = "10.1007/JHEP01(2023)160",

language = "English",

volume = "2023",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer Verlag",

number = "1",

}

TY - JOUR

T1 - Measurement of two-photon decay width of χc2(1P) in γγ → χc2(1P) → J/ψγ at Belle

AU - The Belle Collaboration

AU - Seino, Y.

AU - Hayasaka, K.

AU - Uehara, S.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Bahinipati, S.

AU - Behera, P.

AU - Belous, K.

AU - Bennett, J.

AU - Bessner, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Bodrov, D.

AU - Bonvicini, G.

AU - Borah, J.

AU - Bozek, A.

AU - Bračko, M.

AU - Branchini, P.

AU - Browder, T. E.

AU - Budano, A.

AU - Campajola, M.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Cho, S. J.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Das, S.

AU - De Pietro, G.

AU - Dhamija, R.

AU - Di Capua, F.

AU - Dingfelder, J.

AU - Doležal, Z.

AU - Dong, T. V.

AU - Won, E.

PY - 2023/2

Y1 - 2023/2

N2 - 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.].

AB - 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.].

KW - Quarkonium

KW - e-e Experiments

UR - http://www.scopus.com/inward/record.url?scp=85147260654&partnerID=8YFLogxK

U2 - 10.1007/JHEP01(2023)160

DO - 10.1007/JHEP01(2023)160

M3 - Article

AN - SCOPUS:85147260654

SN - 1126-6708

VL - 2023

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 1

M1 - 160

ER -