Observation of the Charmonium Decay η c → γ γ in J / ψ → γ η c

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doi:10.1103/PhysRevLett.134.181901

Observation of the Charmonium Decay $η_{c} \to γ γ$ in $J / ψ \to γ η_{c}$

Journal Article · Mon May 05 00:00:00 EDT 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.134.181901· OSTI ID:2564519

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A. more »

Using $(2712.4 \pm 14.3) \times 10^{6} ψ (3686)$ events collected with the BESIII detector at the BEPCII collider, the decay $η_{c} \to γ γ$ in $J / ψ \to γ η_{c}$ is observed. We determine the product branching fraction $B (J / ψ \to γ η_{c}) \times B (η_{c} \to γ γ) = (5.23 \pm 0.2 6_{stat} \pm 0.3 0_{syst}) \times 10^{- 6}$ . This result is consistent with the lattice QCD calculation $(5.34 \pm 0.16) \times 10^{- 6}$ from HPQCD in 2023. By using the world-average values of $B (J / ψ \to γ η_{c})$ and the total decay width of $η_{c}$ , the partial decay width $Γ (η_{c} \to γ γ)$ is determined to be $(11.30 \pm 0.5 6_{stat} \pm 0.6 6_{syst} \pm 1.1 4_{ref}) keV$ , which deviates from the corresponding world-average value by $3.4 σ$ .

Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2564519

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 134; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Precision tests of the J / ψ from full lattice QCD: Mass, leptonic width, and radiative decay rate to η c Donald, G. C.; Davies, C. T. H.; Dowdall, R. J. Physical Review D, Vol. 86, Issue 9 https://doi.org/10.1103/PhysRevD.86.094501	journal	November 2012
Evidence forηc→γγand measurement ofJ/ψ→3γ Ablikim, M.; Achasov, M. N.; Ambrose, D. J. Physical Review D, Vol. 87, Issue 3 https://doi.org/10.1103/PhysRevD.87.032003	journal	February 2013
Two-photon transition form factor of c ¯ c quarkonia Chen, Jing; Ding, Minghui; Chang, Lei Physical Review D, Vol. 95, Issue 1 https://doi.org/10.1103/PhysRevD.95.016010	journal	January 2017
Measurement of η c ( 1 S ) , η c ( 2 S ) , and nonresonant η ′ π + π − production via two-photon collisions Xu, Q. N.; Adachi, I.; Aihara, H. Physical Review D, Vol. 98, Issue 7 https://doi.org/10.1103/PhysRevD.98.072001	journal	October 2018
Inclusive decays of ηc and ηb at NNLO with large nf resummation Brambilla, Nora; Chung, Hee Sok; Komijani, Javad Physical Review D, Vol. 98, Issue 11 https://doi.org/10.1103/PhysRevD.98.114020	journal	December 2018
Observation of J / ψ → 3 γ Adams, G. S.; Anderson, M.; Cummings, J. P. Physical Review Letters, Vol. 101, Issue 10 https://doi.org/10.1103/PhysRevLett.101.101801	journal	September 2008
J / ψ and ψ ( 2 S ) Radiative Transitions to η c Mitchell, R. E.; Shepherd, M. R.; Besson, D. Physical Review Letters, Vol. 102, Issue 1 https://doi.org/10.1103/PhysRevLett.102.011801	journal	January 2009
Erratum: J / ψ and ψ ( 2 S ) Radiative Transitions to η c [Phys. Rev. Lett. 102 , 011801 (2009)] Mitchell, R. E.; Shepherd, M. R.; Besson, D. Physical Review Letters, Vol. 106, Issue 15 https://doi.org/10.1103/PhysRevLett.106.159903	journal	April 2011
Measurements of the Mass and Width of the η c Using the Decay ψ ( 3686 ) → γ η c Ablikim, M.; Achasov, M. N.; Alberto, D. Physical Review Letters, Vol. 108, Issue 22 https://doi.org/10.1103/PhysRevLett.108.222002	journal	May 2012
Observation of New Resonant Structures in γ γ → ω ϕ , ϕ ϕ , and ω ω Liu, Z. Q.; Shen, C. P.; Yuan, C. Z. Physical Review Letters, Vol. 108, Issue 23 https://doi.org/10.1103/PhysRevLett.108.232001	journal	June 2012
Next-to-Next-to-Leading-Order QCD Corrections to the Hadronic Width of Pseudoscalar Quarkonium Feng, Feng; Jia, Yu; Sang, Wen-Long Physical Review Letters, Vol. 119, Issue 25 https://doi.org/10.1103/PhysRevLett.119.252001	journal	December 2017
Two-Photon Decays of Charmonia from Lattice QCD Dudek, Jozef J.; Edwards, Robert G. Physical Review Letters, Vol. 97, Issue 17 https://doi.org/10.1103/PhysRevLett.97.172001	journal	October 2006
Study of charmonia in four-meson final states produced in two-photon collisions Uehara, S.; Adachi, I.; Aihara, H. The European Physical Journal C, Vol. 53, Issue 1 https://doi.org/10.1140/epjc/s10052-007-0451-z	journal	November 2007
Heavy quarkonium: progress, puzzles, and opportunities Brambilla, N.; Eidelman, S.; Heltsley, B. K. The European Physical Journal C, Vol. 71, Issue 2 https://doi.org/10.1140/epjc/s10052-010-1534-9	journal	February 2011
Two-photon decays of $$\eta _c$$ η c from lattice QCD Chen, Ting; Chen, Ying; Gong, Ming The European Physical Journal C, Vol. 76, Issue 7 https://doi.org/10.1140/epjc/s10052-016-4212-8	journal	June 2016
The heavy quarkonium inclusive decays using the principle of maximum conformality Yu, Qing; Wu, Xing-Gang; Zeng, Jun The European Physical Journal C, Vol. 80, Issue 5 https://doi.org/10.1140/epjc/s10052-020-7967-x	journal	May 2020

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Observation of the Charmonium Decay $η_{c} \to γ γ$ in $J / ψ \to γ η_{c}$