학술논문

Measurement of two-photon decay width of χ c2(1P) in γγ → χ c2(1P) → J/ψγ at Belle
Document Type
article
Author
The Belle collaborationY. SeinoK. HayasakaS. UeharaI. AdachiH. AiharaS. Al SaidD. M. AsnerH. AtmacanT. AushevR. AyadV. BabuS. BahinipatiP. BeheraK. BelousJ. BennettM. BessnerV. BhardwajB. BhuyanT. BilkaD. BodrovG. BonviciniJ. BorahA. BozekM. BračkoP. BranchiniT. E. BrowderA. BudanoM. CampajolaD. ČervenkovM.-C. ChangP. ChangV. ChekelianA. ChenB. G. CheonK. ChilikinH. E. ChoK. ChoS.-J. ChoS.-K. ChoiY. ChoiS. ChoudhuryD. CinabroS. DasG. De PietroR. DhamijaF. Di CapuaJ. DingfelderZ. DoležalT. V. DongD. EpifanovT. FerberD. FerlewiczB. G. FulsomR. GargV. GaurN. GabyshevA. GarmashA. GiriP. GoldenzweigE. GrazianiC. HadjivasiliouH. HayashiiW.-S. HouC.-L. HsuK. InamiN. IpsitaA. IshikawaR. ItohM. IwasakiW. W. JacobsE.-J. JangS. JiaY. JinK. K. JooH. KakunoK. H. KangG. KaryanT. KawasakiC. KieslingC. H. KimD. Y. KimK.-H. KimY.-K. KimP. KodyšT. KonnoA. KorobovS. KorparE. KovalenkoP. KrižanP. KrokovnyM. KumarR. KumarK. KumaraT. LamJ. S. LangeS. C. LeeC. H. LiJ. LiL. K. LiY. LiY. B. LiL. Li GioiJ. LibbyK. LieretM. MasudaT. MatsudaD. MatvienkoS. K. MauryaF. MeierM. MerolaK. MiyabayashiH. MiyataR. MizukG. B. MohantyM. MrvarR. MussaM. NakaoZ. NatkaniecA. NatochiiL. NayakM. NayakM. NiiyamaN. K. NisarS. NishidaS. OgawaH. OnoY. OnukiP. OskinP. PakhlovG. PakhlovaS. PardiH. ParkS.-H. ParkS. PatraS. PaulT. K. PedlarR. PestotnikL. E. PiilonenT. PodobnikE. PrencipeM. T. PrimN. RoutG. RussoS. SandilyaA. SangalL. SanteljT. SanukiV. SavinovG. SchnellJ. SchuelerC. SchwandaK. SenyoM. E. SeviorM. ShapkinC. SharmaC. P. ShenJ.-G. ShiuJ. B. SinghA. SokolovE. SolovievaM. StaričZ. S. StottlerJ. F. StrubeM. SumihamaK. SumisawaT. SumiyoshiM. TakizawaU. TamponiK. TanidaF. TenchiniM. UchidaT. UglovY. UnnoK. UnoS. UnoR. van TonderG. VarnerA. VinokurovaE. WaheedE. WangM.-Z. WangX. L. WangM. WatanabeS. WatanukiE. WonB. D. YabsleyW. YanS. B. YangJ. H. YinC. Z. YuanY. YusaY. ZhaiZ. P. ZhangV. ZhilichV. ZhukovaV. Zhulanov
Source
Journal of High Energy Physics, Vol 2023, Iss 1, Pp 1-20 (2023)
Subject
e +-e − Experiments
Quarkonium
Nuclear and particle physics. Atomic energy. Radioactivity
QC770-798
Language
English
ISSN
1029-8479
Abstract
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 Γ γγ χ c 2 1 P B χ c 2 1 P → J / ψγ B J / ψ → ℓ + ℓ − = 14.8 ± 0.3 stat . ± 0.7 syst . $$ {\Gamma}_{\gamma \gamma}\left({\chi}_{c2}(1P)\right)\mathcal{B}\left({\chi}_{c2}(1P)\to J/\psi \gamma \right)\mathcal{B}\left(J/\psi \to {\ell}^{+}{\ell}^{-}\right)=14.8\pm 0.3\left(\textrm{stat}.\right)\pm 0.7\left(\textrm{syst}.\right) $$ 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 $$ \mathcal{B} $$ (χ c2(1P) → J/ψγ) and B $$ \mathcal{B} $$ (J/ψ → ℓ + ℓ − ).