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Measurement of two-photon decay width of $$chi_{c2}(1P)$$ in $$ gamma gamma rightarrow chi_{c2}(1P) rightarrow J/psigamma$$ at Belle

Seino, Yoshiaki*; Tanida, Kiyoshi   ; Belle Collaboration*; 194 of others*

We report the measurement of the two-photon decay width of $$chi_{c2}(1P)$$ in two-photon processes at the Belle experiment. We analyze the process $$ gamma gamma rightarrow chi_{c2}(1P) rightarrow J/psigamma$$, $$J/psi rightarrow ell^{+} ell^{-}$$ $$(ell = e {rm or} mu)$$ 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 $$chi_{c2}(1P)$$ and the branching fraction is determined to be $$Gamma_{gamma gamma}(chi_{c2}(1P)) mathcal{B}( chi_{c2}(1P) rightarrow J/psi , gamma )mathcal{B}(J/psi rightarrow ell^+ell^-) = {rm 14.8}$$ $$pm$$ $${rm 0.3}({rm stat.})$$ $$pm$$ $${rm 0.7}({rm syst.})$$ eV, which corresponds to $$ Gamma_{gamma gamma}(chi_{c2}(1P)) $$ = 653 $$pm$$ 13(stat.) $$pm$$ 31(syst.) $$pm$$ 17(B.R.) eV, where the third uncertainty is from $$mathcal{B}(chi_{c2}(1P) rightarrow J/psi , gamma)$$ and $$mathcal{B}(J/psi rightarrow ell^+ell^-)$$.

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English

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Journal of High Energy Physics (Internet)

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2023

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1

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p.160_1 - 160_18

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2023/01

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Paper URL

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https://doi.org/10.1007/JHEP01(2023)160

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Category:Physics, Particles & Fields

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