论文标题
$γγ\ rightarrowχ_{C2}（1p）（1p）\ rightarrow J/ψγ$在$γγ\ rightArrowχ_χ_in $γγ\ in $γγ\ in $γγ\ in $γγ\ in $γγ\ in Belle的测量$χ_{C2}（1p）$的测量
Measurement of two-photon decay width of $χ_{c2}(1P)$ in $ γγ\rightarrow χ_{c2}(1P) \rightarrow J/ψγ$ at Belle
论文作者
论文摘要
我们在Belle实验的两光量过程中报告了两光子衰减宽度的测量值$χ_{C2}（1p）$。我们分析过程$γγ\rightarrowχ_{C2}（1p）\ rightArrow j/ψγ$，$ j/ψ\ rightArrow \ eligharrow \ ell^{+el^{+ell^\ ell^{ - } $（\ ell = e \ ell = e \ e \ e \ e \ e \ rm或}检测器在kekb $ e^{+} e^{ - } $ collider。在此分析中，两光子衰减宽度的$χ_{C2}（1p）$的产物确定为$γ_{γγ}（χ_{C2}（1p）（1p）） γ）\ Mathcal {b}（J/ψ\ rightArrow \ ell^+\ ell^ - ）= {\ rm 14.8} $ $ $ \ pm $ $ $ $ $ {\ rm 0.3}（{\ rm Stat。}） γ_{γγ}（χ_{c2}（1p））$ = 653 $ \ pm $ 13（stat。）$ \ pm $ 31（syst。）$ \ pm $ \ pm $ 17（b.r。）ev，第三个不确定性是$ \ \ \ \ \ \ \ \ \ \ \ natcal {b}（b}（χ_{χ2} $ {c2}（c2}（c2}（1p）） $ \ mathcal {b}（j/ψ\ rightarrow \ ell^+\ ell^ - ）$。
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\rightarrow χ_{c2}(1P) \rightarrow J/ψγ$, $J/ψ\rightarrow \ell^{+} \ell^{-}$ $(\ell = e \ {\rm or} \ μ)$ 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 $Γ_{γγ}(χ_{c2}(1P)) \mathcal{B}( χ_{c2}(1P) \rightarrow J/ψ\, γ)\mathcal{B}( J/ψ\rightarrow \ell^+\ell^- ) = {\rm 14.8}$ $\pm$ ${\rm 0.3}({\rm stat.})$ $\pm$ ${\rm 0.7}({\rm syst.})$ eV, which corresponds to $ Γ_{γγ}(χ_{c2}(1P)) $ = 653 $\pm$ 13(stat.) $\pm$ 31(syst.) $\pm$ 17(B.R.) eV, where the third uncertainty is from $\mathcal{B}( χ_{c2}(1P) \rightarrow J/ψ\, γ)$ and $\mathcal{B}( J/ψ\rightarrow \ell^+\ell^- )$.
