论文标题
弱辐射衰减$λ_{c}^{+} \toς^{+}γ$使用轻单和规则
Weak radiative decay $Λ_{c}^{+}\toΣ^{+}γ$ using light-cone sum rules
论文作者
论文摘要
我们使用轻锥总规则计算$λ_{c}^{+} \toς^{+}γ$的衰减宽度。对于最初的夸克辐射，建立了有效的哈密顿量，内部夸克线缩小到一个点。在完整的理论中研究了最终的夸克辐射。 $σ^+$的领先扭曲灯锥分布振幅可作为总规则计算的非扰动输入，并且扰动内核是按领先顺序计算的。我们获得的分支分数为$ {\ cal b}（λ_{c}^{+} \toς^{+}γ）= 1.03 \ pm 0.36 \ pm 0.36 \ times 10^{ - 4} $，低于最近的上限$ <2.6 \ 2.6 \ 2.6 \ 2.6 \ 2.6 \ 2.6 \ 2.6 \ 2.6 \ 2.6 \ times 10^{ - 4} $。
We calculate the decay width of the $Λ_{c}^{+}\toΣ^{+}γ$ using light-cone sum rules. For the initial quark radiation an effective Hamiltonian is constructed, where the internal quark line shrinks to a point. The final quark radiation is studied within the full theory. The leading twist light-cone distribution amplitudes of the $Σ^+$ serve as the non-perturbative input for the sum rules calculation, and the perturbative kernel is calculated at leading order. The branching fraction we obtain is ${\cal B}(Λ_{c}^{+}\toΣ^{+}γ)=1.03\pm 0.36 \times 10^{-4}$, which is below the recent upper limit $<2.6 \times 10^{-4}$ given by the Belle collaboration.
