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arXiv 1509.02602hep-ph
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中子光生$Λ_{c}^{+}(2940)$

$Λ_{c}^{+}(2940)$ photoproduction off the neutron

Xiao-Yun Wang, Alexey Guskov, Xu-Rong Chen

备注：
7 pages, 5 figures
发表信息：
Phys. Rev. D 92, 094032 (2015)
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摘要：

在假定$Λ_{c}^{\ast }(2940)$是具有自旋宇称$J^{P}=\frac{1}{2}^{+}$和$J^{P}=\frac{1}{2}^{-}$的$pD^{\ast 0}$分子态的基础上，用有效拉格朗日方法研究了$γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$过程中粲$Λ_{c}^{\ast }(2940)$重子的光生.结果表明，在阈值附近，具有$D^{\ast }$交换的$t$ -通道的贡献占主导地位，而具有核子极交换的$s$ -通道的贡献较大.来自$u$通道和接触项的贡献非常小。计算了$γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$反应的总截面，表明在COMPASS实验中寻找粲$Λ_{c}^{\ast }(2940)$重子是可行的.

英文摘要：

By assuming that the $Λ_{c}^{\ast }(2940)$ is a $pD^{\ast 0}$ molecular state with spin-parity $J^{P}=\frac{1}{2}^{+}$ and $J^{P}=\frac{1}{2}^{-}$, the photoproduction of charmed $Λ_{c}^{\ast }(2940)$ baryon in the $γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$ process is investigated with an effective Lagrangian approach. It is found that the contributions from $t$-channel with $D^{\ast }$ exchange are dominant, while the $s$-channel with nucleon pole exchange give a sizeable contribution around the threshold. The contributions from the $u$-channel and contact term are very small. The total cross section of the $γn\rightarrow D^{-}Λ_{c}^{\ast }(2940)^{+}$ reaction is estimated, which indicate it is feasible to searching for the charmed $Λ_{c}^{\ast }(2940)$ baryon at the COMPASS experiment.

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