Effects of a $N^*$ resonance with hidden charm in the $\pi^- p \to D^- \Sigma_c^+$ reaction near threshold

Understand

We study the effect of a hidden charm nuclear excited state $N^*_{c\bar{c}}$ in the $\pi^- p \to D^- \Sigma_c^+$ reaction near threshold using an effective Lagrangian approach.

• We calculate the background contribution of the $t$ and $u$ channels by the $D^{*0}$ vector meson exchange and $\Sigma_c^{++}$ intermediate state, respectively.
• We show that the consideration of a $N^*_{c\bar{c}}$ resonance provides an enhancement of the total cross section close to the reaction threshold.
• We also evaluate the differential cross section for different energies and we study the angle dependence.