New structure around 3250 MeV in the baryonic B decay and the $D^*_0(2400)N$ molecular hadron

TL;DR

This paper proposes that the enhancement structure around 3250 MeV observed in baryonic B decays is due to an isovector $nD^{*}_0(2400)^0$ molecular state, supported by spectral analysis and decay channel consistency.

Contribution

It introduces the isovector $nD^{*}_0(2400)^0$ molecular state as an explanation for the $X_c(3250)^0$ structure, providing spectral and decay analysis evidence.

Findings

The $X_c(3250)^0$ can be explained as an isovector $nD^{*}_0(2400)^0$ molecular state.

The molecular state decays into $ ext{Sigma}_c^{++} ext{pi}^- ext{pi}^-$, matching experimental data.

Spectral analysis supports the molecular state interpretation.

Abstract

In this work, we first propose the isovector $nD^{*}_0(2400)^0$ molecular state to explain the enhancement structure around 3250 MeV ($X_c(3250)^0$) in the $\Sigma_c^{++}\pi^-\pi^-$ invariant mass spectrum newly observed by the BaBar Collaboration. Under this molecular state configuration, both the analysis of the mass spectrum and the study of its dominant decay channel can well depict its resonance parameters measured by BaBar. Our investigation also shows that the isovector $nD^{*}_0(2400)^0$ molecular state can decay into $\Sigma_c^{++}\pi^-\pi^-$, which is consistent with the experimental observation. These studies provide the direct support to the isovector $nD^{*}_0(2400)^0$ molecular state assignment to $X_c(3250)^0$.