Roles of $\bar{D}^{*}K^{*}$ and $D^*\bar{D}$ molecular states in decay $B^+ \to D^{*+} D^- K^+$

TL;DR

This paper explores the molecular state nature of certain exotic hadrons in the decay $B^+ o D^{*+} D^- K^+$, using effective Lagrangians and Bethe-Salpeter equations to analyze invariant mass spectra and identify molecular state contributions.

Contribution

It provides a detailed theoretical analysis of $ar{D}^{*}K^{*}$ and $D^*ar{D}$ molecular states in a specific decay, offering insights into their roles and supporting the molecular interpretation of $T^*_{ar{c}ar{s}0}(2870)^0$.

Findings

Strong support for $T^*_{ar{c}ar{s}0}(2870)^0$ as a $ar{D}^{*}K^{*}$ molecular state.

No significant effect of $D^*ar{D}$ molecular state on the invariant mass spectra.

The $ar{D}^{*}K^{*}$ molecular state explains the enhancement near 2900 MeV in the $D^-K^+$ spectrum.

Abstract

This study investigates the three-body decay process $B^+ \to D^{*+} D^- K^+$, aiming to explore the possible origins of $T^*_{\bar{c}\bar{s}0}(2870)^0$ and $\chi_{c1}(3872)$ as intermediate states. Within the molecular state framework, $T^*_{\bar{c}\bar{s}0}(2870)^0$ and $\chi_{c1}(3872)$ are considered as possible $\bar{D}^{*}K^{}$ and $D^*\bar{D}$ molecular states, respectively. Using effective Lagrangians, the interaction kernels of the $\bar{D}^{*}K^{*}$ and $D^*\bar{D}$ systems are constructed within the one-boson-exchange model. The corresponding rescattering amplitudes and pole positions are obtained by solving the quasipotential Bethe-Salpeter equation. These amplitudes are incorporated into the decay amplitude of the three-body process, and the $D^-K^+$ and $D^{*+}D^-$ invariant mass spectra are simulated via Monte Carlo methods. To better reproduce the experimental data, additional Breit-Wigner contributions from $T^*_{\bar{c}\bar{s}1}(2900)^0$, $\chi_{c1}(4010)$, and $h_c(4300)$ are included. The results show a pronounced enhancement near 2900 MeV in the $D^-K^+$ invariant mass spectrum, strongly supporting the interpretation of $T^*_{\bar{c}\bar{s}0}(2870)^0$ as a $\bar{D}^{*}K^{*}$ molecular state. While the $\bar{D}^{*}K^{*}$ molecular state provides a reasonable contribution to the $D^-K^+$ spectrum, the $D^*\bar{D}$ molecular state yields no significant effect on either the $D^-K^+$ or $D^{*+}D^-$ distributions. This suggests that the observed $\chi_{c1}(3872)$ structure around 3872 MeV may not be interpreted as a $D^*\bar{D}$ molecular state.