Discriminating among interpretations for the $X(2900)$ states

TL;DR

This paper compares various theoretical models for the $X(2900)$ states, predicting their production and decay patterns in B meson decays to help experimental data distinguish among interpretations like molecules, tetraquarks, or kinematic effects.

Contribution

It provides detailed predictions for $X(2900)$ states under multiple models, highlighting observable differences to guide future experimental discrimination.

Findings

Distinct decay and production signatures for each model

Predictions for charged partners of $X(2900)$

Guidelines for experimental tests to identify the true nature

Abstract

We make predictions for the production and decays of $X(2900)$ states, and their possible charged partners, in $B^+$ and $B^0$ decays, considering a number of competing models for the states, including triangle diagrams mediated by quark exchange or pion exchange, and resonance scenarios including molecules and tetraquarks. Assuming only isospin symmetry and the dominance of colour-favoured weak decays, we find characteristic differences in the predictions of the different models. Future experimental studies can therefore discriminate among the competing interpretations for the states.