Correlation function for the $T_{bb}$ state: Determination of the binding, scattering lengths, effective ranges and molecular probabilities

TL;DR

This paper investigates the $T_{bb}$ state by analyzing $B^{*+}B^0$ and $B^{*0}B^+$ correlation functions, determining its binding energy, scattering parameters, and molecular probabilities using an extended hidden gauge approach and bootstrap method.

Contribution

It introduces a method to extract low-energy observables and molecular probabilities of the $T_{bb}$ state from correlation functions with experimental uncertainties.

Findings

Bound state with ~21 MeV binding energy identified.

Scattering lengths and effective ranges determined with acceptable precision.

Source size of the experimental correlation functions can be accurately measured.

Abstract

We perform a study of the $B^{*+}B^0,B^{*0}B^+$ correlation functions using an extension of the local hidden gauge approach which provides the interaction from the exchange of light vector mesons and gives rise to a bound state of these components in $I=0$ with a binding energy of about $21$~MeV. After that, we face the inverse problem of determining the low energy observables, scattering length and effective range for each channel, the possible existence of a bound state, and, if found, the couplings of such a state to each $B^{*+}B^0,B^{*0}B^+$ component as well as the molecular probabilities of each of the channels. We use the bootstrap method to determine these magnitudes and find that, with errors in the correlation function typical of present experiments, we can determine all these magnitudes with acceptable precision. In addition, the size of the source function of the experiment from where the correlation functions are measured can be also determined with a high precision.