# Phenomenological predictions for pentaquark masses from fits to baryon masses

## TL;DR

This paper extends a phenomenological mass formula to predict pentaquark masses, fitting known baryon data and successfully estimating masses close to experimental values for observed pentaquarks.

## Contribution

The work introduces an extended mass model incorporating charm and bottom quarks to predict pentaquark masses, validated by fitting baryon data.

## Key findings

- Model fits well to baryon masses
- Predicted pentaquark masses align with experimental data
- Future predictions may guide experimental searches

## Abstract

We investigate the mass spectra of exotic hadrons known as pentaquarks. We extend a simple phenomenological model based on the G\"ursey-Radicati mass formula for hadrons to include both charmed and bottom baryons as well as to be able to predict masses of pentaquark states including both charm and bottom quark-antiquark pairs. In particular, we perform numerical fits of this model, which includes seven free parameters, to masses of 21 baryons. We find that the model can be well fitted to the experimental values of the baryon masses and observe that the predicted value of about 4400 MeV for the mass of the pentaquark $P_c(4380)^+$ lies within the experimental range reported by the LHCb experiment. In addition, the predicted value of about 4500 MeV for the mass of the pentaquark $P_c(4450)^+$ is close to the experimental value. Finally, in the future, other predicted values for masses of additional pentaquarks could be shown to agree with upcoming experimental results.