The quest for topped hadrons

Abstract: Inspired by the recent discovery of an pseudoscalar enhancement structure near the $t\bar{t}$ threshold reported by the CMS and ATLAS collaborations, this work investigates the mass spectra of single topped hadrons-including both topped mesons and topped baryons-based on a relativistic potential model. Our results show that, using the same parameters obtained from the fit to mesons and baryons, the calculated mass of pseudoscalar topponium is in excellent agreement with the observed enhancement structure, demonstrating the consistency and unifying power of the model. Accordingly, we provide predictions for the mass spectra of ground and low-lying orbitally excited single topped mesons and baryons, which may serve as a reference for future experimental searches for these possible new hadronic matter.