Magnetic moments of the spin-1/2 singly charmed baryons in covariant baryon chiral perturbation theory

Recent experimental advances have reignited theoretical interests in heavy-flavor hadrons. In this work, we study the magnetic moments of the spin-1/2 singly charmed baryons up to the next-to-leading order in covariant baryon chiral perturbation theory (BChPT) with the extended-on-mass-shell renormalization (EOMS) scheme. The pertinent low energy constants (LECs) g1-4 are fixed with the help of the quark model and the heavy quark spin flavor symmetry, while the remaining d2, d3, d5, and d6 are determined by fitting to the lattice QCD pion-mass dependent data. With the LECs so determined, we predict the magnetic moments of the spin-1/2 singly charmed baryons and compare them with those of other approaches, and find that our predictions are in general smaller in absolute values than those of other approaches, which are tied to the lattice QCD data we fitted. More studies are therefore needed to clarify this situation and to better understand the nature of the singly charmed baryons.