Electromagnetic properties of doubly charmed baryons in Lattice QCD

Abstract

We compute the electromagnetic properties of Ξcc baryons in (2+1)-flavor Lattice QCD. By measuring the electric charge and magnetic form factors of Ξcc baryons, we extract the magnetic moments, charge and magnetic radii as well as the ΞccΞccρ coupling constant, which provide important information to understand the size, shape and couplings of the doubly charmed baryons. We find that the two heavy charm quarks drive the charge radii and the magnetic moment of Ξcc to smaller values as compared to those of, e.g., the proton.TÜBİTAK ; KAKENH

Electromagnetic structure of charmed baryons in Lattice QCD

“…We have argued in ref. [5] that such behavior may be related to the modification of the confinement force in the hadrons.…”

“…[4,5] for the details of our lattice setup. We use four sets of configurations with different light quark hopping parameters κ u,d sea = 0.13700, 0.13727, 0.13754, JHEP05(2014)125 Figure 1.…”

“…In order to illustrate how plateau regions change as we approach the chiral limit, we give in figure 5 the electric form factors of Ξ ++ cc and the magnetic form factors of Ξ + cc for all the quark masses we consider. In determining a plateau region, we consider the p-value as a criterion [5,19]. In each case, we search for plateau regions of minimum three time slices between the source and the sink, and we choose the one that has the highest p-value.…”

Electromagnetic structure of charmed baryons in Lattice QCD

“…Our results show that the doubly charged Σ ++ c has the largest electric charge radius amongst the baryons that we considered. The electric charge radii of Ω + cc and Ξ + cc [2] are about the same size which suggests that electric charge radius is insensitive to replacing the light d-quark by an s-quark. We observe that the electric charge radii is much smaller compared to that of the proton (the PDG value is r 2 E,p =0.770 fm 2 [13]).…”

“…The framework of lattice QCD enables us to determine such form factors starting from quark and gluon degrees of freedom. In our previous works we have found that the existence of a charm quark drives the charge radii and magnetic moments of the hadrons to smaller values [1,2]. Yet it is interesting to see how the charge radii are affected as the light quark gets heavier as in the case of replacing the u/d quark by an s quark.…”