Ξcγ → Ξ'c transition in lattice QCD

Abstract

We evaluate the electromagnetic Xi(c)gamma -> Xi'(c) transition on 2+1 flavor lattices corresponding to a pion mass of similar to 156 MeV. We extract the magnetic Sachs and Pauli form factors which give the Xi(c)-Xi'(c) transition magnetic moment and the decay widths of Xi'(c) baryons. We did not find a signal for the magnetic form factor of the neutral transition Xi(0)(c)gamma -> Xi'(0)(c), which is suppressed by the U-spin flavor symmetry. As a byproduct, we extract the magnetic form factors and the magnetic moments of Xi(c) and Xi'(c) baryons, which give an insight to the dynamics of u/d, s and c quarks having masses at different scales. (C) 2017 The Authors. Published by Elsevier B.V.