Current quark mass dependence of nucleon magnetic moments and radii
نویسندگان
چکیده
A calculation of the current-quark-mass-dependence of nucleon static electromagnetic properties is necessary in order to use observational data as a means to place constraints on the variation of Nature’s fundamental parameters. A Poincaré covariant Faddeev equation, which describes baryons as composites of confined-quarks and -nonpointlike-diquarks, is used to calculate this dependence. The results indicate that, like observables dependent on the nucleons’ magnetic moments, quantities sensitive to their magnetic and charge radii, such as the energy levels and transition frequencies in Hydrogen and Deuterium, might also provide a tool with which to place limits on the allowed variation in Nature’s constants.
منابع مشابه
Hyperon electromagnetic properties in two-flavor chiral perturbation theory
properties in two-flavor chiral perturbation theory. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. The pion-mass dependence of hyperon electromagnetic properties...
متن کاملStrange nucleon form factors in the perturbative chiral quark model
We apply the perturbative chiral quark model at one loop to calculate the strange form factors of the nucleon. A detailed numerical analysis of the strange magnetic moments and radii of the nucleon, and also the momentum dependence of the form factors is presented. PACS: 12.39.Fe, 12.39.Ki, 13.40.Gp, 14.20.Dh
متن کاملBaryon form factors in a diquark–quark bound state description
Nucleon form factors are calculated in a relativistic diquark–quark picture based on the Nambu–Jona-Lasinio model. The nucleon wave function is obtained in a static approximation to the quark exchange interaction between the valence quark and the diquark. We evaluate the valence quark and 0–diquark contribution to the nucleon electromagnetic and weak currents. We find reasonable electric charge...
متن کاملNucleon Form Factors in a Relativistic Three-quark Model
We report the calculation of electromagnetic form factors of nucleons within a relativistic three-quark model with Gaussian shape for the nucleon-quark vertex. The allowed region for two adjustable parameters, the range parameter ΛN in the Gaussian and the constituent quark mass mq, is obtained from fitting the data for magnetic moments and electromagnetic radii of nucleons. It is found that th...
متن کاملNucleon structure with dynamical (2+1)-flavor domain wall fermions lattice QCD
We report isovector form factors and low moments of isovector structure functions of nucleon from the coarse RIKEN-BNL-Columbia (RBC) and UKQCD joint dynamical (2+1)-flavor domain-wall fermions (DWF) ensembles. The lattice cut off is estimated at a−1 = 1.7 GeV. The lattice volume is as large as 2.7 fm across. The dynamical strange mass is set at slightly heavier than physical, and degenerate up...
متن کامل