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We derive an explicit analytical expression for the magnetic dipole moment ofthe rho meson, mu_rho, in a relativistic constituent-quark model. We adopt ourrelativistic approach to composite systems, modified instant-form (mIF)Relativistic Quantum Mechanics (RQM), that we used particularly to construct aunified pi&rho model (Phys. Rev. D93, 036007 (2016) = arXiv:1602.00907)describing electroweak properties of light mesons. This model provides aparameter-free calculation to give mu_rho=(2.16+-0.03) [e/2M_rho] which is inaccordance with the conventional experimental data. The magnetic, quadrupoleand charge form factors also are derived and presented. We consider the smalluncertainty of our value of magnetic moment as one of undoubted advantages ofthe method. A comparison is made with recent lattice QCD results and previouscalculations using a variety of methods.

Magnetic moment of the rho meson in instant-form relativistic quantum mechanics