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[en] In the framework of a relativistic quasipotential quark model the authors calculate the widths of radiative E1 decays of charmonium and bottomonium with relativistic effects of order υ2/c2 taken into account. They establish that the form of the relativistic corrections is determined by the Lorentz structure of the potential of the interaction of a quark and an antiquark. They achieve the best agreement with the existing experimental data for a mixture of a vector and a scalar potential
Journal
Soviet Journal of Nuclear Physics (English Translation); ISSN 0038-5506; 
; CODEN SJNCA; v. 51(4); p. 705-710
; CODEN SJNCA; v. 51(4); p. 705-710