caa a22 4500 469034939 CHVBK 20180323132753.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF01016396 doi (NATIONALLICENCE)springer-10.1007/BF01016396 Shirkov D. aut Mass and scheme effects in coupling constant evolution [Elektronische Daten] [D. Shirkov] We consider two theoretical aspects of coupling constant evolution: the details of effective coupling behavior in the threshold vicinity and the scheme dependence of the Grand Unification description. Our discussion is based on the Bogoliubov renorm-group formulation and particularly on a new analytic solution of a system of mass-dependent two-loop RG evolution equations for three effective couplings of the standard model. Accurate analysis of the threshold singularity reveals the effect connected with kinematic details of heavy particle creation resulting in an effective shift of the threshold mass M→M*. On the other hand, we demonstrate that the threshold crossing generally changes the subtraction scheme. This means that the appropriate choice of a subtraction scheme is important in discussing the unification criterion. Plenum Publishing Corporation, 1993 Theoretical and Mathematical Physics Kluwer Academic Publishers-Plenum Publishers 93/3(1992-12-01), 1403-1408 0040-5779 93:3<1403 1992 93 11232 https://doi.org/10.1007/BF01016396 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01016396 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Shirkov D. aut NATIONALLICENCE 773 0- Theoretical and Mathematical Physics Kluwer Academic Publishers-Plenum Publishers 93/3(1992-12-01), 1403-1408 0040-5779 93:3<1403 1992 93 11232 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer