We propose a method to evaluate numerically and in some cases analytically the two-loop contributions to physical quantities without computing Feynman graphs. Such contributions are negligible for the SU(2) Wilson action, which shows a precocious scaling; on the contrary they are important for other actions (including Manton and heat kernel ones) and account for the observed violations of universality. © 1982.
Precocious scaling in lattice gauge theories / Gliozzi F.; Ravanini F.; Sciuto S.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 118:4-6(1982), pp. 402-406. [10.1016/0370-2693(82)90212-X]
Precocious scaling in lattice gauge theories
Ravanini F.;
1982
Abstract
We propose a method to evaluate numerically and in some cases analytically the two-loop contributions to physical quantities without computing Feynman graphs. Such contributions are negligible for the SU(2) Wilson action, which shows a precocious scaling; on the contrary they are important for other actions (including Manton and heat kernel ones) and account for the observed violations of universality. © 1982.File in questo prodotto:
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