EXTENDING THE STU FORMALISM FOR ELECTROWEAK OBLIQUE CORRECTIONS TO THE CASE OF LIGHT NEW PHYSICS

Citation
S. Fleming et I. Maksymyk, EXTENDING THE STU FORMALISM FOR ELECTROWEAK OBLIQUE CORRECTIONS TO THE CASE OF LIGHT NEW PHYSICS, Annals of physics, 251(1), 1996, pp. 26-44
Citations number
15
Categorie Soggetti
Physics
Journal title
ISSN journal
00034916
Volume
251
Issue
1
Year of publication
1996
Pages
26 - 44
Database
ISI
SICI code
0003-4916(1996)251:1<26:ETSFFE>2.0.ZU;2-3
Abstract
The STU formalism, which parametrizes oblique electroweak corrections due to heavy new physics, has recently been extended to the case of li ght new physics. In principle, this extended formalism, which involves the six parameters STUVWX, must be used if loop contributions to the oblique corrections entail light new particles with masses in the rang e similar to M(Z) or less. Applying classical equations of motion to m anipulate the effective lagrangian, we present here a thorough introdu ctory discussion of the STUVWX formalism, elucidating such subtleties as the connection between S - X and the star formalism of Kennedy and Lynn, the connection between S - X, and the epsilon parameters of Alta relli and Barbieri, and the loss of definite symmetry properties which S and U undergo as the STU parameter set is extended to the case of l ight new physics. This paper provides a significantly more detailed, e xpanded, and pedagogic presentation than previous expositions of the S TUVWX parameters. (C) 1996 Academic Press, Inc.