Extending the {ital STU} formalism for electroweak oblique corrections to the case of light new physics
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States)
- Theory Group, Department of Physics, University of Texas, Austin, Texas 78712 (United States)
The {ital STU} formalism, which parametrizes oblique electroweak corrections due to heavy new physics, has recently been extended to the case of light new physics. In principle, this extended formalism, which involves the six parameters {ital STUVWX}, must be used if loop contributions to the oblique corrections entail light new particles with masses in the range {approximately}{ital M}{sub {ital Z}} or less. Applying classical equations of motion to manipulate the effective lagrangian, we present here a thorough introductory discussion of the {ital STUVWX} formalism, elucidating such subtleties as the connection between {ital S}{minus}{ital X} and the star formalism of Kennedy and Lynn, the connection between {ital S}{minus}{ital X}, and the {epsilon} parameters of Altarelli and Barbieri, and the loss of definite symmetry properties which {ital S} and {ital U} undergo as the {ital STU} parameter set is extended to the case of light new physics. This paper provides a significantly more detailed, expanded, and pedagogic presentation than previous expositions of the {ital STUVWX} parameters. Copyright {copyright} 1996 Academic Press, Inc.
- OSTI ID:
- 399739
- Journal Information:
- Annals of Physics (New York), Vol. 251, Issue 1; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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