Can light Nambu-Goldstone boson loops counter the {open_quote}{open_quote}{ital S} argument{close_quote}{close_quote} against technicolor?

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.2781· OSTI ID:279193

Fleming, S ^[1]; Maksymyk, I ^[2]

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1. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States)
2. Theory Group, Department of Physics, University of Texas, Austin, Texas 78712 (United States)

We examine the oblique correction phenomenology of one-family technicolor with light pseudo Goldstone bosons. From loop calculations based on a gauged chiral Lagrangian for technicolor we are led to conclude that even though loops with light Goldstone bosons give a negative contribution to {ital S} measured at the {ital Z} pole, this effect is not sufficiently large to unambiguously counter the {open_quote}{open_quote}{ital S} argument{close_quote}{close_quote} against one-family technicolor. This result cannot be guessed {ital a} {ital priori}, but must be explicitly calculated. Our analysis entails an extended version of the {ital STU} oblique parametrization of Peskin and Takeuchi. In principle, this extended formalism ({ital STUVWX}) must be used when there are light new particles in loops. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Northwestern University
• DOE Contract Number: FG02-91ER40684
• OSTI ID: 279193
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 53; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
COLOR MODEL
CORRECTIONS
GOLDSTONE BOSONS
LAGRANGIAN FUNCTION
LOOPS
QUANTUM CHROMODYNAMICS
SCALING
SYMMETRY BREAKING