A novel approach to confront electroweak data and theory

K. Hagiwara, D. Haidt, C. S. Kim, S. Matsumoto

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

A novel approach to study electroweak physics at one-loop level in generic SU(2)L×U(1)Y theories is introduced. It separates the 1-loop corrections into two pieces: process specific ones from vertex and box contributions, and universal ones from contributions to the gauge boson propagators. The latter are parametrized in terms of four effective form factors {Mathematical expression} and {Mathematical expression} corresponding to the γγ, γZ, ZZ and WW propagators. Under the assumption that only the Standard Model contributes to the process specific corrections, the magnitudes of the four form factors are determined at q2=0 and at q2=mZ2 by fitting to all available precision experiments. These values are then compared systematically with predictions of SU(2)L×U(1)Y theories. In all fits αs(mZ) and {Mathematical expression} are treated as external parameters in order to keep the interpretation as flexible as possible. The treatment of the electroweak data is presented in detail together with the relevant theoretical formulae used to interpret the data. No deviation from the Standard Model has been identified. Ranges of the top quark and Higgs boson masses are derived as functions of αs(mZ) and {Mathematical expression}. Also discussed are consequences of the recent precision measurement of the left-right asymmetry at SLC as well as the impact of a top quark mass and an improved W mass measurement.

Original languageEnglish
Pages (from-to)559-620
Number of pages62
JournalZeitschrift für Physik C Particles and Fields
Volume64
Issue number4
DOIs
Publication statusPublished - 1994 Dec 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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