Two loop heavy top corrections to the rho parameter: A Simple formula valid for arbitrary Higgs mass

Fleischer, J.; Tarasov, O.V.; Jegerlehner, F.

doi:10.1016/0370-2693(93)90810-5

Two loop heavy top corrections to the rho parameter: A Simple formula valid for arbitrary Higgs mass

Jun, 1993

11 pages

Published in:

Phys.Lett.B 319 (1993) 249-256

DOI:

10.1016/0370-2693(93)90810-5

Report number:

BI-TP-93-24,
PSI-PR-93-14

View in:

ADS Abstract Service

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Abstract: (Elsevier)

We present a compact analytic result for the two-loop leading heavy top contribution to the p -parameter which is valid for arbitrary Higgs mass. Our results confirm a recent calculation by Barbieri et al. [Phys. Lett. B 288 (1992) 95; preprint CERN-TH.6713/92 (1992)]. We directly calculate the physical W and Z amplitudes and explicitly check the validity of the Ward identities on which the calculation of Barbieri et al. was based. This also checks that the use of an anticommuting γ 5 preserves the Ward identities. A corresponding formula for the Z b ̄ b -vertex is given as well.

Z0: nonleptonic decay
nonleptonic decay: Z0
bottom
quark: pair production
pair production: quark
effect: top
mass: top
top: mass
electroweak interaction: rho parameter
rho parameter: electroweak interaction

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