Gamma(Z --> bb): A signature of hard mass terms for a heavy top
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Gamma(Z --> bb): A signature of hard mass terms for a heavy top

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Gamma(Z --> bb): A signature of hard mass terms for a heavy top

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Bernabeu Alberola, José Perfil; Pich Zardoya, Antonio Perfil; Santamaria, Arcadi Perfil
This document is a artículoDate1988

Este documento está disponible también en : http://hdl.handle.net/10550/39732
We calculate analytically the weak radiative corrections to the weak neutral current gauge boson-bottom fermion vertex, keeping the mass mt of the internal fermion line for the relevant diagrams. We find, to order alpha, a hard mass-term dependence mt2/MW2 of the amplitude, for large mt values. Its origin comes from the unphysical charged Higgs coupling to fermions in the renormalizable gauge or, equivalently, from the longitudinal charged gauge boson couplings. The diagonal Z0 decay width to b-quarks decreases, due to these weak radiative corrections, by 0.6%-2.5% when the top mass mt varies from 45 to 200 GeV.

    Bernabeu Alberola, José; Pich Zardoya, Antonio; Santamaria Luna, Arcadi (1988) Gamma(Z --> bb): A signature of hard mass terms for a heavy top Physics Letters B 200 4 569 574
http://dx.doi.org/10.1016/0370-2693(88)90173-6

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