Gamma (Z ---> B anti-B): A Signature of Hard Mass Terms for a Heavy Top

Bernabeu, J.; Pich, A.; Santamaria, A.

doi:10.1016/0370-2693(88)90173-6

Gamma (Z ---> B anti-B): A Signature of Hard Mass Terms for a Heavy Top

Oct, 1987

6 pages

Published in:

Phys.Lett.B 200 (1988) 569-574

Published: 1988

DOI:

10.1016/0370-2693(88)90173-6

Report number:

CERN-TH-4878/87

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Abstract: (Elsevier)

We calculate analytically the weak radiative corrections to the weak neutral current gauge boson-bottom fermion vertex, keeping the mass m t of the internal fermion line for the relevant diagrams. We find, to order α, a hard mass-term dependence m t 2 M W 2 of the amplitude, for large m t 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 Z 0 decay width to b-quarks decreases, due to these weak radiative corrections, by 0.6%–2.5% when the top mass m t varies from 45 to 200 GeV.

Z0: NONLEPTONIC DECAY
NONLEPTONIC DECAY: Z0
Z0: WIDTH
BOTTOM
QUARK: PAIR PRODUCTION
PAIR PRODUCTION: QUARK
RADIATIVE CORRECTION
top
QUARK: MASS
MASS: QUARK

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