Fermion Virtual Effects in $e^+ e^- -> W^+ W^-$ Cross Section

Details Fermion Virtual Effects in $e^+ e^- -> W^+ W^-$ Cross Section Fermion Virtual Effects in $e^+ e^- -> W^+ W^-$ Cross Section

1996-05-28

arxiv.org/abs/hep-ph/9605415v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

uuencoded, gz-compressed, tar-ed file. 8 pages, 4 EPS figures, uses EPSFIG.STY

Scientific paper

We analyse the contribution of new heavy virtual fermions to the $e^+e^- \rightarrow W^+W^-$ cross section. We find that there exists a relevant interplay between trilinear and bilinear oblique corrections. The result strongly depends on the chiral or vector--like nature of the new fermions. As for the chiral case we consider sequential fermions: one obtains substantial deviation from the Standard model prediction, making the effect possibly detectable at $\sqrt{s}=500$ or $1000$ GeV linear colliders. As an example for the vector--like case we take a SUSY extension with heavy charginos and neutralinos: due to cancellation, the final effect turns out to be negligible.

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