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A Global analysis of the top quark couplings to gauge bosons

Ehab Malkawi
(
- Michigan State U.
)
,
C.P. Yuan
(
- Michigan State U.
)

May, 1994

52 pages

Published in:

Phys.Rev.D 50 (1994) 4462-4477

e-Print:

hep-ph/9405322 [hep-ph]

DOI:

10.1103/PhysRevD.50.4462

Report number:

MSUHEP-94-06

View in:

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Abstract:

We propose to probe the electroweak symmetry breaking sector by measuring the effective couplings of the top quark to gauge bosons. Using precision LEP data, we constrain the non--universal couplings of t-t-Z and t-b-W, parameterized by

\kappa_{L}~{NC}

,

\kappa_{R}~{NC}

,

\kappa_{L}~{CC}

and

\kappa_{R}~{CC}

, in the electroweak chiral lagrangian framework. Different scenarios of electroweak symmetry breaking will imply different correlations among these parameters. We found that at the order of

{m_t}~{2}\log {\Lambda}~2

, in which

\Lambda \sim 4 \pi v

is the cut--off scale of the effective theory,

\kappa_{L}~{NC}

is already constrained by LEP data. In models with an approximate custodial symmetry, a positive

\kappa_{L}~{CC}

is preferred.

\kappa_{L}~{CC}

can be constrained by studying the direct detection of the top quark at the Tevatron and the LHC. At the NLC,

\kappa_{L}~{NC}

and

\kappa_{R}~{NC}

can be better measured.

electroweak interaction: symmetry breaking
symmetry breaking: electroweak interaction
top
bottom
coupling: (gauge boson 2quark)
(gauge boson 2quark): coupling
mass: top
top: mass
effective Lagrangian: chiral
Higgs particle: mass

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