6533b836fe1ef96bd12a0962
RESEARCH PRODUCT
Limits on Anomalous Top Couplings from Z Pole Physics
Oscar J.p. EboliSergio F NovaesM. C. Gonzalez-garciasubject
PhysicsNuclear and High Energy PhysicsTop quarkParticle physicsElectroweak interactionHigh Energy Physics::PhenomenologyFOS: Physical sciencesObservableCustodial symmetryHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Dimension (vector space)Bounded functionBosondescription
We obtain constraints on possible anomalous interactions of the top quark with the electroweak vector bosons arising from the precision measurements at the Z pole. In the framework of $SU(2)_L \otimes U(1)_Y$ chiral Lagrangians, we examine all effective CP-conserving operators of dimension five which induce fermionic currents involving the top quark. We constrain the magnitudes of these anomalous interactions by evaluating their one-loop contributions to the Z pole physics. Our analysis shows that the operators that contribute to the LEP observables get bounds close to the theoretical expectation for their anomalous couplings. We also show that those which break the $SU(2)_C$ custodial symmetry are more strongly bounded.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-04-24 |