6533b86ffe1ef96bd12cd47e
RESEARCH PRODUCT
Longitudinal, transverse-plus and transverse-minus W-bosons in unpolarized top quark decays at O(alpha_s)
J. G. KörnerM. C. MauserStefan GrooteM. Fischersubject
PhysicsNuclear and High Energy PhysicsTop quarkParticle physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyFOS: Physical sciencesHelicityBottom quarkTransverse planeHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Content (measure theory)Radiative transferHigh Energy Physics::ExperimentBorn approximationBosondescription
We consider the O(alpha_s) radiative corrections to the decay of an unpolarized top quark into a bottom quark and a W-gauge boson where the helicities of the W are specified as longitudinal, transverse-plus and transverse-minus. The O(alpha_s) radiative corrections lower the normalized longitudinal rate Gamma_L/Gamma by 1.06% and increase the the normalized transverse-minus rate Gamma_-/Gamma by 2.17%. We find that the normalized transverse-plus rate Gamma_+/Gamma, which vanishes at the Born term level for m_b->0, receives radiative correction contributions at the sub-percent level. We discuss m_b!=0 effects for the Born term and the alpha_s-contributions but find these to be small. Our results are discussed in the light of recent measurements of the helicity content of the W in top quark decays by the CDF Collaboration.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-11-06 |