Second order QCD corrections toΓ(t→Wb)

Second-order Approximate Corrections for QCD Processes

Second Order QCD Corrections to Γ ( t → Wb )

Corrections of O(α 2 s) to the decay of the top quark into a W boson and a bottom quark are calculated. The method is based on an expansion of the top quark propa-gator for small external momentum, q, as compared to the top quark mass, M t. The physical point q 2 = M 2 t is reached through Padé approximations. The described method allows to take effects induced by a finite W boson mass into acc...

Higher Order Qcd Corrections In

Nonleading QCD corrections to e+eannihilation into hadrons are computed. Comparison with experiment is briefly discussed. (Submitted to Phys. Rev. Letters) * Work supported by the Department of Energy under contract number DE-AC03-76SF00515. ** Address after July 1, 1979: University of California at Los Angeles, Physics Department, Los Angeles, California 90024.

Higher-order Qcd Corrections to Γ

In the study of scattering phenomena in the limit of very large energies at fixed momentum transfer, one must face the fact that the two most promising probes of BFKL physics, namely smallx effects in DIS and large-rapidity-gap events in dijet production at hadron colliders, are inherently dependent upon long-distance physics, due to the presence of hadrons in the initial state; this poses seri...

Second-order QCD corrections to jet production at hadron colliders: the all-gluon contribution.

We report the calculation of next-to-next-to-leading order QCD corrections in the purely gluonic channel to dijet production and related observables at hadron colliders. Our result represents the first next-to-next-to-leading order calculation of a massless jet observable at hadron colliders, and opens the path towards precision QCD phenomenology with the LHC.