Andrzej Czarnecki

Muon anomalous magnetic moment: A harbinger for ''new physics''

Standard model loop contributions to the muon anomalous magnetic moment, a{sub {mu}}equivalent to(g{sub {mu}}-2)/2, and their theoretical uncertainties are scrutinized. The status and implications of the recently reported 2.6 sigma experiment versus theory deviation a{sub {mu}}{sup expt}-a{sub {mu}}{sup SM}=426(165) x 10{sup -11} are discussed. Possible explanations due to supersymmetric loop effects with m{sub SUSY}{approx_equal}55{sub -8}{sup +16}tan {beta} GeV, radiative mass mechanisms at the 1--2 TeV scale and other new physics scenarios are examined.

Lepton Spectra From Decays of Polarized Top Quarks

Abstract QCD corrections to the double differential lepton spectrum from the decay of a polarized top quark are calculated. It is shown that the factorization into energy-dependent and angular-dependent parts holds true also for the QCD corrected spectrum to a high degree of accuracy. A compact formula is given for the remaining small corrections.

Radiative corrections to b → cτντ

Abstract Analytical calculation is presented of the QCD radiative corrections to the rate of the process b → cτ ν τ and to the τ lepton longitudinal polarization in τ ν τ rest frame. The results are given in the form of one dimensional infrared finite integrals over the invariant mass of the leptons. We argue that this form may be optimal for phenomelogical applications due to a possible breakdown of semilocal hadron-parton duality in decays of heavy flavours.Analytical calculation is presented of the QCD radiative corrections to the rate of the process

Electroweak Fermion loop contributions to the muon anomalous magnetic moment

bto ctaubarnu_tau

Helicity fractions of W bosons from top quark decays at NNLO in QCD

and to the

Nonfactorizable QCD and Electroweak Corrections to the Hadronic Z Boson Decay Rate.

tau

Neutron Electric Dipole Moment in the Standard Model: Complete Three-Loop Calculation of the Valence Quark Contributions

lepton longitudinal polarization in

Electroweak radiative corrections to polarized Mo/ller scattering asymmetries

taubarnu_tau

Distributions of leptons in decays of polarised heavy quarks

rest frame. The results are given in the form of one dimensional infrared finite integrals over the invariant mass of the leptons. We argue that this form may be optimal for phenomelogical applications due to a possible breakdown of semilocal hadron-parton duality in decays of heavy flavours.

Two loop QCD corrections to b --> c transitions at zero recoil

The two-loop electroweak corrections to the anomalous magnetic moment of the muon, generated by fermionic loops, are calculated. An interesting role of the top quark in the anomaly cancellation is observed. New corrections, including terms of order