Physics Beyond the Standard Model

The Standard Model (SM) of electroweak and strong interactions has been enormously successful, but we know that it is only a low-energy effective theory of a more comprehensive theory of the forces of nature. The search for clues about the structure of this more comprehensive theory involves a three-pronged approach, including high energy collider searches, precision electroweak measurements, and studies of processes that are suppressed or forbidden in the SM.

My research interests have focused largely on precision electroweak and rare or forbidden processes. Most recently, my collaborators and I have carried out computations of contributions from supersymmetric extensions of the SM to these processes. An ongoing project involves calculating one-loop supersymmetric radiative corrections to both precision low-energy observables such as asymmetries measured in neutron b-decay and parity-violating electron scattering as well as observables studied in e+e- annihilation at high energies. We have also analyzed non-supersymmetric contributions to lepton flavor-violating processes, such as m to e conversion in nuclei, and have an on-going project to derive model-independent implications of the non-zero, but tiny, neutrino mass for beyond the SM operators that can contribute to precision electroweak observables (see the Neutrinos page).