1999/02/11 by Walter D. Goldberger, Goldberger, Walter D. · 1 citation
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9902311
16 pages, Latex
arxiv created 1999/02/11 · arxiv updated 2009/11/30
Physics beyond the Standard Model could be measured indirectly, through its effects on Standard Model observables. One place to look for such effects is in the semileptonic decays of B mesons. In order to constrain the possible role of new physics on semileptonic B decays, we present the most general low energy effective Lagrangian constructed from all dimension six four-fermion operators that contribute to the process b-> c l- nu. We then use it to compute the corrections due to new physics to the differential decay rates for the exclusive processes B-> D(*) l- nu, as well as the inclusive decays B-> X l- nu. Both inclusive and exclusive rates are expressed in terms of a set of parameters that characterize the types of four-fermion interactions that can be induced by physics beyond the Standard Model. Although it is not particularly useful to carry out a full analysis until data from the next generation of B factories becomes available, here we illustrate how the existing experimental results can be used to constrain some of these parameters.