Status of the g-2 of the muon: trouble for the standard model or theorists' overconfidence

por Richard Williams (Depto. Física Teórica I, Universidad Complutense de Madrid)

jueves 24 may. 2012 15:00 → 16:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

A several year old discrepancy at the 2-3 sigma level between precision Standard Model computations of the muon's magnetic moment and experimental measurement defies theory. I quickly review the last measurements, the various contributions to the theory estimate that include a mind-boggling 5-loop QED calculation as well as high-order QCD and electroweak corrections, and concentrate especially on the hadronic contributions I will show how progress in the Dyson-Schwinger formulation of Chromodynamics provides a cross-check, extension and improvement over future lattice and existing quark model and effective Lagrangian estimates, highlighting the strengths and weaknesses of the various approaches.