The f_{D_s} Puzzle
High Energy Physics - Phenomenology
2009-12-05 v1 High Energy Physics - Experiment
High Energy Physics - Lattice
Abstract
Recent measurements of the branching fraction for D_s -> l nu disagree with the Standard Model by around 2sigma. In this case the key aspect of the Standard Model is the calculation of the decay constant, f_{D_s}, with lattice QCD. This talk surveys the experimental measurements, and explains how the lattice QCD calculations are done. Should the discrepancy strengthen again (it was earlier 3.8sigma), it would be a signal of new physics. Models that could explain such an effect are also discussed.
Cite
@article{arxiv.0912.0543,
title = {The f_{D_s} Puzzle},
author = {Andreas S. Kronfeld},
journal= {arXiv preprint arXiv:0912.0543},
year = {2009}
}
Comments
7 pp.; 1 fig.; prepared for the XXIX Physics in Collision, Kobe, Japan, August 30 - September 2, 2009