TL;DR
This paper reviews the discrepancy between experimental measurements and lattice QCD calculations of the D_s decay constant, discussing potential implications for new physics if the deviation persists.
Contribution
It surveys current experimental results and explains lattice QCD methods for calculating f_{D_s}, highlighting the significance of the discrepancy for new physics searches.
Findings
Experimental measurements of D_s -> l nu decay differ from lattice QCD predictions.
The discrepancy was previously 3.8sigma, now around 2sigma.
Potential new physics explanations are discussed.
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.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research