We determine the η − η ′ mixing angle via a procedure relatively independent of theoretical assumptions by simultaneously fitting η, η ′ reactions involving the anomaly-η, η ′ → γγ, π + π − γ. We extract reasonably precise renormalized values of the octet and singlet pseudoscalar decay constants F 8 , F 0 , as well as the mixing angle θ.
Electric-dipole moments of paramagnetic atoms can provide important insights into a unique kind of CP violation involving Higgs-boson-mediated interactions between leptons and hadrons. We report a limit for the coupling constant of such an interaction by combining the results of our relativistic many-body calculations and experimental data on the electric-dipole moment of atomic thallium. The importance of electron correlation in determining this limit is highlighted and its significance in the context of particle physics and cosmology is pointed out.
The traditional analysis of RC circuits with constant resistance fails to adequately account for the charging characteristics of a capacitor in series with a lamp. We find that a simple model for the changing resistance of the lamp provides a good fit to the time-varying current in the circuit. This experiment can readily be performed in an introductory physics laboratory.
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