An experimental physicist who led a precision measurement of the hyperfine structure of positronium. The collaboration explicitly measured the bias caused by incomplete thermalization, rather than assuming that newly formed positronium had already reached the gas temperature. Correcting this effect changed the comparison with quantum electrodynamics, illustrating how collision dynamics can limit a precision test of a bound state.[ref]
New Precision Measurement of Hyperfine Splitting of Positronium by A. Ishida and others. Abstract: nonthermalization correction and revised comparison with QED, 2014 version
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