= A. Ishida
{c}
{tag=Physicist}
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>.<New Precision Measurement of Hyperfine Splitting of Positronium by A. Ishida and others>[Abstract: nonthermalization correction and revised comparison with QED, 2014 version]{ref}
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