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QED is not imperiled by the proton's running radii

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If you have a question about this talk, please contact Steve Chun Hay Kom.

The moments of the proton’s charge distribution, such as its mean-square radius, can be measured in various ways. Recent results based on the Lamb Shift in muonic hydrogen are 5 standard deviations away from those on ordinary hydrogen and e-p scattering, compiled by CODATA (the general-physics equivalent of the Particle-Data Group). This has been interpreted in diverse manners, including the demise of QED , the greatest blow ever to the Standard Model. I shall remind the audience of some of the atomic physics one may have forgotten and describe the muonic-hydrogen experiment, as well as the analysis of the rest of the data. For most—perhaps all—of the talk, the audience will be saying “I can’t believe it”.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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