The Charge Radius of the Proton

Details The Charge Radius of the Proton The Charge Radius of the Proton

2011-09-26

arxiv.org/abs/1109.5708v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceedings of DPF2011, Meeting of the Division of Particles and Fields of the American Physical Society, Brown University, Pr

Scientific paper

Recently, the charge radius of the proton was extracted for the first time from muonic hydrogen. The value obtained is five standard deviations away from similar measurements of regular hydrogen. This talk discusses work done in collaboration with Richard J. Hill, to address this discrepancy. First, we have studied the extraction of the charge radius of the proton from electron-proton scattering data in a model-independent way. We have shown that previous extractions, spanning a period of over 40 years, have underestimated their errors. Second, we have looked at a model-independent analysis of proton structure effects for hydrogen-like bound states, using the tool of an effective field theory, namely NRQED. We have identified hidden model-dependent assumptions in the theoretical calculation behind the muonic hydrogen result.

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