Proton size anomaly

Details Proton size anomaly Proton size anomaly

2010-11-15

arxiv.org/abs/1011.3519v2

Phys.Rev.Lett.106:153001,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures. Version to appear in PRL

Scientific paper

10.1103/PhysRevLett.106.153001

A measurement of the Lamb shift in muonic hydrogen yields a charge radius of the proton that is smaller than the CODATA value by about 5 standard deviations. We explore the possibility that new scalar, pseudoscalar, vector, and tensor flavor-conserving nonuniversal interactions may be responsible for the discrepancy. We consider exotic particles that among leptons, couple preferentially to muons, and mediate an attractive nucleon-muon interaction. We find that the many constraints from low energy data disfavor new spin-0, spin-1 and spin-2 particles as an explanation.

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