Determining the size of the proton

Details Determining the size of the proton Determining the size of the proton

2012-03-02

arxiv.org/abs/1203.0581v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, LaTex

Scientific paper

A measurement of the Lamb shift of 49,881.88(76) GHz in muonic hydrogen in conjunction with theoretical estimates of the proton structure effects was recently used to deduce an accurate but rather small radius of the proton. Such an important shift in the understanding of fundamental values needs reconfirmation. Using a different approach with electromagnetic form factors of the proton, we obtain a new expression for the transition energy, $\Delta = E_{2P_{{3}/{2}}}^{f=2} - E_{2S_{{1}/{2}}}^{f=1}$, in muonic hydrogen and deduce a proton radius, $r_p = 0.83623$ fm.

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