期刊
PHYSICAL REVIEW D
卷 90, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.053013
关键词
-
资金
- DFG [HA 1457/9-1]
To date the magnetic radius of the proton has been determined only by means of electron-proton scattering, which is not free of controversies. Any existing atomic determinations are irrelevant because they are strongly model dependent. We consider a so-called Zemach contribution to the hyperfine interval in ordinary and muonic hydrogen and derive a self-consistent model-independent value of the magnetic radius of the proton. More accurately, we constrain not a value of the magnetic radius by itself, but its certain combination with the electric-charge radius of the proton, namely, R-E(2) + R-M(2). The result from the ordinary hydrogen is found to be R-E(2) + R-M(2) = 1.35(12) fm(2), while the derived muonic value is 1.49(18) fm(2). That allows us to constrain the value of the magnetic radius of proton R-M = 0.78(8) fm at the 10% level.
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