Authors: Matti Pitkänen
The recent discovery that the charge radius of proton deduced from quantum average of nuclear charge density from the muonic version of hydrogen atom is 4 per cent smaller than the radius deduced from hydrogen atom challenges either QED or the view about proton or both. In TGD framework topological quantization leads to the notion of field body as a characteristic of any system. Field body is expected to contain substructures with sizes given by the primary and secondary p-adic length scales at at least. u and d quarks would have field bodies with size much larger than proton itself. In muonic atom the p-adic size scale of the field body of u quark having mass of 2 MeV according to the last estimates would be roughly twice the Boh radius so that the anomaly might be understood as a signature of field body.
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