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- W2956327594 abstract "The excess mass of the neutron over the proton arises from two sources within the Standard Model, electromagnetism and the splitting of the down and up quark masses. The Cottingham Formula provides a means of determining the QED corrections from the forward Compton Amplitude, but this is challenged by the need for a subtraction function and the mixing of the QED and QCD (electro-weak) effects. I review the present understanding of the Cottingham Formula, including a discussion on the development of the formula, its renormalization which induces the mixing of QED and QCD effects, and the necessary modeling of the subtraction function that must be done to arrive a numerical prediction. I summarize the Regge Model originally proposed by Gasser and Leutwyler and I also review the proposed model by Walker-Loud, Carlson and Miller, which is an interpolation function between the low and high $Q^2$ regimes, both of which are anchored by rigorous theoretical underpinnings, for which I argue a more reliable theoretical uncertainty estimate can be obtained." @default.
- W2956327594 created "2019-07-23" @default.
- W2956327594 creator A5079740130 @default.
- W2956327594 date "2019-07-11" @default.
- W2956327594 modified "2023-09-27" @default.
- W2956327594 title "On the Cottingham formula and the electromagnetic contribution to the proton-neutron mass splitting." @default.
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