Weak radius of the proton

The weak charge of the proton determines its coupling to the $Z^0$ boson. The distribution of weak charge is found to be dramatically different from the distribution of electric charge. The proton's weak radius $R_W$ = 1.545 $\pm$ 0.017 fm is 80% larger than its charge radius $R_{ch}$ $\approx$ 0.84 fm because of a very large pion cloud contribution. This large weak radius can be measured with parity violating electron scattering and may provide insight into the structure of the proton, various radiative corrections, and possible strange quark contributions.


Publication Date:
Feb 10 2019
Date Submitted:
Jul 01 2019
Pagination:
675
Citation:
Physics Letters B
789
External Resources:




 Record created 2019-07-01, last modified 2019-08-05


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