Weak radius of the proton

Abstract

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.

4 pages, 2 figures, Error estimate improved, Phys. Lett. B in press

References in corpus (6)

• Precision Measurement of the Weak Charge of the Proton
• Proton and neutron electromagnetic form factors and uncertainties
• Realistic Transverse Images of the Proton Charge and Magnetic Densities
• Electromagnetic form factors of the nucleon: new fit and analysis of uncertainties
• The neutron skin thickness of ${}^{48}$Ca from a nonlocal-dispersive-optical-model analysis
• The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer

Cited by in corpus (4)

• Incorporating the weak mixing angle dependence to reconcile the neutron skin measurement on 208Pb by PREX-II
• Measuring the surface thickness of the weak charge density of nuclei
• Supernova Neutrinos as a Precise Probe of Nuclear Neutron Skin
• Searching for new physics from SMEFT and leptoquarks at the P2 experiment