Weak radius of the proton

C. J. Horowitz

doi:10.1016/j.physletb.2018.12.029

Weak radius of the proton

C. J. Horowitz

Indiana University Bloomington

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The weak charge of the proton determines its coupling to the Z⁰ 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±0.017 fm is 80% larger than its charge radius R_ch≈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.

Original language	English
Pages (from-to)	675-678
Number of pages	4
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	789
DOIs	https://doi.org/10.1016/j.physletb.2018.12.029
State	Published - 10 Feb 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 The Author

Funding

We thank Bill Donnelly, Farrukh Fattoyev, Misha Gorshteyn, Zidu Lin, Jerry Miller, Seamus Riordan, and Mike Snow for helpful discussions. This work was started at the Mainz Institute for Theoretical Physics and we thank them for their hospitality. This material is based upon work supported by the U.S. Department of Energy Office of Science, Office of Nuclear Physics under Awards DE-FG02-87ER40365 (Indiana University) and DE-SC0018083 (NUCLEI SciDAC-4 Collaboration). We thank Bill Donnelly, Farrukh Fattoyev, Misha Gorshteyn, Zidu Lin, Jerry Miller, Seamus Riordan, and Mike Snow for helpful discussions. This work was started at the Mainz Institute for Theoretical Physics and we thank them for their hospitality. This material is based upon work supported by the U.S. Department of Energy Office of Science, Office of Nuclear Physics under Awards DE-FG02-87ER40365 (Indiana University) and DE-SC0018083 (NUCLEI SciDAC-4 Collaboration).

Funders	Funder number
Office of Nuclear Physics
U.S. Department of Energy Office of Science
U.S. Department of Energy	DE-FG02-87ER40365
Indiana University	DE-SC0018083

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10.1016/j.physletb.2018.12.029

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Weak radius of the proton

Abstract

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