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Publication Information
Title Determination of two-photon exchange via $e^+p/e^-p$ Scattering with CLAS12
Abstract The proton elastic form factor ratio shows a discrepancy between measurements using the Rosenbluth technique in unpolarized beam and target experiments and measurements using polarization degrees of freedom. The proposed explanation of this discrepancy is uncorrected hard two-photon exchange (TPE), a type of radiative correction that is conventionally neglected. The effect size and agreement with theoretical predictions has been tested recently by three experiments. While the results support the existence of a small two-photon exchange effect, they cannot establish that theoretical treatments are valid. At larger momentum transfers, theory remains untested. This proposal aims to measure two-photon exchange over an extended and so far largely untested $Q^2$ and $\varepsilon$ range with high precision using the {\tt CLAS12} experiment. Such data are crucial to clearly confirm or rule out TPE as the driver for the discrepancy as well as test several theoretical approaches, believed valid
Author(s) Jan Bernauer, Volker Burkert, Ethan Cline, Axel Schmidt, Youri Sharabian
Publication Date April 2021
Document Type Journal Article
Primary Institution Stony Brook University, Stony Brook, New York 11794, USA
Affiliation Exp Nuclear Physics / Experimental Halls / Hall B
Funding Source Nuclear Physics (NP), NSF PHY-2012114.
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-21-3509 OSTI Number: 1824203
LANL Number: arXiv:2103.03948 Other Number: DOE/OR/23177-5326
Associated with an experiment No
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Journal Article
Journal Name European Physical Journal A
Refereed Yes
Volume 57
Issue
Page(s) 144
Attachments/Datasets/DOI Link
Document(s)
2103.03948.pdf (STI Document)
2103.03948.pdf (Accepted Manuscript)
DOI Link
Dataset(s) (none)
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