STI Publications - View Publication Form #16794
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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 |
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| 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)
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| DOI Link | |
| Dataset(s) | (none) |
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