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Publication Information
| Title | Measurement of Beam Asymmetry for $\pi^-\Delta^{++}$ Photoproduction on the Proton at $E_\gamma$=8.5 GeV | ||||
| Abstract | We report a measurement of the $\pi^-$ photoproduction beam asymmetry for the reaction $\vec{\gamma} p \rightarrow \pi^- \Delta^{++}$ using data from the \textsc{GlueX} experiment in the photon beam energy range 8.2--8.8~GeV. The asymmetry $\Sigma$ is measured as a function of four-momentum transfer $t$ to the $\Delta^{++}$ and compared to phenomenological models. We find that $\Sigma$ varies as a function of $t$: negative at smaller values and positive at higher values of $|t|$. The reaction can be described theoretically by $t$-channel particle exchange requiring pseudoscalar, vector, and tensor intermediaries. In particular, this reaction requires charge exchange, allowing us to probe pion exchange and the significance of higher-order corrections to one-pion exchange at low momentum transfer. Constraining production mechanisms of conventional mesons may aid in the search for and study of unconventional mesons. This is the first measurement of the process at this energy. | ||||
| Author(s) | Shankar Adhikari  , Chandrasekhar Akondi, Ahmed Ali, Moskov Amaryan , Arshak Asaturyan, Alexander Austregesilo , Zachary Baldwin, Fernando Barbosa, Jason Barlow , Edmundo Barriga , Rebecca Barsotti , Tegan Beattie , Vladimir Berdnikov , Timothy Black, Werner Boeglin , Bill Briscoe , Thomas Britton, Will Brooks , Bradford Cannon, Eugene Chudakov , Sebastian Cole, O. Cortes, Volker Crede , Mark Macrae Dalton , T. Daniels, Alexandre Deur, Sean Dobbs , Anatoly Dolgolenko, Rupesh Dotel , Michael Dugger, Roman Dzhygadlo , Hovanes Egiyan, Tolga Erbora , Ashley Ernst, Paul Eugenio , Cristiano Fanelli , Stuart Fegan , Jamie Fitches, Ahmed Foda , Sergey Furletov , Liping Gan , Haiyan Gao , Ashot Gasparian, Colin Gleason , Klaus Goetzen, V. Goryachev, Lei Guo , Hayk Hakobyan , Abdennacer Hamdi , Garth Huber , Andrew Hurley, David Ireland , Mark Ito , Igal Jaegle, Naomi Jarvis , Richard Jones , Vanik Kakoyan , Grzegorz Kalicy , Mahmoud Kamel, V. Khachatryan, Mariana Khatchatryan, C. Kourkoumelis, Sergey Kuleshov, Alison LaDuke , Ilya Larin, David Lawrence, Daniel Lersch, Hao Li, W. Li, Beijiang Liu , Kenneth Livingston , George Lolos, Kevin Luckas, V. Lyubovitskij, Dave Mack, Hrachya Marukyan , V. Matveev, Mike McCaughan, Michael McCracken , Will McGinley, Curtis Meyer , Rory Miskimen , Ryan Mitchell , Mizutani Keigo , Varun Neelamana, Frank Nerling, Lawrence Ng, Alexander Ostrovidov , Zisis Papandreou , Churamani Paudel , Peter Hurck , Ron Pedroni, Lubomir Pentchev, Klaus Peters, William Phelps, Eric Pooser , Joerg Reinhold , Barry Ritchie , James Ritman, Gabriel Rodriguez, Dmitry Romanov, C. Romero, Carlos Salgado , Susan Schadmand , Amy Schertz , Andrew Schick, Reinhard Schumacher , Joachim Schwiening , X. Shen, Matt Shepherd , Drew Smith , Elton Smith , Dan Sober , Alexander Somov, Sergey Somov, O. Soto, Justin Stevens , I. Strakovsky, Brandon Sumner , Karthik Suresh , Victor Tarasov , Simon Taylor, Aram Teymurazyan , Annika Thiel , Georgios Vasileiadis, Timothy Whitlatch, Nilanga Wickramaarachchi , Mike Williams, Yunjie Yang, Jon Zarling , Zhenyu Zhang , Zhiwen Zhao , J. Zhou, Qiao Zhou, X. Zhou, Benedikt Zihlmann |
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| Publication Date | February 2021 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Exp Nuclear Physics / Experimental Halls / Hall D | ||||
| Funding Source | Nuclear Physics (NP), DE-FG02-05ER41374, SAPPJ-2018-00021 | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E12-06-102
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| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review C |
| Refereed | Yes |
| Volume | 103 |
| Issue | |
| Page(s) | L022201 |
Attachments/Datasets/DOI Link
| Document(s) |
Pi__Beam_Asymmetry_PRC (1)1.pdf
(STI Document)
2009.07326(1).pdf
(Accepted Manuscript)
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| DOI Link | |
| Dataset(s) | (none) |
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