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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
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
JLAB Number: JLAB-PHY-20-3256 OSTI Number: 1767978
LANL Number: arXiv:2009.07326 Other Number: DOE/OR/23177-5046
Associated with an experiment Yes
Experiment Number(s)
E12-06-102
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)
2009.07326(1).pdf (Accepted Manuscript)
DOI Link
Dataset(s) (none)
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