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Title Measurement of Beam Asymmetry for $\pi^-\Delta^{++}$ Photoproduction on the Proton at $E_\gamma$=8.5 GeV
Authors 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,Tim Black,Werner Boeglin,William Briscoe,Thomas Britton,William Brooks,Bradford Cannon,Eugene Chudakov,Sebastian Cole,Olga Cortes,Volker Crede,Mark Dalton,Tim 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. S. 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,Wenliang B. Li,Beijiang Liu,Kenneth Livingston,George Lolos,Kevin Luckas,Valery Lyubovitskij,David Mack,Hrachya Marukyan,V. Matveev,Michael McCaughan,Michael McCracken,Will McGinley,Curtis Meyer,Rory Miskimen,Ryan Mitchell,Keigo Mizutani,Varun Neelamana,Frank Nerling,Lawrence Ng,Alexander Ostrovidov,Zisis Papandreou,Churamani Paudel,Peter Pauli,Ronald 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,Matthew Shepherd,Andrew Smith,Elton Smith,Daniel Sober,Alexander Somov,Sergey Somov,Orlando Soto,Justin Stevens,Igor Strakovsky,Brandon Sumner,Karthik Suresh,Victor Tarasov,Simon Taylor,Aram Teymurazyan,Annika Thiel,Georgios Vasileiadis,Timothy Whitlatch,Nilanga Wickramaarachchi,Mike Williams,Yunjie Yang,Jonathan Zarling,Zhenyu Zhang,zhiwen zhao,J. Zhou,Qiao Zhou,X. Zhou,Benedikt Zihlmann
JLAB number JLAB-PHY-20-3256
LANL number arXiv:2009.07326
Other number DOE/OR/23177-5046
Document Type(s) (Journal Article) 
Associated with EIC: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)
Other Funding:DE-FG02-05ER41374
SAPPJ-2018-00021
 

Journal
Compiled for Physical Review C
Refereed
Publication 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.
Experiment Numbers:
Group: Hall D
Document: pdf
DOI:
Accepted Manuscript:
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