Measurement of beam asymmetry for <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mi>π</mi><mo>−</mo></msup><msup><mi mathvariant="normal">Δ</mi><mrow><mo>+</mo><mo>+</mo></mrow></msup></mrow></math> photoproduction on the proton at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi><mi>γ</mi></msub><mo>=</mo><mn>8.5</mn><mspace width="0.16em"></mspace><mi>GeV</mi></mrow></math>

The <span class="sc">GlueX</span> Collaboration; S. Adhikari; C. S. Akondi; A. Ali; M. Amaryan; A. Asaturyan; A. Austregesilo; Z. Baldwin; F. Barbosa; J. Barlow; E. Barriga; R. Barsotti; T. D. Beattie; V. V. Berdnikov; T. Black; W. Boeglin; W. J. Briscoe; T. Britton; W. K. Brooks; B. E. Cannon; E. Chudakov; S. Cole; O. Cortes; V. Crede; M. M. Dalton; T. Daniels; A. Deur; S. Dobbs; A. Dolgolenko; R. Dotel; M. Dugger; R. Dzhygadlo; H. Egiyan; T. Erbora; A. Ernst; P. Eugenio; C. Fanelli; S. Fegan; J. Fitches; A. M. Foda; S. Furletov; L. Gan; H. Gao; A. Gasparian; C. Gleason; K. Goetzen; V. S. Goryachev; L. Guo; H. Hakobyan; A. Hamdi; G. M. Huber; A. Hurley; D. G. Ireland; M. M. Ito; I. Jaegle; N. S. Jarvis; R. T. Jones; V. Kakoyan; G. Kalicy; M. Kamel; V. Khachatryan; M. Khatchatryan; C. Kourkoumelis; S. Kuleshov; A. LaDuke; I. Larin; D. Lawrence; D. I. Lersch; H. Li; W. B. Li; B. Liu; K. Livingston; G. J. Lolos; K. Luckas; V. Lyubovitskij; D. Mack; H. Marukyan; V. Matveev; M. McCaughan; M. McCracken; W. McGinley; C. A. Meyer; R. Miskimen; R. E. Mitchell; K. Mizutani; V. Neelamana; F. Nerling; L. Ng; A. I. Ostrovidov; Z. Papandreou; C. Paudel; P. Pauli; R. Pedroni; L. Pentchev; K. J. Peters; W. Phelps; E. Pooser; J. Reinhold; B. G. Ritchie; J. Ritman; G. Rodriguez; D. Romanov; C. Romero; C. Salgado; S. Schadmand; A. M. Schertz; A. Schick; R. A. Schumacher; J. Schwiening; X. Shen; M. R. Shepherd; A. Smith; E. S. Smith; D. I. Sober; A. Somov; S. Somov; O. Soto; J. R. Stevens; I. I. Strakovsky; B. Sumner; K. Suresh; V. V. Tarasov; S. Taylor; A. Teymurazyan; A. Thiel; G. Vasileiadis; T. Whitlatch; N. Wickramaarachchi; M. Williams; Y. Yang; J. Zarling; Z. Zhang; Z. Zhao; J. Zhou; Q. Zhou; X. Zhou; B. Zihlmann

doi:10.1103/PhysRevC.103.L022201

Letter

Measurement of beam asymmetry for $π^{-} Δ^{+ +}$ photoproduction on the proton at $E_{γ} = 8.5 GeV$

S. Adhikari²³, C. S. Akondi⁸, A. Ali¹¹, M. Amaryan²³, A. Asaturyan²⁸, A. Austregesilo³, Z. Baldwin³, F. Barbosa¹⁵, J. Barlow⁸ et al. (The GlueX Collaboration)

J. Barlow⁸, E. Barriga⁸, R. Barsotti¹³, T. D. Beattie²⁴, V. V. Berdnikov¹⁹, T. Black²², W. Boeglin⁷, W. J. Briscoe⁹, T. Britton¹⁵, W. K. Brooks²⁵, B. E. Cannon⁸, E. Chudakov¹⁵, S. Cole¹, O. Cortes⁹, V. Crede⁸, M. M. Dalton¹⁵, T. Daniels²², A. Deur¹⁵, S. Dobbs⁸, A. Dolgolenko¹⁴, R. Dotel⁷, M. Dugger¹, R. Dzhygadlo¹¹, H. Egiyan¹⁵, T. Erbora⁷, A. Ernst⁸, P. Eugenio⁸, C. Fanelli¹⁸, S. Fegan⁹, J. Fitches¹⁰, A. M. Foda²⁴, S. Furletov¹⁵, L. Gan²², H. Gao⁶, A. Gasparian²¹, C. Gleason¹³, K. Goetzen¹¹, V. S. Goryachev¹⁴, L. Guo⁷, H. Hakobyan²⁵, A. Hamdi¹¹, G. M. Huber²⁴, A. Hurley²⁹, D. G. Ireland¹⁰, M. M. Ito¹⁶, I. Jaegle¹⁵, N. S. Jarvis³, R. T. Jones⁵, V. Kakoyan²⁸, G. Kalicy⁴, M. Kamel⁷, V. Khachatryan⁶, M. Khatchatryan⁷, C. Kourkoumelis², S. Kuleshov²⁵, A. LaDuke³, I. Larin¹⁷, D. Lawrence¹⁵, D. I. Lersch⁸, H. Li³, W. B. Li²⁹, B. Liu¹², K. Livingston¹⁰, G. J. Lolos²⁴, K. Luckas¹⁶, V. Lyubovitskij^26,27, D. Mack¹⁵, H. Marukyan²⁸, V. Matveev¹⁴, M. McCaughan¹⁵, M. McCracken³, W. McGinley³, C. A. Meyer³, R. Miskimen¹⁷, R. E. Mitchell¹³, K. Mizutani¹⁵, V. Neelamana²⁴, F. Nerling¹¹, L. Ng⁸, A. I. Ostrovidov⁸, Z. Papandreou²⁴, C. Paudel⁷, P. Pauli¹⁰, R. Pedroni²¹, L. Pentchev¹⁵, K. J. Peters¹¹, W. Phelps⁹, E. Pooser¹⁵, J. Reinhold⁷, B. G. Ritchie¹, J. Ritman¹⁶, G. Rodriguez⁸, D. Romanov¹⁹, C. Romero²⁵, C. Salgado²⁰, S. Schadmand¹⁶, A. M. Schertz²⁹, A. Schick¹⁷, R. A. Schumacher³, J. Schwiening¹¹, X. Shen¹¹, M. R. Shepherd ^13,*, A. Smith⁶, E. S. Smith¹⁵, D. I. Sober⁴, A. Somov¹⁵, S. Somov¹⁹, O. Soto²⁵, J. R. Stevens²⁹, I. I. Strakovsky⁹, B. Sumner¹, K. Suresh²⁴, V. V. Tarasov¹⁴, S. Taylor¹⁵, A. Teymurazyan²⁴, A. Thiel¹⁰, G. Vasileiadis², T. Whitlatch¹⁵, N. Wickramaarachchi⁴, M. Williams¹⁹, Y. Yang¹⁸, J. Zarling^24,†, Z. Zhang³⁰, Z. Zhao⁶, J. Zhou⁶, Q. Zhou¹², X. Zhou³⁰, and B. Zihlmann¹⁵ (The GlueX Collaboration)

¹Arizona State University, Tempe, Arizona 85287, USA
²National and Kapodistrian University of Athens, 15771 Athens, Greece
³Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁴The Catholic University of America, Washington, D.C. 20064, USA
⁵University of Connecticut, Storrs, Connecticut 06269, USA
⁶Duke University, Durham, North Carolina 27708, USA
⁷Florida International University, Miami, Florida 33199, USA
⁸Florida State University, Tallahassee, Florida 32306, USA
⁹The George Washington University, Washington, D.C. 20052, USA
¹⁰University of Glasgow, Glasgow G12 8QQ, United Kingdom
¹¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
¹²Institute of High Energy Physics, Beijing 100049, People's Republic of China
¹³Indiana University, Bloomington, Indiana 47405, USA
¹⁴Alikhanov Institute for Theoretical and Experimental Physics NRC Kurchatov Institute, Moscow 117218, Russia
¹⁵Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
¹⁶Forschungszentrum Juelich Nuclear Physics Institute, 52425 Juelich, Germany
¹⁷University of Massachusetts, Amherst, Massachusetts 01003, USA
¹⁸Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
¹⁹National Research Nuclear University Moscow Engineering Physics Institute, Moscow 115409, Russia
²⁰Norfolk State University, Norfolk, Virginia 23504, USA
²¹North Carolina A&T State University, Greensboro, North Carolina 27411, USA
²²University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA
²³Old Dominion University, Norfolk, Virginia 23529, USA
²⁴University of Regina, Regina, Saskatchewan, Canada S4S 0A2
²⁵Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile
²⁶Tomsk State University, 634050 Tomsk, Russia
²⁷Tomsk Polytechnic University, 634050 Tomsk, Russia
²⁸A. I. Alikhanian National Science Laboratory (Yerevan Physics Institute), 0036 Yerevan, Armenia
²⁹William & Mary, Williamsburg, Virginia 23185, USA
³⁰Wuhan University, Wuhan, Hubei 430072, People's Republic of China

^*mashephe@indiana.edu
^†jzarling@jlab.org

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Phys. Rev. C 103, L022201 – Published 22 February, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.L022201

Abstract

We report a measurement of the $π^{-}$ photoproduction beam asymmetry for the reaction $\vec{γ} p \to π^{-} Δ^{+ +}$ using data from the GlueX experiment in the photon beam energy range 8.2–8.8 GeV. The asymmetry $Σ$ is measured as a function of four-momentum transfer $t$ to the $Δ^{+ +}$ and compared to phenomenological models. We find that $Σ$ 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.

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Measurement of beam asymmetry for $π^{-} Δ^{+ +}$ photoproduction on the proton at $E_{γ} = 8.5 GeV$

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Measurement of beam asymmetry for π−Δ++ photoproduction on the proton at Eγ=8.5GeV

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Measurement of beam asymmetry for $π^{-} Δ^{+ +}$ photoproduction on the proton at $E_{γ} = 8.5 GeV$