@article{b9a7d3c4987a4fbaa05dfe8f6d5d6654,
title = "Measurement of beam asymmetry for π- Δ++ photoproduction on the proton at Eγ=8.5 GeV",
abstract = "We report a measurement of the π- photoproduction beam asymmetry for the reaction γp→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.",
author = "{The GlueX Collaboration} and S. Adhikari and Akondi, {C. S.} and A. Ali and M. Amaryan and A. Asaturyan and A. Austregesilo and Z. Baldwin and F. Barbosa and J. Barlow and E. Barriga and R. Barsotti and Beattie, {T. D.} and Berdnikov, {V. V.} and T. Black and W. Boeglin and Briscoe, {W. J.} and T. Britton and Brooks, {W. K.} and Cannon, {B. E.} and E. Chudakov and S. Cole and O. Cortes and V. Crede and Dalton, {M. M.} and T. Daniels and A. Deur and S. Dobbs and A. Dolgolenko and R. Dotel and M. Dugger and R. Dzhygadlo and H. Egiyan and T. Erbora and A. Ernst and P. Eugenio and C. Fanelli and S. Fegan and J. Fitches and Foda, {A. M.} and S. Furletov and L. Gan and H. Gao and A. Gasparian and C. Gleason and K. Goetzen and Goryachev, {V. S.} and L. Guo and H. Hakobyan and A. Hamdi and Barry Ritchie",
note = "Funding Information: This work was supported by the U.S. Department of Energy Office of Nuclear Physics under Award No. DE-FG02-05ER41374. We recognize additional support by the Natural Sciences and Engineering Research Council of Canada Grant No. SAPPJ-2018-00021. We acknowledge in particular input from from V. Mathieu to this work, as well as productive discussions with A. Szczepaniak, J. Nys, V. Mathieu, M. Mikhasenko, and B.-G. Yu. We would also like to acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab that made the experiment possible. This work was also supported in part by the U.S. Department of Energy, the U.S. National Science Foundation, the German Research Foundation, GSI Helmholtzzentrum f{\"u}r Schwerionenforschung GmbH, the Russian Foundation for Basic Research, the UK Science and Technology Facilities Council, the Chilean Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica, the National Natural Science Foundation of China, and the China Scholarship Council. This material is based on work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",
year = "2021",
month = feb,
doi = "10.1103/PhysRevC.103.L022201",
language = "English (US)",
volume = "103",
journal = "Physical Review C",
issn = "2469-9985",
publisher = "American Physical Society",
number = "2",
}