Measurement of Spin-Density Matrix Elements in $ρ(770)$ Production with a Linearly Polarized Photon Beam at $E_γ= 8.2\,-\,8.8\,\text{GeV}$
Creators: name: GlueX Collaboration
name: Adhikari, S.
name: Afzal, F.
name: Akondi, C. S.
name: Albrecht, M.
name: Amaryan, M.
name: Arroyave, V.
name: Asaturyan, A.
name: Austregesilo, A.
name: Baldwin, Z.
name: Barbosa, F.
name: Barlow, J.
name: Barriga, E.
name: Barsotti, R.
name: Beattie, T. D.
name: Berdnikov, V. V.
name: Black, T.
name: Boeglin, W.
name: Briscoe, W. J.
name: Britton, T.
name: Brooks, W. K.
name: Byer, D.
name: Chudakov, E.
name: Cole, P. L.
name: Cortes, O.
name: Crede, V.
name: Dalton, M. M.
name: Darulis, D.
name: Deur, A.
name: Dobbs, S.
name: Dolgolenko, A.
name: Dotel, R.
name: Dugger, M.
name: Dzhygadlo, R.
name: Ebersole, D.
name: Edo, M.
name: Egiyan, H.
name: Erbora, T.
name: Eugenio, P.
name: Fabrizi, A.
name: Fanelli, C.
name: Fang, S.
name: Fegan, S.
name: Fitches, J.
name: Foda, A. M.
name: Furletov, S.
name: Gan, L.
name: Gao, H.
name: Gardner, A.
name: Gasparian, A.
name: Gleason, C.
name: Goetzen, K.
name: Goryachev, V. S.
name: Grube, B.
name: Guo, J.
name: Guo, L.
name: Hague, T. J.
name: Hakobyan, H.
name: Hernandez, J.
name: Hoffman, N. D.
name: Hornidge, D.
name: Hou, G.
name: Huber, G. M.
name: Hurck, P.
name: Hurley, A.
name: Imoehl, W.
name: Ireland, D. G.
name: Ito, M. M.
name: Jaegle, I.
name: Jarvis, N. S.
name: Jeske, T.
name: Jones, R. T.
name: Kakoyan, V.
name: Kalicy, G.
name: Khachatryan, V.
name: Khatchatryan, M.
name: Kourkoumelis, C.
name: LaDuke, A.
name: Larin, I.
name: Lawrence, D.
name: Lersch, D. I.
name: Li, H.
name: Liu, B.
name: Livingston, K.
name: Lolos, G. J.
name: Lorenti, L.
name: Lyubovitskij, V.
name: Ma, R.
name: Mack, D.
name: Mahmood, A.
name: Marukyan, H.
name: Matveev, V.
name: McCaughan, M.
name: McCracken, M.
name: Meyer, C. A.
name: Miskimen, R.
name: Mitchell, R. E.
name: Mizutani, K.
name: Neelamana, V.
name: Ng, L.
name: Nissen, E.
name: Orešić, S.
name: Ostrovidov, A. I.
name: Papandreou, Z.
name: Paudel, C.
name: Pedroni, R.
name: Pentchev, L.
name: Peters, K. J.
name: Prather, E.
name: Rakshit, S.
name: Reinhold, J.
name: Remington, A.
name: Ritchie, B. G.
name: Ritman, J.
name: Rodriguez, G.
name: Romanov, D.
name: Saldana, K.
name: Salgado, C.
name: Schadmand, S.
name: Schertz, A. M.
name: Scheuer, K.
name: Schick, A.
name: Schmidt, A.
name: Schumacher, R. A.
name: Schwiening, J.
name: Sharp, P.
name: Shen, X.
name: Shepherd, M. R.
name: Smith, A.
name: Smith, E. S.
name: Sober, D. I.
name: Somov, A.
name: Somov, S.
name: Stevens, J. R.
name: Strakovsky, I. I.
name: Sumner, B.
name: Suresh, K.
name: Tarasov, V. V.
name: Taylor, S.
name: Teymurazyan, A.
name: Thiel, A.
name: Viducic, T.
name: Whitlatch, T.
name: Wickramaarachchi, N.
name: Williams, M.
name: Wunderlich, Y.
name: Yu, B.
name: Zarling, J.
name: Zhang, Z.
name: Zhao, Z.
name: Zhou, J.
name: Zhou, X.
name: Zihlmann, B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized $8.5\,\text{GeV}$ photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson $ρ$(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of $s$-channel helicity conservation at small squared four-momentum transfer $t$ and are able to extract the $t$-dependence of natural and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full $t$ range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced $ρ(770)$ differ by two units are negligible for $-t&lt;0.5\,\text{GeV}^{2}/c^{2}$.
description: 15 pages, 11 figures