First measurement of hard exclusive $π^- Δ^{++}$ electroproduction beam-spin asymmetries off the proton
Creators: name: Diehl, S.
name: Trotta, N.
name: Joo, K.
name: Achenbach, P.
name: Akbar, Z.
name: Armstrong, W. R.
name: Atac, H.
name: Avakian, H.
name: Baashen, L.
name: Baltzell, N. A.
name: Barion, L.
name: Bashkanov, M.
name: Battaglieri, M.
name: Bedlinskiy, I.
name: Benmokhtar, F.
name: Bianconi, A.
name: Biselli, A. S.
name: Bossu, F.
name: Brinkmann, K. -T.
name: Briscoe, W. J.
name: Bulumulla, D.
name: Burkert, V.
name: Capobianco, R.
name: Carman, D. S.
name: Carvajal, J. C.
name: Celentano, A.
name: Charles, G.
name: Chatagnon, P.
name: Chesnokov, V.
name: Ciullo, G.
name: Cole, P. L.
name: Contalbrigo, M.
name: Costantini, G.
name: Crede, V.
name: D'Angelo, A.
name: Dashyan, N.
name: De Vita, R.
name: Deur, A.
name: Djalali, C.
name: Dupre, R.
name: Ehrhart, M.
name: Alaoui, A. El
name: Fassi, L. El
name: Elouadrhiri, L.
name: Fegan, S.
name: Filippi, A.
name: Gavalian, G.
name: Glazier, D. I.
name: Golubenko, A. A.
name: Gosta, G.
name: Gothe, R. W.
name: Gotra, Y.
name: Griffioen, K.
name: Hafidi, K.
name: Hakobyan, H.
name: Hattawy, M.
name: Hayward, T. B.
name: Heddle, D.
name: Hobart, A.
name: Holtrop, M.
name: Illari, I.
name: Ireland, D. G.
name: Isupov, E. L.
name: Jo, H. S.
name: Johnston, R.
name: Keller, D.
name: Khachatryan, M.
name: Khanal, A.
name: Kim, A.
name: Kim, W.
name: Klimenko, V.
name: Kripko, A.
name: Kubarovsky, V.
name: Kuhn, S. E.
name: Lagerquist, V.
name: Lanza, L.
name: Leali, M.
name: Lee, S.
name: Lenisa, P.
name: Li, X.
name: MacGregor, I . J . D.
name: Marchand, D.
name: Mascagna, V.
name: Matousek, G.
name: McKinnon, B.
name: McLauchlin, C.
name: Meziani, Z. E.
name: Migliorati, S.
name: Milner, R. G.
name: Mineeva, T.
name: Mirazita, M.
name: Mokeev, V.
name: Moran, P.
name: Camacho, C. Munoz
name: Naidoo, P.
name: Neupane, K.
name: Niccolai, S.
name: Niculescu, G.
name: Osipenko, M.
name: Pandey, P.
name: Paolone, M.
name: Pappalardo, L. L.
name: Paremuzyan, R.
name: Paul, S. J.
name: Phelps, W.
name: Pilleux, N.
name: Pokhrel, M.
name: Poudel, J.
name: Price, J. W.
name: Prok, Y.
name: Radic, A.
name: Raue, B. A.
name: Reed, T.
name: Richards, J.
name: Ripani, M.
name: Ritman, J.
name: Rossi, P.
name: Sabatie, F.
name: Salgado, C.
name: Schadmand, S.
name: Schmidt, A.
name: Sharabian, Y. G.
name: Shrestha, U.
name: Sokhan, D.
name: Sparveris, N.
name: Spreafico, M.
name: Stepanyan, S.
name: Strakovsky, I.
name: Strauch, S.
name: Turisini, M.
name: Tyson, R.
name: Ungaro, M.
name: Vallarino, S.
name: Venturelli, L.
name: Voskanyan, H.
name: Voutier, E.
name: Watts, D. P.
name: Wei, X.
name: Williams, R.
name: Wishart, R.
name: Wood, M. H.
name: Yurov, M.
name: Zachariou, N.
name: Zhao, Z. W.
name: Zurek, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The polarized cross section ratio $σ_{LT'}/σ_{0}$ from hard exclusive $π^{-} Δ^{++}$ electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV / 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV$^{2}$ up to 7 GeV$^{2}$. The reaction provides a novel access to the $d$-quark content of the nucleon and to $p \rightarrow Δ^{++}$ transition generalized parton distributions. A comparison to existing results for hard exclusive $π^{+} n$ and $π^{0} p$ electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.