{"paper":{"title":"Exclusive photoproduction of $\\pi^0$ up to large values of Mandelstam variables $s, t$ and $u$ with CLAS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","nucl-ex","nucl-th"],"primary_cat":"hep-ex","authors_text":"10 F. Sabatie, 10 G.P. Gilfoyle, 11, 12 L. Clark, 13, 13 H. Avakian, 14 A. DAngelo, 14 G. Fedotov, 14 M. Paolone, 15 J.A. Tan, 16 J. Ritman, 16 M. Taiuti, 16 O. Pogorelko, 16 V. Kubarovsky, 16 W.K. Brooks, 17 M. Contalbrigo, 17 V. Crede, 18 G.R. Goldstein, 18 K. Livingston, 18 M.J. Amaryan, 18 R.A. Schumacher, 19, 19 C. Munoz Camacho, 19 D. Lersch, 19 L. Barion, 19 M. Battaglieri, 19 O. Cortes, 1 H. Hakobyan, 1 K. Hicks, 20 P.V. Degtyarenko, 21, 21 A.I. Ostrovidov, 21 B.G. Ritchie, 21 E. De Sanctis, 21 G. Charles, 21 V. Batourine, 22, 23 A. Fradi, 24 D.P. Watts, 24 G. Gavalian, 24 G. Niculescu, 24 H. Egiyan, 24 K. Hafidi, 24 P. Nadel-Turonski, 25 A.S. Biselli, 25 J. Poudel, 26 F.X. Girod, 26 M. Osipenko, 27 A. Klein, 27 I. Bedlinskiy, 27 M. Ungaro, 28 D. Keller, 28 L. Elouadrhiri, 28 S Adhikari, 29 C.E. Hyde, 29 Y. Ghandilyan, 2 A. Rizzo, 2 R. Dupre, 3, 30, 30 S. Schadmand, 31 G. Ciullo, 31 M. Holtrop, 31 R. Fersch, 32, 32 B. McKinnon, 32 D.G. Ireland, 32 F. Klein, 32 J.M. Laget, 32 J.W. Price, 32 M. Khandaker, 32 T. Chetry, 32 V.D. Burkert, 32 W. Phelps, 32 X. Wei, 33 H. Voskanyan, 34 K.L. Giovanetti, 35 G. Rosner, 35 N. Dashyan, 35 P. Lenisa, 36 D.G. Ireland, 36 D. Jenkins, 36 E.L. Isupov, 36 R.A. Montgomery, 36 R.W. Gothe, 37, 37 E. Pasyuk, 37 K.A. Griffioen, 37 M. Dugger, 38 K. Park, 38 S. Strauch, 39, 39 A. Celentano, 39 A. El Alaoui, 39 C. Djalali, 39 D.I. Glazier, 39 D. Payette, 39 D.P. Weygand, 39 F. Cao, 39 Iu. Skorodumina, 39 J. Ball, 39 M. Defurne, 39 M. Guidal, 39 M. Hattawy, 39 P. Eugenio, 39 S. Bueltmann, 39 S.E. Kuhn, 39 S. Niccolai, 39 W.J. Briscoe, 40, 40 L. El Fassi, 41 J. Zhang, 41 L. Weinstein, 42 A Movsisyan, 42 A. Roy, 42 B.S. Ishkhanov, 42 D.I. Sober, 42 D. Sokhan, 42 I .J .D. MacGregor, 42 M. Ripani, 42 N. Markov, 42 P. L. Cole, 42 T. Mineeva, 42 W. Gohn, 43 K.P. Adhikari, 44 K. Joo, 45, 45 D. Protopopescu, 45 G. Khachatryan, 46 A. Filippi, 46 L. Guo, 47 E. Voutier, 47 M. Khachatryan, 47 N. Harrison, 47 R. De Vita, 47 S. Ghosh, 4 S. Procureur, 5 S. Boiarinov, 5 Y.G. Sharabian, 6, 6 N. Sparveris, 7 A. Deur, 7 C. Salgado, 7 I. Balossino, 7 L. Lanza, 7 Y. Prok, 8, 8 N. Zachariou, 9, 9 D.S. Carman, 9 G. Mbianda, 9 M.L. Kabir, 9 V. Mokeev, 9 W. Kim, A. Kim, E. Golovatch, I.I. Strakovsky, M.C. Kunkel, Z.W. Zhao32 (The CLAS Collaboration)","submitted_at":"2017-12-29T18:59:04Z","abstract_excerpt":"Exclusive photoproduction cross sections have been measured for the process $\\gamma p \\rightarrow p\\pi^0(e^+e^-(\\gamma))$ with the Dalitz decay final state using tagged photon energies in the range of $E_{\\gamma} = 1.275-5.425$ GeV. The complete angular distribution of the final state $\\pi^0$, for the entire photon energy range up to large values of $t$ and $u$, has been measured for the first time. The data obtained show that the cross section $d\\sigma/dt$, at mid to large angles, decreases with energy as $s^{-6.89\\pm 0.26} $. This is in agreement with the perturbative QCD quark counting rule"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.10314","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}