Publications
Publication Information
| Title | Exclusive photoproduction of $pi^0$ up to large values of Mandelstam variables $s, t$ and $u$ with CLAS |
| Authors | Michael Kunkel, Moskov Amaryan, Igor Strakovsky, James Ritman, G. Goldstein, Krishna Adhikari, Shankar Adhikari, Harutyun Avagyan, Jacques Ball, Ilaria Balossino, Luca Barion, Marco Battaglieri, V. Batourine, Ivan Bedlinskiy, Angela Biselli, Sergey Boyarinov, William Briscoe, William Brooks, Stephen Bueltmann, Volker Burkert, Frank Cao, Daniel Carman, Andrea Celentano, Gabriel Charles, Taya Chetry, GIUSEPPE CIULLO, L. Clark, Philip Cole, Marco Contalbrigo, Olga Cortes Becerra, Volker Crede, Annalisa D'Angelo, Natalya Dashyan, Raffaella De Vita, Enzo De Sanctis, Pavel Degtiarenko, Maxime Defurne, Alexandre Deur, Chaden Djalali, Michael Dugger, Raphael Dupre, Hovanes Egiyan, Ahmed El Alaoui, Lamiaa El Fassi, Latifa Elouadrhiri, Paul Eugenio, Gleb Fedotov, Robert Fersch, Alessandra Filippi, Ahmed Fradi, Gagik Gavalian, Yeranuhi Ghandilyan, Sudeep Ghosh, Gerard Gilfoyle, Kevin Giovanetti, Francois-Xavier Girod-Gard, Derek Glazier, Wesley Gohn, Evgeny Golovach, Ralf Gothe, Keith Griffioen, Lei Guo, Michel Guidal, Kawtar Hafidi, Hayk Hakobyan, Nathan Harrison, Mohammad Hattawy, Ken Hicks, Maurik Holtrop, Charles Hyde, David Ireland, Boris Ishkhanov, Evgeny Isupov, David Jenkins, Kyungseon Joo, Md. Latiful Kabir, Dustin Keller, Grigor Khachatryan, Mariana Khachatryan, Mahbub Khandaker, Andrey Kim, Wooyoung Kim, Andi Klein, Franz Klein, Valery Kubarovsky, Sebastian Kuhn, Jean-Marc Laget, Lucilla Lanza, Paolo Lenisa, Daniel Lersch, Kenneth Livingston, Ian MacGregor, Nikolay Markov, Georgie Mbianda Njencheu, Bryan McKinnon, Taisiya Mineeva, Viktor Mokeev, Rachel Montgomery, Aram Movsisyan, Carlos Munoz Camacho, Pawel Nadel-Turonski, Silvia Niccolai, Gabriel Niculescu, Mikhail Osipenko, Alexander Ostrovidov, Michael Paolone, K. Park, Eugene Pasyuk, David Payette, William Phelps, Oleg Pogorelko, Jiwan Poudel, John Price, Sebastien Procureur, Yelena Prok, Dan Protopopescu, Marco Ripani, Barry Ritchie, Alessandro Rizzo, Guenther Rosner, Ankhi Roy, Franck Sabatie, Carlos Salgado, Susan Schadmand, Reinhard Schumacher, Youri Sharabian, Iuliia Skorodumina, Daria Sokhan, Daniel Sober, Nikolaos Sparveris, Steffen Strauch, Mauro Taiuti, Joshua Artem Tan, Maurizio Ungaro, Hakob Voskanyan, Eric Voutier, Daniel Watts, Lawrence Weinstein, Xiangdong Wei, Dennis Weygand, Nicholas Zachariou, Jixie Zhang, Zhiwen Zhao |
| JLAB number | JLAB-PHY-18-2673 |
| LANL number | arXiv:1712.10314 |
| Other number | DOE/OR/23177-4403 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review C Volume 98 Issue 01 Page(s) 015207 Refereed | |
| Publication Abstract: | 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 prediction of $s^{-7} $. Paradoxically, the size of angular distribution of measured cross sections is greatly underestimated by the QCD based Generalized Parton Distribution mechanism at highest available invariant energy $s=11$ GeV$^2$. At the same time, the Regge exchange based models for $\pi^0$ photoproduction are more consistent with experimental data. |
| Experiment Numbers: | |
| Group: | Hall B |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevC.98.015207 |
| Accepted Manuscript: | PhysRevC.98-015207.pdf |
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