STI Publications - View Publication Form #13574
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Publication Information
| Title | A precision measurement of the p(e,e'p)pi^0 reaction at threshold | ||||
| Abstract | New results are reported from an experiment to measure ?0 electroproduction at and above threshold using the p(e,e'p)pi^0 reaction. The experiment was designed to precisely determine the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the phi*_pi and theta*_pi angles in the ppi^0 center-of-mass was obtained for invariant energies above threshold from 0.5~MeV up to 15~MeV. The 4-momentum transfer Q2 coverage ranges from 0.05 to 0.155 (GeV/c)2 in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p?wave predictions from ChPT for Q2>0.07 (GeV/c)2, while the s-wave predictions are in reasonable agreement. | ||||
| Author(s) | Khem Chirapatpimol, Mitra Hashemi Shabestari, Richard Lindgren, Cole Smith, John Annand, Douglas Higinbotham, Bryan Moffit, Vladimir Nelyubin, Blaine Norum, Kalyan Allada, Konrad Aniol, Khamit Ardashev, Dave Armstrong, Dick Arndt, Fatiha Benmokhtar, Aron Bernstein, William Bertozzi, Bill Briscoe, Louis Bimbot, Alexandre Camsonne, Jian-Ping Chen, Seonho Choi, Eugene Chudakov, Evaristo Cisbani, Francesco Cusanno, Mark Macrae Dalton, Chiranjib Dutta, Kim Egiyan, Cesar FERNANDEZ RAMIREZ, Robert Feuerbach, Kevin Fissum, Salvatore Frullani, Franco Garibaldi, Olivier Gayou, Ronald Gilman, Shalev Gilad, Jose Goity, Javier Gomez, Brian Hahn, David Hamilton, Ole Hansen, Jia Huang, Ryuichi Igarashi, David Ireland, Kees De Jager, X. Jin, Xiaodong Jiang, Sudirukkuge Jinasundera, James D. Kellie, Cynthia (Thia) Keppel, Norm Kolb, John LeRose, Nilanga Liyanage, Kenneth Livingston, Dustin McNulty, Luis Mercado, Robert Michaels, Miha Mihovilovic, S. Qian, S. Mailyan, Vahe Mamyan, Stefano Marrone, Peter Monaghan, Sirish Nanda, Charles Perdrisat, Eliazer Piasetzky, Dan Protopopescu, Vina Punjabi, Yi Qiang, Igor Rachek, Abdurahim Rakhman, Guy Ron, Guenther Rosner, Arun Saha, Brad Sawatzky, Albert Shahinyan, Simon Sirca, Nikos Sparveris, Ramesh Subedi, Riad Suleiman, Vincent Sulkosky, Jose Udias Moinelo, Hakob Voskanyan, Kebin Wang, Yang Wang, John Watson, Daniel Watts, Bogdan Wojtsekhowski, Ron Workman, Huan Yao, Xiaohui Zhan, Yawei Zhang | ||||
| Publication Date | May 2015 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Exp Nuclear Physics / Experimental Halls / Hall A | ||||
| Funding Source | |||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E04-007
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| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review Letters |
| Refereed | Yes |
| Volume | 114 |
| Issue | 19 |
| Page(s) | 192503 |
Attachments/Datasets/DOI Link
| Document(s) |
1501.05607v3.pdf
(STI Document)
|
| DOI Link | |
| Dataset(s) | (none) |
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