{"paper":{"title":"High Precision Measurement of the Proton Elastic Form Factor Ratio $\\mu_pG_E/G_M$ at low $Q^2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. J. Sarty, A. Rakhman, A. Saha, A. Shahinyan, B. E. Norum, B. Hahn, B. Moffit, B. Sawatzky, B. Wojtsekhowski, C. Dutta, C. W. de Jager, D. J. Margaziotis, D. Meekins, D. Protopopescu, D. S. Armstrong, D. W. Higinbotham, E. Chudakov, E. Cisbani, E. C. Schulte, E. Fuchey, E. Long, E. Piasetzky, F. Garibaldi, F. Itard, G. M. Huber, G. Ron, I. Pomerantz, I. Vilardi, J. Arrington, J. Glister, J. Huang, J. J. Lerose, J. Johnson, J. Katich, J.-O. Hansen, J.-P. Chen, J. Reinhold, K. Allada, K. Chirapatpimol, K. Hafidi, M. Olson, M. Shabestari, N. F. Sparveris, P. Decowski, P. E. Reimer, P. Solvignon, R. De Leo, R. D. Ransome, R. Gilman, R. J. Holt, R. Lindgren, R. Michaels, R. Subedi, S. Choi, S. Frullani, S. Gilad, S. May-Tal Beck, S. Riordan, S. Sirca, S. Strauch, T. Holmstrom, V. Sulkosky, W. Bertozzi, W. Boeglin, X. Jiang, X. Qian, X. Zhan, Y. Qiang, Y. Wang, Y. Zhang, Z. Ye","submitted_at":"2011-02-01T23:09:16Z","abstract_excerpt":"We report a new, high-precision measurement of the proton elastic form factor ratio \\mu_p G_E/G_M for the four-momentum transfer squared Q^2 = 0.3-0.7 (GeV/c)^2. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio \\mu_p G_E/G_M from unity observed in previous polarization measurements at high Q^2 continues down to the lowest Q^2 value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor rough"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.0318","kind":"arxiv","version":2},"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"}