Chirapatpimol, K,Shabestari, M. H.Lindgren, R. A.Fernández Ramírez, César2024-12-092024-12-092015-05-13Chirapatpimol, K & Shabestari, M & Lindgren, Richard & Smith, L & Annand, (et al) (2015). Precision Measurement of the p(e,e′p)π0 Reaction at Threshold. Physical review letters. 114. 192503.1079-7114, 0031-9007https://doi.org/10.1103/PhysRevLett.114.192503https://hdl.handle.net/20.500.14468/24747This is an Accepted Manuscript of an article published by American Physical Society in " Physical Review Letters 114(19)", available at: https://doi.org/10.1103/PhysRevLett.114.192503Este es el manuscrito aceptado del artículo publicado por American Physical Society en "Physical Review Letters 114(19)", disponible en línea: https://doi.org/10.1103/PhysRevLett.114.192503New results are reported from a measurement of 𝜋0 electroproduction near threshold using the 𝑝⁡(𝑒,𝑒′⁢𝑝)⁢𝜋0 reaction. The experiment was designed to determine precisely 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 𝜙*𝜋 and 𝜃*𝜋 angles in the 𝑝⁢𝜋0 center of mass was obtained for invariant energies above threshold from 0.5 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.eninfo:eu-repo/semantics/openAccessartículo