期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.212003
关键词
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资金
- U.S. National Science Foundation
- Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
- French Centre National de la Recherche Scientifique (CNRS)
- French Commissariat a l'Energie Atomique (CEA)
- French-American Cultural Exchange (FACE)
- Italian Istituto Nazionale di Fisica Nucleare (INFN)
- National Research Foundation of Korea (NRF)
- Scottish Universities Physics Alliance (SUPA)
- United Kingdom's Science and Technology Facilities Council (STFC)
- French Agence Nationale de la Recherche [ANR-12-MONU-0008-01 PARTONS]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]
- Science and Technology Facilities Council [ST/G008582/1, ST/J000175/1, 1264251, ST/L005719/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1306153, 1305536, 1505615] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307340, 1205782] Funding Source: National Science Foundation
- STFC [ST/L005719/1, ST/J000175/1, ST/G008582/1] Funding Source: UKRI
Unpolarized and beam-polarized fourfold cross sections (d(4)sigma/dQ(2)dx(B)dtd phi) for the ep -> e'p'gamma reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 (Q(2), x(B), t) bins over the widest phase space ever explored in the valence-quark region. Several models of generalized parton distributions (GPDs) describe the data well at most of our kinematics. This increases our confidence that we understand the GPD H, expected to be the dominant contributor to these observables. Through a leading-twist extraction of Compton form factors, these results support the model predictions of a larger nucleon size at lower quark-momentum fraction x(B).
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