Exclusive processes at JLab at 6 GeV [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 539 Modern physics
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2015
• Mô tả vật lý: Size: Article No. 02034 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268250
• Chủ đề: 1. 72 physics of elementary particles and fields; 2. Compton effect; 3. Electroproduction; 4. Exclusive interactions; 5. Gev range 01-10

Tóm tắt

 Deeply virtual exclusive reactions provide a unique opportunity to probe the complex internal structure of the nucleon. They allow to access information about the correlations between parton transverse spatial and longitudinal momentum distributions from experimental observables. Dedicated experiments to study Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP) have been carried out at Jefferson Lab using continuous electron beam with energies up to 6 GeV. Unpolarized cross sections, beam, target and double spin asymmetries have been measured for DVCS as well as for ?<
 sup>
 0<
 /sup>
  exclusive electroproduction. The data from Hall B provide a wide kinematic coverage with Q<
 sup>
 2<
 /sup>
 =1-4.5 GeV<
 sup>
 2<
 /sup>
 , x<
 sub>
 B<
 /sub>
 =0.1-0.5, and -t up to 2 GeV<
 sup>
 2<
 /sup>
 . Hall A data have limited kinematic range partially overlapping with Hall B kinematics but provide a high accuracy measurements. Scaling tests of the DVCS cross sections provide solid evidence of twist-2 dominance, which makes chiral-even GPDs accessible even at modest Q<
 sup>
 2<
 /sup>
 . We will discuss the interpretation of these data in terms of Generalized Parton Distributions (GPDs) model. Successful description of the recent CLAS ?<
 sup>
 0<
 /sup>
  exclusive production data within the framework of the GPD-based model provides a unique opportunity to access the chiral-odd GPDs.