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Title: Exclusive processes at JLab at 6 GeV

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 π0 exclusive electroproduction. The data from Hall B provide a wide kinematic coverage with Q2=1-4.5 GeV2, xB=0.1-0.5, and -t up to 2 GeV2. 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 Q2. We will discuss the interpretation of these data in terms of Generalized Parton Distributions (GPDs) model. Successful description of the recent CLAS π0 exclusive production data within the framework of the GPD-based model provides a unique opportunity to access the chiral-odd GPDs.
Authors:
 [1]
  1. Univ. of Connecticut, Storrs, CT (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1168724
Report Number(s):
JLAB-PHY--14-1992; DOE/OR/23177--3281
TRN: US1600043
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: 4. International Workshop on Transverse Polarization Phenomena in Hard Processes (TRANSVERSITY 2014), Chia (Italy), 9-13 Jun 2014; Related Information: EPJ Web of Conferences, 85
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; EXCLUSIVE INTERACTIONS; GEV RANGE 01-10; COMPTON EFFECT; ELECTROPRODUCTION; NUCLEONS; CHIRALITY; CROSS SECTIONS; PIONS NEUTRAL; TRANSVERSE MOMENTUM; LONGITUDINAL MOMENTUM; DISTRIBUTION FUNCTIONS; SPIN; ASYMMETRY; CORRELATIONS; SCALING LAWS; DEEP INELASTIC SCATTERING; PARTICLE STRUCTURE; QUARKS; GLUONS; STRUCTURE FUNCTIONS