Exclusive processes at JLab at 6 GeV

Conference · Thu Jan 01 00:00:00 EST 2015

DOI:https://doi.org/10.1051/epjconf/20158502034· OSTI ID:1168724

Kim, Andrey ^[1]

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1. Univ. of Connecticut, Storrs, CT (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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, x_B=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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1168724
• Report Number(s): JLAB-PHY-14-1992; DOE/OR/23177-3281; TRN: US1600043
• 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
• Country of Publication: United States
• Language: English

Related Subjects

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