Unitary constraints on Deeply Virtual Compton Scattering

Journal Article · Thu Nov 01 04:00:00 EDT 2007 · Phys.Rev.C

DOI:https://doi.org/10.1103/PhysRevC.76.052201· OSTI ID:910929

Laget, J M

At moderately low momentum transfer ($-t$ up to 1 GeV$^2$) the coupling to the vector meson production channels gives the dominant contribution to real Compton and deeply virtual Compton scattering (DVCS). Starting from a Regge Pole approach that successfully describes vector meson production, the singular part of the corresponding box diagrams (where the intermediate vector meson-baryon pair propagates on-shell) is evaluated without any further assumptions (unitarity). Such a treatment explains not only the unexpectedly large DVCS unpolarized cross section that has been recently measured at Jefferson Laboratory (JLab), but also all the beam spin and charge asymmetries that has been measured at JLab and Hermes, without explicit need of Generalized Parton Distributions (GPD). The issue of the relationship between the two approaches is addressed.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 910929
• Report Number(s): JLAB-THY-07-702; DOE/OR/23177-0111
• Journal Information: Phys.Rev.C, Journal Name: Phys.Rev.C Vol. 76
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPTON EFFECT
CROSS SECTIONS
MOMENTUM TRANSFER
PRODUCTION
REGGE POLES
SPIN
UNITARITY
VECTOR MESONS
VECTORS