Leading twist nuclear shadowing, nuclear generalized parton distributions and nuclear DVCS at small x

Journal Article · Thu Jan 01 04:00:00 EST 2009 · European Physical Journal C

OSTI ID:956301

Guzey, Vadim; Goeke, Klaus; Siddikov, Marat

We generalize the leading twist theory of nuclear shadowing and calculate quark and gluon generalized parton distributions (GPDs) of spinless nuclei. We predict very large nuclear shadowing for nuclear GPDs. In the limit of the purely transverse momentum transfer, our nuclear GPDs become impact parameter dependent nuclear parton distributions (PDFs). Nuclear shadowing induces non-trivial correlations between the impact parameter $$b$$ and the light-cone fraction $$x$$. We make predictions for the deeply virtual Compton scattering (DVCS) amplitude and the DVCS cross section on $$^{208}$$Pb at high energies. We calculate the cross section of the Bethe-Heitler (BH) process and address the issue of the extraction of the DVCS signal from the $$e A \to e \gamma A$$ cross section. We find that the $$e A \to e \gamma A$$ differential cross section is dominated by DVCS at the momentum transfer $$t$$ near the minima of the nuclear form factor. We also find that nuclear shadowing leads

• Research Organization: Thomas Jefferson Lab National Accelerator Facility
• Sponsoring Organization: USDOE
• OSTI ID: 956301
• Report Number(s): JLAB-THY-09-941; arXiv:0901.4711; DOE-OR-23177-0618
• Journal Information: European Physical Journal C, Journal Name: European Physical Journal C
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COMPTON EFFECT
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
FORM FACTORS
GLUONS
IMPACT PARAMETER
MOMENTUM TRANSFER
NUCLEI
QUARKS
TRANSVERSE MOMENTUM