1. Duality in Pion Electroproduction (E00-108) …
Duality in Pion Electroproduction (E00-108) …..Why does factorization appear to work well at low energies?
s ~
(Deuterium data)
PRL 98, (2007)
open (solid): with (without) diffractive r
D region
Should not depend on x
But should depend on z
Dashed lines: simple Parton Model prescription
assuming factorization
Resonances cancel (in SU(6)) in D-/D+ ratio
extracted from deuterium data

2. LO and NLO Pdf expectations
How Can We Verify Factorization? (E00-108)
Neglect sea quarks and assume no pt dependence to parton distribution functions
Fragmentation function dependence drops out in Leading Order
open (solid): with (without) diffractive r
No noticable pT-dependence in ratios
x = 0.32
z = 0.55
LO and NLO Pdf expectations
[sp(p+) + sp(p-)]/[sd(p+) + sd(p-)] [sp(p+) - sp(p-)]/[sd(p+) - sd(p-)]

3. Pion Transparency - Q2 Dependence (E01-107)
Inner error bar are
statistical uncertainties
outer error bar are the
quadrature sum of
statistical and pt. to pt.
systematic uncertainties.
With CT
No CT
CT + SRC
No CT + SRC
( Larson, Miller and Strikman, PRC 74, (2006)
( Cosyn, Martinez, Ryckebusch and Overmeire., PRC 74, R (2006)

4. Pion Transparency - A Dependence (E01-107)
Usually s (A) = s0 Aa
T = Aa-1 a
Fit of
T(A) = Aa-1
at fixed Q2
( Larson, Miller and Strikman, PRC 74, (2006)
( Cosyn, Ryckebusch et al., PRC 74, R (2006)

5. Scaling test in Pion Electroproduction (E01-107)
Hall C data at 6 GeV: 3 different experiments
One of the most stringent tests of factorization is the Q2 dependence of the π electroproduction cross section, σL scales to leading order as Q-6
The Q-6 QCD scaling law is consistent with the JLab σL data
Limited Q2 coverage and large uncertainties
Q2= GeV2
Q2= GeV2 σL σT

6. Precise Measurement of the EMC Effect in Light Nuclei (E03-103)
Goals:
Measure EMC Effect for:
3He - unmeasured at x > 0.4
4He - improve existing data by factor of ~2
Investigate “scaling” of the EMC Effect at large x, but W < 2 GeV
Compare “exact” calculations of light nuclei to data to improve our understanding of the contribution of conventional nuclear physics effects to the mass dependence of F2
3He
Preliminary Results
Analysis of 3He and 4He nearly complete; heavy target analysis still in progress (A. Daniel, Houston thesis )
3He ratio has significant correction due to “proton excess”
Shape independent of A, especially at large x(ξ)

7. G0 N-Delta Parity Violation (E04-104)
Elastic Region: G0
Inelastic Region: N D
Measurement: Parity-violating asymmetry of electrons scattered inelastically
ANΔ gives direct access to GANΔ
Directly measure the axial (intrinsic spin) response during N →Δ+ transition
Will find GANΔ over a range of Q2
0.05 GeV/c2 < Q2 < 0.5 GeV/c2.
First measurement in neutral current process
Data: Inelastic electrons measured by G0
Scattered from both LH2 and LD2, each at two energies (362MeV & 687MeV) IN
Status:
Data taking:
Completed March ‘07
First stage of corrections (backgrounds, detector efficiencies, etc):
In progress
Determination of Q2:
Coming soon
Asymmetry (ppm) vs Octant 687MeV)
OUT
Asymmetry (ppm)
BLINDED
Octant
Raw Asymmetry (averaged over inelastic region)

8. F2/R on Deuterium and nuclear targets ( E04-001 / E06-009)
Online cross sections!
Deuterium
Precision L/T separated structure functions F1, F2, FL, R
H, D, Al, C, Fe/Cu
Low Q2 ran January 2005
Moment extractions (compare to lattice predictions at Q2 = 4 GeV2)
Useful for neutrino MC input
Carbon