E01-012 : Spin-Duality Analysis update Patricia Solvignon Temple University, Philadelphia Hall A Collaboration Meeting, June 23-24, 2005.

E01-012 : Spin-DualityE01-012 : Spin-DualityAnalysis updateAnalysis update

Patricia Solvignon

Temple University, Philadelphia

Hall A Collaboration Meeting, June 23-24, 2005

June 23, 2005 P. Solvignon, Hall A Collab. Meeting

Hall C results

I. Niculescu et al., Phys. Rev. Lett. 85 (2000) 1182


Understand transition between partons and hadrons

Study of higher twists

Spin and flavor dependence of quark-hadron duality

Access high xbj region if duality is demonstrated and well understood

X. Zheng et al., Phys. Rev. Lett. 92 (2004) 012004


E94-010 saw a hint of duality in g1(3He)

Figure from Seonho Choi


Ran in January-February 2003

Inclusive experiment: 3He(e,e’)X

Measured polarized cross-sections differences and asymmetries

Form g1, g2, A1 and A2 for 3He

Spokepeople: N. Liyanage, J-P. Chen, Seonho ChoiGraduate Student: P. Solvignon

Test duality on the neutron SSF


(N+/ Q+ LT+)-(N-/ Q- LT-)A/ / ()

raw =

(N+/ Q+ LT+)+(N-/ Q- LT-)

Ncut Ntrial

oraw =

Ninc 3He det LT Nacc Ltarg p

Generate asymmetries and unpolarized cross sections


A/ / () exp

= A/ / () raw /(fN2

Ptarg Pbeam) oexp = o

raw - 2(N2

/ 3He)N

Apply correction for nitrogen dilution


A//()= //() / 2oborn

//() exp

= 2 A //()exp o

exp

//()= //() exp + R.C.

Form polarized cross section differences

Apply radiative corrections on //() and o


Density evaluated for each run

EPR analysis almost done

NMR analysis completed (V. Sulkosky)

Target

Cross sections and asymmetries Detector efficiencies done

Nitrogen dilution done

1st pass radiative corrections

Preliminary results on 3He spin structure functions


Pavg= 37%


Running with Duke

Running with Exodus


Agreement between left and right arms cross sections is at 2% level.


QFS model from J.W. Lightbody and J.S. O’Connell


Elastic tail negligeable at all our kinematics

For 1st pass, used QFS as model for o

Used E94-010 spin structure functions as a model for the radiative corrections on //() for our lowest energy

Then used our own data


N2 dilution applied

1st pass radiativecorrections

and


raw with both arms combined

exp= raw - N

N corrected for density ratio


Smoothed exp

After R.C., we obtain born


A// A

A1 = - D(1+ ) d(1+ )

(// + tan(/2) )

A// A

A2 = + D(1+ ) d(1+ )

MQ2 E 1g1 = 4e

2 E´ E +E´

MQ22 1g2 = 4e

2 2E´(E +E´)

(- // + E + E´ cos E´sin

)

(D and d depend of R)

Extract g1 and g2 directly from our data

Need external input of R to form A1 and A2


DIS fit : no Q2-evolution included here


Large negative contribution of (1232)


Still large negative contribution of (1232).But, at lower x, resonance data seem to oscillate around the DIS curve.


The (1232) disappears and the resonance data seems to approach the DIS behavior.


No resonance structure can be seen anymore.


DIS data on 3He


A1 is large and negative in the (1232) region.


A1 is still negative in the (1232) region.


The (1232) vanishes while the non-resonant background is rising. A1 becomes positive in the (1232) region.


The two highest Q2 data sets agree with each other and show the same trend as DIS data.



Finalize target analysis

2nd pass radiative corrections

Extract the neutron spin structure functions

Extract moments of structure functions (e.g. GDH sum rule, BC sum rule)

Final results expected by the end of 2005

Extra slidesExtra slides




E01-012 : Spin-Duality Analysis update Patricia Solvignon Temple University, Philadelphia Hall A Collaboration Meeting, June 23-24, 2005.

Documents

meeting slide

meeting n

data slide

born slide

meeting hall c results

philadelphia hall

meeting density

meeting e94