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Motivations. Understand transition between partons and hadrons Study of higher twists Spin and flavor dependence of quark-hadron duality Access high x bj region if duality is demonstrated and well understood. Hint of duality. The E01-012 experiment.

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slide1

Motivations

  • 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

P. Solvignon, Duality Workshop

slide2

Hint of duality

P. Solvignon, Duality Workshop

slide3

The E01-012 experiment

Spokepeople:N. Liyanage, J-P. Chen, Seonho Choi

Graduate Student: P. Solvignon

  • Ran in January-February 2003
  • Inclusive experiment: 3He(e,e’)X
  • Measured polarized cross-sections differences and asymmetries
  • Form g1, g2, A1 andA2 for 3He
  • Test duality on the neutron SSF

P. Solvignon, Duality Workshop

slide4

The experimental setup

JLab HALL A

  • Polarized e- beam at 3, 4 and 5 GeV; Pavg =(773)%
  • Both HRS in symmetric config. at 25o and 32o: Double statistics  Control systematics
  • PID= Cerenkov + EM calo. /e reduced by 104(e-)>99%

P. Solvignon, Duality Workshop

slide5

Polarized 3He target

Spin exchange between optically pumped Rb and 3He

  • Longitudinal and transverse configurations
  • High luminosity: 1036 s-1 cm-2
  • 2 independent polarimetries: NMR and EPR

P. Solvignon, Duality Workshop

slide6

Data analysis

 - -

A//raw =  A raw= 

+ +

  • Generate asymmetries:
  • Measure unpolarized cross section:
  • Form polarized cross sections differences:
  • Can also get Born asymmetries:

oborn = oraw- 2(N2/3He)N + R.C.

//()raw = 2 A//()o

//() = //()raw + R.C.

A//()= //() / 2oborn

P. Solvignon, Duality Workshop

slide7

Polarized structure functions

Extract g1 and g2 directly from our data

MQ2 E 1

g1 =   

4e2 E´ E +E´

(//+ tan(/2) )

(- //+

MQ22 1

g2=  

4e2 2E´(E +E´)

E + E´ cos



E´sin

)

Need external input of R to form A1 and A2

A// A

A1 =  - 

D(1+) d(1+)

 A//A

A2 =  + 

D(1+) d(1+)

(D and d depend of R)

P. Solvignon, Duality Workshop

slide8

Elastic asymmetry

P. Solvignon, Duality Workshop

slide9

Asymmetries

P. Solvignon, Duality Workshop

slide10

Comparison of both HRS

P. Solvignon, Duality Workshop

slide11

Unpolarized cross sections

P. Solvignon, Duality Workshop

slide12

Polarized structure function g1

P. Solvignon, Duality Workshop

slide13

Polarized structure function g1

P. Solvignon, Duality Workshop

slide14

Polarized structure function g1

P. Solvignon, Duality Workshop

slide15

Polarized structure function g1

P. Solvignon, Duality Workshop

slide16

Polarized structure function g1

P. Solvignon, Duality Workshop

slide17

Spin asymmetry A1

P. Solvignon, Duality Workshop

slide18

Spin asymmetry A1

P. Solvignon, Duality Workshop

slide19

Spin asymmetry A1

P. Solvignon, Duality Workshop

slide20

Spin asymmetry A1

P. Solvignon, Duality Workshop

slide21

Spin asymmetry A1

P. Solvignon, Duality Workshop

slide22

Spin asymmetry A2

P. Solvignon, Duality Workshop

slide23

Conclusion

  • E01-012 provides precision data of SSF on neutron (3He) for 1.0 < Q2 < 4.0 (GeV/c) 2
  • Direct extraction of g1 andg2 from our data
  • Overlap between E01-012 resonance data and DIS test of Quark-hadron duality for neutron and nuclei SSF
  • E01-012 data combined with proton data  test of spin-flavor dependence of duality
  • Our data can also be used to extract moments of SSF (e.g. GDH sum rule, d2, BC sum rule)

P. Solvignon, Duality Workshop

slide24

Outlook

Extraction of the neutron SSF

Final results by the end of 2005

P. Solvignon, Duality Workshop

slide26

Polarized structure function g2

P. Solvignon, Duality Workshop

slide27

Spin asymmetry A1

P. Solvignon, Duality Workshop