1. Analysis Report
Haiyun Lu

2. Outline Introduction Detector Motivation Work needs to be done
Work already been done
To do
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3. Introduction g D-> K+ S*-(p)‏ g D-> K+ L (n)‏ g D-> K0 L (p)‏
Common form: g N-> K Y
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4. Introduction II S*- 1385 MeV I=1 Jp=3/2+ dds
87% L p- full width:39.4 MeV
L MeV
I=0 Jp=1/2+ uds
64% p p- mean life τ = × 10−10 s
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5. Jefferson Lab
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6. Detector
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7. Detector II
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8. Detector III
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9. Detector IV
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10. Detector V
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11. Accelerator
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12. Accelerator II
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13. Radiator and Tagger
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14. Motivation EG3 run Real photon beam: 1.15GeV – 5.5 GeV
Target: Deuteron
Trigger: three-sector triggering
Advantage:
neutron, high resonance state
Disadvantage:
few-particle final state
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15. Motivation II g D-> K+ S*-(p)‏ --->Lp- g D-> K0 L (p)‏
L->p p-
g D-> K+ L (n) for normalization reference and other physics
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16. Physics Motivation Hyperon self-analyzing property
N*->KY, search for “missing” states and KY coupling
Y* spectrum, constraint on SU(3) of decuplet baryons
KN coupling, comparison with pN
YN Final state interaction
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17. World Data
Ref. 1
PRL 102, (2009)‏
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18. Self Analyzing
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19. Parity
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20. Polarization
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21. Polarization II
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22. Cross Section
dN/dt=ls
N=Ls
s=N/L=
Y: yield
A: acceptance
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23. KS*- Final Particles: (P) (K+) P p- p- Middle-step particles:
L 1.115MeV
Final particle:
S* MeV
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24. Old Particle Identification
GeV
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GeV

25. Particle Identification
GeV
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GeV

26. Particle Identification II
GeV
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GeV

27. L Reconstruction
GeV
GeV
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28. L Reconstruction II
GeV
GeV
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29. Sigma VS Missing Mass
GeV
GeV
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30. Sigma VS Missing Mass II
GeV
GeV
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31. Sigma Yield Fit
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32. Sigma Yield Fit II
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33. Yield
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34. Trigger Correction
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35. Trigger Correction II
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36. GFlux Normalization
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37. GFlux Normalization II
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38. KL Production
Two cases:
K+L: K+ pp-
K0L: p+p- pp-
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39. K+L Production
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40. Fit and Yield
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41. Trigger & GFlux Correction
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42. K0L Production
GeV
GeV
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43. Fit and Yield
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44. Trigger & GFlux Correction
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45. Reference K. Hicks, etc. Phys. Rev. L 102, 012501 (2009)‏
Y. Oh, etc. Phys. Rev. C 77, (2008)‏
M. Do¨ring, etc. Phys. Rev. C 73, (2006)‏
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46. K*
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47. Work need to be done Get yield, acceptance, correction factor Cuts:
Timing cuts: vertex time cut, photon time cut, PID cut
Channel cuts: missing mass cut, invariant mass cut, yield fit range cut
Fiducial cuts: proton momentum cut, theta-phi cut for each particle, DC wire cut
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48. Work need to be done II Correction Factor:
tagger efficiency correction, un/trigger correction
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49. To do Run simulation to get acceptance
Steer the simulation to get correct t slope
Check all cuts and correction factor by showing histograms before and after correction
Compare simulation and data by showing pivot histograms
Get Cross section
Error propagation calculation
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