K Electroproduction off the proton

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SoN Meeting


Feb. 7, 2004

• K Electroproduction off the proton
• And
• The Search for Missing Resonances
• via

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OUTLINE

• Motivation
• Experiment
• Data Analysis
• Results
• Conclusion

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Motivation and Objectives

• Motivation Quark Models predict missing
  resonances
• They could be observed via ep and p
  interactions.
• Nucleon resonances could couple strongly to K
  and K
• Objectives
• Measuring cross-sections for the K production
  via analyzing
• 
  E 4.056 and 4.427 GeV
• Search for missing resonances!

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ExperimentK Electroproduction off the proton

• 
  (Y) b.g
• The reaction of interest b.g channel (
  production)
• The reaction of
  

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Data Analysis and Cuts

• Pre-Analysis Data Reduction
• Cooking (raw data cooked data) track
  reconstruction
• 
  ID of e and other
  particles
• Skimming Kaon filter (ve charge with 0.3lt
  lt0.7 GeV) and ID.
• Setting Flags
• Data Analysis and cuts
• Kinematic cuts on W, , and z-vertex as
  well as Fiducial cuts.
• Identification (mom-dep. cut)
• Pion mass cuts
• Channel Identification/Background cuts

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Z-vertex position of the target (in cm). In the
3rd column both kinematic and mass cuts are
applied
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Channel Identification/Background Cuts

• Mass Cuts
• K inv. Mass cuts
• K Missing mass cuts
• From the 4-mom of the K decays
• and the reaction of interest.
• Background Cuts
• Pions b.g. (Misidentified pions)
• Channel background
• Lam Production
• From higher Y resonances

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Background

• Channel b.g ( production)
• From production

• Pion b.g ( events)

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Kinematic Coverage
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Final Peaks
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Cross-sections

• Calculated from the peak

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MC Simulations
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Results and Conclusions