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Particle Identification and Missing Mass Analyses in Kaon Physics Experiment

Study on proton, pion, and kaon identification using beta and momentum cuts, addressing misidentifications and timing issues. Analysis of Missing Mass Plots to identify Lambdas and distinguish kaons, supported by polarization observables. Preliminary findings show qualitative agreement with SAID data.

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Particle Identification and Missing Mass Analyses in Kaon Physics Experiment

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  1. Liam Casey Catholic University of America Adviser: Dr. Franz Klein FROST: Status of gp -> K+L analysis

  2. Particle Identification • Protons, pions, and kaons are identified by beta and momentum cuts. • Kaon region may overlap with misidentified protons and pions. • Bad timing information may also give false kaon identification at low momentum.

  3. Missing Mass Plots: Finding L

  4. Missing Mass Plots: Finding L (cont)

  5. Momentum plotted against Missing Mass (1) • In the lower energy regions, a L signal is visible when missing mass is plotted. • There is additionally a peculiar sloping line passing through the signal region, which most likely indicates misidentified kaons.

  6. Momentum plotted against Missing Mass (2) • The L signal fades for higher photon energies, while the sloping line remains.

  7. Polarization Observable E: Comparison to Model Predictions (2.478 GeV Beam) • Appears to show some level of agreement with SAID data. • Higher cos q bins are more suspect due to high background contamination. • For full asymmetry, Ptarg ~ 0.8, Pel ~ 0.85 are taken as averages.

  8. Polarization Observable E: More Energy ranges (2.478 GeV Beam)

  9. Conclusions and Further Work • All results are extremely preliminary, but first measurements of E indicate some qualitative agreement with SAID PWA in more trustworthy regions (those not dominated by heavy background). • Energy loss corrections need to be added without losing all the lambdas. • Background subtraction • Measurements of other polarization observables

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