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Measurement of Charged Kaon Lifetime: Insights from the 2004 Experiment

This study presents the measurement of the charged kaon's lifetime based on data collected during a meeting on July 29, 2004. Utilizing two distinct methods, the research analyzes multiple families of kaon decays, yielding a lifetime measurement of ( T = 12.35 pm 0.04 , ns ). Efficiency assessments indicate a good vertex identification rate and significant associations between kaon tracks and daughter particles. The findings underscore the necessity of expanding the data sample for further systematic studies, integral to understanding particle decay mechanisms.

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Measurement of Charged Kaon Lifetime: Insights from the 2004 Experiment

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  1. Paolo Massarotti K charged meeting 29 July 2004 Charged kaon lifetime F. Ambrosino, P. De Simone, P. Massarotti, V. Patera.

  2. Measure ot T: length • Paolo Massarotti K charged meeting 29 July 2004

  3. Daughter P* with kaon mass hypothesis Background analisys • Four falimies: • good vertex (~ 69%) • kaon hits associated to daughter track (~ 20%) • Daughter hits associated to kaon track (~ 5%) • kaon broken track(~ 6%) Cut on 100 MeV Paolo Massarotti K charged meeting 29 July 2004

  4. Measure of T on MC aG = (101.2  0.6) x10-2 bG = (.15  .27) x10-3 MC true MC reco T+true = 12.37 ns c2 = 1.3 c2 = 0.6 T+MC = (12.35±0.08) ns T-MC = (12.37±0.11) ns Paolo Massarotti K charged meeting 29 July 2004

  5. We use neutral and charged vertex Measure of T: time g from p0 kaon Paolo Massarotti K charged meeting 29 July 2004

  6. daughter kaon • g on time Paolo Massarotti K charged meeting 29 July 2004 Neutral vertex efficiency • we look for a vertex with: • 1 g on time • P* < 220 MeV

  7. Paolo Massarotti K charged meeting 29 July 2004 Neutral vertex efficiency: MC true and reco aNV = (104.7  1.1) x10-2 bNV = (2.0  .43) x10-3 MC true MC reco

  8. Paolo Massarotti K charged meeting 29 July 2004 g from p0 recostruction efficiency aNV = (96.15  .7) x10-2 bNV = (.33  .03) x10-3

  9. Paolo Massarotti K charged meeting 29 July 2004 Contamination: d aNV = (1.7  0.3) x10-2 bNV = (.91 .11)x10-3 aNV = (2.6  0.3) x10-2 bNV = (.50  .12) x10-3 plus minus

  10. Paolo Massarotti K charged meeting 29 July 2004 Neutral and charged vertex efficiency: MC true and reco aNV CV = (106.3 .2) x10-2 bNV CV= (1.8  .8) x10-3

  11. Measure of T: MC T-MC = (12.38 ± 0.02) ns T+MC = (12.35 ± 0.04) ns Paolo Massarotti K charged meeting 29 July 2004

  12. Paolo Massarotti K charged meeting 29 July 2004 Conclusions • Two different methods to measure charged kaon lifetime have been implemented • The studies on systematics must be performed on a larger sample of data • Data have to be analyzed

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