Inhaltszusammenfassung

The decay $K^{+} rightarrow pi^{+}nuoverline{nu}$ with a very precisely predicted branching ratio of $8.4times 10^{-10}$ is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the $K^{+} rightarrow pi^{+}nuoverline{nu}$ decay with a decay-in-flight technique, novel for this channel. The search for the $K^{+} rightarrow pi^{+}nuoverline{nu}$ decay is presented in t...The decay $K^{+} rightarrow pi^{+}nuoverline{nu}$ with a very precisely predicted branching ratio of $8.4times 10^{-10}$ is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the $K^{+} rightarrow pi^{+}nuoverline{nu}$ decay with a decay-in-flight technique, novel for this channel. The search for the $K^{+} rightarrow pi^{+}nuoverline{nu}$ decay is presented in this thesis, based on a sample of about $10^{11}$ $K^+$ decays collected in 2016 by the NA62 experiment. The Single Event Sensitivity is found to be $3times 10^{-10}$ corresponding to about 0.26 $K^{+} rightarrow pi^{+}nuoverline{nu}$̄ and 0.15 background events expected. The analysis has revealed one candidate event compatible with the expectations. Interpreting the candidate as background leads to a 95$%$ CL upper limit of $1.4times10^{-9}$ on the $K^{+} rightarrow pi^{+}nuoverline{nu}$ branching ratio. Prospects for future developments are also reviewed.» weiterlesen» einklappen

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DDC Sachgruppe:
Physik