Kaon‐pion Ratio from ISR Results and the Derived Sea Level Muon Spectrum from MAEDA'S Model

Abstract

Kaon‐Pion‐Verhältnis nach ISR (CERN)‐Resultaten und reduziertes Myonspektrum nach MAEDA'S ModellVarious authors have estimated the production spectrum of particles in the nuclear interactions of primary protons with air nuclei. In general pions have been considered by them as the parents of muons and kaon contribution to muon flux is neglected.Recently THOMPSON and WHALLEY [1] have studied the data of AYRE et al. [2] on 2 × 105 muons above 20 GeV which provided the impetus for the authors to consider and include muons produced as the result of kaon decay along with muons produced from the decay of pions. Later DAU et al. [3] have calculated the production spectrum of muons using the experimental results of the Kiel Group (ALLKOFER et al. [4]) and MAEDA'S [5] model. It is found from their investigation that the calculated results are not in fair agreement with the observed data for vertical incidence of muons. The adopted value of the kaon‐pion ratio in their calculations was 15% which is somewhat higher than the value obtained from the machine measurements by the CERN Intersecting Storage Ring Group (ANTINUCCI et al. [6]).In the present work we have used the kaon‐pion ratio from the CERN ISR data and calculated the spectral shape of the sea level muon spectrum from MAEDA'S [5] model. The derived spectrum is fitted to the magnetic spectrograph data of the Kiel and Durham Groups [2, 4]. χ2‐test has been performed to obtain an idea about the significance of the fit with the measured data.