Upper Limit on the Prompt Muon Flux Derived from the LVD Underground Experiment
arXiv:hep-ex/9906021 · doi:10.1103/PhysRevD.60.112001
Abstract
We present the analysis of the muon events with all muon multiplicities collected during 21804 hours of operation of the first LVD tower. The measured depth-angular distribution of muon intensities has been used to obtain the normalization factor, A, the power index, gamma, of the primary all-nucleon spectrum and the ratio, R_c, of prompt muon flux to that of pi-mesons - the main parameters which determine the spectrum of cosmic ray muons at the sea level. The value of gamma = 2.77 +/- 0.05 (68% C.L.) and R_c < 2.0 x 10^-3 (95% C.L.) have been obtained. The upper limit to the prompt muon flux favours the models of charm production based on QGSM and the dual parton model.
10 pages, 4 figures, RevTex. To appear in Phys. Rev. D
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