Search for aligned events in muon groups measured by BUST

A search for aligned events has been made throughout the muon groups events measured by the Baksan Underground Scintillation Telescope (BUST) during a period of 7.7 years. Only groups of multiplicity > 3 for muon threshold energy equal to 0.85 TeV were selected for the analysis. A distribution of the events on the alignment parameter λ has been obtained and compared with the results of Monte-Carlo simulations made for this experiment. An upper limit for aligned muon event flux as low as 5.3-bar 10-15cm-2sec-1sr-1 is given