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Дата последнего поиска статьи во внешних источниках: 9 апреля 2015 г.
Аннотация:The hypothesis previously put forth in the literature that alignment of spots on films that is observed in cosmic-ray emulsion experiments is related to a predominant jet character of events at ultrahigh energies is verified. The Monte Carlo PYTHIA generator, which is known to have provided good results in describing jet events in hadron-hadron interactions, is used in the present analysis. Because of a strong correlation between the directions of jet axes and particle momenta (collinearity) in them, the estimated degree of alignment of spots in jet events is substantially higher than that in a random sample of spots disposed chaotically on an x-ray film. For primary-interaction altitudes and collision energies satisfying some specific constraints, the degree of alignment appears to be strongly dependent on the hardness of the process and on the threshold for the total energy of selected clusters, increasing as they grow.