The λ energy dependence deduced from Bose - Einstein correlations of ππ pairs produced in pp collisions

The energy dependence of the chaoticity parameter λ, derived from Bose-Einstein correlations (BEC) of pion-pairs produced in pp collisions, is investigated. Considered is the one dimension (1D) of the BEC analysis in terms of a Gaussian and / or exponential distributions. The experimental data are examined in terms of the relation between the pion sources and the BEC dimension R which in turn are deduced from the charged outgoing particle multiplicity. This approach follows the λ general energy behavior as obtained from the 1D BEC analyzes of the pp collision data. Prediction for the λ dependence on energy is obtained over a multi- TeV energy range based on a model of independent pion sources. The decrease of the λ value with energy expected within the framework of this approach is supported by the experimental findings.