Abstract
We investigate femtoscopic ππ correlations using the UrQMD approach combined with a correlation afterburner. The dependence of ππ correlations on the charged particle multiplicity and formation time in p+p collisions at = 7 TeV is explored and compared to present ALICE data. The data allow us to constrain the formation time in the string fragmentation to τf ⩽ 0.8 fm/c.
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