Freeze-out radii extracted from three-pion cumulants in pp, p-Pb and Pb-Pb collisions at the LHC
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G. and Zoccarato, Y. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
In high-energy collisions, the spatio-temporal size of the particle
production region can be measured using the Bose-Einstein correlations
of identical bosons at low relative momentum. The source radii are
typically extracted using two-pion correlations, and characterize the
system at the last stage of interaction, called kinetic freeze-out. In
low-multiplicity collisions, unlike in high-multiplicity collisions,
two-pion correlations are substantially altered by background
correlations, e. g. miini-jets. Such correlations can be suppressed using
three-pion cumulant correlations. We present the first measurements of
the size of the system at freeze-out extracted from three-pion cumulant
correlations in pp, p-Pb and Pb-Pb collisions at the LHC with ALICE. At
similar multiplicity, the invariant radii extracted in p-Pb collisions
are found to be 5-15\% larger than those in pp, while those in Pb-Pb are
35-55\% larger than those in p-Pb. Our measurements disfavor models
which incorporate substantially stronger collective expansion in p-Pb as
compared to pp collisions at similar multiplicity. (C) 2014 The Authors.
Published by Elsevier B.V. This is an open access article under the CC
BY license... Show more Show less