Freeze-out radii extracted from three-pion cumulants in pp, p–Pb and Pb–Pb collisions at the LHC - INSPIRE

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Freeze-out radii extracted from three-pion cumulants in pp, p–Pb and Pb–Pb collisions at the LHC

ALICE

Collaboration

Apr 4, 2014

13 pages

Published in:

Phys.Lett.B 739 (2014) 139-151

Published: Dec 12, 2014

e-Print:

1404.1194 [nucl-ex]

DOI:

10.1016/j.physletb.2014.10.034

Report number:

CERN-PH-EP-2014-062,
ALICE-PUBLIC-2014-003

Experiments:

CERN-LHC-ALICE

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Abstract: (Elsevier)

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. mini-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.

Note:

25 pages, 6 captioned figures, 1 table, authors from page 19, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1056

correlation function: two-pion
heavy ion: scattering
correlation: Bose-Einstein
background
freeze-out: kinetic
p p: scattering
CERN LHC Coll
charged particle: multiplicity
ALICE
multiplicity: dependence

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Figures(0)

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