Speaker
Maciej Pawel Szymanski
(Warsaw University of Technology (PL))
Description
In heavy-ion collisions produced at the LHC two-particle correlations
of mesons and baryons carry important information about the emitting
source. At low relative momentum femtoscopic correlations arise, which
are sensitive to the homogeneity lengths of the system. Hydrodynamic
models predict that these will decrease with increasing transverse
mass of the pair. Such decrease is universally reported for pions,
also at the LHC. Kaons and baryons, having a much larger mass, allow
to significantly extend the range of measured m_T. The femtoscopic
results for heavier particles would put a strong constraint on such
predictions. Non-identical baryon and meson pairs are also sensitive
to emission asymmetries.
Femtoscopic correlations between baryons arise mostly due to
the strong interaction, which is not precisely known for some baryon
pair types. Most notable example is the lambda-lambda interaction
which has an unknown contribution due to the potential existence of
the H0 dibaryon. Equally interesting are baryon-antibaryon
potentials, which have a significant contribution from annihilation
channels. These processes may have an impact on single-particle
spectra, and should be investigated as one of the possible sources of
the small proton yield at the LHC.
We show the two-particle correlation functions for several pair types
(baryon-baryon, baryon-antibaryon and meson-meson), consisting of
neutral and charged kaons, protons and lambdas. Femtoscopic analysis
is carried out for them, taking into account, when necessary, residual
correlations and annihilation channels. Results are presented as a
function of transverse mass and event multiplicity, comparing with the
pp collisions results when possible. Correlations with lambdas are
analyzed both with femtoscopic methods as well as to study the unknown
interaction potentials.
Primary author
Collaboration ALICE
(CERN, Geneva, Switzerland)
Co-author
Maciej Pawel Szymanski
(Warsaw University of Technology (PL))
Peer reviewing
Paper
Paper files:
