Speaker
Shiori Takeuchi
(Sophia Univ)
Description
We study effects of hadronic rescattering on final observables for
multi-strange hadrons in high-energy nuclear collisions within an
integrated dynamical model. We simulate the whole collision process on
an event-by-event basis by using a fully (3+1)-dimensional ideal
hydrodynamic description for the quark gluon plasma (QGP) and a
subsequent kinetic transport description for the hadron resonance gas.
The QGP created in a collision expands, cools down and then turns into
hadron gas. In the last stage of the collisions, hadrons continue to
scatter with each other. Therefore observed hadron spectra are, in
general, contaminated by the hadronic rescatterings. In order to probe
the QGP more directly, multi-strange hadrons, in particular $\phi$-meson
and $\Omega$-baryon, can be utilized since multi-strange hadrons have
small scattering cross-sections and less scatter with non-strange
hadrons. Thus final observables of $\phi$-mesons and $\Omega$-baryons
are expected to reflect the properties of the system just after
hadronization.
Some years ago, violation of mass ordering in $v_2(p_{\rm T})$ was
predicted by using a hydro + cascade hybrid model and thereafter
observed by the STAR collaboration. Following this work, we scrutinize
multi-strange hadron spectra at both RHIC and LHC energies by using a
more sophisticated integrated dynamical model towards comprehensive
understanding of this phenomenon. In addition to $v_2(p_{\rm T})$, we
investigate the hadronic rescattering effects on mean transverse momenta
($\langle p_{\rm T} \rangle$) and $p_{\rm T}$-averaged $v_2$ of hadrons
including heavier multi-strange hadrons such as $\Xi$- and
$\Omega$-baryons. We also discuss the collision energy dependence of the
hadronic rescattering effects on the violation of mass ordering behavior
and show that multi-strange hadrons can be used as “penetrating probes”
of the QGP.
| On behalf of collaboration: | NONE |
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Primary authors
Shiori Takeuchi
(Sophia Univ)
Tetsufumi Hirano
(Sophia Univ)
Co-authors
Koichi Murase
(The University of Tokyo)
Pasi Huovinen
(Goethe-Universität)
Yasushi Nara
(Akita International University)
