Strangeness in Quark Matter 2017

Strange and heavy hadrons production from coalescence plus fragmentation in AA collisions at RHIC and LHC

13 Jul 2017, 11:10

20m

BBG 169

oral presentation Strangeness production at low baryon densities Parallel Strangeness

Speakers

Salvatore Plumari (University of Catania (Italy)) Vincenzo Greco (University of Catania) Francesco Scardina (INFN Catania)

Description

We study the ${\mathrm{\Lambda }}_c/D$ ratio and $p/\varphi$ at RHIC and LHC within a realistic implementation of coalescence model.
The evolution of the partonic stage is described by the relativistic Boltzmann equation tuned at a fixed shear-viscosity to entropy-density ratio $\eta /s$ and a realistic equation of state.
Such an approach recovers the universal features of the ideal hydrodynamics.
In a coalescence plus independent fragmentation approach we calculate the $p_T$ spectra and anisotropic flows $v_n$ of the main hadrons:
$\pi ,K,p,\overline{p},\mathrm{\Lambda },D,{\mathrm{\Lambda }}_c,\varphi$ in a wide range of transverse momentum. Our approach correctly describes the
baryon-to-meson ratios $p/\pi ,\overline{p}/\pi ,\mathrm{\Lambda }/K$ that reach a value of the order of unit at $p_T\sim 3GeV$.
In particular we show that in a coalescence plus fragmentation approach one predicts a nearly $p_T$ independent $p/\varphi$ ratio up to $p_T\sim 4GeV$ followed by a significant decrease at higher $p_T$ . Such a behavior is
driven by a similar radial flow effect at $p_T<2GeV$ and the dominance of fragmentation for $\varphi$ at larger $p_T$.
Moreover in the same framework we evaluate the ${\mathrm{\Lambda }}_c/D$ ratio at RHIC and LHC finding a substantial enhancement with respect to $pp$ collisions.

[1] S. Plumari, G. L. Guardo, F. Scardina, V. Greco, Phys.Rev. C92 (2015) no.5, 054902.

[2] S. Plumari, G. L. Guardo, V. Greco, J.-Y. Ollitrault, Nucl.Phys. A941 (2015) 87-96.

[3] V. Minissale, F. Scardina, V. Greco, Phys.Rev. C92 (2015) no.5, 054904.

[4] S. K. Das, J. M. Torres-Rincon, L. Tolos, V. Minissale, F. Scardina, V. Greco, Phys.Rev. D94 (2016) no.11, 114039.

Presentation materials

PLUMARI_SQM2017_COAL.pdf

Peer reviewing

Paper

Accepted on 2 Nov 2017 by Andre Mischke

Paper files:

• LICENSE_PLUMARI_SQM2017_COALESCENCE.pdf
• PLUMARI_SQM2017_COALESCENCE.pdf