Speakers
Vincenzo Greco
(University of Catania)
francesco scardina
(University of Catania, INFN - LNS)
Description
In a coalescence plus independent fragmentation approach we calculate the $p_T$ spectra of the main hadrons $\pi,K, p, \bar p, \Lambda, \phi$ in a wide range of transverse momentum from low
$p_T$ up to about 10 GeV.
We show that the approach correctly predicts the evolution of the $p_T$ spectra from RHIC to LHC energy and in particular the baryon-to-meson ratios $p/\pi, \bar p/\pi, \Lambda/K$ that reach a peak value of the order of unit at $p_T \sim 3$ GeV, while $p/\phi $ remains nearly constant showing the mass against the quark number effect in the coalescence process.
Recombination of minijet partons with the partons from the QGP is also included and plays a
role at $p_T \sim 2 − 5$ GeV where the baryon to meson anomaly is observed experimentally.
The more recent availability of experimental data up to $p_T \sim 10$ GeV for the spectra as well as for $p/\pi$, $\bar p/\pi$, $\Lambda/K$ ratios allows to spot some lack of yield in a limited $p_T$ range around 6 GeV.
Finally, we discuss also the origin of a significant breaking of the quark number scaling of the elliptic flow $v_2$.
Reference
[1] V. Minissale, F. Scardina and V. Greco,
``Hadrons from Coalescence plus Fragmentation in AA collisions from RHIC to LHC energy,'' arXiv:1502.06213 [nucl-th], to be published in Phys. Rev. C (2015).
Authors
Vincenzo Greco
(University of Catania)
francesco scardina
(University of Catania, INFN - LNS)
Co-author
Vincenzo Minissale
(University of Catania, INFN-LNS)
