In a coalescence plus independent fragmentation approach we calculate the p(T) spectra of the main hadrons: pi, K, p, (p) over bar, Lambda, phi in a wide range of transverse momentum from low p(T) up to about 10 GeV. The approach in its main features was developed several years ago at Relativistic Heavy Ion Collider (RHIC) energy. Augmenting the model with the inclusion of some more main resonance decays, we show that the approach correctly predicts the evolution of the p(T) spectra from RHIC to LHC ( Large Hadron Collider) energy and in particular the baryon-to-meson ratios p/pi, (p) over bar/pi, Lambda/K that reach a value of the order of unit at p(T) similar to 3 GeV. This is achieved without any change of the coalescence parameters. The more recent availability of experimental data up to p(T) similar to 10 GeV for Lambda spectrum as well as for p/pi and Lambda/K shows some lack of yield in a limited p(T) range around 6 GeV. This indicates that the baryons p(T) spectra from Albino-Kniehl-Kramer fragmentation functions are too flat at p(T) less than or similar to 8 GeV. We also show that in a coalescence plus fragmentation approach one predicts a nearly p(T) independent p/phi ratio up to p(T) similar to 4 GeV followed by a significant decrease at higher p(T). Such a behavior is driven by a similar radial flow effect at p(T) < 2 GeV and the dominance of fragmentation for phi at larger p(T)

Hadrons from coalescence plus fragmentation in AA collisions at energies available at the BNL Relativistic Heavy Ion Collider to the CERN Large Hadron Collider

Minissale V;GRECO, VINCENZO
2015-01-01

Abstract

In a coalescence plus independent fragmentation approach we calculate the p(T) spectra of the main hadrons: pi, K, p, (p) over bar, Lambda, phi in a wide range of transverse momentum from low p(T) up to about 10 GeV. The approach in its main features was developed several years ago at Relativistic Heavy Ion Collider (RHIC) energy. Augmenting the model with the inclusion of some more main resonance decays, we show that the approach correctly predicts the evolution of the p(T) spectra from RHIC to LHC ( Large Hadron Collider) energy and in particular the baryon-to-meson ratios p/pi, (p) over bar/pi, Lambda/K that reach a value of the order of unit at p(T) similar to 3 GeV. This is achieved without any change of the coalescence parameters. The more recent availability of experimental data up to p(T) similar to 10 GeV for Lambda spectrum as well as for p/pi and Lambda/K shows some lack of yield in a limited p(T) range around 6 GeV. This indicates that the baryons p(T) spectra from Albino-Kniehl-Kramer fragmentation functions are too flat at p(T) less than or similar to 8 GeV. We also show that in a coalescence plus fragmentation approach one predicts a nearly p(T) independent p/phi ratio up to p(T) similar to 4 GeV followed by a significant decrease at higher p(T). Such a behavior is driven by a similar radial flow effect at p(T) < 2 GeV and the dominance of fragmentation for phi at larger p(T)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/37154
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