2015/02/22 by Vincenzo Minissale, Minissale, Vincenzo, Francesco Scardina +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.1502.06213
11 pages, 12 figures Added the figure and discussion about the proton/phi ratio, as in the accepted version for pubblication
openalex publication_date 2015/02/22 · arxiv created 2017/10/08 · arxiv updated 2017/10/10 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
In a coalescence plus independent fragmentation approach we calculate the pT spectra of the main hadrons: π, K, p, p, Λ, ϕ in a wide range of transverse momentum from low pT up to about 10 GeV. The approach in its main features was developed several years ago at 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 pT spectra from RHIC to LHC energy and in particular the baryon-to-meson ratios p/π, p/π,Λ/K that reach a value of the order of unit at pT ∼ 3 \rm GeV. This is achieved without any change of the coalescence parameters. The more recent availability of experimental data up to pT ∼ 10\rm GeV for Λ spectrum as well as for p/π and Λ/K shows some lack of yield in a limited pT range around 6 GeV. This indicates that the baryons pT spectra from AKK fragmentation functions are too flat at pT\lesssim 8 \rm GeV. We also show that in a coalescence plus fragmentation approach one predicts a nearly pT independent p/ϕ ratio up to pT ∼ 4 \rm GeV followed by a significant decrease at higher pT. Such a behavior is driven by a similar radial flow effect at pT< 2 \rm GeV and the dominance of fragmentation for ϕ at larger pT.