Scaling laws for softened hadron production at LHC energies

Abstract

In this paper, we conduct a data-driven study of the production of softened hadrons and their contribution to the transverse momentum spectrum. To this end, we assume that the production of charged particles at soft and hard scales fundamentally results from the fragmentation of color strings. We analyze the $p_{\text{T}}$-spectrum data from pp to AA collisions at LHC energies reported by the ALICE Collaboration, finding that, in all cases, the data can be collapsed into a $p_{\text{T}}$-exponential trend in the range 1 GeV$<p_{\text{T}}<$6 GeV. With this insight, the description of the $p_{\text{T}}$-spectrum should contain information on the charged particle production coming from two different sources: fragmentation of color strings and collective phenomena that redistribute the transverse momentum and enhance the production of particles at intermediate $p_{\text{T}}$. We also found different relations between the effective temperature, multiplicity, and average $p_{\text{T}}$ for pp and AA collisions, indicating inherent dissimilarities between small and large colliding systems. In contrast, the contribution of the softened hadrons to the $p_{\text{T}}$-spectrum and average $p_{\text{T}}$ collapse onto scaling laws. Our results show that the physical mechanisms producing softened hadrons have similar origins for all colliding systems, revealing a stronger dependence on freeze-out parameters rather than the system size.

arXiv comment12 pages, 6 figures

References in corpus (37)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
• Energy loss in perturbative QCD
• Multiplicity Dependence of Pion, Kaon, Proton and Lambda Production in p-Pb Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Evidence for collectivity in pp collisions at the LHC
• Creating small circular, elliptical, and triangular droplets of quark-gluon plasma
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• High-p_T Charged Hadron Suppression in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at LHC energies
• Transverse momentum spectra of charged particles in proton-proton collisions at $\sqrt{s}=900$ GeV with ALICE at the LHC
• Transverse momentum spectra and nuclear modification factors of charged particles in pp, p-Pb and Pb-Pb collisions at the LHC
• Multiplicity dependence of light-flavor hadron production in pp collisions at $\sqrt{s}$ = 7 TeV
• Transverse momentum spectra and nuclear modification factors of charged particles in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV
• Recombination of shower partons in fragmentation processes
• Fluctuations of string tension and transverse mass distribution
• Multiplicity dependence of $\pi$, K, and p production in pp collisions at $\sqrt{s}=13$ TeV
• Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV
• Parton energy loss in an expanding quark-gluon plasma: Radiative vs collisional
• Effects of collective expansion on light cluster spectra in relativistic heavy ion collisions
• Thermal behavior and entanglement in Pb-Pb and p-p collisions
• Collective flow in high-multiplicity proton-proton collisions
• Multiplicity dependence of charged-particle production in pp, p-Pb, Xe-Xe and Pb-Pb collisions at the LHC
• Extended q-Gaussian and q-exponential distributions from Gamma random variables
• A generalized fluctuation relation for power-law distributions
• Soft and hard scales of the transverse momentum distribution in the Color String Percolation Model
• Entropy and Heat Capacity of the transverse momentum distribution for pp collisions at RHIC and LHC energies
• Effects produced by multi-parton interactions and color reconnection in small systems
• Radial flow afterburner for event generators and the baryon puzzle
• Nonextensivity and temperature fluctuations of the Higgs boson production

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