Intriguing similarities of high- pT particle production between pp and A−A collisions

Abstract

In this paper we study the particle production at high transverse momentum (p T > 8 GeV/c) in both pp and Pb-Pb collisions at LHC energies. The characterization of the spectra is done using a power-law function and the resulting power-law exponent (n) is studied as a function of x T for minimum-bias pp collisions at different √ s. The functional form of n as a function of x T exhibits an approximate universal behavior. PYTHIA 8.212 reproduces the scaling properties and therefore, it is used to study the multiplicity-dependent particle production. Going from low to high multiplicities, the power-law exponent decreases. A similar behavior is also observed in heavy-ion collisions when one studies the centrality-dependent particle production. The interpretation of heavy-ion results requires the quantification of the impact of this correlation (multiplicity and high p T ) on jet-quenching observables.

A New Description of Transverse Momentum Spectra of Identified Particles Produced in Proton-Proton Collisions at High Energies

“…The relation (i) in terms of amount or portion is the same as or similar to the relation for multiplicity or transverse energy contributed by two sources [40]. This similarity reflects the law of universality existing in high energy collisions [44][45][46][47][48][49]. In fact, transverse momentum, multiplicity, and transverse energy reflect the amount of effective energy deposited in collisions [50,51].…”

Initial- and Final-State Temperatures of Emission Source from Differential Cross-Section in Squared Momentum Transfer in High-Energy Collisions

“…As mentioned in the first section and discussed above, some distributions applied in a large collision system can be also applied in a small collision system due to the universality, similarity, or common characteristics existing in highenergy collisions [27][28][29][30][31][32][33][34][35][36]. Based on the same reason, some statistical or hydrodynamic models applied in the large system should be also applied in the small system.…”

Excitation Function of Initial Temperature of Heavy Flavor Quarkonium Emission Source in High Energy Collisions

“…In fact, the spectra in the low-and high-p T regions represent similar trend in some cases. This is caused due to the similarity [35][36][37][38][39][40][41][42][43][44][45] which is widely existent in high energy collisions, where the similarity means the common or universality laws existed in different processes or collisions. In addition, one can revise Eq.…”