Simulation of the Transition Between Meson-System and QGP in a Transport Model

Abstract

Some thermodynamical properties of the interacting meson system and QGP at finite temperature are discussed. For a pure meson gas the Hagedorn limiting temperature is reproduced when the experimentally observed resonances are included. For QGP our results for different numbers of flavors Nf compare very well to the theoretical ones. A transport model based on the mean free path approach is used to simulate the evolution of the system. During the evolution we use the MIT bag model to perform the transition between meson gas and QGP.

Hadron formation from interaction among quarks

“…One can assign to each quark a momentum with constant magnitude but a random direction to keep the total momentum zero. Then let the quarks undergo a certain number (for example 1000) elastic collisions inside the spatial volume V with periodic boundary conditions used, as described in [6]. One can check that the momentum distribution obtained is like the one in Eq.(3).…”

Can a Higgs boson be produced at the LHC?

“…Now it is very straightforward to calculate the probability for producing Higgs bosons in pp collisions by comparing the local energy density in a collision with the minimum energy density ε H for Higgs production. Let ε(r) be the local energy density at the position where the relative distance between the colliding pair is r, the same definition as in the previous work [9][10][11]…”

“…Denote P (r) as the probability of the collising protons to reach the distance r without a collision. Inspired by the works [9][10][11], we build a simple model to simulate P (r) for proton-proton collision at the LHC. Normally the protons can participate in some interactions and generate new particles.…”

“…In Eq. ( 13), ρ = 2/(4/3πr 3 ) is the local particle number density defined the same way as in [9][10][11], and v is the relative velocity between the colliding protons.…”

The Novel Scaling of Tsallis Parameters from the Transverse Momentum Spectra of Charged Particles in Heavy-Ion Collisions

“…Some well-established models [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], such as AMPT, QGSJET II, HIJING, PACIAE, JAM, Hydrodynamic model, and the recombination model, are used to reproduce the transverse momentum spectra of particles and understand the dynamical evolution of the collision system and the relevant physics. Many other theoretical models have also been proposed to describe the transverse momentum spectra of particles, such as the blast-wave (BW) model [35], the Tsallis blast-wave model [36], the two-component model [37], and so on.…”