The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

Abstract

A detailed study of pion production in central Mg-Mg collisions at a momentum of 4.3 GeV/c per incident nucleon was carried out with use of the setup GIBS. The average kinematical characteristics of pions (multiplicity n − , momentum P , transverse momentum P T , emission angle Θ, rapidity Y ) and corresponding distributions have been obtained. The experimental results have been compared with the predictions of the Quark Gluon String Model (QGSM) and satisfactory agreement between the experimental data and the model has been found. The QGSM reproduces also the dependence of average P T on n − .The temperatures of π − mesons have been estimated in the rapidity interval of 0.5≤Y≤2.1. A satisfactory fit for π − mesons had been achieved by using a form involving two temperatures T 1 and T 2 . It was found that the QGSM underestimates T 2 by (10 − 15)%. The data have been analyzed using the transverse momentum technique. The observed dependence of the < P x ′ (Y ) > on Y shows the S-shape behaviour. The slope at midrapidity F has been determined. The QGSM reproduces the < P x > distribution satisfactorily, but underestimates the parameter F . PACS

Phenomenological analysis of rapidity distribution of negative pions in central 12C+12C collisions at $\sqrt{s_{nn}} = 3.14\, {\rm GeV}$

“…Analysis of pion rapidity distribution showed that the central rapidity region was occupied with pions of significantly larger transverse momentum as compared to the fragmentation region of interacting nuclei. 22 The rapidity distributions of negative pions in (p, d, α, C)+ C and (d, α, C)+ Ta collisions at 4.2A GeV/c were analyzed in different transverse momentum intervals of π − in Refs. 20 and 21.…”

“…12,[17][18][19][20][21][22] The momentum, transverse momentum and rapidity distributions of the negative pions produced in Mg+Mg collisions at 4.3 GeV/c per nucleon were analyzed in Ref. 22. Analysis of pion rapidity distribution showed that the central rapidity region was occupied with pions of significantly larger transverse momentum as compared to the fragmentation region of interacting nuclei.…”

“…4,15,16 Information about the state of excited and compressed nuclear matter, produced in relativistic nucleus-nucleus collisions, like collision dynamics and particle production mechanism could be extracted from analysis of the centrality dependence of the rapidity and transverse momentum spectra of pions. 12,[17][18][19][20][21][22] The momentum, transverse momentum and rapidity distributions of the negative pions produced in Mg+Mg collisions at 4.3 GeV/c per nucleon were analyzed in Ref. 22.…”

Analysis of rapidity spectra of negative pions ind + 12C,12C + Olimov1, Iqbal2, Glagolev3 et al. 2013Phys. Rev. C13000View full textAdd to dashboardCite

“…Information about the state of excited or/and compressed nuclear matter created in relativistic nucleus-nucleus collisions, collision dynamics, and the particle production mechanism could be extracted from the analysis of the collision centrality dependence of the rapidity and transverse momentum spectra of pions [10,[22][23][24][25]. The momentum, transverse momentum, and rapidity distributions of negative pions produced in Mg + Mg collisions at 4.3 GeV/c per nucleon were analyzed in Ref.…”

Partial inelasticity coefficients of negative pions in p, d, α, 12C+12C and p, 12C+181Ta collisions at 4.2 GeV/c per nucleon

“…Hence investigation of the various properties of pions, produced in relativistic nuclear collisions, is important for understanding the dynamics of a nuclear collision and to unravel the state of a highly compressed nuclear matter created in central collisions. [1][2][3][4][5][6][7][8] Inelasticity coefficients, being the averaged characteristics of nuclear collisions, contain useful information about an energy transferred from an impinging hadron or projectile nucleus to the produced particles. In practice, one deals with a partial inelasticity coefficient measured for a given type of particles, produced in nuclear collisions.…”