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Particle productions in $p\bar{p}$ collisions in the PACIAE 4.0 model

Z. Xie, A. K. Lei, H. Zheng, W. C. Zhang, D. M. Zhou, Z. L. She, Y. L. Yan, B. H. Sa

Abstract

We investigate the particle production in proton-antiproton ($p\bar{p}$) collisions using the PACIAE 4.0 model. The pseudorapidity density distributions ($dN_{\text{ch}}/dη$) and transverse momentum ($p_T$) spectra of charged particles from nonsingle diffractive (NSD) $p\bar{p}$ collisions agree well with the experimental data when using model parameters previously determined from nonsingle diffractive proton-proton ($pp$) collisions. Furthermore, we systematically compare results from both inelastic (INEL) and nonsingle diffractive $p\bar{p}$ and $pp$ collisions at the same energy to study the effect of the initial state (matter vs. antimatter) on the transverse momentum spectra of identified particles. Our results show that the net baryon-number difference in the initial state significantly enhances nucleon production at low collision energies, while its effect becomes negligible for high-multiplicity particles or at high collision energies, as expected. These findings further prove that the PACIAE 4.0 model is a versatile and reliable tool for studying high-energy collision physics.

Particle productions in $p\bar{p}$ collisions in the PACIAE 4.0 model

Abstract

We investigate the particle production in proton-antiproton () collisions using the PACIAE 4.0 model. The pseudorapidity density distributions () and transverse momentum () spectra of charged particles from nonsingle diffractive (NSD) collisions agree well with the experimental data when using model parameters previously determined from nonsingle diffractive proton-proton () collisions. Furthermore, we systematically compare results from both inelastic (INEL) and nonsingle diffractive and collisions at the same energy to study the effect of the initial state (matter vs. antimatter) on the transverse momentum spectra of identified particles. Our results show that the net baryon-number difference in the initial state significantly enhances nucleon production at low collision energies, while its effect becomes negligible for high-multiplicity particles or at high collision energies, as expected. These findings further prove that the PACIAE 4.0 model is a versatile and reliable tool for studying high-energy collision physics.
Paper Structure (4 sections, 5 figures)

This paper contains 4 sections, 5 figures.

Table of Contents

  1. INTRODUCTION
  2. Brief introduction to PACIAE 4.0 model
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

Figures (5)

  • Figure 1: The program flow for a $pp(\bar{p})$ collision in the PACIAE 4.0 model.
  • Figure 2: The pseudorapidity density distributions of charged particles produced in NSD $p\bar{p}$ collisions at $\sqrt{s}= 0.54, 0.63, 1.8$ TeV from PACIAE 4.0 model simulations compared with experimental data from UA1, CDF and P238 collaborations UA1:1982yyhHarr:1997saCDF:1989nkn.
  • Figure 3: The transverse momentum spectra of charged particles produced in NSD $p\bar{p}$ collisions at $\sqrt{s}= 0.54, 0.63, 1.8$ TeV from PACIAE 4.0 model simulations compared with UA1 and CDF experimental data UA1:1982fuxCDF:1988evs.
  • Figure 4: The transverse momentum spectra of $\pi^+$, $K^+$, protons and neutrons produced in INEL $p\bar{p}$ collisions and $pp$ collisions at $\sqrt{s}= 0.1, 0.2, 2.76$ TeV from PACIAE 4.0 simulations.
  • Figure 5: Comparison of transverse momentum spectra of protons and neutrons produced in INEL(NSD) $p\bar{p}$ collisions and $pp$ collisions at $\sqrt{s}= 0.1$ TeV from PACIAE 4.0 simulations. The data for INEL collisions are the same as those in Fig. \ref{['fig2']}.