Speaker
Description
Recently, the NA61/SHINE collaboration has presented experimental data on $K^0_s$ meson productions in proton-proton interactions at projectile momenta ($P_{lab}$) of 31, 40 and 80 GeV/c [1]. Earlier, the collaboration obtained the analogous experimental data at
$P_{lab}$=158 GeV/c [2]. As it was shown in [1,2] , there are no Monte Carlo models that can well describe all the experimental data. Only at $P{lab}$=158 GeV/c, the EPOS model reproduces reasonably well the experimental data.
The description of the experimental data of the NA61/SHINE collaboration by the Geant4 FTF model [3] will be given in our report. According to the FTF model, $K^-$ mesons are mainly produced by the fragmentation of quarks and antiquarks. Productions of $K^+$ mesons are connected with the fragmentation of di-quarks. The $K^0_s$ meson yields are coupled with the fragmentation of either quarks/anti-quarks or di-quarks.
Earlier, we have described [4] experimental data on $K^+$ and $K^-$ meson productions in the proton-proton interactions measured by the NA61/SHINE collaboration. In that study, the main problem that we have identified was the tuning of the fragmentation of di-quarks for $K^+$ mesons. The experimental data on $K^0_s$ meson production allowed us to check our tuning. Now, we have reached the best description of $K^0_s$ yields in the proton-proton collisions.
The mechanism of the $K^0_s$ meson production can be studied using two-particle transverse-momentum correlations proposed by us in [5]. The correlations between $K^0_s$ mesons and $\Lambda$ hyperons, protons, $К^-$, $\pi^-$ mesons produced in proton-proton interactions at center-of-mass energy of NN collisions of 10 GeV have been calculated in the Geant4 FTF and Pythia 6.4 models. The strong $P_T$ correlations between $K^0_s$ mesons and $\Lambda$-hyperons, $K^+$ mesons, protons have been found. The two-particle $P_T$ correlations can be studied at NICA SPD experiment. The study of the two-particle correlations can help to clarify the mechanism of quark-gluon string fragmentation.
[1] NA61/SHINE Collaboration (N. Abgrall et al.), arXiv: 2402.17025
[2] NA61/SHINE Collaboration (A. Acharya et al.), Eur. Phys. J. C82 (2022) 1.
[3] Geant4 Collaboration (J. Allison et al.) Nucl. Instrum. Meth. A835 (2016) 186.
[4] A. Galoyan and V. Uzhisnky, XXV International Baldin Seminar on High Energy Physics Problem, Sept. 2023, Dubna, Russia
[5] A.Galoyan, A.Ribon, V.Uzhinsky, MDPI Physics 5 (2023) 3, 823-831
| Section | Heavy ion collisions at Intermediate and high energies |
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