2022/11/13 by M. N. Anaam, Liang Zheng, Anaam, M. N. +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2211.06983
openalex publication_date 2022/11/13 · openalex created_date 2022/11/23 · openalex updated_date 2026/07/28
Strange hadron production in pp collisions at √(s)= 7 TeV is studied with PYTHIA 8 and EPOS event generators via the two-particle correlation method. After pairing charged particles as trigger particles with associated strange hadrons (K0S and (Λ/Λ) , the strange baryon to meson per trigger yield ratios YΔφh-(Λ+Λ)//2YΔφ^h-K0S dependent on transverse momentum (pT) are investigated within the near- and away-side jet region as well as the underlying event (UE) region. The modified string fragmentation effects of color reconnection and string shoving mechanisms implemented in PYTHIA 8 and the final state evolution effects built in EPOS are compared in this study. It is found that pT dependence of the Λ/K0S per trigger yield ratio in UE is similar to that in the inclusive measurements while the in-jet result is smaller. We also show that the Λ/K0S ratio at both near- and away-side jet region in the intermediate pT region decreases significantly with trigger pT, which suggests the hard process effects might contribute to the strange baryon to meson enhancement at intermediate pT. The much higher Λ/K0S ratio in UE and the striking difference between the near and away side of the in-jet results with low trigger pT predicted by the EPOS model indicate that the soft process effects induced by the final state evolution further increase the strange baryon production and can be still effective in a higher pT region compared to the string fragmentation type models.