Pinning down the origin of "strangeness enhancement" in the jet-like region of pp collisions with Monte Carlo simulations
Abstract
A recent ALICE measurement reports a finite strangeness enhancement in the toward-leading region of high-multiplicity proton-proton collisions. In this work, the trigger transverse momentum, pTtrigg, dependence is investigated using K0S and Ξ± production in PYTHIA8, with and without color ropes, and EPOS-LHC. For 3 < pTtrigg < 15~GeV/c, EPOS-LHC and PYTHIA8 with color ropes exhibit a multiplicity-dependent increase of the toward-leading Ξ±/K0S ratio, while the rope-free PYTHIA8 baseline shows a weaker dependence. With increasing trigger momentum, the enhancement is strongly suppressed in EPOS-LHC for pTtrigg≳10~GeV/c, whereas it remains approximately unchanged in PYTHIA8 with color ropes. This contrasting behavior is consistent with a reduced core contribution in EPOS-LHC and a local string-overlap mechanism in PYTHIA8 with color ropes. The trigger transverse momentum thus provides a model-sensitive probe of the mechanisms contributing to the apparent strangeness enhancement in the jet-like region of the pp collisions.
Related
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- Influence of strangeness on the anisotropic flow of prompt Ds± mesons in PbPb collisions at [b]sNN=5.02TeV
- Strangeness Production in Heavy-Ion Collisions: Color Ropes or Hydrodynamic Evolution?
- Exploring the origin of D0 meson elliptic flow in PbPb collisions at sNN=5.02TeV using event shape engineering
- Exploring the origin of D0 meson elliptic flow in PbPb collisions at √(sNN) = 5.02 TeV using event shape engineering
BibTeX
@misc{ortiz2026pinning,
title = {{Pinning down the origin of "strangeness enhancement" in the jet-like region of pp collisions with Monte Carlo simulations}},
author = {Antonio Ortiz and Dushmanta Sahu and Victor Vázquez},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.09236},
eprint = {2610.09236},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.09236},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Pinning down the origin of "strangeness enhancement" in the jet-like region of pp collisions with Monte Carlo simulations
AU - Antonio Ortiz
AU - Dushmanta Sahu
AU - Victor Vázquez
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2610.09236
UR - https://arxiv.org/abs/2610.09236
AB - A recent ALICE measurement reports a finite strangeness enhancement in the toward-leading region of high-multiplicity proton-proton collisions. In this work, the trigger transverse momentum, p_T^trigg, dependence is investigated using K^0_S and Ξ^± production in PYTHIA8, with and without color ropes, and EPOS-LHC. For 3 < p_T^trigg < 15~GeV/c, EPOS-LHC and PYTHIA8 with color ropes exhibit a multiplicity-dependent increase of the toward-leading Ξ^±/K^0_S ratio, while the rope-free PYTHIA8 baseline shows a weaker dependence. With increasing trigger momentum, the enhancement is strongly suppressed in EPOS-LHC for p_T^trigg≳10~GeV/c, whereas it remains approximately unchanged in PYTHIA8 with color ropes. This contrasting behavior is consistent with a reduced core contribution in EPOS-LHC and a local string-overlap mechanism in PYTHIA8 with color ropes. The trigger transverse momentum thus provides a model-sensitive probe of the mechanisms contributing to the apparent strangeness enhancement in the jet-like region of the pp collisions.
ER -