发表机构
Instituto de Ciencias Nucleares, UNAM（墨西哥国立自治大学核科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过比较PYTHIA8（有/无色绳）和EPOS-LHC模拟，研究pp碰撞中触发横动量对奇异数增强的影响，揭示不同模型机制，为理解奇异数增强起源提供模型敏感探针。
AI 中文摘要
近期ALICE测量报告在高多重数质子-质子碰撞的朝前领头区域中存在有限的奇异数增强。本工作利用PYTHIA8（有和无色绳）及EPOS-LHC中的K0S和Ξ±产生，研究了触发横动量p_T^trigg的依赖性。对于3 < p_T^trigg < 15 GeV/c，EPOS-LHC和带色绳的PYTHIA8展现出随多重数增加的朝前领头Ξ±/K0S比值，而无色绳的PYTHIA8基线则表现出较弱的依赖性。随着触发动量增加，在EPOS-LHC中，对于p_T^trigg≳10 GeV/c，增强被强烈抑制，而在带色绳的PYTHIA8中则大致保持不变。这种对比行为与EPOS-LHC中核心贡献的减少以及PYTHIA8带色绳中的局域弦重叠机制一致。因此，触发横动量提供了对pp碰撞喷注区表观奇异数增强贡献机制具有模型敏感性的探针。
英文摘要
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, $p_{\rm T}^{\rm trigg}$, dependence is investigated using ${\rm K}^{0}_{\rm S}$ and $Ξ^{\pm}$ production in PYTHIA8, with and without color ropes, and EPOS-LHC. For $3 < p_{\rm T}^{\rm trigg} < 15$~GeV/$c$, EPOS-LHC and PYTHIA8 with color ropes exhibit a multiplicity-dependent increase of the toward-leading $Ξ^{\pm}/{\rm K}^{0}_{\rm S}$ ratio, while the rope-free PYTHIA8 baseline shows a weaker dependence. With increasing trigger momentum, the enhancement is strongly suppressed in EPOS-LHC for $p_{\rm T}^{\rm trigg}\gtrsim10$~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.
Comments9 pages, 5 captioned figures
