This paper presents the production of charged particles associated with high-p _T trigger particles ( GeV/c) at midrapidity in proton–proton collisions at TeV simulated with PYTHIA 8.244. The study is performed as a function of the relative transverse activity classifier, R _T, which is the relative charged-particle multiplicity in the transverse region (π/3 < |ϕ ^trig. − ϕ ^assoc.| < 2π/3) of the di-hadron correlations, and it is sensitive to the multi-parton interactions. The evolution of the yield of associated particles on both the towards and the away regions ( GeV/c) as a function of R _T is investigated. We propose a strategy which allows for the modelling and subtraction of the underlying event contribution from the towards and the away regions in challenging environments like those characterised by large R _T. We found that the signal in the away region becomes broader with increasing R _T, while its corresponding yield is independent of R _T. Contrarily, the yield increases with R _T in the towards region. This effect is reminiscent of that seen in heavy-ion collisions, where an enhancement of the yield in the towards region for 0%–5% central Pb–Pb collisions at TeV was reported. A discussion on the origin of these effects in PYTHIA, as well as their implications for the interpretation of recent LHC results for pp collisions, is presented.

本文介绍了在PYTHIA 8.244模拟的TeV质子-质子碰撞中，在中间快时与高p _T触发粒子（GeV / c）相关的带电粒子的产生。该研究为相对横向活动分类器，的函数来执行ř _Ť，这是在横向区域的相对带电粒子多重性（π / 3 <| φ ^。TRIG - φ ^。ASSOC | <2 π / 3）的双强子相关，并且它对多部分相互作用很敏感。朝向和远离区域（GeV / c）上相关粒子产量的变化是研究了 _RT。我们提出了一种策略，该模型允许在具有挑战性的环境（例如，具有较大R _T的环境）中对来自和远离区域的潜在事件贡献进行建模和减去。我们发现，随着R _T的增加，远离区域的信号变得更宽，而其相应的产量与R _T无关。相反，在R 区域中，产量随R _T的增加而增加。这种效果让人想起重离子碰撞，在0％–5％的中心Pb–Pb碰撞时，朝区域的屈服增强报道了TeV。讨论了PYTHIA中这些效应的起源，以及它们对pp碰撞最近的LHC结果的解释的含义。