论文标题
质子质子碰撞中的喷射样产量明显修饰，较大的底层事件
Apparent modification of the jet-like yield in proton-proton collisions with large underlying event
论文作者
论文摘要
本文介绍了与高$ p _ {\ rm t} $触发粒子相关的带电粒子的产生（$ 8 <p _ {\ rm t}^{\ rm trig。} <\ rm trig。} <15 $ gev/$ gev/$ c $ in Proton-proton in $ \ sqrt {s sqrt {s} = 5.02 $ tev in proton-proton collisions in Proton-proton collisions in Proton-proton collisions = 5.02 $ tev n.2 sim.2 sim.2 sim.2 p.4该研究是作为相对横向活动分类器的函数进行的，$ r _ {\ rm t} $，它是横向区域中的相对充电寄生物多重性（$π/3 <| ϕ^{\ rm trig。} - 互动。相关粒子的近侧和客场产量的演变（$ 3 \ leq p _ {\ rm t}^{\ rm sec.。} <8 $ gev/$ c $）作为$ r _ {\ rm t} $的函数。我们提出了一种策略，该策略允许在充满挑战的环境中从附近和客场贡献基础事件的建模和减法，例如以大$ r _ {\ rm t} $为特征的人。我们发现，随着$ r _ {\ rm t} $的增加，客场信号变得更宽，而其相应的收益率与$ r _ {\ rm t} $无关。相反，近距离收益率以$ r _ {\ rm t} $增加。这种效果让人联想到重型离子碰撞中看到的效果，在$ \ sqrt {s _ {\ rm nn}} = 2.76 $ tev中，近距离收益率提高了0-5％中央PB-PB碰撞。介绍了关于这些影响在毕毕田中的起源的讨论，以及它们对最近LHC结果对PP碰撞的解释的影响。
This paper presents the production of charged particles associated with high-$p_{\rm T}$ trigger particles ($8<p_{\rm T}^{\rm trig.}<15$ GeV/$c$) in proton-proton collisions at $\sqrt{s}=5.02$ TeV simulated with PYTHIA 8.244. The study is performed as a function of the relative transverse activity classifier, $R_{\rm T}$, which is the relative charged-particle multiplicity in the transverse region ($π/3<|ϕ^{\rm trig.}-ϕ^{\rm assoc.}|<2π/3$) of the di-hadron correlations, and it is sensitive to the Multi-Parton Interactions. The evolution of both the near and the away-side yield of associated particles ($3\leq p_{\rm T}^{\rm assoc.}< 8$ GeV/$c$) as a function of $R_{\rm T}$ is investigated. We propose a strategy which allows for the modelling and subtraction of the underlying event contribution from the near and the away side in challenging environments like those characterised by large $R_{\rm T}$. We found that the away-side signal becomes broader with increasing $R_{\rm T}$, while its corresponding yield is independent of $R_{\rm T}$. Contrarily, the near-side yield increases with $R_{\rm T}$. This effect is reminiscent of that seen in heavy-ion collisions, where an enhancement in the near-side yield for 0-5% central Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ 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.
