Particle production as a function of charged-particle flattenicity in pp collisions at $\sqrt{s}$ = 13 TeV

Abstract

This paper reports the first measurement of the transverse momentum ($p_{\mathrm{T}}$) spectra of primary charged pions, kaons, (anti)protons, and unidentified particles as a function of the charged-particle flattenicity in pp collisions at $\sqrt{s}=13$ TeV. Flattenicity is a novel event shape observable that is measured in the pseudorapidity intervals covered by the V0 detector, $2.8<\eta<5.1$ and $-3.7<\eta<-1.7$. According to QCD-inspired phenomenological models, it shows sensitivity to multiparton interactions and is less affected by biases towards larger $p_{\mathrm{T}}$ due to local multiplicity fluctuations in the V0 acceptance than multiplicity. The analysis is performed in minimum-bias (MB) as well as in high-multiplicity events up to $p_{\mathrm{T}}=20$ GeV/$c$. The event selection requires at least one charged particle produced in the pseudorapidity interval $|\eta|<1$. The measured $p_{\mathrm{T}}$ distributions, average $p_{\mathrm{T}}$, kaon-to-pion and proton-to-pion particle ratios, presented in this paper, are compared to model calculations using PYTHIA 8 based on color strings and EPOS LHC. The modification of the $p_{\mathrm{T}}$-spectral shapes in low-flattenicity events that have large event activity with respect to those measured in MB events develops a pronounced peak at intermediate $p_{\mathrm{T}}$ ($2

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在 $\sqrt{s}$ = 13 TeV 的 pp 对撞中，粒子产生与带电粒子平坦性的函数关系

本文报告了在$\sqrt{s}=13$ TeV的pp对撞中首次测量的原初带电小离子、高子、（反）质子和不明粒子的横动量（$p_{m\mathrm{T}}$）谱与带电粒子扁平度的函数关系。扁平性是一种新的事件形状观测指标，它是在V0探测器覆盖的假负电率区间（2.8

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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