Particle production as a function of the underlying event in pp collisions simulated with PYTHIA 8
Gyula Bencédi, Antonio Ortiz, Antonio Paz
备注：
6 pages, 3 figures; to be published in the Proceedings of Science (PoS) of the 9th Edition of the Large Hadron Collider Physics Conference, 7-12 Jun 2021 (Online)
In this work we present the production of charged particles associated with high-$p_{\rm T}$ trigger particles ($8<p_{\rm T}^{\rm trig.}<15$ GeV /$c$) at mid-pseudorapidity in proton-proton collisions at $\sqrt{s}=5.02$\,TeV simulated with the \textsc{PYTHIA 8} Monte Carlo model. 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 ($π/3 <|Δϕ| <2π/3$) 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 toward and the away regions with $3\leq p_{\rm T}^{\rm assoc.}<8$ 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 (UE) contribution from the toward and the away regions in challenging environments like those characterised by large $R_{\rm T}$. We found that the signal in the away region becomes broader with increasing $R_{\rm T}$. Contrarily, the yield increases with $R_{\rm T}$ in the toward region. This effect is reminiscent of that seen in heavy-ion collisions, where an enhancement of the yield in the toward region for $0-5\%$ central Pb--Pb collisions at $\sqrt{s}_{\rm NN}=2.76$\,TeV was reported. To further understand the role of the UE and additional jet activity, the transverse region is divided into two one-sided sectors, "trans-max" and "trans-min" selected in each event according to which region has larger or smaller charged particle multiplicity. Based on this selection criterion, the observables are studied as a function of $R_{\rm T}^{\rm max}$ and $R_{\rm T}^{\rm min}$, respectively. The presented results have been published in J. Phys. G 48, no.1, 015007 (2020) and Phys. Rev. D 104, no.1, 016017 (2021).
Analysis of quarkonium polarization in proton-proton (p-p) collisions at LHC using PYTHIA model
Variable Energy Cyclotron Centre（变能回旋加速器中心）；DPBS College Anupshahr（安普沙赫 DPBS 学院）；Bali Ram Bhagat College（巴利·拉姆·巴加特学院）；Nuclear and Particle Physics Research Centre, Department of Physics, Jadavpur University（贾达普大学物理系核与粒子物理研究中心）；Saha Institute of Nuclear Physics（萨哈核物理研究所）
Strange particle production in jets and underlying events in pp collisions at $\sqrt{s}~=~7$ TeV with PYTHIA8 generator
利用PYTHIA 8事件发生器研究了$\sqrt{s}~=~7$ TeV pp碰撞中奇异强子的产生.将奇异强子与喷流区和底层事件区相匹配，有望帮助我们解开硬过程和软过程中产生的奇异粒子。在PYTHIA 8框架下，利用色重联和色绳机制，研究了奇异强子的产额和相对产额与事例多重数的关系。结果表明，色重联效应和色绳效应可以较好地描述奇异强子产生。在喷流区观察到由修正的弦碎裂机制引起的奇异重子产生的显著的多重数依赖的增强，表明奇异重子增强在硬过程和软过程中都持续存在。利用喷注形状分析技术，在弦碎裂图中发现多奇异重子比其它奇异强子更容易与喷注轴平行。未来对这些喷流相关的奇异强子产物的实验研究将为小系统奇异性增强的起源提供更多的见解。
Comparision of modeling of prompt photon production in proton-proton collisions at energies NICA $\sqrt{s}$ =10 GeV in PYTHIA and calculations using FeynCalc
Baku State University（巴库国立大学）；Institute of Physical Problems, Baku State University（巴库国立大学物理问题研究所）
Centrality and Transverse Spherocity dependent study of charged-particle production in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV using PYTHIA8 Angantyr and AMPT models
Predictions for Identified Hadron ($π^\pm$, $K^\pm$ and $p(\overline{p})$) Production and Collective Dynamics in Oxygen-Oxygen Collisions at $\sqrt{s_{NN}}$= 7 TeV with EPOS4, AMPT-SM, and Angantyr in Pythia 8
本文用 EPOS4、AMPT-SM 与 Pythia8/Angantyr 预测 7 TeV 氧–氧碰撞中 π、K、质子的产额、谱和集体行为，并比较三者的流效应差异。
Multiplicity Dependence of Charged Particle, $ϕ$ Meson and Multi-strange Particle Productions in p+p Collisions at $\sqrt{\rm s}$ = 200 GeV with PYTHIA Simulation
System size and event shape dependence of particle-identified balance functions in proton-proton collisions at $\sqrt{s} = 13$ TeV using PYTHIA 8 and EPOS models
INFN–Sezione di Roma（意大利国家核物理研究所罗马分所）；INFN–Sezione di Bologna（意大利国家核物理研究所博洛尼亚分所）
Color reconnection as a possible mechanism of intermittency in the emission spectra of charged particles in PYTHIA-generated high-multiplicity $\textit{pp}$ collisions at energies available at the CERN Large Hadron Collider
Event Shape Engineering and Multiplicity dependent Study of Identified Particle Production in proton+proton Collisions at $\sqrt{s}$= 13 TeV using PYTHIA8
Pythia-Contrib: a modular contribution framework for the Pythia 8 event generator
University of Cincinnati（辛辛那提大学）；Perimeter Institute for Theoretical Physics（理论物理前沿研究所）；University of Toronto（多伦多大学）；Lund University（隆德大学）；University of Alabama（阿拉巴马大学）；Fermilab（费米国家加速器实验室）；International Center for Advanced Studies (ICAS)（国际高级研究中心）；ICIFI；ECyT-UNSAM（萨米恩托国立大学理学院）；University of Oklahoma（俄克拉荷马大学）
Multiplicity, transverse momentum and pseudorapidity dependence of open-heavy flavored hadron production in proton+proton collisions at $\sqrt{s}$= 13 TeV using PYTHIA8
