Two-particle number and transverse momentum balance function with event topology in pp collisions at $\sqrt{s}=13$ TeV

Abstract

The first study of charge-dependent two-particle differential number ($B$) and momentum balance functions ($P_2^{CD}$) with respect to an event shape variable, transverse spherocity, is reported. Results are presented from PYTHIA8 and EPOS-LHC model calculations in proton-proton (pp) collisions at $\sqrt{s}=13$ TeV. To distinguish between back-to-back jet-like topologies and isotropic events, low and high transverse spherocity values are chosen. The correlation functions are measured as a function of averaged charged-particle multiplicity ($⟨N_{ch}⟩$) in relative pseudorapidity ($\Delta \eta$) and relative azimuthal angle ($\Delta \varphi$) with $|\eta |<2.4$ and $0.2<p_{\mathrm{T}}<2.0$ GeV. A narrowing of the balance function width is observed in $\Delta \eta$ and $\Delta \varphi$ from low- to high-multiplicity collisions. Wider balance functions are found in isotropic events as compared to jet-like events. However, for the momentum correlations, a nearly flat dependence is observed with $⟨N_{ch}⟩$. This study investigates charge conservation mechanisms and their correlations for events classified with jet-like and isotropic topologies. To isolate medium-driven effects, we compare EPOS-LHC with its hydrodynamic core enabled and disabled and observed narrowing patterns in $B$ and $P_2^{CD}$ as a quantitative handle on radial-flow-induced localization of charge-balancing pairs.

15 pages, 11 figures

References in corpus (46)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• EPOS LHC : test of collective hadronization with LHC data
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
• Color reconnection and flow-like patterns in pp collisions
• Measurement of long-range near-side two-particle angular correlations in pp collisions at sqrt(s) = 13 TeV
• Phenomenology of event shapes at hadron colliders
• The ALICE experiment: a journey through QCD
• Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeV
• On the Origin of the "Ridge" phenomenon induced by Jets in Heavy Ion Collisions
• Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Elliptic flow of charm and strange hadrons in high-multiplicity pPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 8.16 TeV
• Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV
• Balance Functions from Au+Au, d+Au, and p+p Collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Core-corona procedure and microcanonical hadronization to understand strangeness enhancement in proton-proton and heavy ion collisions in the EPOS4 framework
• Balance functions in coalescence model
• Femtoscopy in Relativistic Heavy Ion Collisions and its Relation to Bulk Properties of QCD Matter
• Overview of high-density QCD studies with the CMS experiment at the LHC
• The Role of Baryon Number Conservation in Measurements of Fluctuations
• General Charge Balance Functions, A Tool for Studying the Chemical Evolution of the Quark-Gluon Plasma
• Longitudinal scaling property of the charge balance function in Au + Au collisions at 200 GeV
• Multi-Parton Interactions in pp collisions from Machine Learning-based regression
• Two particle differential transverse momentum and number density correlations in p-Pb and Pb-Pb at the LHC
• Novel observables for exploring QCD collective evolution and quantum entanglement within individual jets
• Event Shape Engineering and Multiplicity dependent Study of Identified Particle Production in proton+proton Collisions at $\sqrt{s}$= 13 TeV using PYTHIA8
• Emergence of long-range angular correlations in low-multiplicity proton-proton collisions
• Two-particle azimuthal correlations in $\gamma$p interactions using pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
• Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at $\sqrt{s}$ = 13 TeV
• Differential two-particle number and momentum correlations with the AMPT, UrQMD, and EPOS models in Pb-Pb collisions at $\sqrt{{\text{s}}_{{}_{\mathrm{NN}}}}$= 2.76 TeV
• General balance functions of identified charged hadron pairs of $(\pi ,\mathrm{K},\mathrm{p})$ in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at $\sqrt{s}=13$ TeV
• Boost Invariance and Multiplicity Dependence of the Charge Balance Functionin ${\pi }^{+}p$ and $K^{+}p$ Collisions at $\sqrt{s}=22$ GeV/c
• Light-flavor particle production in high-multiplicity pp collisions at $\sqrt{\text{s}}=13$ TeV as a function of transverse spherocity
• Simulation studies of ${\mathrm{R}}_2(\mathrm{\Delta }\eta ,\mathrm{\Delta }\phi )$ and ${\mathrm{P}}_2(\mathrm{\Delta }\eta ,\mathrm{\Delta }\phi )$ correlation functions in pp collisions with the PYTHIA and HERWIG models
• Heavy ion collisions: Correlations and Fluctuations in particle production
• Balance of baryon number in the quark coalescence model
• Elliptic flow splittings in the Polyakov-looped Nambu-Jona Lasinio transport model
• Multiplicity and transverse momentum dependence of charge-balance functions in pPb and PbPb collisions at LHC energies
• Charm balance function in relativistic heavy-ion collisions
• Baryon correlations in Pythia
• Measurements of differential two-particle number and transverse momentum correlation functions in pp collisions at $\sqrt{\text{s}}$ = 13 TeV