Pileup Correction on Higher-order Cumulants with Unfolding Approach

Abstract

Higher-order cumulants of conserved charge distributions are sensitive observables to probe the critical fluctuations near QCD critical point in heavy-ion collisions. Due to high interaction rate, pileup event can be one of the major sources of background in the measurements of higher-order cumulants. In this paper, we studied the effects of pileup events on higher-order cumulants of proton multiplicity distributions using UrQMD model. It is found that the proposed pileup correction fails if the correction parameters are determined by the Glauber fitting of charged particle multiplicities, which is usually done in the real heavy-ion experiment. To address this, we propose a model independent unfolding approach to determine the parameters in the pileup correction. This approach can be applied in the pileup correction for the future measurement of higher-order cumulants in heavy-ion collision experiment.

arXiv comment14 pages, 6 figures

References in corpus (32)

• The phase diagram of dense QCD
• Non-Gaussian fluctuations near the QCD critical point
• Mapping the Phases of Quantum Chromodynamics with Beam Energy Scan
• On the sign of kurtosis near the QCD critical point
• Search for the QCD Critical Point with Fluctuations of Conserved Quantities in Relativistic Heavy-Ion Collisions at RHIC : An Overview
• The QCD Equation of State to $\mathcal{O}({\mu }_B^6)$ from Lattice QCD
• The QCD phase structure at finite temperature and density
• QCD at finite temperature and chemical potential from Dyson-Schwinger equations
• Scale for the Phase Diagram of Quantum Chromodynamics
• Hadronic fluctuations at the QCD phase transition
• Fluctuations as probe of the QCD phase transition and freeze-out in heavy ion collisions at LHC and RHIC
• Third moments of conserved charges as probes of QCD phase structure
• Non-monotonic energy dependence of net-proton number fluctuations
• Cumulants and Correlation Functions of Net-proton, Proton and Antiproton Multiplicity Distributions in Au+Au Collisions at energies available at the BNL Relativistic Heavy Ion Collider
• QCD phase structure from functional methods
• QCD critical region and higher moments for three flavor models
• Collision Energy Dependence of Moments of Net-Kaon Multiplicity Distributions at RHIC
• Exploring the QCD Phase Structure with Beam Energy Scan in Heavy-ion Collisions
• Baryon number fluctuations in the QCD phase diagram from Dyson-Schwinger equations
• QCD phase transitions via a refined truncation of Dyson-Schwinger equations
• Locate QCD Critical End Point in a Continuum Model Study
• A Study of the Properties of the QCD Phase Diagram in High-Energy Nuclear Collisions
• The kurtosis of net baryon number fluctuations from a realistic Polyakov--Nambu--Jona-Lasinio model along the experimental freeze-out line
• Quartic cumulant of baryon number in the presence of QCD critical point
• Lattice simulations of the QCD chiral transition at real baryon density
• NA61/SHINE results on fluctuations and correlations at CERN SPS energies
• Identifying the presence of the critical end point in QCD phase diagram by higher order susceptibilities
• Pileup corrections on higher-order cumulants
• Reconstructing particle number distributions with convoluting volume fluctuations
• Measurement of the Sixth-Order Cumulant of Net-Proton Distributions in Au+Au Collisions from the STAR Experiment
• Recent results on net-baryon fluctuations in ALICE
• Critical endpoint of QCD in a finite volume

Cited by in corpus (3)

• Search for the QCD Critical Point in High Energy Nuclear Collisions
• Higher-Order Cumulants and Correlation Functions of Proton Multiplicity Distributions in $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV Au+Au Collisions at the RHIC STAR Experiment
• Beam Energy Dependence of Fifth and Sixth-Order Net-proton Number Fluctuations in Au+Au Collisions at RHIC