Performance studies of anisotropic flow with MPD at NICA

Petr Parfenov,Ilya Selyuzhenkov,Arkadiy Taranenko,Peter Senger

doi:10.1051/epjconf/201920407010

Petr Parfenov, Ilya Selyuzhenkov + Show 2 more

Open Access

https://doi.org/10.1051/epjconf/201920407010

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Abstract

The Multi-Purpose Detector (MPD) at NICA collider has a substantial discovery potential concerning the exploration of the QCD phase diagram in the region of high net-baryon densities and moderate temperatures. The anisotropic transverse flow is one of the key observables to study the properties of dense matter created in heavy-ion collisions. The MPD performance for anisotropic flow measurements is studied with Monte-Carlo simulations of gold ions at NICA energies $\sqrt {{S_{NN}}} = 4 - 11\,{\rm{GeV}}$ using different heavy-ion event generators. Different combinations of the MPD detector subsystems are used to investigate the possible systematic biases in flow measurements, and to study effects of detector azimuthal non-uniformity. The resulting performance of the MPD for flow measurements is demonstrated for directed and elliptic flow of identified charged hadrons as a function of rapidity and transverse momentum in different centrality classes.

Highlights

Experimental and theoretical studies of the thermodynamical properties of quark-gluon matter are one of the top priorities worldwide in high-energy heavy-ion physics [1]
The centrality determination is based on the multiplicity of the charged particles reconstructed by the Time-Projection Chamber (TPC), and the anisotropic flow analysis for Au+Au collisions is presented for the two energies corresponding the highest and lowest ones of the NICA collider
Tracks are selected according to the following criteria: |η| < 1.5; 0.2 < pT < 2 GeV/c; NhTitPsC > 32; 2σ DCA cut for primary particle selection; particle identification (PID) using dE/dx from TPC and m2 calculated from Time-of-Flight detector (TOF) [9]

Summary

Introduction

Experimental and theoretical studies of the thermodynamical properties of quark-gluon matter are one of the top priorities worldwide in high-energy heavy-ion physics [1]. Transverse anisotropic flow measurements are one of the key methods to study the time evolution of the strongly interacting medium formed in nuclear collisions. In non-central collisions, the initial spatial anisotropy results in an azimuthally anisotropic emission of particles. The magnitude of the anisotropic flow can be defined via the Fourier coefficients vn{Ψm} of azimuthal distribution of the emitted particles with respect to the reaction plane [2]: dN d(φ − Ψm). Where φ – is the azimuthal angle of the particle, n – is the harmonic order and Ψm is the m-th order collision symmetry plane angle. V1 and v2 are called directed and elliptic flow, respectively Where φ – is the azimuthal angle of the particle, n – is the harmonic order and Ψm is the m-th order collision symmetry plane angle. v1 and v2 are called directed and elliptic flow, respectively

Simulation and analysis setup

Results

Resolution correction factor

Azimuthal anisotropic flow

Summary