P. Parfenov, A. Taranenko, D. Idrisov, V. B. Luong, N. Geraksiev, A. Demanov, A. Povarov, V. Kireyeu, A. Truttse, E. Volodihin
The anisotropic collective flow is one of the key observables to study the properties of dense matter created in heavy-ion collisions. The performance of Multi-Purpose Detector (MPD) at NICA collider for directed and elliptic flow measurements is studied with Monte-Carlo simulations of heavy-ion collisions at energies $\sqrt{s_{NN}}$ = 4 - 11 GeV.
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Performance study for anisotropic flow measurements in the MPD (NICA) experiment with fixed target
本文面向 NICA 的 MPD 实验，评估固定靶模式下鉴别带电强子方位角集体流的测量性能，以支持高重子密度强相互作用物质研究。
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 $\sqrt{s_{NN}}=4-11$ GeV using different heavy-ion event generators. Different combinations of the MPD detector subsystems are used…
The Multipurpose Detector (MPD) is an experimental array, currently under construction, designed to study the nuclear matter created during the collisions that will be provided by the Nuclotron-based Ion Collider fAcility (NICA) at JINR. The MPD-NICA experiment consists of a typical array of particle detectors as those used to study heavy-ion collisions at LHC and RHIC. To increase the trigger capabilities of MPD for stage 2 of NICA operation, a detector conformed by two arrays of 80 plastic scintillator cells each located symmetrically at opposite sides of the interaction point of MPD is prop…
The Multi-Purpose Detector (MPD) is designed to study a hot and dense baryonic matter formed in heavy-ion collisions at SQRT(sNN)=4-11 GeV at the NICA accelerator complex (Dubna, Russia). Large-sized electromagnetic calorimeter (ECal) of the MPD spectrometer will provide precise spatial and energy measurements for photons and electrons in the central pseudorapidity region of |eta|<1.2. The Shashlyk-type sampling structure of the ECal is optimized for the photons energy range from about 40 MeV to 2-3 GeV. Fine segmentation and projective geometry of the calorimeter allow to deal with high multi…
Electron Identification using Machine Learning in the MPD Experiment at NICA
本文利用机器学习方法在NICA的MPD实验中提升电子识别效率，通过比较传统切片方法与MLP、BDT等分类器的性能，优化电子识别的精度与纯度。
We present the conceptual design for the miniBeBe detector proposed to be installed as a level-0 trigger for the TOF of the NICA-MPD. We discuss the design and the geometrical array of its sensitive parts, the read-out electronics as well as the mechanical support that is envisioned. We also present simulation results for p + p and Bi + Bi collisions to study its capabilities as a function of multiplicity both as a level-0 trigger for the TOF, as well as to serve as a beam-gas interaction veto and to locate the beam-beam interaction vertex.
Measurement of the number of spectators in nucleus-nucleus collisions could be used to determine the number of participant nucleons involved in the interaction, i.e. get information about collision centrality. However, at energies of the NICA collider, energy resolution of the forward hadron calorimeter is insufficient for separation amplitude corresponding to different number of spectators. Uncertainty in the number of spectators leads to a large error in determining centrality. For central events inaccuracy in determining the collision parameter is about 40%, for peripheral ones, no better t…
The goal of the Multi-Purpose Detector (MPD) experiment at NICA collider is to explore the QCD phase diagram of strongly interacting matter produced in nucleus-nucleus collisions at $\sqrt{s_{NN}}=4-11$ GeV. The performance of MPD detector for elliptic flow measurements of charged hadrons is studied with Monte-Carlo simulations using collisions of Au+Au ions employing UrQMD, SMASH, and AMPT heavy-ion event generators. Different methods for flow measurements: event plane and direct cumulants are used to investigate the contribution of non-flow correlations and flow fluctuations.
The Multi-Purpose Detector (MPD) is to be installed at the Nuclotron Ion Collider fAcility (NICA) of the Joint Institute for Nuclear Research (JINR). Its main goal is to study the phase diagram of the strongly interacting matter produced in heavy-ion collisions. These studies, while providing insight into the physics of heavy-ion collisions, are relevant for improving our understanding of the evolution of the early Universe and the formation of neutron stars. In order to extend the MPD trigger capabilities, we propose to include a high granularity beam-beam monitoring detector (BE-BE) to provi…
Performance of the MPD experiment in dielectron measurements at NICA
本研究通过模拟Bi+Bi碰撞，评估了MPD实验在NICA能区双电子测量的性能，采用多层感知机优化电子鉴别并开发配对分析策略，将信号本底比提升约3.5倍，展示了其强大潜力。
An important observable to understand the properties of the matter produced in heavy-ion collisions is its strangeness content. Recent experimental results show that in semi-central collisions, the $Λ$ and $\barΛ$ global polarization show differences that increase at low energies. This behaviour has been described using a model where these particles may be produced from two distinct density zones in the collision region: the core and the corona where QGP processes and p + p like reactions, respectively, are mainly at work. Using this idea, the polarization can be influenced by the relative abu…
The main goal of the future MPD experiment at NICA is to explore the QCD phase diagram in the region of highly compressed and hot baryonic matter in the energy range corresponding to the highest chemical potential. Properties of such dense matter can be studied using azimuthal anisotropy which is categorized by the Fourier coefficients of the azimuthal distribution decomposition. Performance of the detector response based on simulations with realistic reconstruction procedure is presented for centrality determination, reaction plane estimation, directed and elliptic flow coefficients.
Trigger efficiencies of a proposed beam monitoring detector (BeBe) for p+p collisions at NICA energies
本文提出为MPD第二阶段增设由两个80单元塑料闪烁体圆盘构成的BeBe探测器，通过实验室测量获得22±6%的能量分辨率，并基于蒙特卡罗模拟研究了其在11 GeV p+p碰撞中的触发效率。
Reconstruction of the Impact Parameter in Nucleus-Nucleus Collisions at the MPD Experiment
提出结合前向强子量能器和电磁量能器信号的方法，以抑制净质子多重数涨落研究中的自相关，实现全中心度范围的事件分类。
Bayesian Approach to Particles Identification in the MPD Experimen
针对NICA对撞机MPD探测器的粒子识别需求，研究优化TOF与TPC的识别算法，采用统计贝叶斯方法实现识别效率与误识别污染的最优平衡。
The Nuclotron-base Ion Collider fAcility (NICA) is under construction at the Joint Institute for Nuclear Research (JINR), with commissioning of the facility expected in late 2022. The Multi-Purpose Detector (MPD) has been designed to operate at NICA and its components are currently in production. The detector is expected to be ready for data taking with the first beams from NICA. This document provides an overview of the landscape of the investigation of the QCD phase diagram in the region of maximum baryonic density, where NICA and MPD will be able to provide significant and unique input. It …
Collision energy dependence of elliptic flow of identified hadrons in heavy-ion collisions using the PHSD model
本文利用PHSD模型首次预测了6.7-25 A GeV能区Au+Au碰撞中鉴别强子椭圆流的中心度和碰撞能量依赖性，验证了组分夸克数标度，并为FAIR-CBM和NICA-MPD实验提供理论参考。
Microscopic study of baryon stopping in low-energy heavy-ion collisions within UrQMD model
本研究利用UrQMD模型微观分析低能重离子碰撞中的重子阻止，发现中间快度输运质子多源于初始中子（同位旋转换），并揭示其与核透明度及化学平衡偏离的关联。
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