Electromagnetic Calorimeter for MPD Spectrometer at NICA Collider

A beam-beam monitoring detector for the MPD experiment at NICA

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…

Calibration of MPD Electromagnetic Calorimeter with Muons

Shashlyk-type electromagnetic calorimeter (ECal) of the Multi-Purpose Detector at heavy-ion NICA collider is optimized to provide precise spatial and energy measurements for photons and electrons in the energy range from about 40 MeV to 2-3 GeV. To deal with high multiplicity of secondary particles from Au-Au reactions, ECal has a fine segmentation and consists of 38,400 cells ("towers"). Given the big number of "towers" and the time constraint, it is not possible to calibrate every ECal "tower" with beam. In this paper, we describe the strategy of the first-order calibration of ECal with cosm…

Improving the spatial resolution of NICA/MPD ECAL with new reconstruction methods

A Shashlyk-type electromagnetic calorimeter (ECal) will be used in the Multi-purpose Detector at Nuclotron-based Ion Collider facility to study the properties of nuclear matter. In this experiment, the ECal detector is responsible for measuring the energy and position of the incident particles, and identifying them with the information obtained from itself and other detectors. This paper analyzes the position resolution of the Tsinghua ECal modules using the data from a beam test in DESY. Several reconstruction methods are studied in detail. With a deep learning based algorithm, the position r…

针对NICA能量下p+p碰撞的拟议束流监测探测器（BeBe）的触发效率

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。

在JINR的MPD-NICA实验中，MexNICA合作组的实验与理论成果

The MexNICA Collaboration in the MPD-NICA Experiment at JINR: Experimental and Theoretical Achievements

MexNICA合作组在JINR的MPD-NICA实验中，开发了微型BeBe触发探测器，并在QCD相图重子丰富区域进行了现象学研究，同时在格点QCD和有效模型方面取得了理论进展。

Characterisation of SiPM radiation hardness for application in hadron calorimeters at FAIR, CERN and NICA

Silicon PhotoMultipliers (SiPM) are an excellent choice for the scintillator light readout at hadron calorimeters due to their insensitivity to magnetic fields, low operating voltages, low cost, compactness and mechanical endurance. They are already successfully utilized in Projectile Spectator Detector (PSD) of NA61 at CERN, and will be utilized soon in PSD of CBM at FAIR and Forward Hadron CALorimeters (FHCAL) of BM@N at NICA heavy-ion collision experiments. The main issue of SiPM application is their degradation due to high neutron fluence that can reach up to 2E11 neq/cm2 per year of the e…

MPD实验中粒子识别的贝叶斯方法

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。

On the performance of Zero Degree Calorimeters in detecting multinucleon events

The facilities designed to study collisions of relativistic nuclei, such as the MPD at NICA (JINR), STAR at RHIC (BNL), ALICE, ATLAS and CMS at the LHC (CERN), are equipped with pairs of hadronic Zero Degree Calorimeters (ZDC) to detect forward nucleons at the both sides of the interaction point and estimate the collision centrality. The energy deposited in a ZDC fluctuates from one event to another, but on average it is proportional to the number of absorbed nucleons. Forward nucleons are also emitted in electromagnetic dissociation (EMD) of nuclei in ultraperipheral collisions, and they are …

Effect of energy leakage on the energy resolution of E.M. sampling calorimeters

The electromagnetic sampling calorimeters of the SPD experiment (NICA collider) are being investigated by Monte Carlo method. The simulation is used to study in detail the influence of energy leakages from the module on its energy resolution. The values of the stochastic and constant terms are obtained for the SPD calorimeter prototypes.

Status and initial physics performance studies of the MPD experiment at NICA

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 …