Physics of Particles and Nuclei Letters最新文献

VEPP-5 injection complex located at BINP SB RAS delivers electron and positron beams through transportation channels to the VEPP-4M and VEPP-2000 colliders. It is necessary to change magnetic field vectors in dipole magnets to deliver particles which have different charges, such as positrons and electrons. Because of some physics effects in order to achieve precise adjustment of field, it is better to register not only current in magnet coils, but also the field in the transportation channel of the injection complex itself. The aim of the work is development of the device which would measure a magnetic field in the injection complex transportation channel with an accuracy better than ({{10}^{{ - 3}}}). Hall effect method is chosen. The tests on Hall sensors resistance to radiation are conducted. The device prototype for this experiment is created, assembled and tested. The change of Hall parameters due to time spent in radiation is registered. The experiment successfully demonstrated that the hall sensors operate in conditions of the injection complex radiation.

The paper provides details and an update on the Workload Management System Middleware along-side Pilot Agent, that are part of SPD Online Filter—computing system dedicated for multi-step high- throughput processing of data from Data Acquisition System of SPD NICA detector.

Event indexing, or event metadata systems are common for particle physics experiments. Their main goal is to keep a searchable catalogue of physics events, a subset of which can be retrieved based on given filtering criteria. The Event Metadata System (EMS) of the BM@N experiment has been previously designed, developed and deployed and is being improved now to increase its performance, convenience for users, as well as fault tolerance. In this paper, the architecture of the current version of the BM@N EMS is reviewed and some recent improvements that have been applied are presented.

Testing of server equipment prior to its operation is crucial for ensuring reliable and smooth operation of systems at the Multifunctional Information and Computation Complex of the Joint Institute for Nuclear Research. The main purpose of testing is to identify hidden defects that may arise under critical loads on the equipment. There are various empirical methods described in production standards used to detect equipment failures. The paper presents an automated system for testing server equipment, including automation of system installation, launching tests, and collecting test logs. In the current implementation of the system, testing is carried out using the method of Highly Accelerated Stress Screening (HASS). A key part of the system is the monitoring subsystem required for collecting and analyzing temperature data from the tested components. Temperature metrics analysis during the testing phase allows to determine the duration of testing with a given accuracy. In addition to the monitoring tools such as Node Exporter, Prometheus, Prometheus Gateway and Grafana, the system uses Stress-ng to load the equipment with synthetic tests. All of these subsystems are freely distributed, and the proposed system can be easily implemented for similar testing in comparable infrastructures.

—The phase dynamics and resonance properties of the superconductor-ferromagnet-superconductor ({{varphi }_{0}})-junction, have been investigated. Based on the numerical simulation of current-voltage characteristic (CVC) of ({{varphi }_{0}})-junction the modulation of magnetization components along the CVC is shown. Using the analytical approach its demonstrated that the eigenfequancy of the system has a periodic behaviour. This fact prove the realization of the parametric resonance in the ({{varphi }_{0}})-junction and the obtained modulation is the result of parametric resonance. We expect that the obtained results can be used in the development of novel technologies in the field of superconducting electronics and spintronics.

Masses of the ground and orbitally excited states of triply heavy tetraquarks with one open and another hidden heavy flavors are calculated within the relativistic quark model, based on the quasipotential approach and QCD, within the diquark–antidiquark picture of tetraquarks. The relativistic quasipotential equation takes into account all spin-dependent and spin-independent relativistic contributions and the internal structure of the diquarks. The calculated masses of such tetraquarks are compared with the strong fall–apart decay thresholds into a heavy and heavy–light mesons. The states that could be observed as narrow resonances in other decay modes are identified.

In the context of modern accelerator technology, it is essential to guarantee the specified characteristics of the extracted electron beam. In addition to the information regarding the energy and intensity of the beam, it is crucial to ascertain its spatial and angular distribution. This paper introduces the first step towards realization of a multi-angle scanning method for 2D electron beam profile reconstruction.

NA64 is an experiment to search for dark matter particles. Its main goal is to search for the so-called dark photon A', a vector mediator between ordinary and dark matter. One of the possible channels for the production of A' is the invisible decay of the ρ⁰ meson formed in the photoproduction process. The number of ρ⁰ mesons that could be obtained in the NA64 was estimated in the article.

We present a detailed study of the forward-backward asymmetry in the Drell–Yan process, using a next-to-leading order perturbative QCD calculation within the collinear factorization scheme, including the effects of (gamma {text{/}}{{Z}^{0}}) boson exchange. We analyze (Q) and ({{Q}_{T}}) dependence and compare theoretical predictions with available data from the CMS Collaboration at the LHC.

The experimental discovery of resonant-like states in the di-(J{text{/}}psi ) mass spectra in (pp) collisions near the production threshold suggests the existence of fully-charmed tetraquarks (broad structure at 6600 MeV and narrow structures at 6900 and 7200 MeV). Numerous theoretical models following this discovery provide descriptions of the observed data, propose mechanisms underlying formation of this new states, and predict additional phenomena. Further investigations require precision experimental measurements. In this work, the amplitude analysis method is applied to describe mass and angular spectra of the observed signals in ATLAS experimental data simultaneously in (J{text{/}}psi )-(J{text{/}}psi ) and (J{text{/}}psi )-(psi (2S)) decay channels. Mass and width of the resonances are measured accounting for interference effects between signals and background.