Physics of Particles and Nuclei Letters最新文献

In this work we use the Soft Gluon Resummation approach as a noncollinear factorization model to describe polarisation of (J{text{/}}psi ) within NRQCD as a hadronization model. We extract nonperturbative LDME for octet color states of charmonium by fitting them to unpolarised (J{text{/}}psi ) production data of PHENIX and STAR collaborations at (sqrt s = 200) GeV. We make prediction for an angular coefficient (lambda ) as a polarisation indicator for (J{text{/}}psi ) in the helicity frame and compare it with the PHENIX polarisation data.

The paper presents a multiscale modeling of defect formation and latent track generation processes under irradiation of neodymium-doped yttrium-aluminum garnet ceramics with xenon swift heavy ions. The structural characteristics of the material before and after interaction with Xe ions are calculated, and the sizes of the amorphized region of the crystalline matrix are estimated. The theoretical X-ray diffraction pattern is calculated and compared with the experimental one. Good qualitative and quantitative agreement between the calculation results and the experiment is demonstrated, and an interpretation of the X-ray diffraction data is proposed based on the results of molecular dynamics modeling.

The NICA accelerator complex (JINR) [1] includes a linac of heavy ions (LHI), designed to inject ions with a mass-to-charge ratio A/Z ≤ 6.35 into the storage Booster synchrotron. Commissioning work with accelerated Xe²⁸⁺ ions has shown that the intensity of the heavy ion beam is insufficient for the Collider experiments. The last acceleration session ended in February 2023. It has been devoted to the preparation of the collider for operation, as well as the slow extraction of a beam with an energy of 3.9 GeV/n for the BM@N experiment. To increase the beam intensity, a multiple injection technique has been developed and tested. The article presents the results of setting up the multiple injection mode for experiments with heavy ions at the NICA collider.

The dependence of the phase structure obtained in the framework of effective NJL model on regularization scheme and fit used is rather well known. It has been shown in this letter that with good precision the phase structure of dense quark matter with isospin and chiral imbalances are the same for different regularization schemes. For example, recent prediction of pion condensation in dense quark matter with chiral imbalance and its resilience against color superconductivity phenomenon, which is dominant at high baryon densities.

In this paper we compare data from Belle II and BaBar with available results of theoretical approaches for (B to {{K}^{{(*)}}}nu bar {nu }) decays. The theoretical predictions for ({{B}^{ + }} to {{K}^{ + }}nu bar {nu }) are lower than experimental data. This may indicate on the possibility of new physics effects in this decay.

This paper presents a software-hardware complex for measuring the tension of the anode wire in drift tubes used in the SPD experiment’s straw tracker at the NICA collider. The tension of the anode wire is critical for ensuring the accuracy of coordinate determination, as it affects electrical stability and the positioning of the wire due to electrostatic and gravitational forces. The developed complex employs an electromagnetic measurement method, allowing for high-precision control of the tension in thin-walled Mylar tubes. The device measures tension by analyzing wire vibrations. The central component of the system is the STM32L4 microcontroller, which manages the delivery of electrical pulses and performs measurements. The advantages of the complex include ease of setup, a user-friendly interface, and high measurement speed, making it suitable for mass production. Testing confirmed the device’s high accuracy and efficiency. Thus, the developed complex represents a significant advancement in the technology for assembling high-precision wire detectors.

Ibuprofen is a representative of a group of nonsteroidal anti-inflammatory drugs widely used in modern medicine. This article presents the results of the ibuprofen structure and dynamics investigations using IR- and Raman-spectroscopy in combination with quantum chemical calculations in the DFT approximation. Ibuprofen R-S dimer cluster model was used for calculations. Discussion is focused on the key parameters of the molecular geometry of the cyclic R-S dimer and vibrations of the H-bonded carboxylic COOH group of ibuprofen.

In this work, the current experimental status of studying ({{Z}_{c}}(4200)) state and different theoretical models describing its internal structure are presented. This work also contains description of amplitude analysis of B-hadron decays procedure in problem of studying exotic multiquark states in ATLAS experiment.

In this work the Abrasion-Ablation Monte Carlo for Colliders model with and without MST-clustering was employed to characterise the momentum distribution of produced spectator fragments. The simulation results suggest that pre-equilibrium fragmentation with accounting for Coulomb interaction between charged spectator fragments lead to an increase of their mean transverse momentum ({{p}_{T}}), bringing the calculations closer to experimental data. The pseudorapidity distributions of H, He, Li spectator fragments from 3.26(A) GeV (^{{124}})XeВ collisions at the BM@N were calculated.

NOvA is an accelerator-based neutrino oscillation experiment. Using Fermilab’s Megawatt-capable NuMI beam and two functionally identical tracking calorimeter detectors, muon (anti)neutrino disappearance and electron (anti)neutrino appearance are studied. Accurate energy estimation is vital to make good measurements of oscillation parameters, since oscillations are a function of neutrino energy. NOvA has specialized estimators for both muon-like and electron-like neutrino events. In this paper, the latest 3-Flavor analysis estimators will be presented.