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Pionium Intermediate State in ({K^{+}topi^{0}pi^{0}pi^{0}e^{+}nu}) Decay ({K^{+}topi^{0}pi^{0}pi^{0}e^{+}nu})衰变的中间态
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602471
E. K. Karkaryan
{"title":"Pionium Intermediate State in ({K^{+}topi^{0}pi^{0}pi^{0}e^{+}nu}) Decay","authors":"E. K. Karkaryan","doi":"10.1134/S1063778825602471","DOIUrl":"10.1134/S1063778825602471","url":null,"abstract":"<p>The <span>(K^{+}to A_{2pi}pi^{0}e^{+}nu)</span> process with subsequent <span>(A_{2pi}topi^{0}pi^{0})</span> decay is considered. We estimate the branching ratio of the <span>(K^{+}to A_{2pi}pi^{0}e^{+}nu)</span> to <span>(K^{+}topi^{0}pi^{0}pi^{0}e^{+}nu)</span> by means of the phase volume analysis. Other possible intermediate resonances are discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S354 - S357"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Peculiarities of Identified Charged Hadron Production in Bi ({+}) Bi Collisions at the Energy ({sqrt{s}_{NN}=9.2}) GeV 能量为({sqrt{s}_{NN}=9.2}) GeV的Bi ({+})碰撞中已识别带电强子产生的特性分析
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602367
D. Larionova, Y. Berdnikov, D. Kotov
{"title":"Analysis of Peculiarities of Identified Charged Hadron Production in Bi ({+}) Bi Collisions at the Energy ({sqrt{s}_{NN}=9.2}) GeV","authors":"D. Larionova,&nbsp;Y. Berdnikov,&nbsp;D. Kotov","doi":"10.1134/S1063778825602367","DOIUrl":"10.1134/S1063778825602367","url":null,"abstract":"<p>The identified charged hadron (<span>(pi^{pm})</span>, <span>(K^{pm})</span>, <span>(p)</span>, <span>(bar{p})</span>) invariant spectra obtained using hydrodynamic version of UrQMD model simulations in different centrality classes of Bi <span>(+)</span> Bi collisions at the energy of <span>(sqrt{s_{NN}}=9.2)</span> GeV are presented. The spectra are analyzed using the Blast-Wave relativistic hydrodynamics model to extract the kinetic freeze-out temperature and average radial flow velocity. In addition, the ratios of antiproton to proton yields are used to estimate the baryon chemical potential. The study focuses on developing a methodology to extract thermodynamic parameters from identified hadron spectra, which is important for assessing the sensitivity of the MPD experiment at NICA to measurements of freeze-out and phase transition conditions. The applicability of the proposed approach for future experimental data and its relevance for exploring the nuclear matter phase diagram are also discussed.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S381 - S385"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Neutral Meson and Direct Photon Measurements with ALICE at the LHC 在大型强子对撞机上用ALICE测量中性介子和直接光子
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602276
D. A. Averyanov
{"title":"Neutral Meson and Direct Photon Measurements with ALICE at the LHC","authors":"D. A. Averyanov","doi":"10.1134/S1063778825602276","DOIUrl":"10.1134/S1063778825602276","url":null,"abstract":"<p>The ALICE experiment at the LHC is dedicated to the study of the hot and dense medium produced in ultrarelativistic heavy-ion collisions. Direct photons provide an excellent tool for testing QCD predictions, and serve as a valuable source of information about thermodynamic properties of the hot matter created in nucleus–nucleus collisions. Electromagnetic decays of neutral mesons produce dominant background for the direct photon and dielectron studies and should be measured with high accuracy. Furthermore, spectra of light neutral mesons provide excellent possibility to probe with high precision the parton structure of colliding nucleons and parton energy loss in hot medium. We report recent results from ALICE on the direct photon and neutral meson measurements in <span>(pp)</span>, <span>(p)</span>–Pb and Pb–Pb collisions at several energies together with the model calculations.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S292 - S299"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cosmic Ray Acceleration and Scattering in a 3D MHD Model of Compact Massive Star Clusters 致密大质量星团的三维MHD模型中的宇宙射线加速和散射
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602008
M. E. Kalyashova, A. M. Bykov, D. V. Badmaev
{"title":"Cosmic Ray Acceleration and Scattering in a 3D MHD Model of Compact Massive Star Clusters","authors":"M. E. Kalyashova,&nbsp;A. M. Bykov,&nbsp;D. V. Badmaev","doi":"10.1134/S1063778825602008","DOIUrl":"10.1134/S1063778825602008","url":null,"abstract":"<p>Compact young massive star clusters (YMSCs) contain dozens of O-, B-, and WR-type stars with powerful, fast winds within a radius of <span>({sim}1)</span> pc. In the turbulent environment of such clusters, particle acceleration by ensembles of shock waves and compression/rarefaction waves is possible. This work investigates the propagation and acceleration of particles in YMSCs using three-dimensional magnetohydrodynamic (MHD) simulations with the open source code PLUTO and its built-in module for solving the equations of motion for test charged particles. It is shown that in the cluster core, near the termination shocks of O-star winds, as well as at the collective wind termination shock, protons are accelerated to energies <span>({gtrsim}100)</span> TeV. The spatial and energy distributions of the particles are investigated.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S330 - S334"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Refining the Spectral Form Factor for Rotating BTZ Black Hole 改进旋转BTZ黑洞的光谱形状因子
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602264
Dmitry S. Ageev, Vasilii V. Pushkarev, Anastasia N. Zueva
{"title":"Refining the Spectral Form Factor for Rotating BTZ Black Hole","authors":"Dmitry S. Ageev,&nbsp;Vasilii V. Pushkarev,&nbsp;Anastasia N. Zueva","doi":"10.1134/S1063778825602264","DOIUrl":"10.1134/S1063778825602264","url":null,"abstract":"<p>In this note, we explore a recent proposal on the chaotic behavior of the scalar field in black hole backgrounds. We study details of the spectral form factor of scalar field normal modes corresponding to the rotating BTZ black hole background. We consider the effect of non-zero field mass in its interplay between cutoff parameters and non-zero angular velocity. Besides the canonical spectral form factor, we consider its complex-valued generalizations (generalized spectral form factors) which captures finer details via taking into account higher-level correlations. The three-level generalization of the spectral form factor is calculated showing discrepancies with the RMT result.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S305 - S311"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Experimental Observation of ({a_{0}(1710)}): Long Awaited from Regge Approach ({a_{0}(1710)})的实验观测：期待已久的Regge方法
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602161
S. S. Afonin
{"title":"The Experimental Observation of ({a_{0}(1710)}): Long Awaited from Regge Approach","authors":"S. S. Afonin","doi":"10.1134/S1063778825602161","DOIUrl":"10.1134/S1063778825602161","url":null,"abstract":"<p>Recently, the BABAR (in 2021), BESIII (in 2022), and LHCb (in 2023) Collaborations reported the observation of the <span>(a_{0}(1710))</span> resonance. This has sparked a lively debate in the literature about the nature of this possible isospin partner of <span>(f_{0}(1710))</span>, since the latter has long been regarded as the main candidate for the lightest glueball. We highlight the clear prediction of <span>(a_{0}(1710))</span> in 2007 within the Regge approach using the observed hydrogen-like degeneracy in the spectrum of light mesons. Our reanalysis of the data used shows that the prediction was reliable and thus indicates that <span>(a_{0}(1710))</span> and <span>(f_{0}(1710))</span> are conventional quark–antiquark states.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S320 - S324"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mass Spectrum of Heavy Tetraquarks in Variational Approach 变分方法中重四夸克的质谱
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602215
A. V. Eskin, A. P. Martynenko, F. A. Martynenko
{"title":"Mass Spectrum of Heavy Tetraquarks in Variational Approach","authors":"A. V. Eskin,&nbsp;A. P. Martynenko,&nbsp;F. A. Martynenko","doi":"10.1134/S1063778825602215","DOIUrl":"10.1134/S1063778825602215","url":null,"abstract":"<p>Within the framework of the quark model and variational method the bound states of four heavy quarks (tetraquarks) are investigated. The basis variational wave functions are chosen in the Gaussian form. Matrix elements of the Hamiltonian are calculated analytically. Numerical calculation of the energy levels of tetraquarks is performed using a program in the Matlab system. Hyperfine structure of the spectrum is calculated. To increase the accuracy of the calculation, relativistic corrections are taken into account.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 3","pages":"S312 - S319"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Triply and Fully Heavy Tetraquarks in the Relativistic Quark Model 相对论夸克模型中的三重和全重四夸克
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602355
V. O. Galkin, E. M. Savchenko
{"title":"Triply and Fully Heavy Tetraquarks in the Relativistic Quark Model","authors":"V. O. Galkin,&nbsp;E. M. Savchenko","doi":"10.1134/S1063778825602355","DOIUrl":"10.1134/S1063778825602355","url":null,"abstract":"<p>Mass spectra of triply and fully heavy tetraquarks were calculated within the relativistic quark model, based on the quasipotential approach and QCD. A tetraquark is considered in the framework of the diquark–antidiquark picture as a bound state of a diquark and an antidiquark which are assumed to be in a ground state. Diquarks are treated as color triplet states. Calculations take into account relativistic effects and finite size of diquarks. Obtained results are compared with the strong fall–apart decay thresholds into a pair of mesons. Recent data on observations of resonances in charmonium pair production are discussed. Tetraquark states that are most promising candidates for experimental searches are identified.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S415 - S422"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Open and Hidden Strangeness in Central ({A+A}) Collisions: Ratios of the Average Transverse Energy Density for ({varphi}) Mesons and (Omega) Hyperons in the Range ({sqrt{s_{{NN}}}=39}) GeV–({2.76}) TeV 中心({A+A})碰撞中的开放奇异性和隐藏奇异性：({sqrt{s_{{NN}}}=39}) GeV - ({2.76}) TeV范围内({varphi})介子和(Omega)超子的平均横向能量密度比
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S106377882560246X
Olga Shaposhnikova, Aleksandra Marova, Grigori Feofilov
{"title":"Open and Hidden Strangeness in Central ({A+A}) Collisions: Ratios of the Average Transverse Energy Density for ({varphi}) Mesons and (Omega) Hyperons in the Range ({sqrt{s_{{NN}}}=39}) GeV–({2.76}) TeV","authors":"Olga Shaposhnikova,&nbsp;Aleksandra Marova,&nbsp;Grigori Feofilov","doi":"10.1134/S106377882560246X","DOIUrl":"10.1134/S106377882560246X","url":null,"abstract":"<p>We present the results of estimates for the average transverse energy density <span>(langle dE_{bot}/dyrangle)</span> in the central rapidity region for <span>(varphi)</span> mesons (1020) and <span>({Omega})</span> hyperons <span>(left({Omega}^{-}+bar{{Omega}}^{+}right))</span>, obtained from our analysis of available data on identified particle spectra in the most central Au <span>(+)</span> Au and Pb <span>(+)</span> Pb collisions within the energy range <span>(sqrt{s_{NN}}=39)</span> GeV–<span>(2.76)</span> TeV. The strange particle density at midrapidity was taken from the published data. The missing information on the mean <span>(p_{bot})</span>, required for the transverse mass calculation, was obtained in this work by integrating the relevant spectra and using two types of approximation functions (Levi and Blast wave). It is found that the dependencies of <span>(langle dE_{bot}/dyrangle)</span> on <span>(sqrt{s_{NN}})</span> for <span>(varphi)</span> mesons and <span>({Omega})</span> hyperons are well approximated by power-law functions, with similar values of exponents <span>(n)</span> that agree within statistical uncertainties. Accordingly, the ratios of <span>(langle dE_{bot}/dyrangle)</span> for <span>(varphi)</span> mesons and <span>({Omega})</span> hyperons exhibit no dependence on <span>(sqrt{s_{NN}})</span> across a wide range of nucleus–nucleus collision energies. We discuss the possible interpretations of these results within two models: (i) the generalized Multipomeron Exchange Model and (ii) Statistical Hadron Gas Model.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S366 - S373"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Canonical Quantization of Fields in the Schwarzschild Metric 史瓦西度规中场的正则量子化
IF 0.4 4区 物理与天体物理
Physics of Atomic Nuclei Pub Date : 2026-04-01 DOI: 10.1134/S1063778825602409
Vadim Egorov, Mikhail Smolyakov, Igor Volobuev
{"title":"Canonical Quantization of Fields in the Schwarzschild Metric","authors":"Vadim Egorov,&nbsp;Mikhail Smolyakov,&nbsp;Igor Volobuev","doi":"10.1134/S1063778825602409","DOIUrl":"10.1134/S1063778825602409","url":null,"abstract":"<p>We discuss the procedure of canonical quantization of free scalar, spinor and electromagnetic fields above the horizon of an eternal Schwarzschild black hole focusing on the case of electromagnetic field. In the resulting quantum theories, the canonical commutation relations are satisfied, and the Hamiltonians have the standard diagonal form without pathologies. The only difference from the case of Minkowski spacetime is the doubling of the number of quantum states of infinite motion, which is a consequence of the different topological structures of the Schwarzschild and Minkowski spacetimes.</p>","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"88 4","pages":"S444 - S449"},"PeriodicalIF":0.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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