Physics of Particles and Nuclei Letters最新文献

{"title":"Abelian and Monopole Dominance in SU(3) Gluodynamics and Gribov Copy Effects","authors":"I. Kudrov,&nbsp;V. Bornyakov","doi":"10.1134/S1547477124701930","DOIUrl":"10.1134/S1547477124701930","url":null,"abstract":"<p>We continue our study of the Gribov copies effects in the Maximal Abelian gauge in lattice <span>(SU(3))</span> gluodynamics. Our computations were completed for four values of the lattice spacing with physical lattice size <span>(L approx 2)</span> fm. It is demonstrated that when one uses the effective simulated annealing algorithm to fix the gauge the obtained Gribov copies produce low abelian string tension which is below 90% of the physical value independent of the lattice spacing. These Gribov copies produce also low value (about 86%) for the monopole string tension. It is further shown that in case of less effective relaxation algorithm it is possible to obtain Gribov copies which produce both Abelian and monopole string tension in good agreement with the physical one.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"112 - 116"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of R at the KEDR Detector","authors":"V. V. Anashin,&nbsp;O. V. Anchugov,&nbsp;K. V. Astrelina,&nbsp;V. M. Aulchenko,&nbsp;V. V. Balakin,&nbsp;E. M. Baldin,&nbsp;G. N. Baranov,&nbsp;A. K. Barladyan,&nbsp;A. Yu. Barnyakov,&nbsp;M. Yu. Barnyakov,&nbsp;I. Yu. Basok,&nbsp;E. A. Bekhtenev,&nbsp;O. V. Belikov,&nbsp;D. E. Berkaev,&nbsp;A. E. Blinov,&nbsp;V. E. Blinov,&nbsp;A. V. Bobrov,&nbsp;V. S. Bobrovnikov,&nbsp;A. V. Bogomyagkov,&nbsp;D. Yu. Bolkhovityanov,&nbsp;A. E. Bondar,&nbsp;V. M. Borin,&nbsp;A. R. Buzykaev,&nbsp;V. L. Dorokhov,&nbsp;D. V. Dorokhova,&nbsp;F. A. Emanov,&nbsp;D. N. Grigoriev,&nbsp;V. V. Kaminskiy,&nbsp;S. E. Karnaev,&nbsp;G. V. Karpov,&nbsp;K. Yu. Karukina,&nbsp;P. V. Kasyanenko,&nbsp;A. A. Katcin,&nbsp;T. A. Kharlamova,&nbsp;V. A. Kiselev,&nbsp;A. A. Kovalenko,&nbsp;E. V. Kozyrev,&nbsp;A. A. Krasnov,&nbsp;E. A. Kravchenko,&nbsp;V. N. Kudryavtsev,&nbsp;V. F. Kulikov,&nbsp;G. Ya. Kurkin,&nbsp;I. A. Kuyanov,&nbsp;D. A. Kyshtymov,&nbsp;N. N. Lebedev,&nbsp;E. B. Levichev,&nbsp;P. V. Logachev,&nbsp;D. A. Maksimov,&nbsp;V. M. Malyshev,&nbsp;T. V. Maltsev,&nbsp;R. Z. Mamutov,&nbsp;A. L. Maslennikov,&nbsp;O. I. Meshkov,&nbsp;I. I. Morozov,&nbsp;I. A. Morozov,&nbsp;A. A. Murasev,&nbsp;S. A. Nikitin,&nbsp;I. B. Nikolaev,&nbsp;I. N. Okunev,&nbsp;S. B. Oreshkin,&nbsp;A. A. Osipov,&nbsp;I. V. Ovtin,&nbsp;A. V. Pavlenko,&nbsp;S. V. Peleganchuk,&nbsp;K. G. Petrukhin,&nbsp;P. A. Piminov,&nbsp;A. V. Polyanskiy,&nbsp;V. G. Prisekin,&nbsp;O. L. Rezanova,&nbsp;A. A. Ruban,&nbsp;G. A. Savinov,&nbsp;D. V. Senkov,&nbsp;A. G. Shamov,&nbsp;L. I. Shekhtman,&nbsp;D. A. Shvedov,&nbsp;B. A. Shwartz,&nbsp;E. A. Simonov,&nbsp;S. V. Sinyatkin,&nbsp;M. A. Skamarokha,&nbsp;A. N. Skrinsky,&nbsp;A. V. Sokolov,&nbsp;E. V. Starostina,&nbsp;D. P. Sukhanov,&nbsp;A. M. Sukharev,&nbsp;A. A. Talyshev,&nbsp;V. A. Tayursky,&nbsp;V. I. Telnov,&nbsp;Yu. A. Tikhonov,&nbsp;K. Yu. Todyshev,&nbsp;Yu. V. Usov,&nbsp;A. I. Vorobiov,&nbsp;V. N. Zhilich,&nbsp;A. A. Zhukov,&nbsp;V. V. Zhulanov,&nbsp;A. N. Zhuravlev,&nbsp;D. A. Zubkov","doi":"10.1134/S1547477124701978","DOIUrl":"10.1134/S1547477124701978","url":null,"abstract":"<p>The paper is focused on the precise measurements of the total cross section for <span>({{e}^{ + }}{{e}^{ - }})</span> annihilation into hadronic final states at the VEPP-4M collider in Novosibirsk. The KEDR collaboration has published the <i>R</i> values on 22 points in the center-of-mass energy range from 1.84 to 3.72 GeV with the accuracy better than in previous measurements. The energy range between 4.56 and 6.96 GeV was scanned at 17 points with integrated luminosity of about 13.7 pb<span>(^{{ - 1}})</span> and preliminary results of the analysis are presented.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"137 - 141"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photon-Exchange Dominance over Pomeron in Forward Rapidity Gap Events in p-Pb Collisions at LHC","authors":"V. T. Kim,&nbsp;E. V. Kuznetsova,&nbsp;D. E. Sosnov","doi":"10.1134/S1547477124702133","DOIUrl":"10.1134/S1547477124702133","url":null,"abstract":"<p>The forward rapidity gap spectra from proton-lead collisions for the topologies with lead and proton dissociation. The analysis was performed at a nucleon-nucleon center-of-mass energy of 8.16 TeV with the CMS detector at LHC. The previous measurements was done by HELIOS Collaboration at <span>(sqrt {{{s}_{{NN}}}} = 29.1)</span> GeV i.e. almost 300 times lower. For the topology with the lead dissociation the EPOS-LHC and QGSJET II generator predictions are a factor of two and four, respectively, below the CMS data, but the models give a reasonable description of the shape of the spectrum. The shape of HIJING generator differs by both, energy and shape, to the CMS data. For the proton dissociation topology the electromagnetic contribution exceeds strong interaction diffraction. This measurement changes relation between the sources of the diffraction processes with nuclei: strong interaction via Pomeron and electromagnetic one with photon-exchange. Rapidity gap observable in pA measured by CMS shows for the first time that electromagnetic contribution on lead nucleus at the LHC energy exceeds strong interaction diffraction. The obtained data may be of significant help in understanding the high energy limit of QCD and modeling cosmic ray air showers.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"219 - 223"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Combined Neutron and Proton Beam Radiation Exposure on the Pool of Breast Cancer Stem Cells In Vitro","authors":"I. A. Zamulaeva,&nbsp;O. N. Matchuk,&nbsp;K. A. Churyukina,&nbsp;V. O. Saburov,&nbsp;S. N. Koryakin,&nbsp;S. A. Ivanov,&nbsp;A. D. Kaprin,&nbsp;E. A. Krasavin","doi":"10.1134/S1547477124701887","DOIUrl":"10.1134/S1547477124701887","url":null,"abstract":"<p>The effect is studied of single and combined proton and neutron radiation on the population of cancer stem cells (CSCs), which is the most resistant fraction of tumor cells to damaging factors, and, therefore, plays a key role in metastasis and cancer recurrence after treatment. The purpose of the study is to search for conditions for synergistic interaction of these radiations when irradiating breast cancer cells of two stable lines in vitro. It has been found that the number of CD44⁺CD24^–/low CSCs decreases after combined irradiation at a total equieffective dose of 4.0 Gy compared with the control, in contrast to the effects of γ-radiation, which leads to an increase in the number of CSCs. A synergistic decrease in the CSC pool has been shown for the combined action of neutrons and protons if the contribution of the radiations to the total dose was the same and the time between irradiation sessions did not exceed 4 h. These results are interesting for the further development of radiation therapy concerning the prospects for using new types of radiation to eliminate CSCs.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"77 - 89"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contribution of QED Compton Scattering Subprocess to Prompt Photon Production in Collisions of Longitudinally Polarized Protons at NICA Energies","authors":"M. R. Alizada,&nbsp;A. I. Ahmadov,&nbsp;A. B. Arbuzov","doi":"10.1134/S1547477124701802","DOIUrl":"10.1134/S1547477124701802","url":null,"abstract":"<p>Contributions of the subprocesses of mixed chromo-electrodynamic <span>(qg to qgamma )</span> and pure electrodynamic Compton scattering <span>(qgamma to qgamma )</span> to the process of prompt photon production in the collision of longitudinal polarized protons are investigated. The dependence of the differential cross section on the sum of energies <span>(sqrt s )</span> of colliding protons, transverse momentum <span>({{p}_{{text{T}}}})</span> of photons, the cosine of scattering angle <span>(cos (theta ))</span>, and pseudorapidity of photons <span>(y)</span> is studied. It is shown that the polarization of initial particles strongly affects the total cross section and the differential distributions. The contribution of a purely electrodynamic Compton subprocess depends on the polarization, and for many ranges of kinematics, it is numerically important in the differential cross section of the process of prompt photon production at energies of the NICA accelerator and, accordingly, should be taken into account in the simulation and analysis of experimental data. The double-spin asymmetry of the prompt photon production process is calculated. It is shown that the contributions of subprocesses <span>(qg to qgamma )</span> and <span>(qgamma to qgamma )</span> to the double spin asymmetry strongly depend on the polarization of initial particles.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"10 - 17"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micromegas-Based Central Tracker for the SPD Experiment","authors":"A. Gongadze,&nbsp;D. Dedovich,&nbsp;N. Koviazina,&nbsp;I. Liashko","doi":"10.1134/S154747712470184X","DOIUrl":"10.1134/S154747712470184X","url":null,"abstract":"<p>SPD (Spin Physics Detector) is a universal experimental setup that is planned to be installed at the NICA collider under construction. In the first phase of the experiment, the vertex detector will not be used, which will lead to a significant degradation of the momentum resolution and reduce the efficiency of track recognition and secondary vertex reconstruction. To minimize this effect, we propose to supplement the main track system with a Micromegas-based detector located as close as possible to the beam interaction region.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"32 - 44"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the ϕπ0-System Production in the Charge Exchange Reaction of the 29 GeV Pion Beam with the Berrilium Target of the VES Setup","authors":"V. Dorofeev,&nbsp;V. G. Gotman,&nbsp;A. V. Ivashin,&nbsp;I. A. Kachaev,&nbsp;Yu. A. Khokhlov,&nbsp;M. S. Kholodenko,&nbsp;V. I. Lisin,&nbsp;V. D. Matveev,&nbsp;E. V. Nazarov,&nbsp;A. N. Plekhanov,&nbsp;D. I. Ryabchikov,&nbsp;A. A. Shumakov,&nbsp;V. P. Sugonyaev,&nbsp;A. M. Zaitsev","doi":"10.1134/S1547477124701966","DOIUrl":"10.1134/S1547477124701966","url":null,"abstract":"<p>We observed <span>(2403 pm 98)</span> events of <span>({{pi }^{ - }} + Be to phi {{pi }^{0}} + A{text{*}})</span> reaction collected in exposition of the VES setup Be target by <span>(2.5 times {{10}^{{11}}})</span> <span>({{pi }^{ - }})</span>-mesons with the 29 GeV momentum. A –<span>(phi {{pi }^{0}})</span> production in a vector state is mostly observed with the recoil <span>(Delta (1232))</span> isobar in a process with <span>(pi )</span> exchange dominance. The <span>(phi {{pi }^{0}})</span> mass spectrum has a complicated shape.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"131 - 136"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cluster Structure of 209Bi","authors":"R. Khatun,&nbsp;D. R. Sarker,&nbsp;A. K. F. Haque,&nbsp;M. Nure Alam Abdullah","doi":"10.1134/S1547477124701796","DOIUrl":"10.1134/S1547477124701796","url":null,"abstract":"<p>We present the results of analyses of the <span>(alpha + {{,}^{{209}}}{text{Bi}})</span> elastic scattering for projectile energies <span>({{E}_{alpha }} = 19- 104)</span> MeV in terms of the single folded (SF) potential based on α-cluster and unclustered nucleonic configuration of ²⁰⁹Bi in the framework of the optical model (OM). The <span>(alpha {{{text{ - }}}^{{209}}}{text{Bi}})</span> potential is constructed by folding the α–α and α–<i>N</i> interactions using their density distributions. In a time-averaged picture, the number of nucleons making α-cluster has been found to be <span>(4{{A}_{alpha }} = 180)</span> and the number of unclustered nucleons as <span>({{A}_{{text{N}}}} = 29)</span>, which gives the renormalization factor equal to unity.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"1 - 9"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"({{B}_{s}} to D_{s}^{{(*)}}ell {{nu }_{ell }}) and ({{B}_{c}} to {{M}_{{bar {c}c}}}{kern 1pt} l{{nu }_{ell }}) Decays in Covariant Confined Quark Model","authors":"A. Issadykov,&nbsp;M. Ilyassov","doi":"10.1134/S1547477124701917","DOIUrl":"10.1134/S1547477124701917","url":null,"abstract":"<p>In this paper we showed the theoretical predictions within the covariant quark model of branching ratios <span>({{B}_{s}} to D_{s}^{{(*)}}ell {{nu }_{ell }})</span> and <span>({{B}_{c}} to {{M}_{{bar {c}c}}}{kern 1pt} l{{nu }_{ell }})</span> decays. Our results for <span>({{B}_{s}} to D_{s}^{{(*)}}ell {{nu }_{ell }})</span> are in a good agreement with the data from the latest LHCb experiments as well as lattice quantum chromodynamics simulations. At the same time the theoretical predictions for the ratio <span>({{mathcal{R}}_{{J/psi }}})</span> are more than 2σ less than the experimental data. This may indicate on the possibility of New physics effects in this decay.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"100 - 104"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum to: On the Problem of Spontaneous Isotopic Symmetry Breaking in Nambu–Jona-Lasinio Models","authors":"M. N. Naydenov,&nbsp;M. V. Chizhov","doi":"10.1134/S1547477125010029","DOIUrl":"10.1134/S1547477125010029","url":null,"abstract":"","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"237 - 237"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}