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Z Boson Contribution into the Muon Pair Production in Proton–Proton Collisions
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S002713492470156X
E. K. Karkaryan
{"title":"Z Boson Contribution into the Muon Pair Production in Proton–Proton Collisions","authors":"E. K. Karkaryan","doi":"10.3103/S002713492470156X","DOIUrl":"10.3103/S002713492470156X","url":null,"abstract":"<p>We consider the dimuon production in proton–proton collision which happen at LHC via photon and <span>(Z)</span> fusion. Analytical formulas for the cross section of the reaction <span>(ppto p(gamma Z)Xto pmumu X)</span> are provided and the comparison with the <span>(ppto p(gammagamma)Xto pmumu X)</span> process is performed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"154 - 157"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455508","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
Electron Parton Distribution Functions
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701637
U. E. Voznaya, A. B. Arbuzov
{"title":"Electron Parton Distribution Functions","authors":"U. E. Voznaya,&nbsp;A. B. Arbuzov","doi":"10.3103/S0027134924701637","DOIUrl":"10.3103/S0027134924701637","url":null,"abstract":"<p>PDFs of <span>(D_{ee})</span> and <span>(D_{egamma})</span> types used for calculation of radiative corrections to electron energy spectrum in muon decay up to the order <span>(mathcal{O}(alpha^{3}L^{2}))</span> are presented. PDF approach is used to calculate radiative corrections.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"184 - 187"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455513","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
Prompt Photon Production in the Subprocess of Bremsstrahlung of Proton–Proton Collisions at (sqrt{{s}}textbf{= 10}) GeV(NICA) Energies
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700735
M. R. Alizada
{"title":"Prompt Photon Production in the Subprocess of Bremsstrahlung of Proton–Proton Collisions at (sqrt{{s}}textbf{= 10}) GeV(NICA) Energies","authors":"M. R. Alizada","doi":"10.3103/S0027134924700735","DOIUrl":"10.3103/S0027134924700735","url":null,"abstract":"<p>The dependence of differential cross section of bremsstrahlung process on the energy of the colliding protons <span>(sqrt{s})</span> , the transverse momentum <span>(p_{T})</span>, the cosine of the scattering angle <span>(cos(theta))</span>, the rapidity <span>(y)</span> of photon and <span>(x_{T})</span> has been investigated at energies <span>(sqrt{s}=10)</span> GeV. The ratio of the differential cross section of bremsstrahlung to the sum of the differential cross sections of Compton scattering of a quark–gluon, annihilation of a quark-antiquark pair, and bremsstrahlung is 0.03<span>(%)</span>.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"39 - 41"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455584","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
Latest Results and Precision Measurements from the NA62 Experiment
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700905
D. Baigarashev
{"title":"Latest Results and Precision Measurements from the NA62 Experiment","authors":"D. Baigarashev","doi":"10.3103/S0027134924700905","DOIUrl":"10.3103/S0027134924700905","url":null,"abstract":"<p>The NA62 experiment at CERN collected the world’s largest dataset of charged kaon decays in 2016–2018, leading to the first measurement of the branching ratio of the ultra-rare <span>(K^{+}rightarrowpi^{+}nubar{nu})</span> decay, based on 20 candidates, and presented in 2021. In this talk the NA62 experiment reports new results from analyses of <span>(K^{+}rightarrowpi^{+}mu^{+}mu^{-})</span> and <span>(K^{+}rightarrowpi^{+}gammagamma)</span> decays, using a data sample recorded in 2017–2018. The <span>(K^{+}rightarrowpi^{+}mu^{+}mu^{-})</span>—sample comprises about 27k signal events with negligible background contamination, and the analysis results presented include the most precise determination of the branching ratio and the form factor. The <span>(K^{+}rightarrowpi^{+}gammagamma)</span> sample contains about 4k signal events with 10<span>(%)</span> background contamination, and the analysis improves the precision of the branching ratio measurement by a factor of 3 with respect to the previous measurements. The NA62 experiment can also be run as a ‘‘beam-dump experiment’’ by removing the kaon production target and moving the upstream collimators into a ‘‘closed’’ position. More than <span>(10^{17})</span> protons on target have been collected in this way during a week-long data-taking campaign. We report on new results from analysis of this data, with a particular emphasis on Dark Photon and Axion-like particle Models.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"122 - 128"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455441","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
Correlations of the Velocities and of the Vorticities for Nucleons and Pions in PHSD Model
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701571
E. E. Kolomeitsev, N. V. Kolomoyets, O. V. Teryaev, N. S. Tsegelnik, V. Voronyuk
{"title":"Correlations of the Velocities and of the Vorticities for Nucleons and Pions in PHSD Model","authors":"E. E. Kolomeitsev,&nbsp;N. V. Kolomoyets,&nbsp;O. V. Teryaev,&nbsp;N. S. Tsegelnik,&nbsp;V. Voronyuk","doi":"10.3103/S0027134924701571","DOIUrl":"10.3103/S0027134924701571","url":null,"abstract":"<p>The correlations of the velocities and of the vorticities for pions and nucleons are investigated in frames of the PHSD model for Au+Au collisions at <span>(sqrt{s_{NN}}=7.8)</span> GeV and fixed impact parameter <span>(b=7.5)</span> fm. The different behavior of correlations for these kinematic quantities is observed. It is shown that after the time of the separation of the nuclei this difference is due to the ‘microscopic’ Hubble flow. However, for earlier times the reasons are more complicated.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"158 - 161"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455507","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
Measurements of the Absolute Reactor Antineutrino Counting Rates in the DANSS Experiment
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701716
N. A. Skrobova
{"title":"Measurements of the Absolute Reactor Antineutrino Counting Rates in the DANSS Experiment","authors":"N. A. Skrobova","doi":"10.3103/S0027134924701716","DOIUrl":"10.3103/S0027134924701716","url":null,"abstract":"<p>DANSS is a one cubic meter highly segmented solid scintillator detector placed under a 3.1 GW industrial reactor at the Kalinin NPP (Russia) on a movable platform. The distance from the reactor core center is varied from 10.9 to 12.9 m on-line. The inverse beta decay (IBD) process is used to detect antineutrinos. DANSS detects about 5000 IBD events per day with the background from cosmic muons at the level of few percent. We have also measured the reactor power using the IBD event rate during more than 6 years with the statistical accuracy 1.5<span>(%)</span> in 2 days and with the relative systematic uncertainty of about 0.5<span>(%)</span>. New results on the search for sterile neutrino based on 7.7 million of antineutrino events are presented.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"239 - 242"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455553","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
Luminosity Determination by ALICE during LHC Run 3
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700693
A. A. Furs, on behalf of the ALICE Collaboration
{"title":"Luminosity Determination by ALICE during LHC Run 3","authors":"A. A. Furs,&nbsp;on behalf of the ALICE Collaboration","doi":"10.3103/S0027134924700693","DOIUrl":"10.3103/S0027134924700693","url":null,"abstract":"<p>Luminosity is a crucial component for measuring the cross-section of physical processes. The ALICE collaboration uses dedicated calibration data, the van der Meer (vdM) scans, to normalize luminosity detectors’s count rate to well-known (visible) cross sections. The needed information comes from LHC instrumentation and ALICE detectors. In the LHC Run 2, three trigger detectors (T0—Cherenkov detector, V0—scintillator, and ZDC—zero degree calirimeter) participated in the luminosity analysis of different colliding systems: pp, p–Pb, and Pb–Pb. During the LHC Long Shutdown 2, a new fast interacting trigger (FIT) detector was integrated with the ALICE setup. This paper gives a preliminary overview of FIT’s performance as the new ALICE luminometer and trigger detector. In addition to the latest data collected during the first pp collisions of Run 3, LHC Run 2 luminosity results are shown and discussed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"12 - 19"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455573","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
Next-to-Leading Approximation of BFKL for Dijet Production with Large Rapidity Separation between Jets at the LHC
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700966
A. Iu. Egorov, V. T. Kim, V. A. Murzin, V. A. Oreshkin
{"title":"Next-to-Leading Approximation of BFKL for Dijet Production with Large Rapidity Separation between Jets at the LHC","authors":"A. Iu. Egorov,&nbsp;V. T. Kim,&nbsp;V. A. Murzin,&nbsp;V. A. Oreshkin","doi":"10.3103/S0027134924700966","DOIUrl":"10.3103/S0027134924700966","url":null,"abstract":"<p>New evidence of the manifestation of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) evolution effects is obtained by comparison of the calculation of Meueller–Navelet (MN) dijet production cross section in the next-to-leading logarithmic approximation of the BFKL evolution with the recent CMS measurement. Here the MN dijet is the maximally separated in rapidity pair of jets with both jets taken among jets with transverse momentum above some chosen <span>(p_{perpmin})</span> in an event.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"148 - 153"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455509","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
New Resonances in (mathbf{J/}{psi}mathbf{J/}{psi}) Mass Spectrum at CMS
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701546
N. Petrov, on behalf of the CMS Collaboration
{"title":"New Resonances in (mathbf{J/}{psi}mathbf{J/}{psi}) Mass Spectrum at CMS","authors":"N. Petrov,&nbsp;on behalf of the CMS Collaboration","doi":"10.3103/S0027134924701546","DOIUrl":"10.3103/S0027134924701546","url":null,"abstract":"<p>A search is reported for near-threshold resonances decaying to <span>(textrm{J}/psitextrm{J}/psi)</span>, using the 13 TeV proton–proton collision data collected by the CMS experiment. Two structures are observed at masses of about 6550 and 6930 MeV with local significance exceeding 5 standard deviations. The second one is consistent with the X(6900) previously reported by the LHCb experiment. Evidence for a third structure is found at about 7300 MeV with a local significance of 4 standard deviations. Models employing interference between these states were tested and can provide a better description of the spectrum between the resonances.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"78 - 81"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455548","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
Feasibility Studies for the Measurements of Open Heavy-Flavor Mesons with ALICE-3 at the HL-LHC
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S002713492470070X
M. V. Malaev, V. G. Riabov
{"title":"Feasibility Studies for the Measurements of Open Heavy-Flavor Mesons with ALICE-3 at the HL-LHC","authors":"M. V. Malaev,&nbsp;V. G. Riabov","doi":"10.3103/S002713492470070X","DOIUrl":"10.3103/S002713492470070X","url":null,"abstract":"<p>ALICE-3 is the future experiment based on the novel silicon technologies which is designed as a very compact, very precise and very fast spectrometer with a wide rapidity coverage. The detector is designed to work with high luminosities not reachable for the current ALICE experiment. Considerable increase in collected statistics coupled with improvement in precision of measurements and available acceptance will give opportunity for the areas of studies not covered by physics program of the ALICE collaboration before or highly improve and differentiate results obtained before. One of such areas of studies is precise, differential analysis of open charm production in wide transverse and rapidity ranges in different colliding systems at maximum LHC energies. In this contribution we present results of feasibility studies for reconstruction of neutral D-mesons (ground and excited states) in decay channels with photons in the final state in pp, p-Pb, and Pb-Pb collisions at LHC energies using the apparatus of the future ALICE-3 experiment. We discuss possible advantages of the usage of electromagnetic calorimeter for high transverse momentum measurements, estimate signal to background ratios within the approach and estimate the required statistics needed for precise measurements at the highest reachable transverse momentum.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"20 - 24"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455576","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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