S. V. Chekulaev
A5103533182- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- advanced mathematical theories
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Algorithms and Data Compression
- Advanced Data Storage Technologies
- Advanced Queuing Theory Analysis
- Nuclear reactor physics and engineering
- Probability and Risk Models
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
TRIUMF
2016-2025
Brandeis University
2023-2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
The University of Adelaide
2014-2023
University of Manchester
2023
University of Amsterdam
2020
National Institute for Subatomic Physics
2020
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2019
Siberian Branch of the Russian Academy of Sciences
2019
The D0 Collaboration reports on a search for the standard model top quark in pp¯ collisions at s=1.8TeV Fermilab Tevatron with an integrated luminosity of approximately 50pb−1. We have searched tt¯ production dilepton and single-lepton decay channels without tagging b-quark jets. observed 17 events expected background 3.8±0.6 events. probability upward fluctuation to produce signal is 2×10−6 (equivalent 4.6 deviations). kinematic properties excess are consistent decay. conclude that we...
The D0 Collaboration has performed a measurement of the top quark mass mt based on six candidate events for process tt¯→bW+b¯W−, where W bosons decay to eν or μν. This sample was collected during an exposure detector integrated luminosity 125pb−1 s=1.8TeVpp¯ collisions. We obtain mt=168.4±12.3(stat)±3.6(syst)GeV/c2, consistent with obtained using single-lepton events. Combination and dilepton results yields mt=172.0±7.5GeV/c2.Received 16 June...
We present a search for events consistent with the production and decay of squarks gluinos minimal supersymmetric standard model (MSSM) in D0 detector at Fermilab Tevatron $p\overline{p}$ collider. examined data containing large missing transverse energy three or more jets. observed no excess above expected yield from processes. For choice MSSM parameter values, we set lower limit 95% confidence level on mass gluino 144 GeV ${/c}^{2}$ all squark masses 212 equal masses.
We determine the top quark mass m_t using t-tbar pairs produced in D0 detector by \sqrt{s} = 1.8 TeV p-pbar collisions a 125 pb^-1 exposure at Fermilab Tevatron. make two constraint fit to -> b W^+bbar W^- final states with one W boson decaying q-qbar and other e-nu or mu-nu. Likelihood fits data yield m_t(l+jets) 173.3 +- 5.6 (stat) 5.5 (syst) GeV/c^2. When this result is combined an analysis of events which both bosons decay into leptons, we obtain 172.1 5.2 4.9 An alternate analysis,...
We present new results on the search for top quark in p¯p collisions at √s=1.8 TeV with an integrated luminosity of 13.5±1.6 pb–1. have considered t¯t production standard model using electron and muon dilepton decay channels ( t¯t→eμ+ jets, ee+ μμ+ jets) single-lepton t¯t→e+ jets μ+ without tagging b jets. From all we nine events expected background 3.8±0.9. If assume that excess is due to production, a mass 180 GeV/ c2, obtain cross section 8.2±5.1 pb.Received 7 November...
We have searched for evidence of top quark production in pp¯ collisions at √s =1.8 TeV using the D0 detector Fermilab Tevatron collider. For an integrated luminosity 15 pb−1, we report results a search tt¯ pairs decay modes tt¯→eμ+jets,ee+jets,e+jets, and μ+jets. From analyses these obtain lower limit on mass 131 GeV/c2 95% confidence level, assuming standard model branching fractions predicted cross section production. discuss properties event which expected backgrounds are small.Received 4...
We report on measurements inclusive cross sections times branching fractions into electrons for W and Z bosons produced in pp¯ collisions at s=1.8TeV. From an integrated luminosity of 84.5 pb−1 recorded 1994–1995 using the DØ detector Fermilab Tevatron, we determine σ(pp¯→W+X)×B(W→eν)=2310±10(stat)±50(syst)±100(lum)pb σ(pp¯→Z+X)×B(Z→ee)=221±3(stat)±4(syst)±10(lum)pb. these, derive σ(pp¯→W+X)×B(W→eν)/σ(pp¯→Z+X)×B(Z→ee)=10.43±0.15(stat)±0.20(syst)±0.10(NLO),...
We report a measurement of the inclusive muon and b-quark production cross sections in pp¯ collisions at s=1.8 TeV using D0 detector Fermilab Tevatron collider. The spectrum extends over kinematic range |yμ|<0.8 3.5<pTμ<60GeV/c, is well described by expected contributions from various known sources. section for |yb|<1.0 pTb>6GeV/c extracted, agrees with next-to-leading order QCD predictions within experimental theoretical uncertainties.Received 12 December...
We measure the top quark mass mt using tt¯ pairs produced in D0 detector by s=1.8TeVpp¯ collisions a 125pb−1 exposure at Fermilab Tevatron. make two constraint fit to tt¯→bW+b¯W− final states with one W decaying qq¯ and other eν or μν. Events are binned versus of probability for events be signal rather than background. Likelihood fits data yield mt=173.3±5.6(stat)±6.2(syst)GeV/c2.Received 11 March 1997DOI:https://doi.org/10.1103/PhysRevLett.79.1197©1997 American Physical Society
We report a measurement of the top quark mass using six candidate events for process $p\overline{p}\ensuremath{\rightarrow}t\overline{t}+\stackrel{\ensuremath{\rightarrow}}{X}{l}^{+}\ensuremath{\nu}{\mathrm{bl}}^{\ensuremath{-}}\overline{\ensuremath{\nu}}\overline{b}+X$, observed in D0 experiment at Fermilab $p\overline{p}$ collider. Using maximum likelihood fits to dynamics decays, we measure...
We present a search for charged Higgs bosons in decays of pair-produced top quarks using $109.2\ifmmode\pm\else\textpm\fi{}5.8{\mathrm{pb}}^{\ensuremath{-}1}$ data recorded from $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ by the D0 detector during 1992--1996 Fermilab Tevatron. No evidence is found production, and most parts $[{M}_{{H}^{+}},\mathrm{tan}\ensuremath{\beta}]$ parameter space where decay...
We present results on the search for top quark in pp\ifmmode\bar\else\textasciimacron\fi{} collisions at \ensuremath{\surd}s =1.8 TeV with an integrated luminosity of 13.5\ifmmode\pm\else\textpm\fi{}1.6 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$. have considered tt\ifmmode\bar\else\textasciimacron\fi{} production standard model using electron and muon dilepton decay channels (tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\mu}+jets, ee+jets,...
We present a search for pair produced top squarks, the supersymmetric partners of quark, using D0 detector at Fermilab Tevatron $p\overline{p}$ collider. consider scenario in which lighter two squarks ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{t}}_{1}$ decays with 100% branching fraction to charm quark and lightest neutralino \~{}\fi{}}{\ensuremath{\chi}}}_{1}^{0}$ yielding signal acollinear jets missing transverse energy. observe 3 events while we expect...
We report a new measurement of the pseudorapidity ( $\ensuremath{\eta}$) and transverse-energy ${E}_{T}$) dependence inclusive jet production cross section in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ using $95{\mathrm{pb}}^{\ensuremath{-}1}$ data collected with D0 detector Fermilab Tevatron. The differential ${d}^{2}\ensuremath{\sigma}/({\mathrm{dE}}_{T}d\ensuremath{\eta})$ is presented up to...
We report a search for effects of large extra spatial dimensions in pp collisions at center-of-mass energy 1.8 TeV with the D0 detector, using events containing pair electrons or photons. The data are good agreement expected background and do not exhibit evidence dimensions. set most restrictive lower limits to date, 95% C.L. on effective Planck scale between 1.0 1.4 several formalisms numbers
We report a new measurement of the cross section for production isolated photons with transverse energies ( ${E}_{T}^{\ensuremath{\gamma}}$) above 10 GeV and pseudorapidities $|\ensuremath{\eta}|<2.5$ in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$. The results are based on data sample $107.6{\mathrm{pb}}^{\ensuremath{-}1}$ recorded during 1992--1995 D0 detector Fermilab Tevatron collider. background, predominantly from jets which...
We present a measurement of the $t\overline{t}$ production cross section in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ by D0 experiment Fermilab Tevatron. The is based on data from an integrated luminosity approximately $125{\mathrm{pb}}^{\ensuremath{-}1}$ accumulated during 1992--1996 collider run. observe 39 candidate events dilepton and $\mathrm{lepton}+\mathrm{jets}$ decay channels with expected background...
The DØ detector is used to study pp̄ collisions at the 1800 and 630 GeV center-of-mass energies available Fermilab Tevatron. To measure jets, uses a sampling calorimeter composed of uranium liquid argon as passive active media, respectively. Understanding jet energy calibration not only crucial for precision tests QCD, but also measurement particle masses determination physics backgrounds associated with new phenomena. This paper describes jets observed two in transverse pseudorapidity range...
Bottom-quark production in $\overline{p}p$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ is studied with $5{\mathrm{pb}}^{\ensuremath{-}1}$ of data collected 1995 by the D0 detector Fermilab Tevatron Collider. The differential cross section for $b$ jets central rapidity region ( $|{y}^{b}|<1$) as a function jet transverse energy extracted from muon-tagged sample. Within experimental and theoretical uncertainties, results are found to be higher...
Results are presented from analyses of jet data produced in pbarp collisions at sqrt{s} = 630 and 1800 GeV collected with the DO detector during 1994-95 Fermilab Tevatron Collider run. We discuss details calibration, selection criteria measurements various production cross sections GeV. The inclusive sections, dijet mass spectrum, angular distributions, ratio compared to next-to-leading-order QCD predictions. order alpha_s^3 calculations good agreement data. also use rule out models quark...
We present a measurement of the W boson mass using data collected by D0 experiment at Fermilab Tevatron during 1994–1995. identify bosons their decays to eν final states. extract MW fitting transverse and electron momentum spectra from sample 28 323 −→Weν decay candidates. use 3563 dielectron events, mostly due →Zee decays, constrain our model detector response. From fit we measure MW=80.44±0.10(stat)±0.07(syst) GeV. Combining this with previously published result taken in 1992–1993, obtain...