B. Blumenfeld
A5002177924- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Scientific Computing and Data Management
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- International Science and Diplomacy
- Radiation Therapy and Dosimetry
Johns Hopkins University
2016-2025
Institute of High Energy Physics
2015-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
University of Kansas
2014-2023
Rice University
2022
University of Virginia
2021
Texas Tech University
2021
University of Wisconsin–Madison
2020
European Organization for Nuclear Research
2012-2017
We present a new measurement of the inclusive and differential production cross sections $J/\ensuremath{\psi}$ mesons $b$ hadrons in proton-antiproton collisions at $\sqrt{s}=1960\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. The data correspond to an integrated luminosity $39.7\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ collected by CDF run II detector. find section for all transverse momenta from 0 $20\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ rapidity range $|y|<0.6$ be...
We report the observation of a narrow state decaying into $J/\psi\pi^+\pi^-$ and produced in $220 pb^{-1}$ $\bar{p} p $ collisions at $\sqrt{s}=1.96 TeV$ CDF II experiment. observe 730 \pm 90 decays. The mass is measured to be $3871.3 0.7 (stat) 0.4 (syst) MeV/c2$, with an observed width consistent detector resolution. This agreement recent by Belle Collaboration X(3872) meson.
The mass of the W boson, a mediator weak force between elementary particles, is tightly constrained by symmetries standard model particle physics. Higgs boson was last missing component model. After observation measurement provides stringent test We measure mass, MW, using data corresponding to 8.8 inverse femtobarns integrated luminosity collected in proton-antiproton collisions at 1.96 tera-electron volt center-of-mass energy with CDF II detector Fermilab Tevatron collider. A sample...
We present a new measurement of the inclusive forward-backward $t\overline{t}$ production asymmetry and its rapidity mass dependence. The measurements are performed with data corresponding to an integrated luminosity $5.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$, recorded CDF-II Detector Fermilab Tevatron. Significant asymmetries observed in both laboratory frame rest frame, cases found be consistent $CP$ conservation...
We report the observation of ${B}_{s}^{0}\mathrm{\text{\ensuremath{-}}}{\overline{B}}_{s}^{0}$ oscillations from a time-dependent measurement oscillation frequency $\ensuremath{\Delta}{m}_{s}$. Using data sample $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$ collected with CDF II detector Fermilab Tevatron, we find signals 5600 fully reconstructed hadronic ${B}_{s}$ decays, 3100 partially and 61 500 semileptonic decays....
We report the first observation of single top quark production using 3.2 fb^-1 pbar p collision data with sqrt{s}=1.96 TeV collected by Collider Detector at Fermilab. The significance observed is 5.0 standard deviations, and expected sensitivity for model decay in excess 5.9 deviations. Assuming m_t=175 GeV/c^2, we measure a cross section 2.3 +0.6 -0.5 (stat+syst) pb, extract CKM matrix element value |V_{tb}|=0.91 +-0.11 0.07(theory), set limit |V_{tb}|>0.71 95% C.L.
Evidence is reported for a narrow structure near the J/psivarphi threshold in exclusive B;{+} --> J/psivarphiK;{+} decays produced p[over]p collisions at sqrt[s] = 1.96 TeV. A signal of 14 +/- 5 events, with statistical significance excess 3.8 standard deviations, observed data sample corresponding to an integrated luminosity 2.7 fb;{-1}, collected by CDF II detector. The mass and natural width are measured be 4143.0 2.9(stat) 1.2(syst) MeV/c;{2} 11.7_{-5.0};{+8.3}(stat) 3.7(syst) MeV/c;{2}.
We combine searches by the CDF and D0 Collaborations for associated production of a Higgs boson with $W$ or $Z$ subsequent decay to bottom-antibottom quark pair. The data, originating from Fermilab Tevatron $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, correspond integrated luminosities up $9.7\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. are conducted mass in range $100--150\text{ }\mathrm{GeV}/{c}^{2}$. observe an excess events data compared background predictions,...
We present a search for new particles which produce narrow two-jet (dijet) resonances using proton-antiproton collision data corresponding to an integrated luminosity of $1.13\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the CDF II detector. The measured dijet mass spectrum is found be consistent next-to-leading-order perturbative QCD predictions, and no significant evidence found. set upper limits at 95% confidence level on cross sections times branching fraction...
We present a measurement of the $t\overline{t}$ production cross section using events with one charged lepton and jets from $p\overline{p}$ collisions at center-of-mass energy 1.96 TeV. In these events, heavy flavor quarks top quark decay are identified secondary vertex tagging algorithm. From $162\text{ }\text{ }\mathrm{p}{\mathrm{b}}^{\ensuremath{-}1}$ data collected by Collider Detector Fermilab, total 48 candidate selected, where $13.5\ifmmode\pm\else\textpm\fi{}1.8$ expected background...
We have studied the muon neutrino and antineutrino quasi-elastic (QEL) scattering reactions (ν μ n→μ − p $\bar{\nu }_{\mu}p\to\mu^{+}n$ ) using a set of experimental data collected by NOMAD Collaboration. performed measurements cross-section these processes on nuclear target (mainly carbon) normalizing it to total ν ( $\bar{\nu}_{\mu}$ charged-current cross section. The results for flux-averaged QEL sections in (anti)neutrino energy interval 3–100 GeV are $\langle...
We present an analysis of angular distributions and correlations the X(3872) particle in exclusive decay mode X(3872)->J/psi pi+ pi- with J/psi->mu+ mu-. use 780 pb -1 data from ppbar collisions at sqrt{s} = 1.96 TeV collected CDF II detector Fermilab Tevatron. derive constraints on spin, parity, charge conjugation parity by comparing measured products predictions for different JPC hypotheses. The assignments 1++ 2-+ are only ones consistent data.
This Letter describes the first determination of bounds on $CP$-violation parameter $2{\ensuremath{\beta}}_{s}$ using ${B}_{s}^{0}$ decays in which flavor bottom meson at production is identified. The result based approximately 2000 ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ reconstructed a $1.35\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with CDF II detector $p\overline{p}$ collisions produced Fermilab Tevatron. We report confidence...
We report the first measurements of inclusive W and Z boson cross sections times corresponding leptonic branching ratios for p pbar collisions at sqrt{s} = 1.96 TeV based on decays bosons into electrons muons. The data were recorded with CDF II detector Fermilab Tevatron correspond to an integrated luminosity 72.0 +/- 4.3 pb-1. test e-mu lepton universality in by measuring ratio W->mu nu W->e determine a value 0.991 0.004(stat.) 0.011(syst.) W-l-nu couplings (g_mu/g_e). Since there is no...
We present measurements of the forward-backward charge asymmetry in top pair production using 1.9 fb;{-1} pp[over ] collisions at sqrt[s]=1.96 TeV recorded with Collider Detector Fermilab II. Correcting for acceptance and measurement dilutions we obtain parton-level asymmetries A_{FB};{pp[over ]}=0.17+/-0.08 frame A_{FB};{tt[over ]}=0.24+/-0.14 tt[over frame. The values are consistent standard model expectation disfavor exotic mechanisms significant negative values.
We report on measurements of differential cross sections dsigma/dp(T) for prompt charm meson production in ppmacr; collisions at sqrt[s]=1.96 TeV using 5.8+/-0.3 pb(-1) data from the CDF II detector Fermilab Tevatron. The are collected with a new trigger that is sensitive to long lifetime hadrons containing heavy flavor. measured central rapidity region |y|</=1 four fully reconstructed decay modes: D0-->K-pi(+), D(*+)-->D0pi(+), D+-->K-pi(+)pi(+), D(+)(s)-->phipi(+), and their charge...
We have measured the polarizations of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ mesons as functions their transverse momentum ${p}_{T}$ when they are produced promptly in rapidity range $|y|<0.6$ with ${p}_{T}\ensuremath{\ge}5\text{ }\text{ }\mathrm{GeV}/c$. The analysis is performed using a data sample an integrated luminosity about $800\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected by CDF II detector. For both vector mesons, we find that become increasingly longitudinal...
We present the results of a search for νμ→νe oscillations in NOMAD experiment at CERN. The looked appearance νe predominantly νμ wide-band neutrino beam CERN SPS. No evidence was found. 90% confidence limits obtained are Δm2<0.4 eV2 maximal mixing and sin2(2θ)<1.4×10−3 large Δm2. This result excludes LSND allowed region oscillation parameters with Δm2≳10 eV2.
We have measured the polarization of J/psi and psi(2S) mesons produced in pp collisions at sqrt[s] = 1.8 TeV, using data collected Collider Detector Fermilab during 1992-1995. The promptly [psi(2S)] is isolated from those B-hadron decay, over kinematic range 4 [5.5]<P(T)<20 GeV/c |y|<0.6. For P(T) greater than or approximately equal 12 we do not observe significant prompt component.
The growth and development of ``charged particle jets'' produced in proton-antiproton collisions at $1.8 \mathrm{TeV} $ are studied over a transverse momentum range from $0.5$ $\mathrm{GeV}/c$ to $50$ $\mathrm{GeV}/c.$ A variety leading (highest momentum) charged jet observables compared with the QCD Monte Carlo models HERWIG, ISAJET, PYTHIA. describe fairly well multiplicity distribution particles within jet, size radial around direction, jet. direction jet'' each event is used define three...
We present new measurements of the inclusive forward-backward ttbar production asymmetry, AFB, and its dependence on several properties system. The are performed with full Tevatron data set recorded CDF II detector during ppbar collisions at sqrt(s) = 1.96 TeV, corresponding to an integrated luminosity 9.4 fb^(-1). measure asymmetry using rapidity difference Delta-y=y_(t)-y_(tbar). Parton-level results derived, yielding 0.164+/-0.047 (stat + syst). observe a linear AFB top-quark pair mass...
We present the results of a search for neutrino oscillations at Brookhaven National Laboratory. The experiment searched appearance ${\ensuremath{\nu}}_{\mathit{e}}$ (\ensuremath{\nu}${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}_{\mathit{e}}$), 1 km from source wide-band ${\ensuremath{\nu}}_{\mathrm{\ensuremath{\mu}}}$ (\ensuremath{\nu}${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}_{\mathrm{\ensuremath{\mu}}}$) beam. used total 3\ifmmode\times\else\texttimes\fi{}${10}^{19}$ protons...
We present a measurement of the inclusive jet cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ based on data collected by CDF II detector with an integrated luminosity $1.13\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The was made using cone-based midpoint clustering algorithm rapidity region $|y|<2.1$. results are consistent next-to-leading-order perturbative QCD predictions recent parton distribution functions (PDFs), and expected to provide increased...
We present the first measurement of Bs-Bsbar oscillation frequency Delta m_s. use 1 fb^-1 data from p-pbar collisions at sqrt{s}=1.96 TeV collected with CDF II detector Fermilab Tevatron. The sample contains signals 3,600 fully reconstructed hadronic Bs decays and 37,000 partially semileptonic decays. measure probability as a function proper decay time that same, or opposite, flavor production, we find signal consistent oscillations. random fluctuations could produce comparable is 0.2%....