M. Campbell
A5023748369- 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
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Radiation Effects in Electronics
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- CCD and CMOS Imaging Sensors
- Parallel Computing and Optimization Techniques
- Nuclear Physics and Applications
- Advanced Data Storage Technologies
- Stellar, planetary, and galactic studies
- Superconducting Materials and Applications
University of Michigan–Ann Arbor
2010-2021
European Organization for Nuclear Research
1999-2014
Ann Arbor Center for Independent Living
2004-2013
Fermi National Accelerator Laboratory
1986-2013
TRIUMF
2012
National and Kapodistrian University of Athens
2011-2012
Argonne National Laboratory
1999-2012
University of Glasgow
2004-2012
University of California, Los Angeles
2012
Simon Fraser University
2011
We establish the existence of top quark using a 67 pb^-1 data sample Pbar-P collisions at Sqrt(s) = 1.8 TeV collected with Collider Detector Fermilab (CDF). Employing techniques similar to those we previously published, observe signal consistent t-tbar decay WW b-bbar, but inconsistent background prediction by 4.8 sigma. Additional evidence for is provided peak in reconstructed mass distribution. measure be 176 +/-8(stat) +/- 10(sys.) GeV/c^2, and production cross section 6.8 +3.6 -2.4 pb.
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.
We present the results of a search for top quark in 19.3 pb−1 p¯p collisions at √s =1.8 TeV. The data were collected Fermilab Tevatron collider using Collider Detector (CDF). includes standard model tt¯ decays to final states eeνν¯, eμνν¯, and μμνν¯ as well e+ν+jets or μ+ν+jets. In (e,μ)+ν+jets channel we b quarks from t via secondary vertex identification semileptonic cascade c quarks. dilepton find two events with background 0.56+0.25−0.13 events. e,μ+ν+jets identified vertex, six 2.3±0.3....
We summarize a search for the top quark with Collider Detector at Fermilab (CDF) in sample of p¯p collisions √s =1.8 TeV an integrated luminosity 19.3 pb−1. find 12 events consistent either two W bosons, or boson and least one b jet. The probability that measured yield is background 0.26%. Though statistics are too limited to establish firmly existence quark, natural interpretation excess it due tt¯ production. Under this assumption, constrained fits individual mass 174±10+13−12 GeV/c2....
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.
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} achieved and no candidate events were observed. We set an upper limit 3.0×10^{-9} branching fraction at 90% confidence level (C.L.), which improved previous by almost order magnitude. An K_{L}→π^{0}X^{0} also as 2.4×10^{-9} C.L., where X^{0} is invisible boson with mass 135 MeV/c^{2}.
The production and event topology of three-jet events produced in p¯p collisions at √s=1.8 TeV have been studied with the Collider Detector Fermilab Tevatron Collider. distributions angular variables (ψ∗ cosθ∗) describing energy sharing between jets (x3 x4) are found to agree well tree-level QCD calculations. These predicted different shapes for initial-state subprocesses (quark-antiquark, quark-gluon, gluon-gluon). data consistent small expected contribution from quark-antiquark initial...
A strong signal for double parton (DP) scattering is observed in a $16{\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ sample of $\overline{p}p\ensuremath{\rightarrow}\ensuremath{\gamma}/{\ensuremath{\pi}}^{0}+3\mathrm{jets}+X$ data from the CDF experiment at Fermilab Tevatron. In DP events, two separate hard scatterings take place single $\overline{p}p$ collision. We isolate large $(\ensuremath{\sim}14000\mathrm{events})$ which 53% are found to be DP. The process-independent parameter scattering,...
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...
Inclusive J/\ensuremath{\psi} and \ensuremath{\psi}(2S) production has been studied in p\ifmmode\bar\else\textasciimacron\fi{}p collisions at \ensuremath{\surd}s =1.8 TeV using 2.6\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ of data taken with the Collider Detector Fermilab. The products cross section times branching fraction were measured as functions ${\mathit{P}}_{\mathit{T}}$ for...
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.
We report the observation of bottom-charmed mesons ${B}_{c}$ in 1.8 TeV $p\overline{p}$ collisions using CDF detector at Fermilab Tevatron. The were found through their semileptonic decays, ${B}_{c}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{l}^{\ifmmode\pm\else\textpm\fi{}}X.$ A fit to $J/\ensuremath{\psi}l$ mass distribution yielded ${20.4}_{\ensuremath{-}5.5}^{+6.2}$ events from mesons. test null hypothesis, i.e., an attempt data with background alone, was...
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 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 measurements of the pseudorapidity (η) distribution charged particles (dNchdη) produced within |η|≤3.5 in proton-antiproton collisions at √s 630 and 1800 GeV. measure dNchdη η=0 to be 3.18±0.06(stat)±0.10(syst) GeV, 3.95±0.03 (stat)±0.13(syst) Many systematic errors ratio two energies cancel, we 1.26±0.01±0.04 for GeV that |η|≤3. Comparing lower-energy data, observe an increase faster than ln(s) η=0.Received 2 October 1989DOI:https://doi.org/10.1103/PhysRevD.41.2330©1990 American...
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...
The inclusive jet differential cross section has been measured for transverse energies, ET, from 15 to 440 GeV, in the pseudorapidity region 0.1≤|η|≤0.7. results are based on 19.5pb−1 of data collected by CDF Collaboration at Fermilab Tevatron collider. compared with QCD predictions various sets parton distribution functions. jets ET>200GeV is significantly higher than current O(αs3) perturbative calculations. Various possible explanations high- ET excess discussed.Received 25 January...