M.-T. Cheng
A5016653324- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Asphalt Pavement Performance Evaluation
- Radiation Dose and Imaging
- Infrastructure Maintenance and Monitoring
- Smart Materials for Construction
- Traditional Chinese Medicine Studies
- Nutrition and Health in Aging
- Diet and metabolism studies
- Scheduling and Optimization Algorithms
- Optimization and Packing Problems
- Advanced X-ray and CT Imaging
- Adipokines, Inflammation, and Metabolic Diseases
Qingdao University
2024-2025
University of Illinois System
2024
University of Illinois Urbana-Champaign
2023
Instituto de Física de Cantabria
2000-2004
Universidad de Cantabria
2000-2004
Children's Defense Fund
1995-2004
Academia Sinica
1995-2004
Institute of Physics, Academia Sinica
1999-2003
Fermi National Accelerator Laboratory
1998-2003
Istituto Nazionale di Fisica Nucleare
1995-2002
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 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 positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
We have observed bottom-charm mesons B_c via the decay mode Bc -> J/psi lepton neutrino in 1.8 TeV p-bar p collisions using CDF detector at Fermilab Tevatron. A fit of background and signal contributions to + mass distribution yielded 20.4 +6.2 -5.5 events from mesons. same with alone was rejected level 4.8 standard deviations. measured be 6.40 +- 0.39 0.13 GeVc^2 lifetime tau(B_c) = 0.46 +0.18 -0.16 0.03 ps. production cross section times branching ratio for relative that B+ K 0.132 +0.041...
We present a study of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ production in $p\overline{p}$ collisions, at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ with the CDF detector Fermilab. The mesons are reconstructed using their ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay modes. have measured inclusive cross section for both as function transverse momentum central region, $|\ensuremath{\eta}|<0.6$. also measure fraction these events...
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 have measured the fraction of $J/\ensuremath{\psi}$ mesons originating from ${\ensuremath{\chi}}_{c}$ meson decays in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$. The fraction, for ${P}_{T}^{J/\ensuremath{\psi}}>4.0\mathrm{GeV}/c$ and $|{\ensuremath{\eta}}^{J/\ensuremath{\psi}}|<0.6$, not including contributions $b$ flavored hadrons, is...
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...
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...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
We have searched for heavy neutral gauge bosons (Z′) in dielectron and dimuon decay modes using 110pb−1 of ¯pp collisions at √s=1.8TeV collected with the Collider Detector Fermilab. present a limit on production cross section times branching ratio Z′ boson decaying into dileptons as function mass. For mass MZ′>600GeV/c2, upper is 40 fb 95% confidence level. set lower limits 690, 590, 620, 595, 565, 630, 600GeV/c2 Z′SM, Zψ, Zη, Zχ, ZI, ZLR, ZALRM, respectively.Received 6 May...
We report on measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections (d(2)sigma/dp(T)dy)(/y/<0.4), as well Upsilon(1S) polarization in p macro collisions at square root s = 1.8 TeV using a sample 77+/-3 pb(-1) collected by collider detector Fermilab. The three resonances were reconstructed through decay Upsilon-->mu(+)mu(-). measured angular distribution muons rest frame is consistent with unpolarized meson production.
The transverse momentum and total cross section of e^+e^- pairs in the Z-boson region 66<M_{ee}<116 GeV$/c^2$ from $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV are measured using 110 pb^{-1} taken by Collider Detector Fermilab during 1992-1995. is to be $248 \pm 11$ pb. differential compared with calculations that match quantum chromodynamics perturbation theory high gluon resummation formalism low momentum.
We search for the flavor-changing neutral current decays of top quark t→qγ and t→qZ (here q represents c u quarks) in ¯pp collisions at √s=1.8TeV. use a dataset (∫Ldt∼110pb−1) collected during 1992–1995 run Collider Detector Fermilab. set 95% confidence level limits on branching fractions B(t→qγ)<3.2% B(t→qZ)<33%, consistent with standard model.Received 24 July 1997DOI:https://doi.org/10.1103/PhysRevLett.80.2525©1998 American Physical Society
We have used 106 pb^-1 of data collected with the Collider Detector at Fermilab to search for new particles decaying dijets. exclude 95% confidence level models containing following particles: axigluons and flavor universal colorons mass between 200 980 GeV/c, excited quarks 80 570 GeV/c^2 580 760 GeV/c^2, color octet technirhos 260 480 W' bosons 300 420 E_6 diquarks 290 GeV/c^2.
A strong signal for double parton scattering (DP) is observed in a $16\mathrm{pb}{}^{\ensuremath{-}1}$ sample of $\overline{p}p\ensuremath{\rightarrow}\ensuremath{\gamma}+3\mathrm{jets}+X$ data from the CDF experiment at Fermilab Tevatron. The process-independent DP parameter, ${\ensuremath{\sigma}}_{\mathrm{eff}}$, obtained without reference to theoretical calculations by comparing events with hard scatterings separate $\overline{p}p$ collisions. result,...
This paper presents the first direct measurement of $B$ meson differential cross section, $d\sigma/dp_T$, in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV using a sample $19.3 \pm 0.7$ pb$^{-1}$ accumulated by Collider Detector Fermilab (CDF). The section is measured central rapidity region $|y| < 1$ for $p_T(B) > 6.0$ GeV/$c$ fully reconstructing decays $B^{+}\to J/\psi K^{+}$ and $B^{0}\to K^{*0}(892)$, where $J/\psi \to \mu^+\mu^-$ $K^{*0} K^+ \pi^-$. A comparison made to theoretical QCD...
We report results from a study of events with leading antiproton beam momentum fraction 0.905<x(F)<0.965 and 4-momentum transfer squared |t|<3 GeV2 produced in &pmacr;p collisions at sqrt[s] = 1800 GeV the Fermilab Tevatron collider. Approximately 2% contain two jets transverse energy E(jet)(T)>7 GeV. Using dijet events, we evaluate diffractive structure function compare it expectations based on obtained deep inelastic scattering experiments DESY ep collider HERA.
This paper reports an updated measurement of the Standard Model CP violation parameter $\sin2\beta$ using CDF Detector at Fermilab. The entire Run I data sample 110 pb$^{-1}$ proton antiproton collisions $\sqrt{s}=1.8 TeV$ is used to identify a signal $\sim 400$ $B \to J/\psi K^0_S$ events, where $J/\psi \mu^+\mu^-$ and $K_S^0 \pi^+\pi^-$. flavor neutral B meson identified time production by combining information from three tagging algorithms: same-side tag, jet-charge soft-lepton tag. A...
We have reconstructed the radiative decays $\chi_{b}(1P) \to \Upsilon(1S) \gamma $ and $\chi_{b}(2P) in $p \bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV, measured fraction of $\Upsilon(1S)$ mesons that originate from these decays. For with $p^{\Upsilon}_{T}>8.0$ GeV/$c$, fractions come $\chi_{b}(1P)$ $\chi_{b}(2P)$ are $(27.1\pm6.9(stat)\pm4.4(sys))%$ $(10.5\pm4.4(stat)\pm1.4(sys))%$, respectively. derived directly produced to be $(50.9\pm8.2(stat)\pm9.0(sys))%$.
A prompt photon cross section measurement from the Collider Detector at Fermilab experiment is presented. and trigger upgrades, as well 6 times integrated luminosity compared with our previous publication, have contributed to a much more precise extended PT range. As before, QCD calculations agree qualitatively measured section, but data has steeper slope than calculations.Received 26 July 1994DOI:https://doi.org/10.1103/PhysRevLett.73.2662©1994 American Physical Society