A5055597663- 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
- Computational Physics and Python Applications
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- advanced mathematical theories
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Muon and positron interactions and applications
- Nuclear physics research studies
- Nuclear Physics and Applications
- Radiation Effects in Electronics
Fermi National Accelerator Laboratory
2004-2025
TRIUMF
2010-2022
University of Pennsylvania
2007-2017
The University of Adelaide
2013-2016
University of Lisbon
2015-2016
Universitatea Națională de Știință și Tehnologie Politehnica București
2016
York University
2011-2015
Universidade Federal do Rio de Janeiro
2015
McGill University
2005-2013
Simon Fraser University
2013
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 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 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 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 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%....
In CDF we have observed the reactions p + p[over] --> X p[over], with being a centrally produced J/psi, psi(2S), or chi_{c0}, and gammagamma-->micro;{+}micro;{-} in pp[over] collisions at sqrt[s] = 1.96 TeV. The event signature requires two oppositely charged central muons, either no other particles one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, gamma J/psi(psi(2S)) p, here first time hadron-hadron collisions. We also observe...
We reconstruct the decays B -> K(*) mu+ mu- and measure their angular distributions in ppbar collisions at sqrt{s}=1.96TeV using a data sample corresponding to an integrated luminosity of 6.8fb-1. The transverse polarization asymmetry AT(2) time-reversal-odd charge-and-parity Aim are measured for first time, together with K* longitudinal fraction FL muon forward-backward AFB, B0 K*0 B+ K*+ mu-. Our results among most accurate date consistent those from other experiments.
We report the first observation of baryonic flavor-changing neutral current decay Λ(b)(0)→Λμ(+)μ(-) with 24 signal events and a statistical significance 5.8 Gaussian standard deviations. This measurement uses pp collisions data sample corresponding to 6.8 fb(-1) at √s = 1.96 TeV collected by CDF II detector Tevatron collider. The total differential branching ratios for are measured. find B(Λ(b)(0)→Λμ(+)μ(-))=[1.73 ± 0.42(stat) (syst)] × 10(-6). also ratio B(s)(0)→ϕμ(+)μ(-), using 49 events....
We report a study of the invariant mass distribution jet pairs produced in association with W boson using data collected CDF detector which correspond to an integrated luminosity 4.3 fb(-1). The observed has excess 120-160 GeV/c(2) range is not described by current theoretical predictions within statistical and systematic uncertainties. In this Letter, we studies properties excess.
The observation of the $Y(4140)$ structure in $B^\pm\rightarrow J/\psi\,\phi K^\pm$ decays produced $\bar{p} p $ collisions at $\sqrt{s}=1.96~\TeV$ is reported with a statistical significance greater than 5 standard deviations. A fit to $J/\psi\,\phi$ mass spectrum performed assuming presence Breit-Wigner resonance. yields signal $19^{+6}_{-5}$ resonance events, and width $4143.4^{+2.9}_{-3.0}(\mathrm{stat})\pm0.6(\mathrm{syst})~\MeVcc$...
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in 2030s. ILC addresses key questions for our current understanding of particle physics. It based proven technology. Its experiments will challenge Standard Model physics and provide window to look beyond it. This document brings story up date, emphasizing its strong motivation, readiness construction, opportunity it presents US community.
We report on measurements of the inclusive jet production cross section as a function transverse momentum in pp¯ collisions at s=1.96 TeV, using kT algorithm and data sample corresponding to 1.0 fb−1 collected with Collider Detector Fermilab run II. The are carried out five different rapidity regions |yjet|<2.1 range 54<pTjet<700 GeV/c. Next-to-leading order perturbative QCD predictions good agreement measured sections.4 MoreReceived 29 January 2007Publisher error corrected 25 May...
This article presents a measurement of the top quark mass using CDF II detector at Fermilab. Colliding beams protons and anti-protons Fermilab's Tevatron (sqrt{s}=1.96 TeV) produce top/anti-top pairs, which decay to W^+W^-bbbar; events are selected where one W decays hadrons, either e or mu plus neutrino. The data sample corresponds an integrated luminosity approximately 318 pb^-1. A total 165 ttbar separated into four subsamples based on jet transverse energy thresholds number b jets...
We measure the dipion mass spectrum in X(3872)--> J/psipi(+) pi(-) decays using 360 pb(-1) of pp collisions at square root s= 1.96 TeV collected with CDF II detector. The is fit predictions for odd C-parity ((3)S(1), (1)P(1), and (3)D(J)) charmonia decaying to pi(-), as well even states which pions are from rho(0) decay. latter case also encompasses exotic interpretations, such a D(0)D(*0) molecule. Only (3)S(1) J/psirho hypotheses compatible our data. Since untenable on other grounds, decay...