Measurements of Higher Order Effects in QCD from the Tevatron Collider

Quantum Chromodynamics has been studied extensively at Fermilab's Tevatron collider. Between 1992 and 1996 the D{\O}and CDF experiments, each accumulated approximately $100 \mathrm{pb}^{-1}$ of proton-antiproton collisions at a center-of-mass energy $\sqrt{s}=1800 \mathrm{GeV}$ and $\sim 0.5 \mathrm{pb}^{-1}$ at $\sqrt{s}=630 \mathrm{GeV}$. In this paper, we present selected recent measurements of higher order effects in QCD: multiple jet production and subjet and charged particle multiplicities in quark and gluon jets.Comment: 4 pages, 3 figures in epsi file, talk given at XXXI International Symposium on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. URL http://ismd31.ccnu.edu.cn

A Search for Charged Massive Stable Particles

A search for charged massive (quasi-) stable particles with the D0 detector at the Tevatron collider based on 390 pb^{-1} of data is presented. The search is performed in the frameworks of gauge-mediated supersymmetry breaking and the minimal supersymmetric extentension of the standard model. The hypothetical particles are assumed to be pair-produced in p-anti-p collisions giving a signature of two reconstructed muon-like objects with high invariant mass and time-of-flights indicative of heavy particles. Since no excess over background is observed, cross-section limits for the pair-production of stable staus and charginos are set. Mass limits of 140 GeV for a higgsino-like chargino and 174 GeV for a gaugino-like chargino are set.Comment: For the D0 Collaboration. Presented at HEP2005 International Europhysics Conference on High Energy Physics, July 21st - 27th 2005, Lisboa, Portugal (4 pages, 4 figures

Searches for Scalar Top and Bottom Quarks at the Tevatron

Searches for the supersymmetric partners of top and bottom quarks using data up to 340 pb$^{-1}$ taken at the Tevatron $p\bar{p}$ collider are described. We report on searches for scalar top quarks $\tilde{t}$ in the decays $\tilde{t}\to c \tilde{\chi}_1^0$ and $\tilde{t}\to bl\tilde{\nu}$ and for scalar bottom quarks $\tilde{b}$ in the decay $\tilde{b}\to b \tilde{\chi}_1^0$. No evidence for a signal has been found, but improved exclusion regions have been derived in the framework of a generic minimal superymmetric extension of the standard model.Comment: For the D0 and CDF Collaborations. Presented at HEP2005 International Europhysics Conference on High Energy Physics, July 21st - 27th 2005, Lisboa, Portugal (4 pages, 4 figures

Search for SUSY in Gauge Mediated and Anomaly Mediated Supersymmetry Breaking Models

In this note, recent results on the search for Gauge Mediated Supersymmetry Breaking (GMSB) and Anomaly Mediated Supersymmetry Breaking (AMSB) at the LEP and Tevatron colliders are summarized. We report on DZERO's search for GMSB in di-photon events with large missing transverse energy and discuss the sensitivity of similar searches based on future Tevatron integrated luminosities.Comment: 3 pages, 4 pages, talk presented at the International Europhysics Conference on High Energy Physics EPS, July 17th-23rd 2003, Aachen, German

Searches for leptoquark production and compositeness at the Tevatron

Recent searches for leptoquark production and compositeness in p-anti-p collisions at sqrt{s}=1.96 TeV are presented using data samples with integrated luminosities up to 4 fb^{-1} recorded with the D0 and CDF detectors at the Tevatron collider.Comment: Invited talk at European Physical Society Europhysics Conference on High Energy Physics, EPS-HEP 2009, Krakow, Polan

Electroweak physics at the Tevatron

Recent measurements of processes involving the electroweak bosons, Z and W, performed at the Fermilab Tevatron Collider are summarized. The large integrated luminosities collected by both the D0 and CDF Collaborations enable precise measurements of differential single boson production cross sections, the determination of the W mass with unprecedented precision, and the observation of diboson production including ZZ.Comment: 6+1 pages, plenary talk at Physics at LHC 2008, Split, Croatia (for the D0 and CDF Collaborations

PoS(EPS-HEP 2009)268 Searches for leptoquark production and compositeness at the Tevatron

Recent searches for leptoquark production and compositeness in pp collisions at √ s = 1.96 TeV are presented using data samples with integrated luminosities up to 4 fb −1 recorded with the D0 and CDF detectors at the Tevatron collider