Narrow Results

A measurement of the production cross-section at with the DØ detector at the Fermilab Tevatron, based on the application of a multivariate topological method is presented. The integrated luminosity corresponds to 143.9 pb^-1 in the μ+jets and 141.2 pb^-1 in the e+jets channel. The preliminary cross-section is measured to be .

Using almost twice the luminosity of Run I, we present preliminary results on di-boson final states production at the Tevatron. These results include cross section measurements of most di-boson final states including the first measurement of WW cross section.

We present preliminary results of searches for technirho (ρ_T) and techniomega (ω_T) particles, using the decay channels (ρ_T), ω_T → e⁺e^- and , where , . These searches are based respectively on 200 pb^-1 and 238 pb^-1 of data collected in Run II of the Fermilab Tevatron. We select events with b–quark jets by identifying secondary vertices in the jets. We interpret our findings in terms of limits on the production of particles predicted by extended technicolor models. For the Wπ_T analysis, in the absence of an excess over standard model background, we compute a 95% C.L. upper limit on the techniparticle production cross section for the mass combination m(ρ_T) = 200 GeV and m(π_T) = 105 GeV of 6.4 pb. In the e⁺e^- channel, for certain model parameters, we exclude the existence of degenerate ρ_T and ω_T states with masses below 367 GeV; the most restrictive constraints on dilepton technicolor decays to date.

We have searched for R-parity violating supersymmetry in final states with electrons and muons, assuming a single non-zero LLĒ or coupling, in particular λ₁₂₁, λ₁₂₂ or λ′₂₁₁. In the absence of an excess in the data, upper cross-section limits are set as a function of gaugino and slepton masses.

The searches are performed on data collected with the DØ detector in Run II, at a center of mass energy of 1.96 TeV and an integrated luminosity of up to 240 pb^-1. All limits are improving significantly compared to the DØ Run I results.

Measurement of the B_s oscillation frequency via B_s mixing analyses provides a powerful constraint on the CKM matrix elements. The study of B_d oscillations is an important step towards B_s mixing and preliminary measurements of Δm_d have been made with ~250 pb^-1 of data collected with the upgraded Run II DØ detector. Different flavor tagging algorithms have been developed and are being optimized for use on a large set of B_s mesons that have been reconstructed in different semileptonic decay modes.

Correlations in the azimuthal angle between the two largest transverse momentum jets have been measured using the DØ detector in collisions at . The analysis is based on an inclusive dijet event sample in the central rapidity region corresponding to an integrated luminosity of 150 pb^-1. Azimuthal correlations are stronger at larger transverse momenta. These are well-described in NLO pQCD, except at large azimuthal differences where soft effects are significant.

We present a review of heavy flavor physics results from the CDF and DØ Collaborations operating at the Fermilab Tevatron Collider. A summary of results from Run 1 is included, but we concentrate on legacy results of charm and b physics from Run 2, including results up to Summer 2014.

This article contains a summary of the recent results in diffractive physics at the Tevatron. Results from the CDF diffraction program include the single diffractive to non-diffractive ratio in dijet events, observation of exclusive e⁺e^- production via two-photon exchange, hints of exclusive γγ production via Double Pomeron Exchange (DPE), and the observation of exclusive dijet production via DPE. A summary of the current plans for the DØ diffractive physics program is also presented.

The latest results on W and Z cross sections from collisions recorded by the CDF and DØ experiments at the Fermilab Tevatron collider, operating at a centre of mass energy of 1.96 TeV, are presented. These results have been used to used to validate (N)NLO QCD calculations, measure quark couplings, test lepton universality and constrain parton distributions functions. The width of the W boson has been obtained both directly from W events having a large transverse mass and indirectly from the ratio of W and Z cross sections. The possibility of using W events to determine the luminosity at the Tevatron and the future prospects for these measurements is also discussed.

We present CDF and DØ searches for a Standard Model Higgs boson produced associatively with a W or Z boson at using up to 1 fb^-1 of analyzed Tevatron data collected from February 2002 to February 2006. For Higgs masses less than 135 GeV/c², as is favored by experimental and theoretical constraints, , and are the most sensitive decay channels to search for the Higgs boson. Both CDF and DØ have analyzed these three channels and found no evidence for Higgs production, and therefore set upper limits on the Higgs production cross-section. While the analyses are not yet sensitive to Standard Model Higgs production, improvements in analysis techniques are increasing sensitivity to the Higgs much faster than added luminosity alone.