4,037 research outputs found
Standard Model high mass Higgs search at CDF
No full textThe CDF collaboration has analyzed almost 6 f b−1 of data collected at the Tevatron Collider at sqrt(s) = 1.96 TeV to search for Standard Model Higgs boson through the decay into W+W−. Starting from events with two leptons, advanced analysis techniques are applied to better discriminate signal from background. The Higgs sensitivity is maximized combining together analysis that exploit different event topologies. No significant excess over the expected background is observed and data is used to set a limit in units of Standard Model expectations. The limit plays a fundamental role in the Higgs search excluding the existence of this particle with mass between 158 and 175 GeV/c2 when combined with D0, the other Tevatron experiment
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QCD physics at CDF
Full text linkThe CDF collaboration is engaged in a broad program of QCD measurements at the Fermilab Tevatron Collider. I will discuss inclusive jet production at center-of-mass energies of 1800 GeV and 630 GeV, properties of events with very high total transverse energy and dijet angular distributions
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Electroweak physics at CDF
Full text linkThe CDF collaboration is engaged in a broad program of electroweak measurements. The production of WW, WZ, ZZ, W{sub {gamma}}, Z{sub {gamma}} and the high mass Drell Yan charge asymmetry will be discussed, along with a status report on extracting a new W mass from the most recent 90 pb{sup {minus}1} data sample
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High E{sub T} jet cross sections at CDF
No full textThe inclusive jet cross section for {ital p}{ital {anti p}} collisions at {radical}s = 1.8 TeV as measured by the CDF collaboration will be presented. Preliminary CDF measurements of the {Sigma} E{sub T} cross section at {radical}s = 1.8 TeV and the central inclusive jet cross section at {radical}s = 0.630 TeV will also be shown
Diffraction at CDF
No full textThe diffractive program of the CDF collaboration at the Fermilab Tevatron pp Collider is reviewed with emphasis on measurements of thediffractive structure function and on exclusive production from Run II at p =1.96 TeV. Results on cross sections for exclusive dijet production are used to calibrate theoretical estimates for exclusive Higgs production at the Large Hadron Collider
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Rare B decays and time dependent mixing at CDF
Full text linkWe report recent results on rare B decays searches -- specifically, the decay modes B{sup 0} {yields} {mu}{sup +}{mu}{sup {minus}}, B{sup 0} {yields} {mu}{sup +}{mu}{sup {minus}}K{sup 0*}, and B{sup {plus_minus}} {yields} {mu}{sup +}{mu}{sup {minus}}K{sup {plus_minus}} -- from the CDF collaboration using data from the 1992--1993 run of the Tevatron collider. In addition, we present the first CDF measurement of time dependent B{sup 0} {minus} {bar B}{sup 0} mixing
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High {Sigma}E{sub {Tau}} multijets at CDF
No full textThe CDF collaboration has studied properties of 3-, 4- and 5-jet events with very high total transverse energy. An appropriate set of kinematic variables is described and two calculations based on QCD and with a phase space model. The QCD calculations are in reasonably good agreement with the data
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Lifetime of B hadrons from CDF
Full text linkA review of the lifetimes of {ital B} hadrons measured by the CDF collaboration at Fermilab is presented. The data corresponds to 110 pb{sup -1} of {ital p}{ital {anti p}} collisions at {radical}s = 1.8 TeV. The inclusive {ital B} hadron lifetime is measured using a high statistics sample of {ital B} {r_arrow} {ital J}/{Psi}{Chi} decays. Species specific lifetimes of the {ital B}{sup +}, {ital B}{sup 0}, {ital B}{sup 0}{sub s}, and {Lambda}{sup 0}{sub b} are determined using both fully reconstructed decays and partially reconstructed decays consisting of a lepton associated with a charm hadron
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QCD tests at CDF
Full text linkWe present results for the inclusive jet cross section and the dijet mass distribution. The inclusive cross section and dijet mass both exhibit significant deviations from the predictions of NLO QCD for jets with E{sub T}>200 GeV, or dijet masses > 400 GeV/c{sup 2}. We show that it is possible, within a global QCD analysis that includes the CDF inclusive jet data, to modify the gluon distribution at high x. The resulting increase in the jet cross-section predictions is 25-35%. Owing to the presence of k{sub T} smearing effects, the direct photon data does not provide as strong a constraint on the gluon distribution as previously thought. A comparison of the CDF and UA2 jet data, which have a common range in x, is plagued by theoretical and experimental uncertainties, and cannot at present confirm the CDF excess or the modified gluon distribution
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Direct photon results from CDF
No full textResults using isolated direct photons measured with the CDF detector during the 1992--1993 run of the Fermilab Tevatron are presented. Photon detection and background subtraction are described. Measurement of the inclusive photon cross section as well as photon-jet cross sections are discussed and compared to next-to-leading order QCD predictions
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