Using 5.4 fb{sup -1} of integrated luminosity from pp collisions at {radical}(s)=1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider, we search for decays of the lightest ...Kaluza-Klein mode of the graviton in the Randall-Sundrum model to ee and {gamma}{gamma}. We set 95% C.L. lower limits on the mass of the lightest graviton between 560 and 1050 GeV for values of the coupling k/M{sub Pl} between 0.01 and 0.1.
We report results from a search for production of a neutral Higgs boson in association with a b quark. We search for Higgs decays to {tau} pairs with one {tau} subsequently decaying to a muon and the ...other to hadrons. The data correspond to 2.7 fb{sup -1} of pp collisions recorded by the D0 detector at {radical}(s)=1.96 TeV. The data are found to be consistent with background predictions. The result allows us to exclude a significant region of parameter space of the minimal supersymmetric model.
A search is performed for the standard model Higgs boson in 5.2 fb{sup -1} of pp collisions at sq root(s)=1.96 TeV, collected with the D0 detector at the Fermilab Tevatron Collider. The final state ...considered is a pair of b jets and large missing transverse energy, as expected from pp->ZH->nunubb production. The search is also sensitive to the WH->lnubb channel when the charged lepton is not identified. For a Higgs boson mass of 115 GeV, a limit is set at the 95% C.L. on the cross section multiplied by branching fraction for pp->(Z/W)H(H->bb) that is a factor of 3.7 larger than the standard model value, consistent with the factor of 4.6 expected.
A search for the standard model Higgs boson is presented using events with two charged leptons and large missing transverse energy selected from 5.4 fb{sup -1} of integrated luminosity in pp ...collisions at sq root(s)=1.96 TeV collected with the D0 detector at the Fermilab Tevatron collider. No significant excess of events above background predictions is found, and observed (expected) upper limits at 95% confidence level on the rate of Higgs boson production are derived that are a factor of 1.55 (1.36) above the predicted standard model cross section at m{sub H}=165 GeV.
We present a measurement of the effective weak mixing angle parameter sin2θeffℓ in pp¯→Z/γ*→μ+μ- events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron ...Collider and corresponding to 8.6 fb-1 of integrated luminosity. The measured value of sin2θeffℓμμ=0.23016±0.00064 is further combined with the result from the D0 measurement in pp¯→Z/γ*→e+e- events, resulting in sin2θeffℓcomb=0.23095±0.00040. This combined result is the most precise measurement from a single experiment at a hadron collider and is the most precise determination using the coupling of the Z/γ* to light quarks.
We present the first measurement of dijet angular distributions in pp collisions at sq root(s)=1.96 TeV at the Fermilab Tevatron Collider. The measurement is based on a dataset corresponding to an ...integrated luminosity of 0.7 fb{sup -1} collected with the D0 detector. Dijet angular distributions have been measured over a range of dijet masses, from 0.25 TeV to above 1.1 TeV. The data are in good agreement with the predictions of perturbative QCD and are used to constrain new physics models including quark compositeness, large extra dimensions, and TeV{sup -1} scale extra dimensions. For all models considered, we set the most stringent direct limits to date.
We provide the most precise measurement of the WW production cross section in pp collisions to date at a center of mass energy of 1.96 TeV, and set limits on the associated trilinear gauge couplings. ...The WW->lnul{sup '}nu (l, l{sup '}=e, mu) decay channels are analyzed in 1 fb{sup -1} of data collected by the D0 detector at the Fermilab Tevatron Collider. The measured cross section is sigma(pp->WW)=11.5+-2.1(stat+syst)+-0.7(lumi) pb. One- and two-dimensional 95% C.L. limits on trilinear gauge couplings are provided.
The eight-channel fast comparator IC Alexeev, G.D; Baturitsky, M.A; Dvornikov, O.V ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/1999, Letnik:
423, Številka:
1
Journal Article
Recenzirano
The eight-channel fast comparator IC has been designed for high-energy physics experiments. The propagation delay is 15–36 ns and will be decreased to 7–11 ns. The output front/trailing edges are 2.2
...ns and 1.8
ns at matched 110
Ω load. Dissipated power equals 84
mW/channel. The circuit current output can drive 30
m flat ribbon cable or twisted pair line terminated by differential line driver DS90C031.
We report on a first search for resonant pair production of neutral long-lived particles (NLLP) which each decay to a bb pair, using 3.6 fb{sup -1} of data recorded with the D0 detector at the ...Fermilab Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
We report on a first search for production of the lightest neutral CP-even Higgs boson (h) in the next-to-minimal supersymmetric standard model, where h decays to a pair of neutral pseudoscalar Higgs ...bosons (a), using 4.2 fb{sup -1} of data recorded with the D0 detector at Fermilab. The a bosons are required to either both decay to {mu}{sup +}{mu}{sup -} or one to {mu}{sup +}{mu}{sup -} and the other to {tau}{sup +}{tau}{sup -}. No significant signal is observed, and we set limits on its production as functions of M{sub a} and M{sub h}.
PDF
