An inclusive search for the standard model Higgs boson using the four-lepton final state in proton-antiproton collisions produced by the Tevatron at radicals = 1.96 TeV is conducted. The data are ...recorded by the CDF II detector and correspond to an integrated luminosity of 9.7 fb super(-1). Three distinct Higgs decay modes, namely ZZ, WW, and tautau, are simultaneously probed. Nine potential signal events are selected and found to be consistent with the background expectation. We set a 95% credibility limit on the production cross section times the branching ratio and subsequent decay to the four-lepton final state for hypothetical Higgs boson masses between 120 GeV /c super(2) and 300 GeV /c super(2).
A
bstract
We report on a search for the supersymmetric partner of the top quark (scalar top) decaying into a charm quark and a neutralino in
$ p\bar{p} $
collisions at
$ \sqrt{s}=1.96\;\mathrm{TeV} $
.... The data sample, collected by the CDF II detector at the Fermilab Tevatron, corresponds to an integrated luminosity of 2
.
6 fb
−1
. Candidate events are selected by requiring two or more jets and a large imbalance in the transverse momentum. To enhance the analysis sensitivity, at least one of the jets is required to be identified as originating from a charm quark using an algorithm specifically designed for this analysis. The selected events are in good agreement with standard model predictions. In the case of large mass splitting between the scalar top quark and the neutralino we exclude a scalar top quark mass below 180 GeV
/c
2
at 95% confidence level.
We use a new method to estimate with 5% accuracy the contribution of pion and kaon in-flight-decays to the dimuon data set acquired with the CDF detector. Based on this improved estimate, we show ...that the total number and the properties of the collected dimuon events are not yet accounted for by ordinary sources of dimuons which also include the contributions, as measured in the data, of heavy flavor, Upsilon , and Drell-Yan production in addition to muons mimicked by hadronic punchthrough. The number of unaccounted events corresponds to (12.8 plus or minus 3.2)% of the $b\bar{b}$ production. We find that (23 plus or minus 6)% of the unaccounted events contain additional muon candidates. For comparison, this fraction is (6.9 plus or minus 0.4)% for events due to $b\bar{b}$ production.
We report on a search for narrow-width particles decaying to a top and antitop quark pair. The data set used in the analysis corresponds to an integrated luminosity of 680 pb{sup -1} collected with ...the Collider Detector at Fermilab in run II. We present 95% confidence level upper limits on the cross section times branching ratio. Assuming a specific top-color-assisted technicolor production model, the leptophobic Z{sup '} with width {gamma}{sub Z{sup '}}=0.012M{sub Z{sup '}}, we exclude the mass range M{sub Z{sup '}}<725 GeV/c{sup 2} at the 95% confidence level.
We measure the mean lifetime {tau}=2/({gamma}{sub L}+{gamma}{sub H}) and the decay-width difference {delta}{gamma}={gamma}{sub L}-{gamma}{sub H} of the light and heavy mass eigenstates of the B{sub ...s}{sup 0} meson, B{sub sL}{sup 0} and B{sub sH}{sup 0}, in B{sub s}{sup 0}{yields}J/{psi}{phi} decays using 1.7 fb{sup -1} of data collected with the CDF II detector at the Fermilab Tevatron pp collider. Assuming CP conservation, a good approximation for the B{sub s}{sup 0} system in the standard model, we obtain {delta}{gamma}=0.076{sub -0.063}{sup +0.059}(stat){+-}0.006(syst) ps{sup -1} and {tau}=1.52{+-}0.04(stat){+-}0.02(syst) ps, the most precise measurements to date. Our constraints on the weak phase and {delta}{gamma} are consistent with CP conservation.
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