We present a search for a Higgs boson decaying to two W bosons in pp collisions at √ s = 1.96TeV center-of-mass energy. The data sample corresponds to an integrated luminosity of 3.0 fb −1 collected with the CDF II detector. We find no evidence for production of a Higgs boson with mass between 110 and 200 GeV/c 2 , and determine upper limits on the production cross section. For the mass of 160 GeV/c 2 , where the analysis is most sensitive, the observed (expected) limit is 0.7 pb (0.9 pb) at 95% Bayesian credibility level which is 1.7 (2.2) times the standard model cross section.

Motivated by recent data on B → ppK decay, we study various charmless three-body baryonic B decay modes, including Λpπ, Σ 0p π, ppπ, ppK 0 , in a factorization approach. These modes have rates of order 10 −6 . There are two mechanisms for the production of baryon pairs: current-produced and transition. The behavior of decay spectra from these baryon production mechanisms can be understood by using QCD counting rules. Predictions on rates and decay spectra can be checked in the near future.

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We present a search for new particles which produce narrow two-jet (dijet) resonances using protonantiproton collision data corresponding to an integrated luminosity of 1:13 fb À1 collected with the CDF II detector. The measured dijet mass spectrum is found to be consistent with next-to-leading-order perturbative QCD predictions, and no significant evidence of new particles is found. We set upper limits at the 95% confidence level on cross sections times the branching fraction for the production of new particles decaying into dijets with both jets having a rapidity magnitude jyj < 1. These limits are used to determine the mass exclusions for the excited quark, axigluon, flavor-universal coloron, E 6 diquark, coloroctet techni-, W 0 , and Z 0 .

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