We report on measurements of the inclusive jet production cross section as a function of the jet transverse momentum in p p collisions at s p 1:96 TeV, using the k T algorithm and a data sample corresponding to 1:0 fb ÿ1 collected with the Collider Detector at Fermilab in run II. The measurements are carried out in five different jet rapidity regions with jy jet j < 2:1 and transverse momentum in the range

We report a measurement of the top-quark mass, Mt, in the dilepton decay channel of tt→bℓ'+νℓ′b¯ℓ−ν¯ℓ using an integrated luminosity of 1.0  fb−1 of pp collisions collected with the CDF II detector. We apply a method that convolutes a leading-order matrix element with detector resolution functions to form event-by-event likelihoods; we have enhanced the leading-order description to describe the effects of initial-state radiation. The joint likelihood is the product of the likelihoods from 78 candidate events in this sample, which yields a measurement of Mt=164.5±3.9(stat.)±3.9(syst.)  GeV/c2, the most precise measurement of Mt in the dilepton channel

We report the observation of Bs(0)-Bs(0) oscillations from a time-dependent measurement of the Bs(0)-Bs(0) oscillation frequency Deltams. Using a data sample of 1 fb(-1) of pp collisions at square root of s=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic Bs decays, 3100 partially reconstructed hadronic Bs decays, and 61,500 partially reconstructed semileptonic Bs decays. We measure the probability as a function of proper decay time that the Bs decays with the same, or opposite, flavor as the flavor at production, and we find a signal for Bs(0)-Bs(0) oscillations. The probability that random fluctuations could produce a comparable signal is 8 x 10(-8), which exceeds 5sigma significance. We measure Deltams=17.77 +/- 0.10(stat) +/- 0.07(syst) ps(-1) and extract /V(td)/V(ts)/=0.2060+/-0.0007(Deltams)(-0.0060)(+0.008)(Deltamd+theor).

We measure the ratio of cross section times branching fraction, Rp=sigma chi c2 B(chi c2-->J/psi gamma)/sigma chi c1 B(chi c1-->J/psi gamma), in 1.1 fb(-1) of pp collisions at square root s=1.96 TeV. This measurement covers the kinematic range pT(J/psi)>4.0 GeV/c, |eta(J/psi)<1.0, and pT(gamma)>1.0 GeV/c. For events due to prompt processes, we find Rp=0.395+/-0.016(stat)+/-0.015(syst). This result represents a significant improvement in precision over previous measurements of prompt chi c1,2 hadro production.

We describe a measurement of the top quark mass using events with two charged leptons collected by the CDF II detector from pp collisions with √ s = 1.96 TeV at the Fermilab Tevatron. The likelihood in top mass is calculated for each event by convoluting the leading order matrix element describing qq → tt → b ν b ν with detector resolution functions. The presence of background events in the data sample is modeled using similar calculations involving the matrix elements for major background processes. In a data sample with integrated luminosity of 340 pb −1 , we observe 33 candidate events and measure Mtop = 165.2 ± 6.1(stat.) ± 3.4(syst.) GeV/c 2 . This measurement represents the first application of this method to events with two charged leptons and is the most precise single measurement of the top quark mass in this channel.