[en] A muon cooling channel poses particular challenges to beam profiling. Two methods of beam measurement are being pursued: one senses the heat deposited by the beam using a thin film bolometer, and the other detects electrical pulses from the ionization of a thin CVD diamond substrate. Here we report on the detector designs and the status of prototype testing

[en] We present measurements of charge collection efficiency in double-sided silicon microstrip sensors using the signal from a pulsed laser. We compare the efficiency as a function of voltage and position for various strip geometries. The sensors studied here were manufactured as prototypes for the SVXII detector, an upgrade of the CDF silicon vertex detector for run II of the Fermilab Tevatron. Large inefficiencies were observed in prototypes with certain n-side strip geometries. (orig.)

[en] We present the results of a search for anomalous production of diphoton events with large missing transverse energy using the Collider Detector at Fermilab. In 202 pb^-1 of pp collisions at √(s)=1.96 TeV we observe no candidate events, with an expected standard model background of 0.27±0.07(stat)±0.10(syst) events. The results exclude a lightest chargino of mass less than 167 GeV/c², and lightest neutralino of mass less than 93 GeV/c² at 95% C.L. in a gauge-mediated supersymmetry-breaking model with a light gravitino

[en] We present a measurement of the ratio of top-quark branching fractions R=B(t→Wb)/B(t→Wq), where q can be a b, s, or a d quark, using lepton-plus-jets and dilepton data sets with an integrated luminosity of ∼162 pb^-1 collected with the Collider Detector at Fermilab during Run II of the Tevatron. The measurement is derived from the relative numbers of tt events with different multiplicity of identified secondary vertices. We set a lower limit of R>0.61 at 95% confidence level

[en] We report a measurement of the tt production cross section using the CDF II detector at the Fermilab Tevatron. The data consist of events with an energetic electron or muon, missing transverse energy, and three or more hadronic jets, at least one of which is identified as a b-quark jet by reconstructing a secondary vertex. The background fraction is determined from a fit of the transverse energy of the leading jet. Using 162±10 pb^-1 of data, the total cross section is found to be 6.0±1.6(stat.)±1.2(syst.) pb, which is consistent with the standard model prediction

[en] We report on a study of jet shapes in inclusive jet production in pp collisions at √(s)=1.96 TeV using the upgraded collider detector at Fermilab in Run II (CDF II) and based on an integrated luminosity of 170 pb^-1. Measurements are carried out on jets with rapidity 0.1<|Y^jet|<0.7 and transverse momentum 37 GeV/c< P_T^jet<380 GeV/c. The jets have been corrected to the hadron level. The measured jet shapes are compared to leading-order QCD parton-shower Monte Carlo predictions as implemented in the PYTHIA and HERWIG programs. PYTHIA, tuned to describe the underlying event as measured in CDF Run I, provides a better description of the measured jet shapes than does PYTHIA or HERWIG with their default parameters

[en] The standard model predictions for Wγ and Zγ production are tested using an integrated luminosity of 200 pb^-1 of pp collision data collected at the Collider Detector at Fermilab. The cross sections are measured by selecting leptonic decays of the W and Z bosons, and photons with transverse energy E_T>7 GeV that are well separated from leptons. The production cross sections and kinematic distributions for the Wγ and Zγ data are compared to SM predictions

[en] We present a search for ZZ and ZW vector boson pair production in pp collisions at √(s)=1.96 TeV using the leptonic decay channels ZZ→llνν, ZZ→lll^'l^', and ZW→lll^'ν. In a data sample corresponding to an integrated luminosity of 194 pb^-1 collected with the Collider Detector at Fermilab, 3 candidate events are found with an expected background of 1.0±0.2 events. We set a 95% confidence level upper limit of 15.2 pb on the cross section for ZZ plus ZW production, compared to the standard model prediction of 5.0±0.4 pb

[en] We report on a search for the pair production of scalar leptoquarks (LQ), using 191 pb^-1 of proton-antiproton collision data recorded by the CDF experiment during Run II of the Tevatron. The leptoquarks are sought via their decay into a neutrino and quark yielding missing transverse energy and several jets of large transverse energy. No evidence for LQ production is observed, and limits are set on σ(pp→LQLQX→ννqqX). Using a next-to-leading order theoretical prediction of the cross section for LQ production, we exclude first-generation LQ in the mass interval 78 to 117 GeV/c² at the 95% confidence level for BR(LQ→νq)=100%

[en] We report a measurement of the forward-backward charge asymmetry of electrons from W boson decays in pp collisions at √(s)=1.96 TeV using a data sample of 170 pb^-1 collected by the Collider Detector at Fermilab. The asymmetry is measured as a function of electron rapidity and transverse energy and provides new input on the momentum fraction dependence of the u and d quark parton distribution functions within the proton