T. Asakawa

Measurement of Dijet Angular Distributions by the Collider Detector at Fermilab.

We have used 106 pb^-1 of data collected in proton-antiproton collisions at sqrt(s)=1.8 TeV by the Collider Detector at Fermilab to measure jet angular distributions in events with two jets in the final state. The angular distributions agree with next to leading order (NLO) predictions of Quantum Chromodynamics (QCD) in all dijet invariant mass regions. The data exclude at 95% confidence level (CL) a model of quark substructure in which only up and down quarks are composite and the contact interaction scale is Lambda_ud(+)<1.6 TeV or Lambda_ud(-)<1.4 TeV. For a model in which all quarks are composite the excluded regions are Lambda(+)<1.8 TeV and Lambda(-)<1. 6 TeV.

The CDF Plug Upgrade Electromagnetic Calorimeter: Test Beam Results

Abstract The CDF Plug Upgrade calorimeter, which fully exploits the tile–fiber technique, was tested at the Fermilab meson beamline. The calorimeter was exposed to positron, positively charged pion and positive muon beams with energies in the range of 5– 230 GeV . The energy resolution of the electromagnetic calorimeter to the positron beam is consistent with the design value of 16%/ E ⊕1% , where E is the energy in units of GeV and ⊕ represents sum in quadrature. The non-linearity for positrons is studied in an energy range of 11– 181 GeV . It is important to incorporate the response of the preshower detector, the first layer of the electromagnetic calorimeter which is readout separately, into that of the calorimeter to reduce the non-linearity to 1% or less. The energy scale is about 1.46 pC / GeV with HAMAMATSU R4125 operated typically at a gain of 2.5×10 4 . The response non-uniformity over the surface of a tower of the electromagnetic calorimeter is found to be about 2% with 57 GeV positrons. Studies of several detailed detector characteristics are also presented.

Measurement of the B+ total cross section and B+ differential cross section d sigma/dp(T) in p(p)over-bar collisions at root s=1.8 TeV

We present measurements of the B+ meson total cross section and differential cross section

A scintillating tile/fiber system for the CDF plug upgrade EM calorimeter

d\sigma/ dp_T

A Scintillating tile / fiber system for a high-energy calorimeter with high light yield and uniform longitudinal and transverse response

. The measurements use a

Measurement of the ratio of b quark production cross sections in p̄p collisions at √s = 630 GeV and √s = 1800 GeV

98\pm 4

Measurement of the average time-integrated mixing probability of b-flavored hadrons produced at the Fermilab Tevatron

pb^{-1} sample of

Performance of a compensating lead/plastic scintillator tile/fiber calorimeter

p \bar p

Analysis of multijet events produced at high energy hadron colliders

collisions at

Intercalibration of the longitudinal segments of a calorimeter system

\sqrt{s}=1.8