A. W. Booth

Measurement of bottom quark production in 1.8 TeV

We present a measurement of the [ital b]-quark cross section in 1.8 TeV [ital p]-[ital [bar p]] collisions recorded with the Collider Detector at Fermilab using muonic [ital b]-quark decays. In the central rapidity region ([vert bar][ital y][sup [ital b]][vert bar][lt]1.0), the cross section is 295[plus minus]21[plus minus]75 nb (59[plus minus]14[plus minus]15 nb) for [ital p][sub [ital T]][sup [ital b]][gt]21 GeV/[ital c] (29 GeV/[ital c]). Comparisons are made to previous measurements and next-to-leading order QCD calculations.

p\bar{p}

We present a measurement of jet shapes in [ital [bar p]p] collisions at [radical][ital s] =1.8 TeV at the Fermilab Tevatron using the Collider Detector at Fermilab (CDF). Qualitative agreement is seen with the predictions of recent next-to-leading [[ital O]([alpha][sub [ital s]][sup 3])] calculations and with leading logarithm QCD based Monte Carlo simulations. The dependence of the jet shape on transverse energy is studied.

collisions using semileptonic decay muons

An analysis of {ital W}- and {ital Z}-boson production using data from the Collider Detector at Fermilab at {radical}{ital s} =1.8 TeV yields {sigma}({ital W}{r arrow}{ital ev})/{sigma}({ital Z}{r arrow}{ital ee})=10.2{plus minus}0.8(stat){plus minus}0.4(syst). The width of the {ital W} boson, {Gamma}({ital W}), and a limit on the top-quark mass independent of decay mode are extracted from this measurement.

Measurement of jet shapes in p-barp collisions at sqrt s =1.8 TeV.

We present the dijet invariant-mass distribution in the region between 60 and 500 GeV, measured in 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. Jets are restricted to the pseudorapidity interval {vert bar}{eta}{vert bar}{lt}0.7. Data are compared with QCD calculations; axigluons are excluded with 95% confidence in the region 120{lt}{ital M}{sub {ital A}}{lt}210 GeV for axigluon width {Gamma}{sub {ital A}}={ital N}{alpha}{sub s}{ital M}{sub {ital A}}/6, with {ital N}=5.

Measurement of the ratio sigma (W-->e nu )/ sigma (Z-->ee) in p-barp collisions at sqrt s =1.8 TeV.

The production rate of charged {ital D}{sup *} mesons in jets has been measured in 1.8-TeV {ital {bar p}p} collisions at the Fermilab Tevatron with the Collider Detector at Fermilab. In a sample of approximately 32 300 jets with a mean transverse energy of 47 GeV obtained from an exposure of 21.1 nb{sup {minus}1}, a signal corresponding to 25.0{plus minus}7.5(stat){plus minus}2.0(syst) {ital D}{sup *{plus minus}}{r arrow}K{sup {minus plus}}{pi}{sup {plus minus}}{pi}{sup {plus minus}} events is seen above background. This corresponds to a ratio {ital N}({ital D}{sup *+}+D{sup *{minus}})/N(jet) =0.10{plus minus}0.03{plus minus}0.03 for {ital D}{sup *} mesons with fractional momentum {ital z} greater than 0.1.

Two-jet invariant-mass distribution at sqrt s =1.8 TeV.

We report the full reconstruction of χ c mesons through the decay chain χ c → J/ψ γ, J/ψ→μ + m - , using data obtained at the Collider Detector at Fermilab in 2.6±0.2 pb -1 of pp collisions at √s=1.8 TeV. This exclusive χ c sample is used to measure the χ c -meson production cross section times branching fractions. We obtain σ×B=3.2±0.4(stat) -1.1 +1.2 (syst) nb for χ c mesons decaying to J/ψ with p T >6.0 GeV/c and pseudorapidity |η|<0.5

Measurement of D /emph> production in jets from p̅p collisions at √s =1.8 TeV

We present a measurement of the [ital b]-quark cross section in 1.8 TeV [ital p]-[ital [bar p]] collisions recorded with the Collider Detector at Fermilab using muonic [ital b]-quark decays. In the central rapidity region ([vert bar][ital y][sup [ital b]][vert bar][lt]1.0), the cross section is 295[plus minus]21[plus minus]75 nb (59[plus minus]14[plus minus]15 nb) for [ital p][sub [ital T]][sup [ital b]][gt]21 GeV/[ital c] (29 GeV/[ital c]). Comparisons are made to previous measurements and next-to-leading order QCD calculations.

Inclusive [chi][sub [ital c]] and [ital b]-quark production in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV

We present a measurement of jet shapes in [ital [bar p]p] collisions at [radical][ital s] =1.8 TeV at the Fermilab Tevatron using the Collider Detector at Fermilab (CDF). Qualitative agreement is seen with the predictions of recent next-to-leading [[ital O]([alpha][sub [ital s]][sup 3])] calculations and with leading logarithm QCD based Monte Carlo simulations. The dependence of the jet shape on transverse energy is studied.

Measurement of bottom quark production in 1. 8 TeV [ital p[bar p]] collisions using muons from [ital b]-quark decays

We present results of a search for a first-generation leptoquark S 1 in pp collisions at √s = 1. 8 TeV at the Fermilab Tevatron. Using 4.05 pb −1 of data collected during the 1988-1989 CDF run, we have searched for evidence of S 1 S 1 production assuming that each leptoquark decays to an electron + quark pair with a branching ratio β. Three events with two high energy electrons and two high energy jets were found, but are consistent with Z 0 decay. No events were found in the signal region. Assuming a short lived scalar leptoquark with Yukawa coupling strength λ ≥ 2 × 10 −7 , we exclude σβ 2 > 55(4.0) pb at 95% C.L. for M S = 45(125) GeV/c 2 . Using a Monte Carlo prediction for σ(pp → S 1 S 1 + X), we exclude M S < 113(80) GEV/C 2 for β = 100(50)%

Measurement of jet shapes in [ital [bar p]p] collisions at [radical][ital s] =1. 8 TeV

We search for the rare decay W ± →γπ ± in 4.2 pb -1 of pp collisions recorded with the Collider Detector at Fermilab. At the 95% confidence level, we find an upper limit on the partial decay width to be Γ(W ± →γπ ± )/Γ(W ± →e ± v)7.5×10 -3