Showing papers by "Kostantinos Kordas published in 1994"
TL;DR: In this article, the authors reported the measurement of the [ital B] meson and [ital b] quark cross sections through the decay chain using 4.3 pb[sup [minus]1] of data collected at the Collider Detector at Fermilab in [ital [bar p]p] collisions at [ital qrts]=1.8 TeV.
Abstract: This paper reports the measurement of the [ital B] meson and [ital b] quark cross sections through the decay chain [ital B][sup 0][r arrow][ital J]/[psi] K[sup *](892)[sup 0], [ital J]/[psi][r arrow][mu][sup +][mu][sup [minus]], [ital K][sup *](892)[sup 0][r arrow][ital K][sup +][pi][sup [minus]], using 4.3 pb[sup [minus]1] of data collected at the Collider Detector at Fermilab in [ital [bar p]p] collisions at [ital qrts]=1.8 TeV. We obtain [sigma][sub [ital B]]=1.5[plus minus]0.7(stat)[plus minus]0.6(syst) [mu]b for [ital B][sup 0] mesons with transverse momentum [ital P][sub [ital T]][gt]9.0 GeV/[ital c] and rapidity [vert bar][ital y][vert bar][lt]1.0. Using this result, we find [sigma][sub [ital b]]=3.7[plus minus]1.6(stat)[plus minus]1.5(syst) [mu]b for [ital b] quarks with [ital P][sub [ital T]][gt]11.5 GeV/[ital c] and rapidity [vert bar][ital y][vert bar][lt]1.0. The [ital b] quark cross section is compared to next-to-leading order QCD calculations and previous measurements.
19 citations
TL;DR: In this article, the authors measured the branching ratio of the collision data from the 1992-1993 run of the Collider Detector at Fermilab and derived a branching ratio for the top quark mass.
Abstract: We present a measurement of the ratio $\frac{\ensuremath{\sigma}B(W\ensuremath{\rightarrow}e\ensuremath{
u})}{\ensuremath{\sigma}B({Z}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})}$ in $\overline{p}p$ collisions at $\sqrt{s}=1.8$ TeV The data represent an integrated luminosity of 21.7 ${\mathrm{pb}}^{\ensuremath{-}1}$ from the 1992-1993 run of the Collider Detector at Fermilab. We find $\frac{\ensuremath{\sigma}B(W\ensuremath{\rightarrow}e\ensuremath{
u})}{\ensuremath{\sigma}B({Z}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})}=10.90\ifmmode\pm\else\textpm\fi{}0.32(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.29(\mathrm{syst})$. From this value, we extract a value for the $W$ width, $\ensuremath{\Gamma}(W)=2.064\ifmmode\pm\else\textpm\fi{}0.061(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.059(\mathrm{syst})$ GeV, and the branching ratio, $\frac{\ensuremath{\Gamma}(W\ensuremath{\rightarrow}e\ensuremath{
u})}{\ensuremath{\Gamma}(W)=0.1094\ifmmode\pm\else\textpm\fi{}0.0033(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0031(\mathrm{syst})}$, and we set a decay-mode-independent limit on the top quark mass ${m}_{\mathrm{top}}g62$ GeV/${\mathit{c}}^{2}$ at the 95% C.L.
16 citations
TL;DR: In this paper, the Drell-Yan differential cross section was measured over the mass range of 11.6 to 150 GeV/[ital c][sup 2] using dielectron and dimuon data from [ital [bar p]p] p] collisions at a center-of-mass energy of [radical][ital s] = 1.8 TeV.
Abstract: We measure the Drell-Yan differential cross section [ital d][sup 2][sigma]/[ital dM] d[ital y][vert bar][sub [vert bar][ital y][vert bar][lt]1] over the mass range 11[lt][ital M][lt]150 GeV/[ital c][sup 2] using dielectron and dimuon data from [ital [bar p]p] collisions at a center-of-mass energy of [radical][ital s] =1.8 TeV. Our results show the 1/[ital M][sup 3] dependence that is expected from the naive Drell-Yan model. In comparison to the predictions of recent QCD calculations we find our data favor those parton distribution functions with the largest quark contributions in the [ital x] interval 0.006 to 0.03.
10 citations
TL;DR: In this article, the results of a search in [ital [bar p] [ital p] collisions at [radical][ital s] = 1.8 TeV for the top quark decaying to a charged Higgs bosson ([ital H][sup [plus minus]]).
Abstract: We present the results of a search in [ital [bar p]] [ital p] collisions at [radical][ital s] =1.8 TeV for the top quark decaying to a charged Higgs bosson ([ital H][sup [plus minus]]). We search for dilepton final states from the decay chain [ital t] [ital [bar t]][r arrow][ital HH] (or [ital HW], or [ital WW])+[ital b] [ital [bar b]][r arrow][ital ll]+[ital X]. In a sample of 19.3 pb[sup [minus]1] collected during 1992--93 with the Collider Detector at Fermilab, we observe 2 events with a background estimation of 3.0[plus minus]1.0 events. Limits at 95% C.L. in the (M[sub top],M[sub [ital H][sup [plus minus]]]) plane are presented. For the case [ital M][sub top][lt][ital M][sub [ital W]]+[ital M][sub [ital b]], we exclude at 95% C.L. the entire ([ital M][sub top],[ital M][sub H[plus minus]]) plane for the branching ratio [ital B]([ital H][r arrow][tau][nu]) larger than 75%. We also interpret the results in terms of the parameter tan[beta] of two-Higgs-doublet models.
9 citations
TL;DR: In this article, the authors measured the angular distribution of the [ital W]+jet angular distribution using the Collider Detector at Fermilab (CDF) during 1988--89 and 1992--93 Tevatron runs.
Abstract: The [ital W]+jet angular distribution is measured using [ital W][minus][gt][ital e][nu] events recorded with the Collider Detector at Fermilab (CDF) during 1988--89 and 1992--93 Tevatron runs. The data agree well with both a leading order and a next-to-leading order theoretical prediction. The shape of the angular distribution is similar to that observed in photon+jet data, and significantly different from that observed in dijet data.
2 citations