We present a measurement of the inclusive jet cross section in {ital {bar p}p} collisions at {radical}{ital s} =1.8 TeV at the Fermilab Tevatron using the Collider Detector at Fermilab. Good ...agreement is seen with the predictions of recent next-to-leading-order ({ital O}({alpha}{sub {ital s}}{sup 3})) QCD predictions. The dependence of the cross section on clustering cone size is reported for the first time. An improved limit on {Lambda}{sub {ital c}}, a term characterizing possible quark substructure, is set at 1.4 TeV (95% C.L.).
We present results from searches for the top quark {ital p{bar p}} collisions at the Fermilab Tevatron Collider. The data sample was collected during 1988--89 with the Collider Detector at Fermilab ...and has an integrated luminosity of 4.1 pb{sup {minus}1}. Our previous search for {ital e}{mu} final states for {ital t{bar t}}{r arrow}{ital e}{nu}{ital b} {mu}{nu}{ital {bar b}} decays has been extended to include the {ital ee} and {mu}{mu} channels. In addition, we have searched in each event with a high-transverse-momentum lepton accompanied by hadron jets for a low-transverse-momentum muon as a tag of a bottom quark in {ital t{bar t}}{r arrow}{ital l}{nu}{ital bq{bar q}{bar b}} decays. A lower limit on the top-quark mass of 91 GeV/{ital c}{sup 2} is obtained at the 95% confidence level, assuming standard model decays.
Phys.Rev.Lett. 87 (2001) 242002 The collider experiments at the Tevatron and the LHC will allow for detailed
investigations of the properties of the top quark. This requires precise
predictions of ...the hadronic production of $t\bar t$ pairs and of their
subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p
\to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton
angular distribution at next-to-leading order (NLO) in the QCD coupling,
keeping the full dependence on the spins of the intermediate $t\bar{t}$ state.
The angular distribution reflects the degree of correlation of the $t$ and
$\bar t$ spins which we determine for different choices of $t$ and $\bar t$
spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and
the distribution is quite sensitive to the parton content of the proton.
Phys.Lett. B509 (2001) 53-58 We have computed the cross section for $t\bar t$ production by gluon-gluon
fusion at next-to-leading order (NLO) in the QCD coupling, keeping the full
dependence on the ...$t\bar t$ spins. Furthermore we have determined to the same
order the spin dependent cross sections for the processes $g + q ({\bar q})\to
t {\bar t} + q ({\bar q})$. Together with our previous results for $q + {\bar
q} \to t {\bar t} (g)$ these results allow for predictions, at NLO QCD, of the
hadronic production of $t\bar t$ pairs in a general spin configuration. As an
application we have determined the degree of correlation of the $t$ and $\bar
t$ spins at NLO, using various spin quantisation axes.
As part of a taxonomic study of cultivated Brassica, B. rapa L. is lectotypified by a Matthiolus illustration, the lectotype of B. campestris L., chosen by Jonsell, is restricted to a single specimen ...in LINN and a neotype is designated for B. chinensis L. from the Bailey Herbarium.
The {ital W}{prime} is a charged, heavy, vector boson predicted to exist by some extensions of the standard model. We have searched for the processes {ital W}{prime}{r arrow}{ital e}{nu} and {ital ...W}{prime}{r arrow}{mu}{nu} for {ital M}{sub {ital W}{prime}}{gt}100 GeV/{ital c}{sup 2}, in {ital {bar p}p} collisions at {radical}{ital s} =1.8 TeV, using data taken with the Collider Detector at Fermilab. The nonobservation of these processes leads to a lower limit of 520 Gev/{ital c}{sup 2} (95% confidence level) on the mass of the {ital W}{prime}, assuming standard-strength couplings to three fermion generations.
Future hadron collider experiments will allow for a detailed investigation of \(t\bar{t}\) spin correlation effects. In this talk, recent progress in the theoretical description of these effects is ...reported. In particular, next-to-leading order results for the \(t\bar t\) spin correlations in \(q\bar{q}\to t\bar{t}X\) are presented, using various spin quantization axes.
