At the Fermilab Tevatron proton-antiproton ($p\bar{p}$) collider, high-mass
electron-neutrino ($e\nu$) pairs are produced predominantly in the process $p
\bar{p} \rightarrow W(\rightarrow e\nu) + X$. ...The asymmetry of the electron and
positron yield as a function of their pseudorapidity constrain the slope of the
ratio of the $u$- to $d$-quark parton distributions versus the fraction of the
proton momentum carried by the quarks. This paper reports on the measurement of
the electron-charge asymmetry using the full data set recorded by the Collider
Detector at Fermilab in 2001--2011 and corresponding to 9.1~fb$^{-1}$ of
integrated luminosity. The measurement significantly improves the precision of
the Tevatron constraints on the parton-distribution functions of the proton.
Numerical tables of the measurement are provided.
We report on a search for a spin-zero non-standard-model particle in proton-antiproton collisions collected by the Collider Detector at Fermilab at a center-of-mass-energy of 1.96 TeV. This particle, ...the \(\phi\) boson, is expected to decay into a bottom-antibottom quark pair and to be produced in association with at least one bottom quark. The data sample consists of events with three jets identified as initiated by bottom quarks and corresponds to \(5.4~\text{fb}^{-1}\) of integrated luminosity. In each event, the invariant mass of the two most energetic jets is studied by looking for deviations from the multijet background, which is modeled using data. No evidence is found for such particle. Exclusion upper limits ranging from 20 to 2 pb are set for the product of production cross sections times branching fraction for hypothetical \(\phi\) boson with mass between 100 and 300 GeV/\(c^2\). These are the most stringent constraints to date.
Phys. Rev. D 98, 112005 (2018) This paper presents a study of the production of a single $W$ boson in
association with one or more jets in proton-antiproton collisions at
$\sqrt{s}=1.96$ TeV, using ...the entire data set collected in 2001-2011 by the
Collider Detector at Fermilab at the Tevatron, which corresponds to an
integrated luminosity of $9.0$ fb$^{-1}$. The $W$ boson is identified through
its leptonic decays into electron and muon. The production cross sections are
measured for each leptonic decay mode and combined after testing that the ratio
of the $W(\rightarrow \mu\nu)+$jets cross section to the $W(\rightarrow
e\nu)+$jets cross section agrees with the hypothesis of $e$-$\mu$ lepton
universality. The combination of measured cross sections, differential in the
inclusive jet multiplicity ($W+\geqslant N$ jets with $N=1,\,2,\,3, \textrm{or
}4$) and in the transverse energy of the leading jet, are compared with
theoretical predictions.
Phys. Rev. Lett. 120, 202006 (2018) A search for the exotic meson $X(5568)$ decaying into the $B^0_s \pi^{\pm}$
final state is performed using data corresponding to $9.6 \textrm{fb}^{-1}$
from ...$p{\bar p}$ collisions at $\sqrt{s} = 1960$ GeV recorded by the Collider
Detector at Fermilab. No evidence for this state is found and an upper limit of
6.7\% at the 95\% confidence level is set on the fraction of $B^0_s$ produced
through the $X(5568) \rightarrow B^0_s \, \pi^{\pm}$ process.
At the Fermilab Tevatron proton-antiproton (\(p\bar{p}\)) collider, high-mass electron-neutrino (\(e\nu\)) pairs are produced predominantly in the process \(p \bar{p} \rightarrow W(\rightarrow e\nu) ...+ X\). The asymmetry of the electron and positron yield as a function of their pseudorapidity constrain the slope of the ratio of the \(u\)- to \(d\)-quark parton distributions versus the fraction of the proton momentum carried by the quarks. This paper reports on the measurement of the electron-charge asymmetry using the full data set recorded by the Collider Detector at Fermilab in 2001--2011 and corresponding to 9.1~fb\(^{-1}\) of integrated luminosity. The measurement significantly improves the precision of the Tevatron constraints on the parton-distribution functions of the proton. Numerical tables of the measurement are provided.
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