We present the first measurement of the jet pseudorapidity distribution in direct photon events from a sample of pp¯ collisions at s=1.8TeV, recorded with the Collider Detector at Fermilab. Quantum chromodynamics (QCD) predicts that these events are primarily from hard quark-gluon Compton scattering, qg→qγ, with the final state quark producing the jet of hadrons. The jet pseudorapidity distribution in this model is sensitive to parton momentum fractions between 0.015 and 0.15. We find that the shape of the measured pseudorapidity distribution agrees well with next-to-leading order QCD calculations.Received 14 August 1997DOI:https://doi.org/10.1103/PhysRevD.57.1359©1998 American Physical Society

Pseudorapidity

10.1103/physrevd.57.1359

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Citations (3)

Measurement of the ratio σ(W→eν)/σ(Z→ee) inp¯pcollisions at√s =1.8TeV

Physical Review Letters (1990)

F. Abe D. Amidei G. Apollinari M. Ataç P. Auchincloss

An analysis of W- and Z-boson production using data from the Collider Detector at Fermilab at \ensuremath{\surd}s =1.8 TeV yields \ensuremath{\sigma}(W\ensuremath{\rightarrow}ev)/\ensuremath{\sigma}(Z\ensuremath{\rightarrow}ee)=10.2\ifmmode\pm\else\textpm\fi{}0.8(stat)\ifmmode\pm\else\textpm\fi{}0.4(syst). The width of the W boson, \ensuremath{\Gamma}(W), and a limit on the top-quark mass independent of decay mode are extracted from this measurement.

Fermilab

Electron–positron annihilation

10.1103/physrevlett.64.152

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Citations (30)

Adipose tissue compensates for defect of phosphatidylinositol 3′-kinase induced in liver and muscle by dietary fish oil in fed rats

AJP Endocrinology and Metabolism (2005)

Charlotte Corporeau Christelle Le Foll Mohammed Taouis Jean‐Paul Gouygou J. P. Bergé

The present work aimed to study in rats whether substitution of a low level of fish oil (FO; 2.2% of calories) into a low-fat diet (6.6% of calories from fat as peanut-rape oil or control diet) 1) has a tissue-specific effect on insulin signaling pathway and 2) prevents dexamethasone-induced alteration of insulin signaling in liver, muscle, and adipose tissue. Sixteen rats were used for study of insulin signaling, and sixteen rats received an oral glucose load (3 g/kg). Eight rats/group consumed control diet or diet containing FO over 5 wk. Four rats from each group received a daily intraperitoneal injection of saline or dexamethasone (1 mg.kg(-1).day(-1)) for the last 5 days of feeding. In liver, FO decreased phosphatidylinositol 3'-kinase (PI 3'-kinase) activity by 54% compared with control diet. A similar result was obtained in muscle. In both liver and muscle, FO clearly amplified the effect of dexamethasone. FO did not alter early steps of insulin signaling, and in muscle GLUT4 protein content remained unaltered. In adipose tissue, FO increased PI 3'-kinase activity by 74%, whereas dexamethasone decreased it by 65%; inhibition of PI 3'-kinase activity by dexamethasone was similar in rats fed FO or control diet, and GLUT4 protein content was increased by 61% by FO. Glycemic and insulinemic responses to oral glucose were not modified by FO. In conclusion, FO increased PI 3'-kinase activity in adipose tissue while inhibiting it in liver and muscle. The maintenance of whole body glucose homeostasis suggests an important role of adipose tissue for control of glucose homeostasis.

GLUT4

Calorie

10.1152/ajpendo.00200.2005

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Citations (29)

Dijet Production by Double Pomeron Exchange at the Fermilab Tevatron

Physical Review Letters (2000)

A. A. Affolder H. Akimoto A. Akopian M. G. Albrow P. Amaral

We report the first observation of dijet events with a double Pomeron exchange topology produced in &pmacr;p collisions at sqrt[s] = 1800 GeV. The events are characterized by a leading antiproton, two jets in the central pseudorapidity region, and a large rapidity gap on the outgoing proton side. We present results on jet kinematics and production rates, compare them with corresponding results from single diffractive and inclusive dijet production, and test factorization.

Pseudorapidity

Pomeron

Fermilab

Antiproton

10.1103/physrevlett.85.4215

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Citations (55)

Study of the Reactionsνp→μ−Δ++at High Energies and Comparisons with Theory

Physical Review Letters (1978)

John Bell J. P. Bergé D. Bogert R. J. Cence C. T. Coffin

We present production and decay distributions for the reaction $\ensuremath{\nu}p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}p{\ensuremath{\pi}}^{+}$ with ${M}_{{\ensuremath{\pi}}^{+}p}<1.4$ GeV. This reaction is primarily $\ensuremath{\nu}p\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\Delta}}^{++}$, but we find evidence for the presence of non-$\ensuremath{\Delta}$ amplitudes for ${Q}^{2}>1$ Ge${\mathrm{V}}^{2}$. The data are fitted by various theoretical models. For ${Q}^{2}<1$ Ge${\mathrm{V}}^{2}$ the best fit yields the value ${M}_{A}={1.25}_{\ensuremath{-}0.13}^{+0.15}$ GeV, using a dipole-nucleon axial-vector form factor in Adler's model, although none of these models successfully reproduces the observed $\ensuremath{\Delta}$-decay distributions.

10.1103/physrevlett.41.1012

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Citations (38)

Search for a Fourth-Generation Quark More Massive than theZ0Boson inpp<…

Physical Review Letters (2000)

T. Affolder H. Akimoto A. Akopian M. Albrow P. Amaral

We present the results of a search for pair production of a fourth-generation charge $\ensuremath{-}\frac{1}{3}$ quark $({b}^{\ensuremath{'}})$ in $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ $p\overline{p}$ collisions using $88{\mathrm{pb}}^{\ensuremath{-}1}$ of data obtained with the Collider Detector at Fermilab. We assume that both quarks decay via the flavor-changing neutral current process ${b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0}$ and that the ${b}^{\ensuremath{'}}$ mass is greater than ${m}_{Z}{+m}_{b}$. We studied the decay mode ${b}^{\ensuremath{'}}\overline{{b}^{\ensuremath{'}}}\ensuremath{\rightarrow}{Z}^{0}{Z}^{0}b\overline{b}$ where one ${Z}^{0}$ decays into ${e}^{+}{e}^{\ensuremath{-}}$ or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and the other decays hadronically, giving a signature of two leptons plus jets. An upper limit on the ${\ensuremath{\sigma}}_{p\overline{p}\ensuremath{\rightarrow}{b}^{\ensuremath{'}}\overline{{b}^{\ensuremath{'}}}}\ifmmode\times\else\texttimes\fi{}[B({b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0}){]}^{2}$ is established as a function of the ${b}^{\ensuremath{'}}$ mass. We exclude at $95%$ confidence level a ${b}^{\ensuremath{'}}$ quark with mass between 100 and $199\mathrm{GeV}{/c}^{2}$ for $B({b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}100%$.

10.1103/physrevlett.84.835

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Citations (27)

Search for Scalar Top and Scalar Bottom Quarks inpp¯Collisions ats

Physical Review Letters (2000)

A. A. Affolder H. Akimoto A. Akopian M. G. Albrow P. Amaral

We have searched for direct pair production of scalar top and scalar bottom quarks in 88 pb-1 of pp collisions at sqrt[s]=1.8 TeV with the CDF detector. We looked for events with a pair of heavy flavor jets and missing energy, consistent with scalar top (bottom) quark decays to a charm (bottom) quark and a neutralino. The numbers of events that pass our selections show no significant deviation from standard model expectations. We compare our results to the next-to-leading order scalar quark production cross sections to exclude regions in scalar quark-neutralino mass parameter space.

Pair production

10.1103/physrevlett.84.5704

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Citations (52)

DECAY $Xi$$sup -$ $Yields$ $lambda$$sup 0$e$sup -$ anti upsilon.

John P. Hubbard J. P. Bergé P.M. Dauber

Source

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Proposal to study neutral current neutrino and anti-neutrino interactions in the 15 foot bubble chamber using the external muon identifier and a dichromatic beam

R. J. Cence P.H. Eberhard A. Barbaro‐Galtieri S. I. Parker Frank T. Solmitz

Bubble chamber

Source

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Search for a light Higgs boson at the Fermilab Tevatron proton-antiproton collider

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (1990)

F. Abe D. Amidei G. Apollinari M. Ataç P. Auchincloss

We have searched for a light standard-model Higgs boson produced in association with an intermediate vector boson at the Fermilab proton-antiproton collider operating at a center-of-mass energy of 1.8 TeV. The search was made by looking for an excess of isolated high-transverse-momentum charged-track pairs in $W$ and $Z$ events. A Higgs boson with a mass ${m}_{H}$ in the intervals $2{m}_{\ensuremath{\mu}}<{m}_{H}<818$ MeV/${\mathit{c}}^{2}$, and $846 \frac{\mathrm{MeV}}{{c}^{2}}<{m}_{H}<2{m}_{K}$ is excluded at 90% C.L.

Fermilab

Antiproton

10.1103/physrevd.41.1717

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Citations (3)