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Inclusive jet and direct photon production at the D0 experiment

Description: Preliminary measurements of the inclusive jet and single photon production cross sections in p{bar p} collisions at {radical}{bar s} = 1.8 TeV by the D0 experiment at the Fermilab Tevatron are reported. The inclusive jet cross sections in various pseudorapidity ranges covering {vert_bar}{eta}{vert_bar} < 3 are presented, along with comparisons to next-to-leading order QCD predictions. The single photon cross section in the central region ({vert_bar}{eta}{vert_bar} < 0.9) is also presented, as i… more
Date: December 1, 1993
Creator: Kotcher, J.
Partner: UNT Libraries Government Documents Department
open access

Electroweak physics from D0

Description: The D0 detector was recently commissioned at the Tevatron p{bar p} collider and is presently taking data. Preliminary results from D0 are presented on properties of the W and Z electroweak gauge bosons, using final states containing electrons and muons.
Date: May 1, 1993
Creator: Roe, N. A.
Partner: UNT Libraries Government Documents Department
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Measurement of inclusive triple differential dijet cross section, d{sup 3}{sigma}/dE{sub T}d{eta}{sub 1}d{eta}{sub 2} in p{bar p} collisions at {radical}s = 1.8 TeV

Description: Measurement of the inclusive triple differential dijet cross section, d{sup 3}{sigma}/dE{sub T}d{sub {eta}1}d{sub {eta}2}, at a center of mass energy {radical}s = 1.8 TeV with the D0 detector during the 1992--1993 run. The sensitivity of this measurement to different parton distribution functions is explored. A comparison of the data to NLO theory using different parton distributions functions indicates the need for a smaller gluon content in the x range accessible at the Tevatron than is predi… more
Date: July 1995
Creator: Abachi, S.
Partner: UNT Libraries Government Documents Department
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Measurement of B{sup 0} {minus} {bar B}{sup 0} mixing using dimuons at D0

Description: The D0 experiment at Fermilab has determined the B{sup 0} {minus} B{sup 0} mixing probability x using dimuon events produced in p{bar p} collisions at {radical}s = 1.8 TeV. Using a sample of 172 dimuon events, we have determined the time and flavor averaged mixing probability x to be 0.09 {plus_minus} 0.04(stat){plus_minus}0.03(sys) [preliminary] in agreement with the present world average.
Date: July 1995
Creator: Abachi, S.
Partner: UNT Libraries Government Documents Department
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Search for squarks and gluinos in p{bar p} collisions at the D0 detector

Description: A search for squarks and gluinos has been performed using the D0 detector at the {radical}s = 1.8 TeV Tevatron p{bar p} collider. Data from the 1992--1993 collider run corresponding to an integrated luminosity of 13.5 pb{sup {minus}1} were examined via the missing E{sub T} plus jets signature with two separate analyses. No events above Standard Model backgrounds were observed.
Date: July 1, 1995
Creator: D0 Collaboration
Partner: UNT Libraries Government Documents Department
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The search for squarks, gluinos and stop squarks in D0

Description: Searches through data collected by D0 at Fermilab during the 1992-- 1993 p {bar p} collider run for the supersymmetric partners to the quark and the gluon, the squark and gluino, including a low mass scalar top squark, are reviewed. A set of classic searches were conducted for missing E{sub T} plus jets signatures. No evidence of positive signals is reported, but limits are set on the squark and gluino masses.
Date: August 1, 1995
Creator: Claes, D.
Partner: UNT Libraries Government Documents Department
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Study of B{sup 0}-{bar B}{sup 0} mixing in D0

Description: The probability of B{sup 0}-{bar B}{sup 0} mixing has been measured using the D{O} detector. Non-isolated dimuon events are used to determine the ratio of like to unlike-sign pairs. The measured ratio is 0.48 {+-} 0.04(stat.) {+-} 0.03(syst.), compared with the expected value of 0.23 {+-} 0.07 in the absence of B{sup 0}-{bar B}{sup 0} mixing. The combined mixing probability is measured to be 0.13 {+-} 0.02(stat.) {+-} 0.05(syst.) in good agreement with other experimental measurements.
Date: December 1, 1993
Creator: Igarashi, S.
Partner: UNT Libraries Government Documents Department
open access

A Search for Rapidity Gaps in Jet Events and a Study of Color Coherence in Multijet Events at D0

Description: The authors present studies of Rapidity Gaps and Color Coherence in jet events at the DO Detector for data taken during the recent Tevatron collider run at {radical}s = 1.8 TeV. An upper limit of f({Delta}{eta}{sub c} > 3) < 1.2 {times} 10{sup {minus}2} {at} 95% C.L. on the true rapidity gap fraction is given. The color coherence results indicate the angle ordering approximation as modeled in the Herwig Monte Carlo represents the collider as well.
Date: December 1993
Creator: Borcherding, Fred
Partner: UNT Libraries Government Documents Department
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Performance of a large scale scintillating fiber tracker using VLPC readout

Description: The authors report on results of a cosmic-ray test of a 3,072 channel scintillating fiber tracker using VLPC readout. This system is a prototype for the D0 detector tracking upgrade, and represents a configuration that is similar to that planned for the final detector. A detailed description of the cosmic ray test, including trigger, fiber configuration, lightguides, VLPC cassettes and cryogenics, calibration system, and DAQ is given. Tracking results with a muon momentum cutoff of 2.5 GeV/c in… more
Date: September 1, 1994
Creator: D0 Collaboration
Partner: UNT Libraries Government Documents Department
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VLPC characterization for the Dzero upgrade

Description: The authors have studied the performance characteristics of approximately 4,000 Visible Light Photon Counters (VLPC) over a range of operating temperatures and biases. They will describe the characterization procedure and present the measured gain, noise, and relative quantum efficiency for the devices. They will also discuss the general operation of the devices and the significant problems encountered during the characterization.
Date: September 1, 1994
Creator: D0 Collaboration
Partner: UNT Libraries Government Documents Department
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Measurement of W and Z production cross-sections in p{bar p} collisions at {radical}s = 1.8 TeV

Description: The cross sections for W and Z production in p{bar p} collisions at {radical}s = 1.8 TeV are measured using the D0 detector at the Fermilab Tevatron collider. The detected final states are W {yields} ev{sub e}, Z {yields} e{sup +}e{sup {minus}}, W {yields} {mu}v{sub {mu}}, and Z {yields} {mu}{sup +}{mu}{sup {minus}}. In the ratio of these measurements, many common sources of systematic error cancel and we measure R = {sigma},(p{bar p} {yields} W) {center_dot} Br(W {yields} lv)/ {sigma},(p{bar p… more
Date: September 1, 1994
Creator: Quintas, P. Z.
Partner: UNT Libraries Government Documents Department
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Bottom-quark production from muon-jet and dimuon events in p{bar p}-interactions at {radical}s = 1.8 TeV

Description: Bottom quark production in p{bar p}-interactions has been measured in the rapidity range {vert_bar} y{sup b} {vert_bar} < 1 with the DO detector at the Fermilab Tevatron collider. The cross section is determined from events containing a muon and jets as well as from dimuon events. Preliminary results are presented based on 197 nb{sup {minus}1} and 6.4 pb{sup {minus}1} of data for the muon-jets and dimuon analysis, respectively, and are compared to next-to-leading order QCD predictions. The meas… more
Date: September 1, 1994
Creator: Huehn, T.
Partner: UNT Libraries Government Documents Department
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Observation of the top quark

Description: The D0 collaboration reports on a search for the Standard Model top quark in p{bar p} collisions at {radical}s = 1.8 TeV at the Femlilab Tevatron, with an integrated luminosity of approximately 50 pb{sup {minus}1}. We have searched for t{bar t} production in the dilepton and single-lepton decay channels, with and without tagging of b quark jets. We observe 17 events with an expected background of 3.8 {plus_minus} 0.6 events. The probability for an upward fluctuation of the background to produce… more
Date: May 1, 1995
Creator: Thompson, J.
Partner: UNT Libraries Government Documents Department
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D0 top quark cross section for the 1992--1995 tevatron run

Description: We present a measurement of the t{bar t} cross section in p{bar p} collisions at {radical}s = 1.8 TeV using dilepton and single lepton final states. This analysis uses about 100 pb{sup -1} of data collected with the D0 detector at Fermilab during the 1992-1995 run. Analyses in two other final states are also presented. 13 refs., 3 figs., 2 tabs.
Date: October 1, 1996
Creator: Bantly, J.
Partner: UNT Libraries Government Documents Department
open access

Dijet angular distributions at D0

Description: Measurements of the dijet angular distributions are relatively insensitive to parton distribution functions and thus offer an excellent method of testing the LO and NLO predictions of perturbative QCD. The authors present measurements of the dijet angular distributions for {vert_bar}{eta}{vert_bar} < 3.0 in p{anti p} collisions at {radical}s = 1.8 TeV.
Date: September 1, 1996
Creator: Fatyga, M.K.
Partner: UNT Libraries Government Documents Department
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Search for a fourth generation charge {minus}1/3 quark via flavor changing neutral currents

Description: There is some likelihood that a light (< m{sub t}) fourth generation charge -1/3 quark (b{prime}) would decay predominantly via loop induced flavor changing neutral currents. The charged current decay of b{prime} to charm would be highly Cabibbo suppressed due to the fact that it changes the generation number by two. The D0 experiment has searched for b{prime} pair production where one or both b{prime} quarks decays via b{prime} {r_arrow} b+{gamma}, giving signatures photon + three jets and two… more
Date: July 1, 1996
Creator: D0 Collaboration
Partner: UNT Libraries Government Documents Department
open access

Measurement of the t {anti t} cross section at D0

Description: We have measured the t{anti t} cross-section in p{anti p} collisions at {radical}s = 1.8 TeV using dilepton and single lepton final states. This analysis uses approximately 106 pb{sup -1} of data collected with the D0 detector at Fermilab during the 1992-1996 run. We observe 37 events with an expected background of 13.4 {+-} 3.4 events, giving {sigma}{sub t{anti t}} of 5.3 {+-} 1.8 pb for m{sub t} = 169 GeV. 4 refs., 1 fig., 1 tab.
Date: August 1, 1996
Creator: Kehoe, R.L.
Partner: UNT Libraries Government Documents Department
open access

Studies of QCD at the Tevatron with the D0 detector

Description: QCD studies at Fermilab`s Tevatron encompass a rich variety of topics. We present some of the latest results from the D0 experiment including probes of the standard model given by the inclusive jet cross section, the dijet invariant mass spectrum and several studies with direct photons. To complement these probes, we also present new results from precision examinations of the color interactions including studies of color coherence and jet azimuthal decorrelation. 22 refs., 14 figs.
Date: December 1, 1996
Creator: Stephens, R.W.
Partner: UNT Libraries Government Documents Department
open access

A measurement of the ratio of W + 1 jet to W + 0 jets cross sections and comparisons to QCD

Description: A preliminary measurement of the ratio, R{sup 10}, of the production cross sections for W + 1 Jet and W + 0 Jets processes at {radical}s = 1,800 GeV by the D0 Collaboration is presented. A comparison of this ratio is made to next-to-leading order calculations and the implications of these comparisons, especially for the extraction of a value for the strong coupling constant {alpha}{sub s}(M{sub W}{sup 2}), are discussed.
Date: July 1996
Creator: Abachi, S.
Partner: UNT Libraries Government Documents Department
open access

Top quark physics at the D0 experiment

Description: In this paper I present the latest results on top quark physics from the D0 collaboration since the discovery of the top quark in March 1995. I summarize the discovery results, discuss progress since the discovery, and show how we can measure the top quark mass using three separate techniques. The measurements were made at the Fermilab Tevatron, a p{bar p} collider with {radical}s = TeV, using {approximately}50 pb{sup {minus}1} data collected from 1992 to early 1995.
Date: January 1, 1996
Creator: Heinson, A.P.
Partner: UNT Libraries Government Documents Department
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Studies of the top quark with the D0 detector

Description: The observation of the top quark by the D0 experiment, at Fermilab`s Tevatron proton-antiproton collider, is briefly reviewed. The analysis of the top quark mass in the lepton plus jets decay channels, resulting in m{sub t} {approx} 200 GeV/c{sup 2} is reviewed; and a preliminary mass analysis from the dilepton decay channels resulting in m{sub t} = 145 {plus_minus} 25 (statistical) {plus_minus} 20 (systematic) GeV/c{sup 2} is presented. These mass measurements are compared with Standard Model … more
Date: January 1, 1996
Creator: Stephens, R.W.
Partner: UNT Libraries Government Documents Department
open access

Recent QCD results from the Tevatron

Description: Recent QCD results from the CDF and D0 detectors at the Tevatron proton-antiproton collider are presented. An outlook for future QCD tests at the Tevatron collider is also breifly discussed. 27 refs., 11 figs.
Date: February 1, 1997
Creator: Pickarz, Henryk
Partner: UNT Libraries Government Documents Department
open access

The dijet mass spectrum with the D0 detector

Description: The authors present preliminary results from an analysis of dijet data collected during the 1994--1995 Tevatron Collider run with an integrated luminosity of 91 pb{sup {minus}1}. Measurements of dijet mass spectrum distributions in {anti p}p collisions at {radical}s = 1.8 TeV are compared with next-to-leading order QCD theory.
Date: September 1, 1996
Creator: Choi, S.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the top quark mass at D0

Description: The mass of the top quark is measured using a sample of 93 lepton + 4 or more jets events collected with the D0 detector at the FNAL Tevatron collider. The authors find the top quark mass is 169 {+-} 8(stat.) {+-} 8(syst.) GeV/c{sup 2}. The analysis assumes that top quarks are produced as t{anti t} pairs that decay to W bosons and b quarks. The final states result when one W decays to e{nu} or {mu}{nu} and the other W to q{anti q}. More than four jets may be present because of final and initial… more
Date: December 31, 1996
Creator: Protopopescu, S.
Partner: UNT Libraries Government Documents Department
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