Electroweak Boson Pair Production at the Tevatron PDF Download

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Languages : en
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Author: Gilles De Lentdecker
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Languages : en
Pages : 8

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The authors present some precision measurements on electroweak physics performed at the Tevatron collider at Fermilab. Namely they report on the boson-pair production cross sections and on triple gauge boson couplings using proton anti-proton collisions collected by the CDF and D0 experiments at the center-of-mass energy of 1.96 TeV. The data correspond to an integrated luminosity of up to 324 pb{sup -1}.

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Languages : en
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Preliminary results from CDF on W + [gamma], Z + [gamma] and W[sup +]W[sup [minus]], WZ, ZZ boson pair production in [radical]s = 1.8 TeV [anti p]-p collisions from the 1992--93 collider run are presented. Measurements of the production cross section [times] decay branching ratios [sigma] * B(W + [gamma]) and [sigma] * B(Z + [gamma]) have been obtained. The cross section ratios R(W[gamma]/W), R(Z[gamma]/Z), R(W[gamma]/Z[gamma]) and R(W/Z) are discussed. The authors extract direct limits on CP-conserving and CP-violating WW[gamma], WWZ, ZZ[gamma] and Z[gamma][gamma] anomalous couplings. In the static limit, the direct experimental limits on WW[gamma] and ZZ[gamma] anomalous couplings are related to bounds on the higher-order static (transition) EM moments of the W (Z) bosons. Expectations from the on-going and future Tevatron collider runs are discussed.

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Languages : en
Pages : 21

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An overview of recent electroweak physics results from the Tevatron is given. Properties of the W{sup {+-}} and Z° gauge bosons using final states containing electrons and muons based on large integrated luminosities are presented. In particular, measurements of the W{sup {+-}} and Z° production cross sections, the W-charge asymmetry and the measurement of the W-mass are summarized. Gauge boson self interactions are measured by studying gauge boson pair production and Emits on anomalous gauge boson couplings are discussed.

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Languages : en
Pages : 6

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The 1992--1993 Tevatron collider run ended yesterday. [approx]21 (16)pb[sup [minus]1] of p[bar p] collisions at [radical]S = 1800 GeV were collected at CDF (D0). New measurements of the W and Z cross section x branching ratios indicate that [Gamma](W) is 2.033 [plus-minus] 0.069 [plus-minus] 0.057 GeV. The upper limit for the top quark mass, if it is produced in W decays, is 62 GeV/c[sup 3]. Gauge boson pair production studies are beginning to constrain electro-weak parameters. No neutral gauge bosons with mass> M[sub z] have appeared. Inclusive jet production and angular distribution studies are compared to NLO perturbative QCD predictions. A new topological jet analysis from CDF is sensitive to the low x gluon distribution. The direct photon cross section shows a steeper fall-off with E[sub t] than does the theory prediction. D0 has one candidate t[bar t] event in the dilepton mode. The lower limit on M[sub T[sub op]] has been raised to 99 GeV/c[sup 2].

Author: Stefan Roth
Publisher: Springer
ISBN: 3540351655
Category : Science
Languages : en
Pages : 181

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This book reviews recent contributions of electron positron colliders to the precision test of the electroweak Standard Model. It includes a short summary of the measurements at the Z resonance and gives an overview of the electroweak processes above the Z. Subsequently, measurements of the W mass at LEP are discussed in detail. Late chapters offer an outlook on electroweak physics at the future LHC. Also features many illustrations and tables.

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Languages : en
Pages : 22

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Using data collected from p{anti p} collisions at the Fermilab Tevatron collider the latest electroweak results from the CDF and D0 collaborations are presented. Measurements of the W and Z boson production cross sections are detailed, which in addition to testing the Standard Model in their own right also allow a determination of the W boson width. Analyses of Drell-Yan production above the Z pole allow limits to be placed on the existence of neutral gauge bosons beyond the Standard Model and parton compositeness. A first measurement of the forward backward asymmetry of the Drell-Yan lepton pairs above the Z pole is also presented. The latest measurements from both collaborations of the W mass are described, which when averaged yield a W mass value of 80.375 " 0.100 GeV/c2.

Author: Arno Straessner
Publisher: Springer
ISBN: 3642051693
Category : Science
Languages : en
Pages : 222

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During more than 10 years, from 1989 until 2000, the LEP accelerator and the four LEP experiments, ALEPH, DELPHI, L3 and OPAL, have taken data for a large amount of measurements at the frontier of particle physics. The main outcome is a thorough and successful test of the Standard Model of electroweak interactions. Mass and width of the Z and W bosons were measured precisely, as well as the Z and photon couplings to fermions and the couplings among gauge bosons. The rst part of this work will describe the most important physics results of the LEP experiments. Emphasis is put on the properties of the W boson, which was my main research eld at LEP. Especially the precise determination of its mass and its couplings to the other gauge bosons will be described. Details on physics effects like Colour Reconnection and Bose-Einstein Correlations in W-pair events shall be discussed as well. A conclusive summary of the current electroweak measurements, including low-energy results, as the pillars of possible future ndings will be given. The important contributions from Tevatron, like the measurement of the top quark and W mass, will round up the present day picture of electroweak particle physics. This is an open access book.

Author: Csaba Balázs
Publisher:
ISBN:
Category : Electroweak interactions
Languages : en
Pages : 550

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