Forward-backward Asymmetries in W and Z Decays
Forward-backward Asymmetries in W and Z Decays

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Published: 1984

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The leptons emitted in decays of W and Z bosons produced in pp or anti pp collisions exhibit characteristic asymmetries with respect to the beam direction, as measured in the W or Z center-of-mass. The asymmetries appear in both pp and anti pp collisions. For anti pp collisions they appear to be approximately constant over the whole y range for values of M/.sqrt.s greater than or equal to 0.1. For smaller values of M/.sqrt.s, the asymmetries become more and more washed out in the central region as sea-sea collisions begin to play a larger role in gauge boson formation.

The Physics of the Z and W Bosons
The Physics of the Z and W Bosons

Author: Roberto Tenchini

Publisher: World Scientific

Published: 2008

Total Pages: 436

ISBN-13: 9812707026

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This book describes the memorable theoretical work that motivated the construction of the electron-positron accelerators at CERN and SLAC, and the monumental experimental effort that led to a verification of the main theoretical expectations at these laboratories and at Fermilab.The aim is to provide a description of the theoretical work, as well as a synthesis of the experimental effort, which makes interesting reading for both theorists and experimentalists. In particular, the experimental measurements, discussed in the second part of the book, are systematically related to the theoretical quantities discussed in the first. The topics still to be investigated, unsolved problems, and the perspectives at future giant accelerators conclude this fascinating text.

A Measurement of Sine(2)theta(W) from the Forward-backward Asymmetry in Proton-antiproton Going to Z Boson Positron-electron Interactions at Sqrt.s
A Measurement of Sine(2)theta(W) from the Forward-backward Asymmetry in Proton-antiproton Going to Z Boson Positron-electron Interactions at Sqrt.s

Author: Peter Todd Hurst

Publisher:

Published: 1990

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An analysis of the forward-backward asymmetry in Z$sp{0}$ decays using data from the Collider Detector at Fermilab provides a measurement of sin$sp2barthetasb{rm W}$. The forward-backward asymmetry is measured to be (5.2 $pm$ 5.9 (stat) $pm$ 0.4 (sys))%, which implies sin$sp2barthetasb{rm W}$ = 0.288$sbsp{-0.015}{+0.017}$ (stat) $pm$ 0.002 (sys), after QCD, QED, and weak corrections. When higher order weak corrections are included, the measured value of sin$sp2thetasb{rm W}$ is consistent with previous measurements over a broad range of top quark masses.

A Measurement of the Forward - Backward Asymmetry and $sin^2 \theta_{W}$ from the Process $Z^{0} \to \mu^ + \mu^-$ at $\sqrt{s}$
A Measurement of the Forward - Backward Asymmetry and $sin^2 \theta_{W}$ from the Process $Z^{0} \to \mu^ + \mu^-$ at $\sqrt{s}$

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Published: 1992

Total Pages: 242

ISBN-13:

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A measurement of the forward-backward charge asymmetry in the decay of Z0 bosons produced from $\bar{p}$ collisions at √s = 1.8 TeV at the Fermilab Tevatron collider, and decaying to [mu]+[mu]- pairs is presented. From this asymmetry, a value for the Weinburg angle, sin2[theta]w, is extracted and compared to values from other experiments.

Z Boson Asymmetry Measurements at the Tevatron
Z Boson Asymmetry Measurements at the Tevatron

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Published: 2014

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We present measurements of the forward-backward asymmetry (A_fb) in dilepton pair decays of Z bosons produced in ppbar collisions using the full Tevatron dataset. The CDF experiment extracts a value for the effective weak mixing angle parameter sin^{2}\theta^{l}_{eff} of 0.2315 +/- 0.0010 from the A_fb distribution of dimuon events in 9.2 fb^{-1} of integrated luminosity. From dielectron events in 9.7 fb^{-1} of data, the D0 experiment finds sin^{2}\theta^{l}_{eff} = 0.23106 +/- 0.00053, the world's most precise measurement of sin^{2}\theta^{l}_{eff} from hadron colliders and with light quark couplings.

High Energy Physics And Cosmology - Proceedings Of The 1993 Summer School
High Energy Physics And Cosmology - Proceedings Of The 1993 Summer School

Author: E Gava

Publisher: World Scientific

Published: 1994-06-28

Total Pages: 494

ISBN-13: 9814551643

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This symposium was organized in order to discuss recent developments and future perspectives in intermediate-energy heavy-ion physics. The subjects included sub-barrier fusion, superheavy elements, fission; halo, skin nuclei; multi-fragmentation, collective flow, compression; properties of hot nuclei; high spin and exotic nuclear shapes; nuclear astrophysics; applications; facilities.

Electroweak Symmetry Breaking And New Physics At The Tev Scale
Electroweak Symmetry Breaking And New Physics At The Tev Scale

Author: Timothy L Barklow

Publisher: World Scientific

Published: 1997-05-05

Total Pages: 749

ISBN-13: 9814499072

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This is an expanded version of the report by the Electroweak Symmetry Breaking and Beyond the Standard Model Working Group which was contributed to Particle Physics — Perspectives and Opportunities, a report of the Division of Particles and Fields Committee for Long Term Planning. One of the Working Group's primary goals was to study the phenomenology of electroweak symmetry breaking and attempt to quantify the “physics reach” of present and future colliders. Their investigations encompassed the Standard Model — with one doublet of Higgs scalars — and approaches to physics beyond the Standard Model. These include models of low-energy supersymmetry, dynamical electroweak symmetry breaking, and a variety of extensions of the Standard Model with new particles and interactions. The Working Group also considered signals of new physics in precision measurements arising from virtual processes and examined experimental issues associated with the study of electroweak symmetry breaking and the search for new physics at present and future hadron and lepton colliders.This volume represents an important contribution to the efforts being made to advance the frontiers of particle physics.