Precision Electroweak Measurements and Constraints on the Standard Model

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Report number	arXiv:1012.2367 ; CERN-PH-EP-2010-095 ; FERMILAB-TM-2480-PPD ; LEPEWWG-2010-01 ; TEVEWWG-2010-01 ; ALEPH-2010-001-PHYSICS-2010-001 ; CDF-Note-10338 ; DELPHI-DELPHI-2010-001-PHYS 952 ; L3-Note-2837 ; OPAL-PR-432 ; SLAC-PUB-14301
Title	Precision Electroweak Measurements and Constraints on the Standard Model
Author(s)	, ; Grunewald, M W (ed.)
Publication	2010
Collaboration	ALEPH Collaboration ; CDF Collaboration ; D0 Collaboration ; DELPHI Collaboration ; L3 Collaboration ; OPAL Collaboration ; SLD Collaboration ; LEP Electroweak Working Group ; Tevatron Electroweak Working Group ; SLD electroweak and heavy flavour groups
Imprint	13 Dec 2010
Number of pages	18
Series	(ALEPH Papers)
Note	Comments: 18 pages, Prepared from Contributions to the 2010 Summer Conferences. Comments: 18 pages
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEP ; ALEPH CERN LEP ; DELPHI CERN LEP ; L3 CERN LEP ; OPAL Fermilab Tevatron ; CDF SLAC-SLC ; SLD
Abstract	This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. The results are compared with precise electroweak measurements from other experiments, notably CDF and DØ at the Tevatron. Constraints on the input parameters of the Standard Model are derived from the combined set of results obtained in high-$Q^2$ interactions, and used to predict results in low-$Q^2$ experiments, such as atomic parity violation, Møller scattering, and neutrino-nucleon scattering. The main changes with respect to the experimental results presented in 2009 are new combinations of results on the width of the W boson and the mass of the top quark.
Other source	Inspire
Copyright/License	arXiv nonexclusive-distrib. 1.0 Preprint: © 2010-2024 CERN (License: CC-BY-3.0)
Submitted by	[email protected]

$$\LEPI$+SLD measurements~\cite{bib-Z-pole} of $\swsqeffl$ and $\Gll$ and the SM prediction. The point with the arrow labelled $\Delta\alpha$ shows the prediction when only the photon vacuum polarisation is included in the electroweak radiative corrections. The associated arrow shows the variation in this prediction if $\alpha(\MZ^2)$ is changed by one standard deviation. This variation gives an additional uncertainty to the SM prediction shown in the figure.$ $The comparison of the indirect constraints on $\MW$ and $\Mt$ based on $\LEPI$/SLD data (dashed contour) and the direct measurements from the $\LEPII$/Tevatron experiments (solid contour). In both cases the 68\% CL contours are plotted. Also shown is the SM relationship for the masses as a function of the Higgs mass in the region favoured by theory ($<1000~\GeV$) and not excluded by direct searches ($114~\GeV$ to $158~\GeV$ and $>175~\GeV$). The arrow labelled $\Delta\alpha$ shows the variation of this relation if $\alpha(\MZ^2)$ is varied between $-1$ and $+1$ standard deviation. This variation gives an additional uncertainty to the SM band shown in the figure.$ $The 68\% confidence level contour in $\MW$ and $\MH$ for the fit to all high-$Q^2$ data except the direct measurement of $\MW$, indicated by the shaded horizontal band of $\pm1$ sigma width. The vertical bands shows the 95\% CL exclusion limit on $\MH$ from the direct searches at LEP-II (up to $114~\GeV$) and the Tevatron ($158~\GeV$ to $175~\GeV$).$ Show more plots

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Záznam vytvorený 2010-12-13, zmenený 2021-05-03

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