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Extraction of the Width of the W Boson from a Measurement of the Ratio of the W and Z Cross Sections

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Page : 5 pages

File Size : 35,99 MB

Release : 2000

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This dissertation reports on measurements of inclusive cross sections times branching fractions into electrons for W and Z bosons produced in p{anti p} collisions at √s = 1.8 TeV. From an integrated luminosity of 84.5 pb−1 recorded in 1994--1995 by the D0 detector at the Fermilab Tevatron [Lambda] the cross sections are measured to be [sigma]p{anti p} → W + X · B(W → e[nu]) = 2,310 ± 10 (stat) ± 50 (Syst) ± 100 (lum) pb and [sigma](p{anti p} → Z + X) · B(Z → ee) = 221 ± 3 (stat) ± 4 (Syst) ± 10 (lum) pb. The cross section ratio R is determined to be [sigma](p{anti p} → W + X) · B(W → e[nu])/[sigma](p{bar p} → Z + X) · B(Z → ee) = 10.43 ± 0.15 (stat) ± 0.20 (syst) ± 0.10 (NLO)[Lambda] and R is used to determine B(W → e[nu]) = 0.1044 ± 0.0015 (stat) ± 0.0020 (syst) ± 0.0017 (theory) ± 0.0010 (NLO)[Lambda] and [Lambda]{sub W} = 2.169 ± 0.031 (stat) ± 0.042 (syst) ± 0.041 (theory) ± 0.022 (NLO) GeV. The latter is used to set a 95% confidence level upper limit on the partial decay width of the W boson into non-standard model final states [Lambda][Lambda]{sub W}{sup inv}[Lambda] of 0.213 GeV.





Measurement of W and Z Boson Production and Extraction of the W Width and Branching Ratios at CDF

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Page : 6 pages

File Size : 10,74 MB

Release : 1994

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We present results from W and Z boson production in proton-antiproton collisions at √s = 1.8 TeV using the CDF detector. We measure the W and Z cross sections times lepton branching ratio, [sigma](p{bar p} → W)·B(W → l[nu]{sub l}) and [sigma](p {bar p} → Z)· B(Z → k+l−) l = e, [mu]. We also measure the ratio: R{sub l} = [sigma] · B(W → l[nu]{sub l})/[sigma] · B(Z → ll). From R{sub l}, we extract the W electron and muon branching ratios, BR(W → l[nu]{sub l}, and the total W width, [Gamma]{sub W}. In addition, high transverse mass W →e[nu]{sub e}, candidates provide an alternate, direct measurement of [Gamma]{sub W}.







Physics In Collision - Proceedings Of The 15th International Conference

Author : Krzysztof Rybicki

Publisher : World Scientific

Page : 539 pages

File Size : 39,60 MB

Release : 1996-01-23

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ISBN : 9814548057

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This book presents a comprehensive overview of high energy physics. It covers the whole range of results from the colliders and fixed-target experiments as well as the astrophysics topics related to particle physics. Also discussed are the problems of proton structure, electroweak physics, non-perturbative QCD and heavy quarks.



High Energy Physics 99 Proceedings of the International Europhysics Conference on High Energy Physics, Tampere, Finland, 15-21 July 1999

Author : K Huitu

Publisher : CRC Press

Page : 1112 pages

File Size : 40,69 MB

Release : 2000-01-01

Category : Science

ISBN : 9780750306614

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Book Description

High Energy Physics 99 contains the 18 invited plenary presentations and 250 contributions to parallel sessions presented at the International Europhysics Conference on High Energy Physics. The book provides a comprehensive survey of the latest developments in high energy physics. Topics discussed include hard high energy, structure functions, soft interactions, heavy flavor, the standard model, hadron spectroscopy, neutrino masses, particle astrophysics, field theory, and detector development.



Measurement of the W and Z Boson Production Cross Sections in P[anti P] Collisions At[radical]

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File Size : 32,40 MB

Release : 2001

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This thesis reports on the measurement of the W and Z boson inclusive production cross sections ([sigma][sub W] and[sigma][sub Z]) times electronic branching ratios (Br(W[r-arrow] e[nu]) and Br(Z[r-arrow] ee)) in p[anti p] collisions at[radical]s= 1.8 TeV. The analysis is based on 12.8 pb[sup[minus]1] of data taken in the 1992--1993 run by the D0 detector at the Fermilab Tevatron collider; the cross sections were measured to be:[sigma][sub W][center-dot] Br(W[r-arrow] e[nu])= 2.36[+-] 0.02[+-] 0.07[+-] 0.13 nb and[sigma][sub Z][center-dot] Br(Z[r-arrow] ee)= 0.218[+-] 0.008[+-] 0.008[+-] 0.012 nb. The first error is statistical, the second error represents the non-luminosity systematic error, and the third error shows the uncertainty in the luminosity determination. Future prospects for similar measurements based on larger samples of data are discussed.





A Measurement of the Ratio of the Production Cross Sections for W and Z Bosons in Association with Jets with the ATLAS Detector

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Page : pages

File Size : 29,64 MB

Release : 2014

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In this study, the ratio of the production cross sections for W and Z bosons in association with jets has been measured in proton-proton collisions at √s = 7 TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6 fb-1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum pT > 30 GeV and jet rapidity.