Extraction of the Width of the W Boson from a Measurement of the Ratio of the W and Z Cross Sections
Author | : |
Publisher | : |
Total Pages | : 5 |
Release | : 2000 |
ISBN-10 | : OCLC:871254214 |
ISBN-13 | : |
Rating | : 4/5 ( Downloads) |
Download or read book Extraction of the Width of the W Boson from a Measurement of the Ratio of the W and Z Cross Sections written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.