W pair production cross-section and W branching fractions in e+e- interactions at 189 GeV
High Energy Physics - Experiment
2010-04-08 v1
Abstract
The cross-section for the process e+e- -> W+W- has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 189 GeV and corresponding to an integrated luminosity of 155 pb^{-1}. Based on the 2392 events selected as WW candidates, the cross-section for the doubly resonant process e+e- -> W+W- has been measured to be 15.83 +- 0.38 (stat) +- 0.20 (syst) pb. The branching fractions of the W decay were also measured and found to be in good agreement with the Standard Model expectation. From these a value of the CKM mixing matrix element |V_{cs}| = 1.001 +- 0.040 (stat) +- 0.020 (syst) was derived.
Cite
@article{arxiv.hep-ex/0103013,
title = {W pair production cross-section and W branching fractions in e+e- interactions at 189 GeV},
author = {The DELPHI Collaboration and P. Abreu},
journal= {arXiv preprint arXiv:hep-ex/0103013},
year = {2010}
}
Comments
16 pages, 4 figures