Combination of CDF and D0 results on theWboson mass and width

Abstract

The results based on 1992 -95 data (Run 1) from the CDF and D0 experiments on the measurements of the W boson mass and width are presented, along with the combined results. We report a Tevatron collider average M W 80:456 0:059 GeV. We also report the Tevatron collider average of the directly measured W boson width ÿ W 2:115 0:105 GeV. We describe a new joint analysis of the direct W mass and width measurements. Assuming the validity of the standard model, we combine the directly measured W boson width with the width extracted from the ratio of W and Z boson leptonic partial cross sections. This combined result for the Tevatron is ÿ W 2:135 0:050 GeV. Finally, we use the measurements of the direct total W width and the leptonic branching ratio to extract the leptonic partial width ÿW ! e 224 13 MeV.

New physics models of direct CP violation in charm decays

“…A higher mass range, 1.0 − 4.1 TeV, is probed by the CMS experiment. There are other dijet searches from the DØ [46] and ATLAS experiments [47]. The DØ collaboration analyzed 109 pb −1 of data, however, while CDF analyzed 1.13 fb −1 , indicating the DØ bound is less competitive than the one from CDF.…”

Very light axigluons and the top asymmetry

“…Quark coupled axigluons give rise to two and four jet events from single and pair production, respectively. Our mass range of interest (50 -90 GeV) is safe from Tevatron [37,38] and LHC [39,40] dijet resonance searches, which do not set bounds on masses below 180 and 200 GeV, respectively. A preliminary AT-LAS analysis of multijet events [41] sets limits on color octet scalars with narrow widths, but does not constraint masses below 100 GeV.…”

Combination of electroweak and QCD corrections to single W production at the Fermilab Tevatron and the CERN LHC

“…Albeit a long time has passed since then, the production of electroweak gauge bosons in hadronic collisions is still a topic of deep interest in modern particle physics. Actually, single W and Z boson production is used at the Fermilab Tevatron collider to derive precision measurements of the W boson mass and width [2], to extract the electroweak (EW) mixing angle from the forward-backward asymmetry in the neutral current (NC) channel [3] and to severely constrain the Parton Distribution Functions (PDF) through the measurement of the W charge asymmetry [4]. These processes are also used for detector calibration and the measurement of their total production cross section can be compared with the corresponding QCD prediction, in order to test the convergence of the strong coupling expansion in perturbative QCD calculations [5,6].…”