Thursday, December 3, 2009, 3:00 pm — Small Seminar Room, Bldg. 510
Knowledge of the W boson mass (MW) is currently the limiting factor
in our ability to tighten the constraints on the mass of the
hypothetical Higgs boson as determined from internal consistency of
the standard model.
Improving the measurement of MW is therefore an important contribution
to our understanding of the electroweak interaction, and, potentially,
of how the electroweak symmetry is broken. We present a new
measurement of MW based on 1 fb^-1 of data from Run II of the
D0 experiment at the Fermilab Tevatron collider. Our result,
MW = 80.401 +/- 0.043 GeV, is the single most precise measurement
of MW to date. We also discuss the resulting constraints on the Higgs
boson mass, as well as the prospects for even more precise results
using the ten times larger dataset expected from Run II. The standard
model could be in serious difficulties by the end of Run II.
Hosted by: Serban Protopopescu
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