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Let me turn now
to what top can tell us about Higgs.
I’m somewhat reluctant to show this because we have one of the world
experts on this subject in the room.
Earlier I showed how loop corrections could tell us indirectly where
the top lay. In a similar way loop
corrections on top can tell us where the Higgs is. The W and mass can be calculated from other
basic quantities, mz, gf (strength of the weak interaction) and alpha
(strength of the em). Loop diagrams
show dependce on top. This plot, which
Martin showed at the big physics meeting this year, has the top q on this
axis and w on this. The RED curve
shows the 68%cl for where W and top should be from LEP. The GREEN curve is the direct measurement
of both from Lep2 and Tevatron. The
AGREEMENT shows the excellence of the Smodel once again. But also, in orange is the effect of the
Higgs. Note this deltaR is also a weak
function of the Higgs mass and from this we can say that the Higgs is more
likely light than heavy.
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