Searches for new physics in the top quark samples at the CDF experiment Page: 3 of 8
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m, [GeV]
Figure 1: SM and MSSM Higgs bo-
son mass constraints in the mt-Mw
plane._ experimental errors LEP2/Tevatron (today) _
- 68 CL
- 95% CL
bo h moI'SM_
both models[' '-2 Top Quark Properties
2.1 Top Quark Mass
The measurement of the top quark mass is a main goal for the Tevatron Run II.
It requires to face several challenges such as a full final state reconstruction
and a precise measurement of the energies of the jets and of the undetected
neutrinos. A big effort has been put by the CDF collaboration to address these
issues in the last years, finally leading to the best world measurement of the
top mass, mt = 172.7 2.1 GeV/c2 6). Even without including this result,
the most recent Tevatron combination reaches a precision of about 1% on the
top mass, mt = 170.9 1.8 GeV/c2 7). Such a precise measurement of the
top mass allows to constrain the mass of the Higgs boson through the radiative
corrections to the mass of the W boson. Results are shown in fig.1 both for
Standard Model and Minimal Supersymmetric Standard Model. Finally, the
fit to electroweak parameter measurements tells us that the mass of the SM
Higgs boson is lower than 144 GeV/c2 at 95% CL.
2.2 Top Quark Charge
Fits to electroweak precision measurements seem to prefer a higher value for
the top mass than measured. It has been suggested that the particle observedCFR- I Prelim[nar L4 0 b-1
3.5 Exected Lmi at 5% C L.
SoExpected L mt 95/O C.L
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S. pco o LptophobcZ
SMZ k-13
2.5
o 2
J 1.5
0.5
0.
500 600 700 800 900
Mass of ti Resonance (Gevlc2)
Figure 2: Upper limits on the production
cross section for Z' -+ tt as a function of
the Z' mass.80 501
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Scodellaro, Luca. Searches for new physics in the top quark samples at the CDF experiment, article, October 1, 2007; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc893511/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.