ew observables probe the higgs bosons indirectly by means of quantum corrections
DESCRIPTION
Electroweak Measurements. EW observables probe the Higgs bosons indirectly by means of quantum corrections . Large quantum corrections to EW observables come from the top quark. M top : Direct vs. Indirect. Indirect meas.s : fits to EW observables. Direct meas.s : CDF and D0. - PowerPoint PPT PresentationTRANSCRIPT
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EW observables probe the Higgs bosons indirectlyby means of quantum corrections.
Large quantum corrections to EW observables come fromthe top quark.
Electroweak Measurements
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Mtop : Direct vs. Indirect
Indirect meas.s :fits to EW observables
Direct meas.s :CDF and D0
Lower limits : direct searches in e+e- and pp
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MH < 165 ~ 206 GeV at 95% CLFavor light Higgs
Precision EW Measurements
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Mw(GeV)
MH(GeV)
Mtop (GeV) year
1 prediction
1991 Mtop limit
1991
2001
1995
EW Measurements (last ~10 years)
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Higgs Searches at LEP 2 (e+e- collider)
e+e- ZHcross section (fb)
e+e- cm energy (GeV)
M > 109 GeV3.0 ZH, 3.6 bgrn, 6 observed
~2 excess observed in agreement with MH ~ 115 GeV
or MH > 113 GeV at 95% CL
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& girls
TevatronLEP 2
Higgs Searches : LEP 2 Tevatron
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Run IIa
Tevatron Run IIa EW Measurements
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Tevatron & CDF/D0 Upgrade (Run II)
HW+
W-Hd-
u
W+*
W+
LEPReach
t
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Run IIa2001 ~ 2003 : 2fb-1
Run IIb2004 ~ 2007 (?)
20fb-1 (?)
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installing silicon tracker, prior to detector roll-in
CDF Detector
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electronics
1.5m
~722 k channels
silicon
CDF Silicon System
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residual dist. (cm)
Hit Resolution~200 m
Goal : 180 m
96 layers
e+
e-
CDF Drift Chamber
a collaboration of several groups includingY.K.Kim’s group (Berkeley)
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Ko p B+ J/ K+
Z e+ e- Jets
J/ +-
() GeV/c2
W e transverse mass
CDF : Preparing for First Physics …
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Ko p B+ J/ K+J/ +-
() GeV/c2
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CDF B Signals
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CDF B Signals
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CDF Z Signals
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CDF Z Signals
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CDFJets
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Physics with 200 pb-1
B physics BS mixing sin2
Top, EWK physics a larger sample
~ (Run I) x 4
Extend SUSY and new particle studies
QCD
BS DS , DS DS
SM
discovery
hint
Near-term Prospects
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the Standard Model Its foundation is symmetry. Effective Theory
Supersymmetric extensions of the Standard Model Supersymmetry relates bosons
and fermions. h, H, A, H+, H-
h SM Higgs Mh < ~130 GeV
Grand Unified Theory Unification of
coupling strengths
Physics beyond the Standard Model
Evolution of EM, Weak, Strong
SM
SUSY
~~
e+ e-
superparticle
e e~
e
Me Me
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necessary to understand EWSB
1991 2021 (year)
LEP (e+e-) 208 GeV
LHC (pp) 14 TeV
Tevatron (pp) 2 TeVRun IIRun I
Energy Frontier Acceleratorsto understand origin of Mass
2001 2011
e+e-(0.5-1 TeV) ?
e+e-, +- (2-4 TeV) ?pp (~100 TeV) ?