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Transcript of Lecture Standard Model
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 1
Christian SchwanenbergerChristian SchwanenbergerTel.: +44 161 306-6466Tel.: +44 161 306-6466 +1 630 840-4242+1 630 840-4242
Fax: Fax: +1 630 840-6650 +1 630 840-6650 [email protected]@fnal.gov
http://www-d0.fnal.gov/~schwanenhttp://www-d0.fnal.gov/~schwanen
22ndnd term 2010 term 2010
The Standard Model The Standard Model of Particle Physicsof Particle Physics
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 2
ContentContent
1.1. Introduction Introduction
2.2. Basics of Quantum Field Theory Basics of Quantum Field Theory
3.3. Quantum Electrodynamics, QED Quantum Electrodynamics, QED 3.13.1 Classical Field Theory Classical Field Theory 3.23.2 The Lagrange density of QED The Lagrange density of QED 3.33.3 The Feynman rules of QED The Feynman rules of QED 3.43.4 Renormalisation in QED Renormalisation in QED
4.4. Quantum Chromodynamics, QCD Quantum Chromodynamics, QCD 4.14.1 The Lagrange density of QCD The Lagrange density of QCD 4.24.2 The Feynman rules of QCD The Feynman rules of QCD 4.34.3 Asymptotic freedom Asymptotic freedom 4.44.4 Confnement Confnement 4.54.5 Quarkonium physics Quarkonium physics
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 3
ContentContent
5.5. Quantum Flavour Dynamics (QFD) Quantum Flavour Dynamics (QFD) 5.15.1 The Gauge Group of QFD The Gauge Group of QFD 5.2 5.2 The Higgs feld and spontaneous symmetry The Higgs feld and spontaneous symmetry breaking breaking
5.35.3 Extension of QFD to more fermions and Extension of QFD to more fermions and efective low energy coupling efective low energy coupling 5.45.4 The mass matrix and the CKM matrix The mass matrix and the CKM matrix 5.55.5 The Feynman rules of QFD The Feynman rules of QFD
6.6. Higgs Physics Higgs Physics 6.16.1 Higgs properties Higgs properties 6.26.2 Decay modes Decay modes 6.36.3 Production mechanism at Tevatron/LHC Production mechanism at Tevatron/LHC
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 4
ContentContent
Exercises:Exercises:33 problem sheets problem sheets33 tutorials if you like... tutorials if you like...
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 5
LiteratureLiterature
Introduction to Quantum Field Theory, Introduction to Quantum Field Theory, J. Forshaw webpageJ. Forshaw webpage An Introduction to Quantum Field Theory,An Introduction to Quantum Field Theory, Peskin and SchroederPeskin and Schroeder Quarks and Leptons,Quarks and Leptons, Halzen & MartinHalzen & Martin Introduction to Gauge Field Theory,Introduction to Gauge Field Theory, Bailin & LoveBailin & Love Gauge Theory of Elementary Particle Physics,Gauge Theory of Elementary Particle Physics, Cheng & LiCheng & Li Quantum Field Theory,Quantum Field Theory, RyderRyder Gauge Theories in Particle Physics,Gauge Theories in Particle Physics, Aitchison & Hey (Vols. 1 & 2)Aitchison & Hey (Vols. 1 & 2) Elementary Particle Physics: Concepts and PhenomenaElementary Particle Physics: Concepts and Phenomena Nachtmann Nachtmann
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 6
1.1. Introduction Introduction
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 7
The Standard ModelThe Standard Model
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 8
gluon discovery at gluon discovery at ee++ee- - accelerator PETRAaccelerator PETRA(DESY, Hamburg)(DESY, Hamburg)
√√s=35s=35 GeV GeV
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 9
discovery of Z boson at ppdiscovery of Z boson at pp accelerator SPSaccelerator SPS(CERN, Geneva)(CERN, Geneva)
1983, UA1 experiment, 1983, UA1 experiment, √√s=s=540 GeV540 GeV
Z bosonZ boson__
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 10
Cross section Cross section σ(σ(ee++ee- - → Z → Z 00 → → f) f)
as function of as function of center of mass center of mass energy by OPAL energy by OPAL
(LEP)(LEP)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 11
Z mass distribution with calculations for 2, 3 and 4 Z mass distribution with calculations for 2, 3 and 4 neutrino types by all 4 experiments at LEPneutrino types by all 4 experiments at LEP
LEP experiments, LEP experiments, CERNCERN
Z Z →→ hadronshadrons
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 12
Measurement of WMeasurement of W+ + WW- - at the threshold in eat the threshold in e+ + ee- -
interactions at LEP IIinteractions at LEP II
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 13
Reconstructed W mass in 4 jet events by Reconstructed W mass in 4 jet events by ALEPH at LEP IIALEPH at LEP II
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 14
mW = 80.401 ± 0.043 (stat) GeV
W mass measurements W mass measurements at the Tevatronat the Tevatron
±0.05%±0.05%
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 15
Summary: W mass measurementsSummary: W mass measurements
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 16
Particle accelerators used for precision Particle accelerators used for precision measurements for W and Z bosons measurements for W and Z bosons
/1960
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 17
HERA: ep Collider and ExperimentsHERA: ep Collider and Experiments
√√s = 320 GeVs = 320 GeV QQ2 2 ≈≈100000 GeV100000 GeV22
λλCC ≈≈1010-3-3 fm fm
√√s = 320 GeVs = 320 GeV QQ2 2 ≈≈100000 GeV100000 GeV22
λλCC ≈≈1010-3-3 fm fm
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 17
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 18
DIS – Neutral Current (NC)DIS – Neutral Current (NC)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 18
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 19
DIS - Charged Current (CC)DIS - Charged Current (CC)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 19
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 20
QCD fts to FQCD fts to F2 2 data using DGLAP equationsdata using DGLAP equations
sea sea quarks:quarks:
half of proton half of proton
momentummomentum
valence valence
quarks:quarks:
lead to lead to scaling scaling
violation, violation, FF
22(Q(Q22))≠const.≠const.
many many
gluonsgluons with small with small momentum momentum
fractionfraction
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 21
____The Tevatron at FERMILAB: pp CollisionsThe Tevatron at FERMILAB: pp Collisions
Mai n I n jec tor & Recyc l er
Tevatron
Booster
p p
p source
Ch i cago
_
_
CDF DØ
60 km60 km
p
√s =1.96 TeV ∆t = 396 ns
Run I 1987 (92)-95Run I 1987 (92)-95Run II 2001-09: 40x larger dataset Run II 2001-09: 40x larger dataset at increased energyat increased energy
p _
top quark discoverytop quark discoverymeasure properties with high precisions:measure properties with high precisions:is it really the particle expected in SM?is it really the particle expected in SM?
__
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 22
discovery of top quark at ppdiscovery of top quark at pp accelerator accelerator Tevatron (Fermilab, Batavia)Tevatron (Fermilab, Batavia)
__top quarktop quark
1995, CDF and D1995, CDF and DØØ experiments experiments, , √√s=1.8s=1.8 TeV TeV
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 23
Top Quark Pair ProductionTop Quark Pair Production
tt gg
qq--
85%85%
qq tt
tt--
tt-- tt-- tt--
gg gg
gg gg gg
tt tt
15%15%
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 24
Top Antitop SignaturesTop Antitop Signatures
all jetall jet40%40%
dilepton (e/dilepton (e/μ)μ) 5%5%
top decay:top decay: ~100% ~100%
reconstruct and identify:reconstruct and identify: electrons, muons, jets, electrons, muons, jets, b-jets and missing b-jets and missing transverse energy transverse energy
tt
bb
ℓℓ++ q'q'--
qq ν,ν,
,, WW++
dileptondilepton lepton + jetslepton + jets
lep
ton +
jets
lep
ton +
jets
l+jetsl+jets 35%35%
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 25
Single Top Quark ProductionSingle Top Quark Production
s-channel:s-channel:
t-channel:t-channel:
missing Emissing ETT
isolated leptonisolated lepton
jetsjets
b-jetsb-jets
tt
VVtbtb
VVtbtb
frst direct measurement of |Vfrst direct measurement of |Vtbtb||
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 26
Single Top Quark ObservationSingle Top Quark Observation
tt
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 27
Single Top Quark ObservationSingle Top Quark Observation
|Vtb| = 1.07 ± 0.12 |V
tb| = 0.91 ± 0.11
5.05.0σσ
5.05.0σσ
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 28
Single Top Quark ObservationSingle Top Quark Observation
1 year ago
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 29
The Top Quark MassThe Top Quark Mass
free parameter in the Standard Modelfree parameter in the Standard Model
check the self-consistency of the Standard Model check the self-consistency of the Standard Model in combination with W mass measurementin combination with W mass measurement
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 30
Tevatron Combination: Spring 2009Tevatron Combination: Spring 2009
mtop
= 173.1 ± 0.6 (stat) ± 1.1 (syst) GeV
world average:world average:
±0.75%±0.75%
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 31
Top, W and Higgs Mass in the SMTop, W and Higgs Mass in the SM
mtop
= 173.1 ± 1.3 GeV
world average world average (March 2009)(March 2009)
Heinemeyer, Hollik, Heinemeyer, Hollik, Stockinger, Weber, Weiglein 2009Stockinger, Weber, Weiglein 2009
world average world average (March 2009)(March 2009)
mW = 80399 ± 23 MeV
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 32
Search for the Higgs bosonSearch for the Higgs boson
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 33
B factories Belle and BabarB factories Belle and Babar
ee++ee- - colliders PEP (SLAC) and KEKcolliders PEP (SLAC) and KEK
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 34
The Large Hadron Collider (LHC)The Large Hadron Collider (LHC)
ATLASATLAS
CMSCMS
The Large Hadron Collider:The Large Hadron Collider: proton-proton collider proton-proton collider ⇨ ⇨ 2 separate beampipes2 separate beampipes 10 fb10 fb-1-1 per year per year high energy: high energy: √√s = 14 TeVs = 14 TeV 40 Mio. collisions per second40 Mio. collisions per second frst collisions in 2009frst collisions in 2009 4 experiments: 4 experiments: ATLASATLAS, CMS, ALICE, , CMS, ALICE, LHC-BLHC-B
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 35
2.2. Quantum Quantum Electrodynamics, QEDElectrodynamics, QED
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 36
2.32.3: The Feynman rules of QED: The Feynman rules of QED
2.2. Quantum Quantum Electrodynamics, QEDElectrodynamics, QED
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 37
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 38
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 39
2 nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 40
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 41
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 42
From O.Nachtmann,
From O.Nachtmann,
Elementary Particle Physics,
Elementary Particle Physics,
Springer, 1990
Springer, 1990
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 43
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 44
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 45
3.43.4: Renormalisation in QED: Renormalisation in QED
3.3. Quantum Quantum Electrodynamics, QEDElectrodynamics, QED
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 46
αα-1-1
QED QED as function of as function of √s√s in in ee++ee- - annihilationannihilation
αα-1-1
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 47
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 48
4.4. Quantum QuantumChromodynamics, QCDChromodynamics, QCD
4.1 4.1 The Lagrange Density of QCDThe Lagrange Density of QCD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 49
Quark Flavours and ColourQuark Flavours and Colour
R= ee− hadrons ee−−
=3∑ quarkcharge2
12
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 50
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 51
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 52
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 53
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 54
4.3 4.3 The Feynman Rules of QCDThe Feynman Rules of QCD
4.4. Quantum QuantumChromodynamics, QCDChromodynamics, QCD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 55
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 56
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 57
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 58
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 59
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 60
2 jet event at 2 jet event at ee++ee- - accelerator PETRAaccelerator PETRA
antiquarkantiquark
quarkquark
hadronshadrons
hadronshadrons
electronelectron positronpositron
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 61
3 jet event and angular distribution 3 jet event and angular distribution at at ee++ee- - accelerator PETRAaccelerator PETRA
spin 0 spin 0 gluongluon
spin 1 spin 1 gluongluon
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 62
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 63
4.4 4.4 Asymptotic FreedomAsymptotic Freedom
4.4. Quantum QuantumChromodynamics, QCDChromodynamics, QCD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 64
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 65
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 66
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 67
ααss
QQ22
strong coupling strong coupling ααss(Q(Q22))
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 68
Noble Prize 2004 for running of strong coupling Noble Prize 2004 for running of strong coupling ααss
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 69
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 70
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 71
World average World average (March 2009)(March 2009)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 72
4.5 4.5 ConfnementConfnement
4.4. Quantum QuantumChromodynamics, QCDChromodynamics, QCD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 73
Potential of strong quark interaction Potential of strong quark interaction from charmonium and bottomium datafrom charmonium and bottomium data
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 74
Schematic HadronisationSchematic Hadronisation
quarkquark
antiquarkantiquark
pionspions
pionspions
quarkquark antiquarkantiquark
quark-antiquarkquark-antiquarkpairspairs
hadronshadrons
colour feld colour feld
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 75
2 jet event at 2 jet event at ee++ee- - accelerator PETRAaccelerator PETRA
antiquarkantiquark
quarkquark
hadronshadrons
hadronshadrons
electronelectron positronpositron
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 76
4.6 4.6 Quarkonium PhysicsQuarkonium Physics
4.4. Quantum QuantumChromodynamics, QCDChromodynamics, QCD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 77
Discovery of Discovery of J/ψ:J/ψ: pp- (Brookhaven) and epp- (Brookhaven) and e++e-scattering (SLAC)e-scattering (SLAC)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 78
ψ'(3.7) ψ'(3.7) →→ ψ(3.1) π ψ(3.1) π++ππ- - →→ e e++ee-- π π++ππ--
in a spark chamber detector in a spark chamber detector
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 79
22 33SS 1 1 ((ψ'ψ'))
cccc__
energy levels for charmonium and positroniumenergy levels for charmonium and positronium
1133SS1 1
(J/ψ)(J/ψ)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 80
2233SS1 1 (ψ')(ψ')
cccc__
energy niveaux for charmonium and positroniumenergy niveaux for charmonium and positronium
1133SS1 1
(J/ψ)(J/ψ)
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 81
4.4. Quantum Flavour Quantum FlavourDynamics, QFDDynamics, QFD
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 82
(?)(?)Higgs-boson:Higgs-boson:explains massesexplains massesHH
±±
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 83
Spontaneous Symmetry Breaking (SSB)Spontaneous Symmetry Breaking (SSB)
Higgs potential:Higgs potential:
Higgs ground state:Higgs ground state:
unmagnetised material:unmagnetised material:
ferromagnetic material:ferromagnetic material:SSBSSB
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 84
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 85
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 86
From O.Nachtmann,From O.Nachtmann,Elementary Particle Elementary Particle Physics,Physics,Springer, 1990Springer, 1990
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 87
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 88
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 89
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 90
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 91
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 92
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 93
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 94 2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 94
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 95
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 96
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 97
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 98
Single Top Quark ProductionSingle Top Quark Production
s-channel:s-channel:
t-channel:t-channel:
missing Emissing ETT
isolated leptonisolated lepton
jetsjets
b-jetsb-jets
tt
VVtbtb
VVtbtb
frst direct measurement of |Vfrst direct measurement of |Vtbtb||
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 99
Single Top Quark ObservationSingle Top Quark Observation
5.05.0σσ
5.05.0σσ
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 100
First direct measurement of |VFirst direct measurement of |Vtbtb||
VVtbtb
assume: |assume: |VVtdtd||22 + | + |VV
tsts||22 « « ||VV
tbtb||22
assume: pure V-A and CP-conserving Wtb interactionassume: pure V-A and CP-conserving Wtb interaction
no assumption on quark families or CKM matrix unitarityno assumption on quark families or CKM matrix unitarity
before indirect limits: |Vbefore indirect limits: |Vtbtb| = 0.999127 | = 0.999127 ±± 0.00026 (10.00026 (1σ CLσ CL))
CKM Fitter Group for Beauty 2006CKM Fitter Group for Beauty 2006
|Vtb| = 0.88 ± 0.07 ++
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 101
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 102
From O.Nachtmann,From O.Nachtmann,Elementary Particle Elementary Particle Physics,Physics,Springer, 1990Springer, 1990
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 103
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 104
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2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 106
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 107
5.5. Higgs Physics Higgs Physics
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 108
Fits to Electroweak Precision DataFits to Electroweak Precision Data
H H
H
LEP, SLD, TevatronLEP, SLD, Tevatron
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 109
Bounds on SM Higgs MassBounds on SM Higgs Mass
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 110
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 111
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Branching Fractions of SM Higgs ParticleBranching Fractions of SM Higgs Particle
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 115
Total Decay Width of SM Higgs ParticleTotal Decay Width of SM Higgs Particle
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 116
cross
sec
tion (
pb
)cr
oss
sec
tion (
pb
)SM Higgs Production at the TevatronSM Higgs Production at the Tevatron
2nd Term 2010 The Standard Model of Particle Physics – Christian Schwanenberger – University of Manchester 117
Search for the Higgs bosonSearch for the Higgs boson