theory of electroweak interactions -...
TRANSCRIPT
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Theory of Electroweak Interactions
Open KIAS PCSI, 2013
Theoretical structure Discovery of W and Z Quantum fluctuations
[Okun, Leptons and Quarks] [Perkins, Introduction to HEP]
[Peskin, Perimeter, 2009] [Altarelli, arXiv:1303.2842]
[Quigg, ICTP-SAIFR School, 2013] [EW review, PDG 2012]
[Higgs review, PDG 2012] …
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[Perkins, Intro. to HEP]
Milestones in Particle Physics
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X ⇔ Y
1973
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FB Asymmetry Two-fold ambiguity disappeared!
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CC NC
[Weinberg’s nose]
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Discovery of Z and W
Z boson
1983
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W boson
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Production of Z at LEP I & SLC and W pair at LEP II
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+
Precision tests of the Z sector
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Z-boson pole
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Z lineshape
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Identical resonance, independent of final states ⇒ same propagator
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Principal Z pole observables
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Number of light neutrino families
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Precision tests of the W sector
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W branching ratios
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W mass measurements
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Triple gauge couplings
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EW unification seen at HERA
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Top quest
Raison d'être
Two families cannot account for CP violation in the quark sector
Given the existence of b and τ, the top quark is requested for
anomaly cancellation
Absence of FCNC in (tree-level) b decays
b quark has a weak isospin of -1/2, demanding a partner
[Schaile and Zerwas, 1992]
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Higher-order corrections ⇔ Top (and H) mass
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Global fits to precision EW measurements
Precision and calculations improve with time!
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Observation of the top quark at Tevatron (1995)
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Successful SU(2) x U(1) EW structure
NC Charm W & Z
Precision EW tests (0.1%)
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H influence
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Higgs Odyssey
A Higgs boson SM Higgs or not?
Implications Prospects
Discovery of a new boson on July 4, 2012
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Characteristic 2 γ and 4μevents
[CMS]
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[ATLAS]
Accumulated 2-photon and 4-lepton events
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mH = 125.4 0.5 (stat.) 0.6 (syst.)
With additional data, new analysis, significance decreased relative to July/4!!
CMS HIG-13-001
7.4σ
ATLAS-CONF-2013-021
7.4σ (obs) ⇔ 4.1σ (exp) m
H = 126.8 ± 0.2(stat) ± 0.7(syst) GeV
Moriond 2013 [Incandela @ Princeton] H
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H Z*Z 4 l
6.7 s (obs) ⇔ 7.1 s (exp) = s/sSM = 0.92 ± 0.28
CMS HIG-13-002
6.6σ (obs) ⇔ 4.4σ (exp) m
H = 124.3 ± 0.6
0.5 ± 0.5
0.3 GeV
µ = 1.7 ± 0.50.4
ATLAS-CONF-2013-013
Moriond 2013
[Incandela @ Princeton]
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H tt
m = 120+9-7 (stat+syst) GeV CMS HIG-13-004
~3 s
First strong indication of decay to spin ½ particles
μτh, eτh, eμ, τhτh, μμ
Moriond 2013
[Incandela @ Princeton]
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SM Higgs Couplings
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Basic Diagrams for the SM Higgs Boson
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Production Decay SM Higgs
Clean signature
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Signal strength and mass (combining and ZZ*)
=0.80±0.14 =1.30±0.20
m = 125.7 ± 0.3 ± 0.3 GeV m = 125.5 ± 0.2 +0.5-0.6 GeV
CERN 4/15, 2013
[Incandela @ Princeton]
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The SM Higgs Boson ?
A Higgs Boson !
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RGE running of the quartic Higgs coupling
QFT vacuum is a dielectric medium that screens charge ⇒ the effective charge is a function of the distance or the energy.
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Triviality : MH from above
If the SM is valid to infinite energy, thenλ(v2) =0, i.e. non-interacting.
Since the Higgs mass is non-zero, then the theory has a cutoff ΛC
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Stability : MH from below
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Message
For any Higgs mass, there is a maximum energy scale beyond
which the theory ceases to make sense.
The description of the
Higgs boson as an elementary scalar is at
best an effective theory, valid over a finite range of energies.
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Extremely sensitive to the top quark mass
Meta-stable vacuum
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New Endless Issues?!
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[Haber]