Lecture 11
Physics Program
of the experiments at
L H
arge
adron
C
ollider
SM Higgs boson:
properties
Supersymmetry
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Recorded luminosity in 2012
Measured with forward detectors, calibrated with beam separation scans
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SM Higgs production at the LHC
125 GeV
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December 13-th update (CERN)
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Higgs boson decay
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H->update
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H->update: single channel discovery!
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H->update: mass measurement
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H->update: signal strength
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December 13-th update (CERN)
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H->4l update: signal confirmation
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H->4l update: signal strength
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H-> and H->4l combination
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All channels combination
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First analysis of spin in H-> channel
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Analysis of spin in H->l channel
+
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Analysis of parity in H->l channel
-
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Couplings ( presented at HCP )
~
~
~
~
~
~
~
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Couplings
Γγγ /ΓγγSM = (1.6 κ2W +
0.07 κt2 – 0.67 κWκt)
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Global k fit
Several Fits performed with 2011(~4.8 fb-1) +2012(~5.9
fb-1) results.
Fit global scale factor κ:
Based on July results
As expected just ~square root of µ = 1.4 ± 0.3
Theory error not dominant yet … but already sizable
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kF vs kV fit
• Couplings to Fermion and Vector boson sectors:
κF vs κV
Assumption only SM particles in ΓH ~ κH2(κF, κV)
• All Fermion couplings scale with the same factor κF
• All Boson couplings scale with the same factor κV
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kF vs kV fit
Based on July results
• Good compatibility with SM
• κF = 0 (Fermiophobic Higgs) Excluded at >2σ
• Thanks to channels that distinguish ggH from VBF production
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Custodial Symmetry
λ WZ = kW/kZ
Testing Custodial Symmetry W vs Z couplings
Move to fit of RATIO’s (can relax assumption on total width)
• λ WZ = κ W/κ Z
Two additional parameters λFZ κZZ in the fit but with small correlation
with λWZ dominated by relative WW and ZZ yields and by BRγγ that scales
mainly as κW2
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Custodial Symmetry
λ WZ = kW/kZ
Testing Custodial Symmetry W vs Z couplings
Move to fit of RATIO’s (can relax assumption on total width)
• λ WZ = κ W/κ Z
Two additional parameters λFZ κZZ in the fit but with small correlation
with λWZ dominated by relative WW and ZZ yields and by BRγγ that scales
mainly as κW2
Based on July results
*In this plot λFZ >0
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Loop contributions kg vs k
Assumptions:
• Direct Coupling to known SM particles assumed to be as in
SM:
• κb =κW =κZ =κτ = …. = 1
• κH ~ 0.9 + 0.1 κg
• No extra contributions to total width (only known SM and gg)
• Fitted parameters κg vs κγ
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Loop contributions kg vs k
• Couplings to gg and γγ expected to proceed via loop: very
sensitive to BSM physics
• Hierarchy problem related to top loop that are the same that
contributes to gg Higgs coupling
• Treat gg and γγ loops as free parameters (no relationship with
SM content assumed)
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Loop contributions kg vs k
Still dominated by statistical uncertainty
Without theorerical error ~20% smaller error
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SUSY
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SUSY
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Minimal SUGRA
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Inclusive searches
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Inclusive searches
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Inclusive searches
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SUSY
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Analysis setup
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O lepton+ jets + ETmiss
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1 lepton+ jets + ETmiss
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SUSY
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Supersymmetry: search results
1 TeV
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MET + jets + Tau
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Natural SUSY
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SUSY
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RPV supersymmetry
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Long life-time particle
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RPV SUSY in events with ≥ 4 leptons
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RPV SUSY in events with ≥ 4 leptons
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Different flavour leptons resonances
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Events with displaced vertices
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Events with displaced vertices
12
10
8
Column 1
Column 2
Column 3
6
4
2
0
Row 1
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Row 4
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Disapering tracks
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Disapering tracks
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Stable massive particles
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Stable massive particles
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Supersymmetry: search results
1 TeV
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Rare decays
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Constraints in CMSSM model
At lower tan the relative importance
of direct searches increases.
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Parton luminosity
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Parton luminosity
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Next topics
9.1
 16.1
 23.1

– other searches for New Physics
- B-physics programme
– heavy ion programme
Living in incredibly
exciting time for
fundamental partcile
physics!
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