1. Journées de Prospective
Beyond the Standard Model
Journées de Prospective
Giens
April 2, 2012
Dirk Zerwas
LAL Orsay
Beyond the Standard Model Higgs
Supersymmetry
Alternatives to supersymmetry
Conclusions
on behalf of the BSM group (Groupe-2)

2. Beyond the Standard Model Higgs
Higgs portal:
add a hidden sector
If the Higgs is at 125GeV:
2-parameter model: ΔH = cos2χ , Γhid
LHC: BR=0.60 excl. 2012
ILC: BR=0.02 (±0.005)
ΔH:
5fb-1
20fb-1
14TeV 3000fb-1
ILC
15%
10% 5%
<1%
If no Higgs is observed with the LHC 14TeV 30fb-1
non-observation of Higgs boson does not exclude its existence

3. Supersymmetry fermion boson
has “no” problems with radiative corrections (quadrat. div.)
has a light Higgs Boson (<140GeV)
interesting pheno at the TeV scale
3 (or more) neutral Higgs bosons: h, A, H
1 (or more) charged Higgs boson(s): H±
and supersymmetric particles
Many different models:
MSSM (low scale many parameters)
mSUGRA (high scale few parameters)
DSS (SUSY with heavy scalars)
GMSB
AMB
Additional (s)particles:
NMSSM
MRSSM/N=1/N=2 hybrid
and many more
spin-0
spin-1/2
spin-1
squarks:
qR, qL q
gluino: g g
sleptons:
ℓR, ℓL ℓ
h,H,A
neutralino χi=1-4
Z, γ H±
charginos: χ±i=1-2 W± ~ ~ ~ ~ ~
R-parity
production of SUSY particles in pairs
(Cascade-) decays to the lightest SUSY particle
LSP stable, neutral and weakly interacting: neutralino (χ1)
experimental signature: missing ET

4. Supersymmetry: neutral Higgs bosons
Higgs sector: mass of A, tanβ (vev ratio)
tanβ ↑: g(Hτ,b) ↑
D0:
final states with τ and bbb
ATLAS and CMS:
tau pair final states
mA ↑ cross section ↓
large exclusion with 4.6fb-1
SM-like h
mA up to 500GeV, tanβ down to 10

5. Supersymmetry: charged Higgs boson
Signature for m(H±) <m(top)
top pair production
increase decays of top to tau
larger transverse mass
no excess 
exclude as function of BR
Interpretation in the MSSM:
Exclude down to 2%

6. Supersymmetry: Rare Decays
Courtesy of flavour group:
Indirect constraint
Bμμ:
MFV in yukawa sector
BR small: |Vtb* Vtq|2
SUSY Higgs s-channel
tanβ ↑ BR ↑
LHCb and CMS:
mass peak
BR(Bsμμ) < 4.5e-9 (CMS:7.7e-9)
BR(Bμμ) < 1e-9 (CMS: 1.7e-9)

7. Search for Supersymmetry: gluinos and squarks
Signature:
colored particles  large (pb) cross sections
many high transverse momentum jets
large missing ET
Measure background from data (CRs)/
Extrapolate sensitive variable
many cross checks possible
no exciting deviations 
Equal squark and gluino masses: 1.4TeV

8. Search for Supersymmetry: 3rd generation
CMS:
inclusive b-tagged analysis
3rd generation:
large mixing possible
could be lightest squarks
mSUGRA (cascade)
MSSM (direct)
ATLAS sbottom pair production:
2 b-tagged jets
missing ET
14TeV:
sensitivity to 2.5TeV colored sparticles
SLHC:
3TeV colored sparticles
ILC:
small mass differences
Exclusion up to 400GeV 5fb-1: sensitivity up to 1TeV

9. Search for Supersymmetry: Electroweak Sector
Signature:
associated production of charginos and neutralinos
supersymmetric version of WZ (difficult)
leptonic decays  3(and more) leptons (muons,e)
missing ET
Example:
Expect 26±5 Observe: 32 
MSSM limits:
improve on LEP
LHC:
difficult scenario: limits of order 300GeV obtained with increased leptonic BRs (intermediate sleptons)
ILC:
less dependence on BRs
reach down to small mass differences

10. Measure Supersymmetry
LHC:
5% level mass measurement
SLHC:
improve to 1%
ILC:
electroweak sector measurements
precision 0.1%
LHC:
12fold ambiguity
ILC:
solves ambiguities
LHC
LHC:
hint on Parameter unification
SLHC:
increases precision
ILC:
“measurement” of unification
S-LHC + ILC
Dark matter (deduced):
LHC:
% level with ambiguities
ILC:
0.1% level

11. Alternatives to Supersymmetry
Search for new physics:
virtual effect: deviations from the Standard Model
real effect: decay of a resonance
Sequential standard model:
Z’, W’ heavier version of Z and W
Modify couplings to get other variants
Search for a resonance
Randall Sundrum (RS):
warped Extra Dimensions
1 additional dimension (compactified)
Search for a Graviton resonance
decay: ee,μμ,γγ (mass reconstruction)
Arkani-Hamed, Dvali, Dimopoulos (ADD):
N ExtraDim macroscopic (LED)
Search for deviations wrt Drell-Yan

12. New Gauge Bosons Signature: Z’ decay to lepton (e,μ) pairs
bump in mass spectrum
W’ decay to lepton+neutrino
different models different couplings
LHC 5fb-1 7TeV:
limit at 2.3TeV (Z’SSM)
limit at 2.3TeV(W’SSM)
100fb-1 14TeV: discovery up to 4.5/5.5TeV

13. Excited Quarks Signature: jet-jet decay bump in mass spectrum
LHC 5fb-1 7TeV:
excited quarks: M> 3.35 TeV
colour octet scalars M> 1.94 TeV
mini-QBH with (6 extra dimensions): quantum gravity scales > 3.96 TeV
quark contact interactions Λ > 7.8 TeV
LHC 14TeV:
double the reach in mass
contact interaction (ll 100fb-1): 31TeV

14. Extra dimensions LHC 2.3fb-1 7TeV: LHC 5fb-1 7TeV: ADD
Ms: scale of onset of quantum gravity
n: number of extra dimensions
LHC 5fb-1 7TeV:
2.1TeV for k/Mpl=0.1 (leptons)
900GeV for k/Mpl=0.01 (photons)
(hierarchy) prejudice: reduced Planck scale <10TeV
mass of first Graviton excitation
LHC 30fb-1 14TeV (diphotons):
discovery 3.95TeV for k/Mpl=0.1
discovery 1.6TeV for k/Mpl=0.01

15. Conclusions Higgs looking promising easy SUSY easily excluded
roughly >10% precision at LHC
ILC would gain by factor 10
easy SUSY easily excluded
difficult SUSY: more luminosity essential and going to 14TeV
ILC: maximum impact for electroweak sector particles
alternative models thoroughly studied
discovery in the multi-TeV range still possible with LHC