1. Search for Higgs and Supersymmetry
PASCOS 2012
Merida
June 7, 2012
Dirk Zerwas
LAL Orsay
Introduction
Standard Model Higgs (low mass)
Beyond the Standard Model Higgs
Higgs couplings
Supersymmetric particles
Conclusions

2. The LHC 2011: 5.6fb-1 delivered, 4.6fb-1 to 4.9fb-1 for analysis
Great Startup in 2012:
Gain 1TeV
4fb-1
2012: conditions becoming more difficulty but manageable
2012: 3fb-1 for ICHEP

3. The Standard Model Higgs at the LHC
Signal dominated by gluon fusion
VBF (qqH) next candidate
VH smaller with large backgrounds
ttH for higher energies
exp: common analysis then separate gluon fusion,VBF
low mass: tau (but background)
VH (difficult: only access to b)
WW (leptonic): less mass info
ZZ (leptonic): clean, low rate
photons (rare, mass info)
NLO, NNLO, NNL QCD+NLO-EW, BR: Anastasiou, Dawson, Djouadi, Harlander, Kalinowski, Kilgore, Melnikov, Spira, P. Zerwas and many more….

4. H ττ usually 1 hadronic tau transverse mass (W+misID-jet)
VBF: Plehn, Rainwater, Zeppenfeld…
usually 1 hadronic tau
transverse mass (W+misID-jet)
tau mass via LL technique
cat 1:VBF
cat 2: boosted (1j > 150GeV)
cat 3: 0/1 j >30GeV
Z decays dominate (resolution)
VBF channel (2jets) as example
better separation (recoil)
MMC
Z decays dominate
5x signal
currently essentially inconclusive

5. W/Z+H W/Z+bb BDT used (jj, separation….) order 100-150GeV pT
2 b-tagged jets
missing ET/Z-mass
dominant BG: top, Z/Wbb
similar approach
order by V pT
S/B 1% (lowest pT) - 10% (highest pT)
BG normalization from data (sidebands)
boosted: Butterworth, Salam ….

6. H WW lνlν mass information: weak (neutrinos)
Dittmaier, Dreiner…
mass information: weak (neutrinos)
Spin correlations (lepton acoplanarity)
up to 2 jets
separate by jet-multiplicity and flavour (e/μ)
at least 20GeV proj ETmiss
BDT used!
WW dominates….
no significant excess

7. H WW lνlν good description of ETmiss necessary jet categories 0,1,2
Final yesterday
H WW lνlν
good description of ETmiss necessary
jet categories 0,1,2
separated by flavor
transverse mass final discriminant
S/B order of 1/10
compatible with bg only
1sigma (yesterday)

8. HZZ 4l good lepton ID down to low pT 7/5GeV (electron/muon)
ZZ main background
Z+jets secondary background
clean channel

9. HZZ 4l Excellent description of BG: on-shell Z ok (m12)
off/on-shell Z ok
Low mass: width is detector resolution
High mass: width is width

10. Hγγ vertex reco for mass resolution
CMS: use of BDT based on the reconstructed photons (higher sensitivity)

11. The complete picture
TeVatron: (W/Z)+H to b jets
LEE!
about 2 sigma

12. 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±
Talk Pran Nath ~ ~ ~ ~ ~
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
V-Talk Pavel

13. 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

14. 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%

15. Higgs couplings at the LHC
SFitter (Lafaye, Plehn, Rauch, D.Z. and friends):
arXiv: , arXiv: ,
Contino,…
Higgs couplings at the LHC
Define couplings as deviations from SM:
Restrict total width (LHC blindness):
allow only tree-level deviations
tree-level transported to loops
no genuine deviations in loops

16. Higgs couplings at the LHC
near future couplings (if…)
ultimate couplings (if…)

17. Higgs 125GeV and Supersymmetry
A. Djouadi et al.
hep-ph/
Higgs 125GeV and Supersymmetry
need to maximize the radiative corrections to increase Higgs boson mass
electroweak scale (3TeV: maximal mixing)
mixing parameter
Large mixing, but no constraint on the stop mass:
Lindner (et al): 125GeV good for Standard Model up to GUT scale

18. 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

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

20. Search for Supersymmetry: stops
New this month
Search for Supersymmetry: stops
Direct stop pair production:
stop decay to chargino (100%)
chargino (106GeV) W* decay
2lepton signature plus jets
control regions for Z and top background
exclusion zero-suppressed
exclusion up to 140GeV (LSP: 45GeV)

21. 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
difficult scenario: limits of order 300GeV obtained with increased leptonic BRs (intermediate sleptons)

22. GMSB Going beyond LEP significantly Signature:
Low tanβ region for 2lepton search
Signature:
2 taus with jets and ETmiss
effective mass
transverse masses

23. AMSB Signature: long lifetime: chargino and LSP degenerate winos
interaction with material
bad tracks
Talk D.P. Roy
Talk Manuel Gerardo Paucar Acosta for MSSM focus Point

24. Measure Supersymmetry
SFitter: Lafaye, Plehn, Rauch, D.Z. and friends
arXiv:
arXiv:
Measure Supersymmetry
LHC:
5% level mass measurement
HL-LHC:
improve to 1%
ILC:
electroweak sector measurements
precision 0.1%
LHC:
12fold ambiguity
ILC:
solves ambiguities
LHC
LHC:
hint on Parameter unification
HL-LHC:
increases precision
HL-LHC + ILC
Dark matter (deduced):
LHC:
% level with ambiguities
Talk Pran Nath

25. Conclusions easy SUSY easily excluded SM Higgs: more data is needed
roughly >10% precision at LHC
easy SUSY easily excluded
difficult SUSY: +luminosity 14TeV-ε