SUSY and Composite models face Higgs couplings
Marc Montull
IFAE, Universitat Autònoma de Barcelona
From work done in arXiv: 1207.1716 and work in progress in collaboration with
Sandeepan Gupta and Francesco Riva
Outline
● Introduction and motivation
● Fits from data
● Sample 1: Composite PGB Higgs faces couplings
● Sample 2: MSSM faces couplings
● Conclusions
4
thof July: A new particle was discovered!
3
one question still remains...
What is it?
SM Higgs?
SUSY Higgs?
Composite PGB?
Something else?
5
● Mass
● Spin
● Parity
● Couplings
Properties
● Mass
● Spin
● Parity
● Couplings
Properties
If its spin was 2 ...
If it was a pseudoscalar...
6
● Mass
● Spin
● Parity
● Couplings
Properties
Or if considerably deviations from the SM couplings
● Mass
● Spin
● Parity
● Couplings
Properties
Not conclusive yet
6
● Mass
● Spin
● Parity
● Couplings
Properties
SM MSSM
Composite
Not much help
● Mass
● Spin
● Parity
● Couplings
Properties
Maybe able to tell us something...
6
Signal strenghts
Signal strenghts
7 0.88 0.21
Signal strenghts
Where is this data pointing to?
0.88 0.21
We can study it in a simple way if we make some basic assumptions on the new particle:
1) Spin 0
2) Same Lorentz structure as SM Higgs
3) Has rescaled couplings to fermions and EW bosons
8
We can study it in a simple way if we make two basic assumptions on the new particle:
1) Spin 0
2) Same Lorentz structure as SM Higgs
3) Has rescaled couplings to fermions and EW bosons
Higgs production Higgs decays
Gluon gluon fusion Vector boson fusion Associated ttbar Higgs
Decay to fermions Decay to EW bosons Decay to 2 photons
Reescaling of cross section and decay widths
Reescaling of cross section and decay widths
Rewriting signal strenght
Rewriting signal strenght
Rewriting signal strenght
Rewriting signal strenght
Rewriting signal strenght
Rewriting signal strenght
We find the minimum as a function of
● Aims to solve naturalness problem of SM
● Inspired from QCD, the Higgs plays a similar role as the pion, a pseudo goldstone boson.
● At low energies these models can be parametrized by the EW chiral Lagrangian
Composite Higgs as a PGB
● It is a Higgs-like state with reescaled couplings
Composite Higgs as a PGB
● The reescaling depends on the particular group structure and the fermion representation on the strong sector
MCHM:
with generic fermion representations
CMS and ATLAS combination
Some Composite models can reach the favored
region at c<0
Coupling to gauge bosons Coupling to fermions
Beyond the MCHM
Extra pseudoscalar as a PGB
Enhance gamma gamma
Invisible decays (DM)
For some representations
SM
MSSM
1112.2703 Hall et al.
MSSM
1206.1058 Azatov et al.
s
MSSM + extra D-terms U(1)
s
NMSSM with heavy singlet
Goes into favored direction
s
MSSM + heavy stops without mixing
Any stop mass such that mh=125 GeV
General conclusions?
● In Composite Higgs, we find models that can
accommodate values of c<0. If data persists there, it will be interesting.
● cb,ct plane very good to study 2HDM.
● Higgs couplings can greatly constrain parameter space of some models.
- MSSM and natural extensions.
● We'll keep studying simple natural extensions of MSSM using Higgs couplings and see what we can tell.
Conclusions
Thank you!
