Higgs @ FCC-hh

Higgs and a few other topics
from the FCC-hh Study
Albert De Roeck
CERN, Geneva, Switzerland
Antwerp University Belgium
UC-Davis California USA
IPPP, Durham, UK
BUE, Cairo, Egypt
14 January 2015
Outline
Introduction: the world after
the first run of the LHC
• The FCC-hh Higgs Studies
• Brief Discussion on SUSY,
Exotica…
• Conclusion
•
1
2012: A Milestone in Particle Physics
Observation of a Higgs Particle at the LHC, after about 40 years
of experimental searches to find it
proton
proton
2013
The Higgs particle was the last missing particle in the Standard Model
and possibly our portal to physics Beyond the Standard Model
Brief Higgs Summary
We know already a lot on this Brand New Higgs Particle!!
Mass =
A: 125.3 ±0.4 GeV
C: 125.0 ±0.3 GeV
Width =
A: < 24 MeV
C: < 22 MeV
(95%CL)
Couplings are
within 20% of
the SM values
Spin =
0+(+) preferred
over 0-,1,2
SM-like behaviour for most properties, but we look of course for anomalies,
i.e. unexpected decay modes or couplings, multi-Higgs production…
Many questions still Unanswered
Is it THE Standard Model Higgs or a messenger of New Physics ?
How can we explain a Higgs mass ~ 125 GeV? What stabelizes
its mass? New Physics e.g. Supersymmetry?
What explains the mass pattern of the particles we observe?
What is Dark Matter and Dark energy?
Neutrino masses and properties?
Where is the antimatter in the Universe? How did it disappear??
Need for precision measurements with ~100x the present statistics
LHC upgrade ! Experiment upgrades!! New machines!?!
A Higgs…
Stockholm Nobel Symposium
May 2013
But there there still a lot of questions…
Consequences for our Universe?
Precise measurements
of the top quark and
first measurements of the
Higgs mass:
Our Universe meta-stable ?
Will the Universe disappear
in a Big Slurp? (NBCNEWS.com)
New Physics inevitable?
But at which scale/energy?
N. Arkani-Hamed
Supersymmetry? New Physics?
H. Murayama
allowed
excluded
Dark Matter: The Next Challenge !?!
Astronomers found
that most of the
matter in the Universe
must be invisible Dark
Matter
‘Supersymmetric’ particles ?
F. Zwicky 1898-1974
Vera Rubin ~ 1970
8
The Future…
Europe Strategy Group
The LHC schedule
From the European Strategy Group
Similar recommendation from the Snowmass studies in the US
The FCC
Future Circular Colliders: The return of studies for circular machines!
A world-wide study…
Seizing the Moment… (?)
Popular press
early 2014
FCC-hh: a Proton-Proton Collider
“Machine Options”
FCC Schedule: First Step
Study reports requested for the next strategy meeting in 2018
Physics Program: Key Topics
• Properties of the new Higgs boson, precise
determination of its characteristics
• High mass reach for new particles and interactions
• Precision measurements
• Rare process
-> However, no “no-loose theorem” known, as yet.
Higgs mass precisions
~ 100-200 MeV enough?
Higgs self-coupling precision
Better than 20% needed?
Higgs couplings? Few %? Better?
(J. Wells et al., arXiv:1305.6397)
Preliminary Machine Parameters
Version 1 (Feb 2014)
Used in the physics
studies
Detector Studies
Inspired by the LHC detectors
Extended forward region
Magnetic configurations studied
Only software trigger?
…
Studies in progress…
Workshop 3/4 February
https://indico.cern.ch/event/358198
Organization
M.Mangano
More details by M. Mangano
later this week
Goals
More details & update
by M. Mangano later this week
Organization FCC-hh
Will discuss mostly Higgs group plans. Ian will tomorrow cover more..
Topics in the Higgs Group
Overview meeting on 24 November 2014
Web page: http://indico.cern.ch/event/348468/
Higgs @ FCC-hh: Cross Sections
M. Mangano
Higgs @ FCC-hh: Cross Sections
M. Mangano
Higgs @ FCC-hh
M. Mangano
Studies Ongoing in the FCC-hh
Higgs Group
All preliminary and work in progress
See web page for more details
http://indico.cern.ch/event/348468/
Slides taken from the contributions…
Higgs @ FCC-hh: Cross Sections
A Djouadi et al.
Good example:
The CERN Higgs
Yellow Reports…
Higgs @ FCC-hh: Cross Sections
Higgs @ FCC-hh: Cross Sections
Higgs @ FCC-hh: Cross Sections
Higgs @ FCC-hh: Cross Sections
Higgs with Extreme Kinematics
M. Mangano
Higgs with Extreme Kinematics
ttHiggs with Boosted Tops
C. Helsen
Boosted objects will become a key ingredient to many analyses !!
ttHiggs with Boosted Tops
High pT Boosted Higgses
Ennio Salvioni
High pT Boosted Higgses
Off-Shell Higgs Production
Access to ct and cg couplings…
Alexandr Azatov
Off-Shell Higgs Production
Ratios for Precision: ttH/ttZ
Ratios for Precision: ttH/ttZ
Hua-Seng Shao
Ratios for Precision: ttH/ttZ
Hua-Seng Shao
Ratios for Precision: ttH/ttZ
The Higgs Self Coupling!
A key measurement for our understanding of the Higgs field potential!
in pp
arXiv1308.6176
Difficult measurements!!:
Evaluation till ongoing
for HL-LHC sensitivity
e+e- machines with
sufficient energy and
FCC-hh can measure
this process
gg-> HH Study
gg-> HH Study
gg-> HH Study
gg-> HH Study
Minho Son
gg-> HH Study
Measurement of ttHH ?
M. Spanowsky
Measurement of ttHH ?
HH Production in VBF
J. Rojo
HH Production in VBF
HH Production in VBF
C3 is the coefficient of the hhh term in the Lagrangian (the Higgs trilinear)
and C2V is the coefficient of hhVV.
Probing Light Yukawa Couplings
J. Zupan
Probing Light Yukawa Couplings
Probing Light Yukawa Couplings
Probing Light Yukawa Couplings
Resonant HH Production in VBF
A Kotwal
Search for new strong
dynamics, with resonance
decays to Higgses
BDT Multivariate
discriminant
Resonant HH Production in VBF
Decay channel of choice H-> tau tau
A few other FCC-hh Studies
Supersymmetry, Exotica…
This is the main ‘meat’ for the FCC-hh
More in other talks this week
Supersymmetry Studies
Supersymmetry Searches
Natural SUSY? Would be with a very large (unnatural) fine tuning
Searches for New Particles in pp
Searches for pair produced SUSY particles
FCC-hh
-Reach sparticle masses
search up to about 15 TeV
for squarks of light quarks
and 7 TeV for stops
-Excited quarks probe the
structure of quarks down to
4x10-21 m
-Discovery of resonances up
to masses of 40 TeV
Upper limit for higher Higgs
mass in 2HDM models?
Exotica Searches
Snowmass 2013 Study
Room for Blue Sky Thinking!
Example: If we produce Dark Matter particles candidates, can we be
sure it is really DM? Check the interaction with matter in a detector!!
Long timescales: Time to explore new ideas!!
Conclusion
• In 2012 we found a Higgs Boson at the LHC. Next
LHC run @ 13/14 TeV will hopefully reveal even more.
Higgs coupling measurements ~ 3-5% but will likely
have limited precision on HHH coupling.
• High energy pp colliders, eg at 100 TeV, will extend
the reach for new particles and interactions.
• At the FCC-hh we can explore the large Higgs cross
sections and available kinematics phase space for
new measurements/additional couplings and precision
measurements. HHH coupling expected to be
precisely measurable.
• Here we showed a number of ideas from the Higgs
working group. Quantitative results are in preparation..
Backup
Precisions Comparison
Supersymmetry MSSM Coverage