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Roma, 12 ottobre 2005. Physics : ILC vs LHC. ….after Snowmass 2005. Barbara Mele Sezione di Roma. Advances in Physics at Snowmass. Higgs Supersymmetry Beyond the Standard Model Top / Quantum Chromodynamics. LHC/ILC Connections Cosmological Connections - PowerPoint PPT Presentation
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Physics : ILC vs LHC
Barbara Mele
Sezione di Roma
Roma, 12 ottobre 2005
….after Snowmass 2005
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Advances in Physics at Snowmass
Higgs
Supersymmetry
Beyond the Standard Model
Top / Quantum Chromodynamics
LHC/ILC Connections
Cosmological Connections
Radiative Corrections (Loopfest)
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The Charge for the Physics Working Groups
1. What are the most important measurements that the ILC should perform in the subject area of your working group?
2. What are the key measurements by which the ILC will add to what is already known from the LHC?
3. What are the processes and measurements new to the community
in the past few years that further motivate the case for the ILC?
4. For each of these measurements, what criteria for the detectors are necessary to allow measurements to the appropriate precision?
5. Are there detector capabilities that are not strongly challenged by
the list of processes in #1 and #2? Is this acceptable, or are there
additional measurements that should be added to the list against
which detectors will be evaluated?
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started in Spring 2002
485 pages !
~ 120 authors
. . .
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Precision Higgs physics at the ILC
• model-independent observation
• mass
• absolute branching ratios
• total width (mod.indep.)
• spin, CP
• top Yukawa coupling
• self coupling
most measurements at the percent level!
Garcia-Abia et al
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SupersymmetryTwo methods to obtain absolute sparticle masses:
in the continuum: at the kinematic threshold:
many more observables than just masses:
- angular distributions, FB-asymmetries- cross sections- LR-asymmetries- ratios of branching ratios
mass precision 0/00 – 0/0
possibility to determine SUSY parameters without many model assumptions
Martyn
Freitas
(polarized beams)
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Mass determination for 300fb-1 (thus 2014) LHC:Toy MC from edges, thresholds to masses
Polesello et al: use of χ1 from ILC (high precision) in LHC analyses improves the mass determination
LHC:LHC:
D. Zerwas, Snowmass talkAllanach et al
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MSSM parameter determination
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SUSY W-group conclusionsSUSY W-group conclusions
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DM/DM main sensitivity
bulk 3.5%
focus 1.9%
co-ann. 6.5%
funnel 3.1%
01 R R 1,e , ,
0 0 0 0 0 01 2 1 3 1 1 1 1 1, , , , ( )
0 01 1 1,
0 01 1A , ,
The Cosmic Connection
SUSY provides excellent candidate for dark matter (LSP)
Other models also provide TeV-scale WIMPs
How well can the properties of the DM-candidates (to be found ataccelerators) be compared to the properties of the real DM (inferred from astrophysical measurements) ?
ALCPG study/prel.
matches precision of future CMB exp.
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Dark Matter : is it the Susy LSP ?Dark Matter : is it the Susy LSP ?
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Difficult at LHC
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No elementary Higgs?Cross section for vector boson scattering violates unitarity at ~1.2 TeV, if forces remain weak and no new resonances appear
Birkedal et al.Krstonosic et al.
ILC sensitivity deep into multi-TeV region from VB final states
eff. Lagrangian parametersof strong EWSB:
Higgsless model: new resonancein WZWZ
Coupling structure from ILC if resonance seen by LHC
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Effective 4-fermion contact interactions
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What if “unexpected” New Physics ?
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Top
Hoang et al
it’s there for sure!Threshold scan provides excellentmass measurementTheory (NNLL) controls mt(MS) to 100 MeV
Heinemeyer et al
precise mtop vital for
- improved SM fits- MSSM (mh prediction)- DM-density in mSugra- . . . .
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EW precision measurements :
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Phisics Benchmarks for the ILC detectors
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