Pre-SUSY, Bonn, 19-21.8.2010 Gudrid Moortgat-Pick 1 Physics at a future Linear Physics at a future Linear Collider Collider Gudrid Moortgat-Pick Hamburg University, 20.8.2010 • ‘Big’ HEP questions •LC technical requirements • LC physics in view of LHC results • Techniques at the high-energy e + e - collider • Summary and some literature for further studies
Physics at a future Linear Collider. ‘Big’ HEP questions LC technical requirements LC physics in view of LHC results Techniques at the high-energy e + e - collider Summary and some literature for further studies. Gudrid Moortgat-Pick Hamburg University, 20.8.2010. - PowerPoint PPT Presentation
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Pre-SUSY, Bonn, 19-21.8.2010 Gudrid Moortgat-Pick
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Physics at a future Physics at a future Linear ColliderLinear Collider
• ‘Big’ HEP questions•LC technical requirements• LC physics in view of LHC results• Techniques at the high-energy e+e- collider• Summary and some literature for further studies
Sceptical thoughts Sceptical thoughts before….before….• Many options and ideas for experiments
– Most are expensive, some ‘rather’ cheap– Should cost be a criteria? Or diversity of the physics
programme?• Priority lists are needed
– Many lists exist (CERN strategy group, P5, UK roadmaps, German roadmaps…)
• But big experiments require long term planning– To which extent are physics needs in advance
predictable? Particle scales? Physics Models? …• Can we really weight today all options?
• Physics: what are the ‘big’ questions?– Define steps ... ‘physics milestones’– Identify which models tic which question– Common feature requirements: measure masses,
couplings, spin, quantum numbers … ‘verify at quantum level’
• Machine: next physics milestone achievable?– Technical requirements for a LC have been defined– Synergy with other experiments– Some degree of flexibility required: ‘the unexpected’
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‘‘Big’ questions …and possible Big’ questions …and possible answersanswers
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• Shortcomings of the Standard Model•Establish electroweak symmetry breaking LC •Hierarchy problem? •Unification of all interactions? •Embedding of gravity •Baryon asymmetry in Universe? •Dark matter •Neutrino mixing and masses
• Why TeV scale?• Protect hierarchy between mweak and mplanck
• Dark matter consistent with sub-TeV scale WIMPs
Higgs mass with respect to large quantum corrections:
‘‘Big’ questions …and possible Big’ questions …and possible answersanswers
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• Shortcomings of the Standard Model•Establish electroweak symmetry breaking LC•Hierarchy problem? LHC, LC•Unification of all interactions? LC•Embedding of gravity cosmo,LHC, LC•Baryon asymmetry in Universe? v-, cosmo, LHC, LC •Dark matter v-, cosmo, LHC, LC•Neutrino mixing and masses v-, cosmo-exp.
• Why TeV scale?• Protect hierarchy between mweak and mplanck
• Dark matter consistent with sub-TeV scale WIMPs
‘‘Big’ questions …and possible Big’ questions …and possible answersanswers
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• Shortcomings of the Standard Model•Establish electroweak symmetry breaking LC•Hierarchy problem? LHC, LC•Unification of all interactions? LC•Embedding of gravity cosmo,LHC, LC•Baryon asymmetry in Universe? v-, cosmo, LHC, LC •Dark matter v-, cosmo, LHC, LC•Neutrino mixing and masses v-, cosmo-exp.
• Why TeV scale?• Protect hierarchy between mweak and mplanck
• Dark matter consistent with sub-TeV scale WIMPs
Why a Linear Collider?
Key features of the e +e-( and γe, γ γ) collider:– Precisely defined and known cms energy of hard process (machine requirements: low beam energy spread, low beamstrahlung)– Tunable cms energy (machine requirements: flexibility, high luminosity)– Polarized initial beams (machine and detector requirements: – Clean and fully reconstructable events (hadronic, invisible) (detector requirements: jet, lepton reconstruction, full hermiticity)– Moderate backgrounds: no trigger required! rather unbiased physics….
Large potential for direct discoveries and via high precision !Pre-SUSY, Bonn, 19-21.8.2010 Gudrid Moortgat-Pick
• Their clean signatures allow precision measurements
• Sensitive to the theory at quantum level (i.e. contributions of virtual particles, ‘higher orders’)!
• Such measurements allow predictions for effects of still undiscovered particles, but whose properties are defined by theory.
t
At the precision frontier: the LC
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ICFA Parameter Group
Synergy effects: LHC2FC@CERN 2/09
Questions from early LHC data ( ~10 fb-1 )• ‘Famous’ 3 cases (cf. CERN strategy
documents) :
– LHC not detected anything
– LHC only detected SM-like Higgs
– LHC detected some new physics
• What could the LC do – in first ILC stage of 90 up to 500 GeV?
– in LC upgrades?
– in multi-TeV CLIC option?Pre-SUSY, Bonn, 19-21.8.2010 Gudrid Moortgat-Pick
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Nothing found at (early) LHC
• Interpretation for ILC?– ‘Top’ physics
– indirect searches in bb, cc, l l ( large ED, CI)
– ew precision runs from Z-pole data
• But is then really 500 GeV as first ILC stage needed?– or better 350 GeV? High-lumi Z-factory?
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Physics up to sqrt(s)=500 GeV: top
mtop= 173.3 +- 1.1 GeV
Top mass
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•We expect at the LC:
• From running at tt threshold:• Measurement of a ‘threshold mass parameter’’ with high precision: < 20 MeV •+transition to suitably defined (short-distance) top-quark mass, e.g. MS mass
δmtexp<100 MeV (dominated by theory
uncertainty)
Importance of ‘top’ mass
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EW precision measurements
• GigaZ option at the ILC: – high-lumi running on Z-pole/WW– 109 Z in 50-100 days of running– Needs machine changes (bypass in the current
outline)
• High precision needs polarized beams
• Provides measurement of sin2θW with unprecedented precision!
Electroweak precision data
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Measuring the ew mixing angle
• Measuring the AFB ,
ALR can be interpreted
as measuring sin2θW
• LEP result: sin2θW=0.23221±0.00029
• SLC result: sin2θW=0.23098±0.00026
– Discrepancy between AFB and
ALR -> impact on Higgs tests !
mW vs. central value sin2θeff
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→ Consistent with SM and SUSY
mW vs. SLD-value sin2θeff
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→ not consistent with the SM
mW vs. LEP -value sin2θeff
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→ not consistent with neither SM nor SUSY
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Blondel scheme for GigaZ
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Relevance in worst case scenariosRelevance in worst case scenarios• Hints for new physics in worst case scenarios:
SUSY multi parameter fits: SUSY multi parameter fits: LHC+ILCLHC+ILC
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Aside: Disney World of SUSY Aside: Disney World of SUSY scenariosscenarios
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Pure particle counting as justification of the energy scale -but what’s about the achievable precision? -but what can be learned via precisions observables at lower energies? (GigaZ, AFB,…)General feature: in order to be consistent with existing experimental bounds, e.g. with gμ-2:
a few gauginos have to be rather light ! ….sufficient as 1.step
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Indirect searches: extra dimensions
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Extra dimensions
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Physics up to 1 TeV
•Direct search for extra dimensions
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Direct search for extra dimensions
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Multi-TeV option at CLIC - Higgs
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Summary• e+e- physics (LEP, SLC, B-factories) has been the core
of high precision physics over the last decade • We expect a fascinating future in the next years: LHC
will shed first light on the mysteries of EW symmetry breaking
• Rich program and high physics potential of a LC: The LC will unravel the new physics and enter a new
precision frontier!– Thresholds scans and polarized beams mandatory
• Staged approach of a LC seems reasonable… Stay tuned for the LHC and the (I)LC!
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Some literature• ILC physics: TESLA TDR, physics part hep-ph/0106315 ILC RDR, arXiv:0712.1950