physics at a future linear collider
DESCRIPTION
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 PresentationTRANSCRIPT
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Physics at a future Physics at a future Linear ColliderLinear 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
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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?
– ILC, SLHC, LHeC, CLIC, ν-fact, DLHC, μ-collider,…. Pre-SUSY, Bonn, 19-21.8.2010 Gudrid Moortgat-Pick
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(My ) Pragmatic (My ) Pragmatic approachapproach
• 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:
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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? 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
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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? 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
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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
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The unique advantage of e+e-
• 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
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At the precision frontier: the LC
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ICFA Parameter Group
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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
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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)
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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!
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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 !
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mW vs. central value sin2θeff
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→ Consistent with SM and SUSY
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mW vs. SLD-value sin2θeff
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→ not consistent with the SM
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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:
– Only Higgs @LHC– No hints for SUSY
• Deviations at Zpole– Hints for SUSY
• Discrepancy
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SUSY Constraints from GigaZ
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What’s needed? What’s needed? ….polarized beams….polarized beams
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e+ polarization is an absolute novelty! Expected P(e+) ~ 60%
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Polarized positrons
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Polarized cross sections in general
Polarized cross sections can be subdivided in:
σRR, σLL, σRL, σLR are contributions with fully polarized L, R beams.
In case of a vector particle only (LR) and (RL) configurations contribute:
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Effective polarization Effective polarization:
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Relation between Peff and ALRHow are Peff and ALR related?
That means:
With pure error propagation (and errors uncorrelated), one obtains:
With
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Gain in accuracy due to P(e+)
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Only SM-like Higgs at early LHC• Interpretation for ILC
– best-suited for studying Higgs properties
– precise determination of couplings:
determination of Hbb is crucial!
– distinction: SM- versus SUSY Higgs– t t H and trilinear Higgs coup. challenging
• But is then really 500 GeV as 1st step needed?– Optimize running scenarios (tunable energy, polarization)
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Determination of Higgs properties
LHC input for optimal choices of running scenarios !
→ Higgs spin
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Higgs physics at ILC• Higgs Strahlung WW fusion
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Higgs mass• Use Higgsstrahlung: due to well-known initial state
and well-observed Z-decays– Derive Higgs mass independently from decay !
– Only possible at a LC!
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Higgs properties
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Something ‘new’ detected at early LHC• SUSY-like signals (many tics at big questions!)
– At least partial spectrum accessible at ILC – ‘light’ SUSY consis- tent with precision fits
• Extra gauge bosons and/or large extra dimensions (some tics at big questions!)– High precision in indirect searches allow
model distinction and couplings determination
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Goals and features at a Goals and features at a LCLC
• Direct production up to kinematical limit– tunable energy: threshold scans !
• Extremely clean signatures– polarized beams available– impressive potential also for indirect searches via
precision• Unraveling the structure of NP
– precise determination of underlying parameters– model distinction through model independent searches
• High precision measurements– test of the Standard Model (SM) with unprecedented
precision– even smallest hints of NP could be observed
Discovery of new phenomena via high energy and high precision!
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Discovery of SUSY
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SUSY mass measurement im continuum
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Masses and spin via threshold scans
• Assume LHC provides mass of a SUSY particle:
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Mass measurement of the LSP mass
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Properties of WIMP’s: Properties of WIMP’s: mass+spinmass+spin
• Reconstruct the `invisible’:
– via recoil mass distribution
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Verify SUSY properties at ILC
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Slepton `chiral’ quantum numbers
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Sensitivity to heavy SUSY Sensitivity to heavy SUSY particles particles
• Challenging scenarios: – multi-TeV sfermions, only few light
gauginos (‘focuspoint-like’) also very difficult for
LHC …– sensitivity to heavy sneutrinos in t-channel
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Suitable observable: Precise measurement of asymmetry copes with multi-TeV particles !
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Free parameters in the MSSM
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SUSY parameter determination
• Exploit just light SUSY particle spectrum at ILC and determine the parameters (see below)• Combine it with LHC results
via prediction of heavier states
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SUSY multi-parameter fits: SUSY multi-parameter fits: LHCLHC
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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
• LHC/ILC interplay: G. Weiglein, Phys. Rept. 426, 47 (2006), hep-ph/0410364
• Polarization+Spin: GMP, POWER report, Phys. Rept. 460,131 (2008), hep-ph/0507011 webpage: www.ippp.dur.ac.uk/LCsources
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Beam polarization at colliders
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Electron polarization
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How to describe the spin?
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Remarks about couplings structureDefinition: Helicity λ=s * p/|p| ‘projection of spin’
Chirality = handedness is equal to helicity only of m=0!
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General remarks, cont.
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Background suppression
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Dark matter analysis at LC• High precision in parameter determination
required for reliable DM prediction– Parameter ranges where abrupt changes of neutralino character happen
– Precise determination of M1,M2….required
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V. Morton-Thurtle