The%20FLC%20Group%20(Future%20Linear%20Collider)%20oder%20(Forschung%20an%20Lepton%20Collidern)

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The FLC Group(Future Linear Collider)oder(Forsc
hung an Lepton Collidern)
Erika Garutti
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What does a physicist do the whole day long?

• Hardware ? development/construction and test
• of advanced high tech. detectors
• Software ? development of analysis programs
• and detector simulations
• Analysis ? analysis of experimental data

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What does a physicist do the whole day long?
need to understand the physics to address

• Hardware ? development/construction and test
• of advanced high tech. detectors
• Software ? development of analysis programs
• and detector simulations
• Analysis ? analysis of experimental data
  

need to understand the detector to simulate
need to understand simulation and hardware
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Hardware activities _at_

• Build a detector for experiments _at_ the ILC
• the facility for the physics of the next 50 years

The ILC will be COLD!!!

• max. Energy 500 800 GeV
• superconductive cavities
• High Luminosity
• 33 km long

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The TESLA detector
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Hardware activities _at_
HCAL
ECAL

• New Physics implies
• ?New requirements
• New technology
• New materials
• Tracking Time Projection Chamber (TPC)
• Calorimetry Hadronic Calorimeter (HCAL)

TPC
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Time Projection Chamber

• large volume 3.5m diameter
• simpler mechanics compared to wire chamber
• distance between holes resolution (100mm)
• easy 3D track reconstruction
• low cost

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Time Projection Chamber
TPC Lab. _at_ DESY

• built and tested _at_ DESY
• Next steps resolution and tracking studies
• in 5T magnetic field
• with e- beam
• with laser system

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Hadronic Calorimeter

• First prototype already
• in operation _at_ DESY
• - high granularity
• small tile size
• multiple layers
• high number of channels
• need of small and cheap photo-detectors
• for independent fiber read out
• new technology development

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Technology to the limit

• 1 mm2 photo-detectors/1024 pixels
• Single photon signal
• High granularity ? small tiles
• 800.000 channels read out for TESLA

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Software activities _at_

• Development of tracking software for TPC
• ? detector simulation
• Development of energy reconstruction software
• for HCAL
• ? detector simulation
• MC simulation of ILC detector
• ? geometry
• ? detectors property
• ? detector studies

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Analysis _at_
Higgs physics at the ILC ? Understanding of mass
generation ? Higgs couplings to bosons and
fermions

• If there is a Higgs
• the main production mechanisms are
• High energy ? WW fusion

Low energy ? Higgs-strahlung In the channel
ZH ? ZWW ? 4jets l ?
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Analysis _at_
Higgs main production mechanism at the
ILC Higgs-strahlung process
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Analysis _at_

• After the Higgs discovery (LHC?), the ILC will
  study
• Cross section Quantum numbers
  Couplings

CP violating conrib. to SM s
H?WW?bb nn, BG HZ?bb nn
MMZHihMZA
gHbb vs gHWW
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The Higgs potential

• Is the Higgs the Higgs?
• Check l M2H/2v2

ee? ZHH ? 6 jets

• few tens of events
• reconstruct observable from 3 dijet masses
• ?with LEP-like detector significance lt 3s

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WW/ZZ separation
Dilution factor vs cut integrated luminosity
equivalent

• No Higgs scenario
• WW scattering violates unitarity at 1.2TeV, or
  new forces show up
• access EWSB mechanism from WW scattering
• analyze ee?WWnn and ee?ZZnn channels
• need to separate ZZ background
• no kinematic fit possible due to the neutrinos

TESLA
(s/MW2)2
LEP
? We need a high resolution detector (a factor 2
better than LEP) OR we pay with luminosity
(40 more needed)
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Jet energy resolution

• Challenge separate W and Z in their hadronic
  decay mode
• Dijet masses in WWnn, ZZnn events (no kinematic
  fit possible)
• ? 40 more lumi is required for same resolution
  if a60

LEP-like detector
LC design goal
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Super Symmetry (SUSY)

• Fundamental symmetry between Fermions and Bosons
• Doubles the number of existing particles
• Symmetry breaking ? no super-symmetric particle
  observed by now

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Start from the past to understand the future

• The OPAL experiment at LEP (CERN)
• Precision measurement of Z0 / W
• Higgs search
• SUSY, search for new physics
• Topics covered at FLC
• - heavy Quarks backward-forward asymmetry
• b-fragmentation
• - Triple-gauge-boson coupling
• - Higgs search double-charge Higgs bosons
  production
• - SUSY search heavy stable charge particles
• - Technicolor search

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Start from the past to understand the future

• The H1 experiment at DESY
• Understand QCD and the
• proton structure
• Topics covered at FLC
• - heavy Quarks production
• b-fragmentation

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a large international group

• Group leader
• Prof. Dr. Rolf-Dieter Heuer (Uni HH)
• Dr. Ties Behnke (DESY)

8 wissenschaftliche Mitarbeiter (promoviert) 1
Hochschulassistent Klaus Desch 1
DESY-Wissenschaftler Felix Sefkow 8
DESY-Fellows Steve Aplin, Karsten Buesser, E.G.,
Markus Hamann, Thorsten Kuhl, Roman Poeschl,
Alexei Raspereza, Peter Wienemann 1
Gastwissenschaftler Vasiliy Morgunov
10 Doktoranden Philip Bechtle, Filip
Franco-Sollova, Marius Groll, Andreas Imhof,
Tatsiana Klimkovich, Thomas Krämer, Thorsten Lux,
Niels Meyer, Jorgen Samson, Blanka Sobloher
4 Diplomanden Markus Ball, Matthias Enno
Janssen, Hendrik Meyer, Oliver Wendt
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YOU _at_ ?!?!

• To know more about what YOU could do _at_ FLC
• Contact Klaus Desch, Ties Behnke, Rolf Heuer,
  Felix Sefkow
• Surf www-flc.desy.de
• E-mail in DESY-Telephone book
• (www.desy.de)
• Pass by Building 1d
• There is a lot to be done for the
• physics of the future !!!