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

1. The FLC Group(Future Linear Collider)oder(Forschung an Lepton Collidern) Erika Garutti Erika Garutti

2. 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 Erika Garutti

3. 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 Erika Garutti

4. Hardware activities @ Build a detector for experiments @ 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 Erika Garutti

5. The TESLA detector Erika Garutti

6. Hardware activities @ HCAL ECAL New Physics implies: New requirements • New technology • New materials • Tracking: Time Projection Chamber (TPC) • Calorimetry: Hadronic Calorimeter (HCAL) TPC Erika Garutti

7. Gas Electron Multiplier read out 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 Erika Garutti

8. Time Projection Chamber TPC Lab. @ DESY • built and tested @ DESY • Next steps: resolution and tracking studies • in 5T magnetic field • with e- beam • with laser system Erika Garutti

9. Hadronic Calorimeter First prototype already in operation @ 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 Erika Garutti

10. Silicon PhotoMultiplier (SiPM) MEPhI&PULSAR SiPM Pixels of the SiPM Technology to the limit • 1 mm2 photo-detectors/1024 pixels • Single photon signal • High granularity  small tiles • 800.000 channels read out for TESLA Erika Garutti

11. Software activities @ • 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 Erika Garutti

12. Analysis @ 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 ℓν Erika Garutti

13. H + e * Z - Z e ZH X ZH qqbb ZH WW qq Analysis @ Higgs main production mechanism at the ILC: Higgs-strahlung process Erika Garutti

14. Analysis @ 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 M=MZH+ihMZA gHbb vs gHWW Erika Garutti

15. The Higgs potential • Isthe 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 < 3s Erika Garutti

16. 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) Erika Garutti

17. 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 a=60% LEP-like detector LC design goal Erika Garutti

18. Super Symmetry (SUSY) • Fundamental symmetrybetween Fermions and Bosons • Doubles the number of existing particles • Symmetry breaking  no super-symmetric particle observed by now Erika Garutti

19. 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 Erika Garutti

20. 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 Erika Garutti

21. : 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 Erika Garutti

22. YOU @ ?!?! To know more about what YOU could do @ 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 !!! Erika Garutti