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Introduction to the ILC-Project Machine, Physics and Experimentation

Introduction to the ILC-Project Machine, Physics and Experimentation. Roman Pöschl DESY Hamburg. CICHEP II Cairo Egypt January 2006. The International Linear Collider - ILC. ~40 km e-/e+ collider. Basic Parameters.

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Introduction to the ILC-Project Machine, Physics and Experimentation

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  1. Introduction to the ILC-ProjectMachine, Physics and Experimentation Roman Pöschl DESY Hamburg CICHEP II Cairo Egypt January 2006

  2. The International Linear Collider - ILC ~40 km e-/e+ collider Basic Parameters Energy: adjustable (scannable !) from 200 – 500 GeV precision ~0.1% Luminosity: 3-6 1034/cm2/s ~ 500 fb-1 in 4 years Polarization: 80% for electrons Polarized Positrons Machine must be upgradable tp 1 TeV ! Roman Pöschl CICHEP II, Cairo Egypt January 2006

  3. p e+ e- p Why ILC? Note: ILC will probably be put into operation after majorLHC discoveries. Why is the ILC still needed? p = composite particle:unknown s of IS partons,no polarization of IS partons,parasitic collisions p = strongly interacting:huge SM backgrounds,highly selective trigger needed,radiation hard detectors needed e = pointlike particle:known and tunable s of IS particles,polarization of IS particles possible,kinematic contraints can be used e = electroweakly interactinglow SM backgrounds,no trigger needed,detector design driven by precision Roman Pöschl CICHEP II, Cairo Egypt January 2006

  4. Technology Recommendation by ITRP We recommend that the Linear Collider is based on superconducting RF technology ~1m “This recommendation is made with the understanding that we are recommending a technology not a design! We expect the final design to be developed by a team drawn from the combined warm and cold linear collider communities, taking full advantage of the expertise and experience of both” (From the Executive Summary) Roman Pöschl CICHEP II, Cairo Egypt January 2006

  5. Global Design Effort Roman Pöschl CICHEP II, Cairo Egypt January 2006

  6. ILC Base Line Design - Recommendations Undulator based positron source 7 km rings 2 for e+/1 e- 31,5 MeV/m in Phase 1 36 MeV/m for upgrade 2 Interaction Regions Details on Basic Design Concept see: http://www.linearcollider.org/wiki/doku.php?id=bcd:bcd_home Design Report by the end of 2006 Roman Pöschl CICHEP II, Cairo Egypt January 2006

  7. Higgs Physics at the ILC • What do we think we know ? • SM Precision tests • Higgs Production at the ILC • What can we learn from the ILC • ILC/LHC Synergy Material selected from hep-ph/0511332 and P. Wienemann Lecture at ILC Summer School Beijing 2005 Roman Pöschl CICHEP II, Cairo Egypt January 2006

  8. Fit to electroweak Data mt = 172.2 GeV Validity of Standard Model assumed Legacy from Electroweak Data Bounds on mh 135 < mh < 180 GeV for  = 1019 Roman Pöschl CICHEP II, Cairo Egypt January 2006

  9. Higgs Production Mechanisms Dominant production processes: s 1/s s ln(s) Higgs-strahlung WW fusion s (fb) mH (GeV) Roman Pöschl CICHEP II, Cairo Egypt January 2006

  10. Model Independent Higgs Measurement Unique at the ILC Select di-lepton eventsconsistent with Zee/ Calculate recoil massmH2 = (pinitial – pll)2 model independent, decay-mode independent measurement! Roman Pöschl CICHEP II, Cairo Egypt January 2006

  11. Higgs Mass Measurement Combination of decay channels toincrease statistics Roman Pöschl CICHEP II, Cairo Egypt January 2006

  12. Branching Fractions Absolute measurement of BR because of decay mode I ndependent gHZZ measurement (LHC only xBR): Best way to study Higgs Yukawa couplings for a light Higgs(except for top if mH < 2 mtop): G(Hff)  mf? Demanding for detector:Excellent flavor tagging required Roman Pöschl CICHEP II, Cairo Egypt January 2006

  13. Top-Yukawa Coupling Not measurable through BR(H  tt) if mH < 2 mtop. Accessible through at least for initial ILC running s gHtt2 small cross-section high s and lumi needed complicated final state(ttWW is 10-fermion final state) huge background b-tagging crucial to suppressbkgd. and reduced combinatorialbkgd. Roman Pöschl CICHEP II, Cairo Egypt January 2006

  14. Top Yukawa Coupling - Interplay ILC  LHC ‘Standalone’ ILC measurement at high energy Roman Pöschl CICHEP II, Cairo Egypt January 2006

  15. Higgs Boson -Total Width Measurement of total Higgs decay width: mH < 160 GeV:G too small to resolve in Higgslineshapeindirect method mH > 160 GeV: G from Higgslineshape Roman Pöschl CICHEP II, Cairo Egypt January 2006

  16. bb Total Width cont’d Indirect measurement (for mH < 2 mW): Large WW fusion cross-sectionat large s  gHWW  GWW Combine with BR(HWW)measurement from Higgs-strahlung Model-independent meas. Alternative: Roman Pöschl CICHEP II, Cairo Egypt January 2006

  17. Total Width cont’d Direct measurement from lineshape (for mH > 2 mW): Roman Pöschl CICHEP II, Cairo Egypt January 2006

  18. Total Width - Precision Precision overview: Roman Pöschl CICHEP II, Cairo Egypt January 2006

  19. mH=120 GeV 20 fb-1/point Spin s dependence of Higgs-strahlung cross-section nearthreshold has discriminativepower. Higgs spin can be measuredfrom threshold scan. for J=0: rise for J>0: rise  k, k>1 Roman Pöschl CICHEP II, Cairo Egypt January 2006

  20. CP Properties (One) Method: CP from transverse polarization correlationsin H Requires exclusive reconstruction of  and a1 CP-even CP-odd separation power with 1 ab-1 at s = 350 GeVfor mH = 120 GeV: 4.7 s Roman Pöschl CICHEP II, Cairo Egypt January 2006

  21. “The holy grail” Higgs Self Coupling Self-coupling parameter ldetermines shape of potential. Essential test of EW symmetrybreaking mechanism. Roman Pöschl CICHEP II, Cairo Egypt January 2006

  22. Dl/l 20 % for 1 ab-1 Deviations from SM ? Large Sensitivity in Small Higgs Mass range from statistical errors Roman Pöschl CICHEP II, Cairo Egypt January 2006

  23. h, H neutral, CP even A neutral, CP odd H+, H- charged SUSY Higgs Bosons The SM only uses the simplest implementation of theHiggs mechanism. One extended model is theMinimal Supersymmetric Standard Model (MSSM) whichneeds two complex Higgs doublet fields (more on SUSY later). 2 complex doublets = 8 degrees of freedom 3 of them are absorbed by the longitudinal polarization statesof W+, W- and Z after EWSB  5 physical Higgs bosons Masses at tree-level are function oftwo parameters (e. g. tan b and mA). But large radiative corrections. mh < 135 GeV Roman Pöschl CICHEP II, Cairo Egypt January 2006

  24. Exploring the MSSM Higgs Sector • CP odd admixture to light CP even Higgs? • Drive (Self-) Coupling measurements to the experimental limit • - Heavy (neutral) Higgs Bosons A,H? Large Mass Splitting mH > MA Decoupling Limit Precision 1.3 GeV 800 1000 High Resolution and Small Backgrounds Roman Pöschl CICHEP II, Cairo Egypt January 2006

  25. Experimentation at the ILC Reference Design Report by End of 2006 Same time as Accelerator Report (see above) Roman Pöschl CICHEP II, Cairo Egypt January 2006

  26. Physics Requirements • a) Two-jet mass resolution comparable to the natural widths of W and Z for an unambiguous identification of the final states. • b) Excellent flavor-tagging efficiency and purity (for both b- and c-quarks, and hopefully also for s-quarks). • c) Momentum resolution capable of reconstructing the recoil-mass to di-muons in Higgs-strahlung with resolution better than beam-energy spread . • d) Hermeticity (both crack-less and coverage to very forward angles) to precisely determine the missing momentum. Roman Pöschl CICHEP II, Cairo Egypt January 2006

  27. Events with large track multiplicity and a large number of Jets (6+) are expected. Therefore: • high Granularity • good track Measurement • good Track Separation Detector Requirements Momentum: 1/p < 5 x 10-5/GeV(1/10 x LEP) ( e.g. Z-Mass Measurement with charged Leptons) Impactparameter: d0 < 5m  5m/p(GeV)(1/3 x SLD) (c/b-tagging, see next part) Jetenergy : dE/E = 0.3/(E(GeV))1/2(1/2 x LEP) (Measurement of W/Z Mass with Jets) Hermeticity : qmin = 5 mrad (to detect of events with missing energy e.g. SUSY)  3 different Approaches: SiD, Large and Huge Detector Concepts Roman Pöschl CICHEP II, Cairo Egypt January 2006

  28. LDC GLD SiD Detector Concepts Concepts currently studies differ mainly in SIZE and aspect ratio Relevant: inner radius of ECAL: defines the overall scale • Figure of merit (ECAL): Barrel: B Rin2/ Rmeffective Endcap: "B" Z2/ Rmeffective Rin : Inner radius of Barrel ECAL Z : Z of EC ECAL front face • Different approaches SiD: B Rin2 LDC: BRin2 GLD: BRin2 ECAL end-view Roman Pöschl CICHEP II, Cairo Egypt January 2006

  29. Detector Concepts - Side Views ‘Gaseous’ Tracking Detectors - TPC SiD LDC GLD Proposal: North America Europe Asia LDC = Large Detector Concept GLD = Huge Detector Concept SiD = Silicon Detector Roman Pöschl CICHEP II, Cairo Egypt January 2006

  30. The Goal … Regard: Jet Mass Reconstruction in e+e-WW, ZZ Need Separation of WW and ZZ: 4 Jets + missing momentum Ejet=30%/√E Ejet=60%/√E A LEP like detector ILC Detector 30%/E Jet Energy Resolution needed @ ILC Roman Pöschl CICHEP II, Cairo Egypt January 2006

  31. For optimal energy resolution: Need to detect every single particle in the event  Particle Flow - Find charged particles with tracker and find associated shower in calorimeter (~65% of event record) Difficult for hadrons (Shower Track Matching) Replace calorimetric energy by track energy - Find Photons in ECAL (~25%) - Find neutral hadrons in HCAL (10%) Particle Flow and Detector Layout Embedded in B-Field Need to minimize the role of HCAL Still need the best HCAL possible Roman Pöschl CICHEP II, Cairo Egypt January 2006

  32. - ILC will be high precision machine at the TeV scale • 2006 will be decisive year for machine and detector layout • Running envisaged to start ~2015 • Effort include many groups from Asia, North America and • Europe • ‘Background’ free measurement and ‘scannable’ • Centre-of-Mass energy makes it superior to the LHC • for many studies • - Parallel running to LHC highly desirable if not mandatory • Large synergy potential • Physics Program much, much larger than could have been • shown today Conclusion Roman Pöschl CICHEP II, Cairo Egypt January 2006

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