1. F. Richard 11/27/091 Detectors for future LCs ECFA meeting at CERN F. Richard LAL/Orsay

2. F. Richard 11/27/092 Outline Introduction Recent evolutions on detectors (IDAG) Illustration of LC physics from the LoIs Which scenario ? R&D activities Collaboration CLIC ILC Future workshops CERN LC10 Conclusions

3. Introduction In August 2009 an international panel (IDAG) has validated two detector concepts SiD and ILD An overall strategy has been defined by the research director (RD) S. Yamada in consultations with SiD & ILD, with the partners on R&D, on MDI (push pull) etc.. to meet the detailed design goal for the 2 detectors end of 2012 in conjunction with the TDR for the machine There is increased participation of CERN on detectors for the future LC following the DG vision of a LC CERN project embedding the two proposed technologies This major step, endorsed by ILCSC, is meant to avoid duplication of efforts in particular for the detectors and to unite the LC community F. Richard 11/27/093

4. The IDAG process IDAG is an international panel (appointed by ILCSC+RD) comprising 16 members (experimentalists, theorists, machine experts) and chaired by M. Davier It went in great detail through the 3 LoIs proposed for the ILC pogram (CERN has signed them) in tight connection with the teams ILD & SiD based of PFLOW were validated while IDAG recommends continuing R&D on dual RO calorimetry studied by the 4 th concept ILD and SiD have important differences (size, tracking) but similar calorimetry at the present stage This could change if dual RO methods are validated through the R&D effort F. Richard 11/27/094

5. 66205500 ILD SiD 7755 6200 5F. Richard 11/27/09

6. Push pull Importance of push-pull aspects (also for CLIC) which will be studied in detail by ILD & SiD Why 2 detectors ? Scientific arguments (competition, independence, confidence on results) Complementarity with contrasting technologies (OK if data can be combined) Risk mitigation: allows for high performance detectors with reasonable risks (e.g. failure with a large SC Coil) Sociological: a worldwide project needs to accommodate a diversity of cultural approaches … F. Richard 11/27/096

7. LC physics LC physics was realistically illustrated by LoIs with full simulation & full reconstruction, including background effects in the ILC environment Excellent s/b and accuracy is confirmed within SM or SUSY Discovery could proceed through direct observation but recall that LC precision (as for LEP but much better) allows to test scales well beyond ECM in certain scenarios (e.g. Z, extra dimensions) F. Richard 11/27/097

8. Reference reactions F. Richard 11/27/098

9. 9 ee->Z*->HZ The recoil mass technique with Z->µ+µ- gives a very clean signal at s=MH+110 GeV Works even if H decays into invisible or complex modes ZZH coupling constant determined to ~1% In the SM case most BR ratios known 10 times more precisely than at LHC Higgs still visible (HZ) if 1/10 SM ILD Full Simulation

10. F. Richard 11/27/0910 Top at LC LC 1 pb, LHC 1nb but with larger uncertainties Very good s/b at ILC and energy conservation allows to reconstruct modes with a neutrino (cleaner modes, AFBt) Mt and t with 50 MeV error, 0.4% on cross section Polarisation & AFBt allows to separate tR from tL (extra dimensions)

11. An open scenario The light Higgs scenario cannot be guaranteed and LHC/Tevatron results may change our ideas based on MSSM/SM These uncertainties justify an open scenario recalling however that ILC 0.5-1 TeV is the shortest path We need to be ready to adapt to what happens at LHC and decide accordingly ILC will extend its studies to 1 TeV physics and CLIC will explore up to 3 TeV F. Richard 11/27/0911

12. Detector R&D A major activity, well coordinated by large international collaborations, the largest being CALICE on calorimetry: 336 physicists/engineers from 57 institutes and 17 countries from the 4 regions CERN has joined the largest R&D collaborations While there is proof of principle of the various innovative technologies we need to enter in the phase of technological prototypes with realistic cooling, power pulsing, material budget Excellent training ground to maintain high tech within HEP and provide data for young physicists F. Richard 11/27/0912

13. R&D organisation Test beams at CERN, DESY, FNAL etc.., have been actively used to test proof of principle prototypes while in the next step technological prototypes, e.g. ECAL supported by EUDET, will have integrated electronics, cooling etc.., R&D is well supported in Europe EUDET->AIDA with connections to s-LHC An issue, in the absence of a world laboratory housing ILC activities, is the international monitoring of the detector R&D So far the PRC of DESY has played a very useful role F. Richard 11/27/0913

14. CLIC and ILC CLIC aims at a CDR in 2010 after establishing a proof of principle by CTF3 and at a TDR ~2016 for a 3 TeV project with a 500 GeV 1 st step ILC has provided help and tools to develop a CLIC detector concept ILD and SiD (with increased size) are viable at 3 TeV with thicker calorimeters (8 I ) Two issues however: time structure and increased background at higher energies At 3 TeV interactions deposit ~25 GeV every 0.5 ns with impact on jet reconstruction F. Richard 11/27/0914

15. CLIC and ILC Key aspects: time stamping in µvertex (Si3D ) and forward calorimetry For instance ILD assumes 25 µs (~30 bunches) time integration at µvertex while CLIC should aim at ~10 ns Note also that the excellent collaboration with CLIC extends to MDI+Engineering with the help of CERN experts (LHC detectors, with very active participation from CMS engineers) While the spontaneous collaborative approach seems to work very well, some overview is needed and a ILC- CLIC working group is being organized in agreement with the RD and ILSSC F. Richard 11/27/0915

16. Workshops So far there is unification of workshops for the GDE and CLIC So far there is unification of workshops for the GDE and CLIC Typical attendance at Albuquerque (NA) and CLIC09 at CERN ~250 participants with large overlap Typical attendance at Albuquerque (NA) and CLIC09 at CERN ~250 participants with large overlap Unification on detectors was revived at the ECFA workshop in Warsaw (2008) and will be amplified at the CERN LC workshop Unification on detectors was revived at the ECFA workshop in Warsaw (2008) and will be amplified at the CERN LC workshop This workshop (September 2010) is organized with CERN participation at parity in the program Committee This workshop (September 2010) is organized with CERN participation at parity in the program Committee If successful (heavy organization>400 expected large number of // sessions) could be generalized, on detectors, to the 2 other regions If successful (heavy organization>400 expected large number of // sessions) could be generalized, on detectors, to the 2 other regions F. Richard 11/27/0916

17. Conclusions There is rapid progress towards 2 realistic LC detectors confronting push-pull constraints New physics studies produced by the LoIs with detailed simulation/reconstruction and backgrounds studies confirm excellent LC performances on top and Higgs physics Overall LC strategy leaves open the final choice awaiting for first LHC results R&D on detectors is a priority and works well in Europe CLIC-ILC collaborations on detectors are rapidly developing on R&D and design of detectors for mutual benefits Next ECFA LC workshop will take place at CERN end of 2010 and should illustrate the good spirit of worldwide collaborations on the future LC F. Richard 11/27/0917

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20. F. Richard 11/27/0920 CLIC 3 TeV main parameters Center-of-mass energy CLIC conserv. CLIC Nominal Total (Peak 1%) luminosity1.5(0.73)10 34 5.9(2.0)·10 34 Repetition rate (Hz)50 Loaded accel. gradient MV/m100 Main linac RF frequency GHz12 (NC) Bunch charge10 9 3.72 Bunch separation ns0.5 Beam pulse duration (ns)156 Beam power/linac (MWatts)14 Hor./vert. norm. emitt (10 -6 /10 -9 )3 / 402.4 / 25 Hor/Vert FF focusing (mm)10/0.48/0.1 Hor./vert. IP beam size (nm)83 / 2.040 / 1.0 Soft Hadronic event at IP0.572.7 Coherent pairs/crossing at IP5 10 7 3.8 10 8 BDS length (km)2.75 Total site length (km)48.3 Wall plug to beam transfer eff.6.8% Total power consumption (MW)415

21. F. Richard 11/27/0921 LC 500 GeV Main parameters Center-of-mass energyILC CLIC Conserv. CLIC Nominal Total (Peak 1%) luminosity2.0(1.5)·10 34 0.9(0.6)·10 34 2.3(1.4)·10 34 Repetition rate (Hz)550 Loaded accel. gradient MV/m33.580 Main linac RF frequency GHz1.3 (SC)12 (NC) Bunch charge10 9 206.8 Bunch separation ns1760.5 Beam pulse duration (ns)1000177 Beam power/linac (MWatts)10.24.9 Hor./vert. norm. emitt (10 -6 /10 -9 )10/403 / 402.4 / 25 Hor/Vert FF focusing (mm)20/0.410/0.48/0.1 Hor./vert. IP beam size (nm)640/5.7248 / 5.7202/ 2.3 Soft Hadronic event at IP0.120.070.19 Coherent pairs/crossing at IP10?10100 BDS length (km)2.23 (1 TeV)1.87 Total site length (km)3113.0 Wall plug to beam transfer eff.9.4%7.5% Total power consumption MW216129.4

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