Roma, 2 febbraio ILC vs CLIC. .cosa si perde e cosa si guadagna. Barbara Mele. Sezione di Roma

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1 Roma, 2 febbraio 2006 ILC vs CLIC.cosa si perde e cosa si guadagna. Barbara Mele Sezione di Roma

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5 Luminosity vs Collision Energy 5

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11 Experimentation at CLIC: beamstrahlung becomes more severe x forward coverage x backgrounds x precision of scans x short bunch spacing (0.7 ns) challenges detector time resolution tree +ISR lineshape scan of a 3 TeV dilepton resonance at CLIC + beamstrahlung 11

12 Physics case for multi-tev e + e - at CLIC Physics highlights: 1. rare Higgs decays 2. improve on Higgs self coupling + extend mass range 3. more complete SUSY spectrum 4. extending mass reach new resonances, scans 5. study resonances of strong EWSB if within kinematic reach 12

13 Completion of the Higgs sector Larger cross 3 TeV : can measure rare decay modes H -> bb mh = 180 GeV mh = 120 GeV g/g = 4% g/g = 2% 13

14 Higgs self 3 TeV Advantage of larger rates in HHνν: * improve precision on λhhh for light H to ~10% or better (mh = 120 GeV) * sensitivity on λhhh for heavier H in WWWWνν to ~15% (mh = 240 GeV) M H = 240 GeV 180 GeV 140 GeV 120 GeV 11% 9% +Direct production of heavy H,A,H ± up to 1.2 TeV (at CLIC(3000)) 14

15 Constraining Triple-Gauge Coupling γ-ww at 0.8 TeV at 3 TeV 15

16 STRONG EWSB : WW Resonance 3 TeV Can establish its existence beyond any doubt if < 1 TeV: ee H ee Find resonance in strong WW scattering if > 1 TeV: ee H νν 16

17 If the Higgs and may find it in contact interactions! is light There must be new physics below 1000 TeV 17

18 Extrapolate to high energies: V ( H) = µ 2 H H 2 + λ H 4 Λ

19 SUSY at CLIC CLIC can reach higher mass SUSY particles : Dilepton spectrum in neutralino decay Smuons Neutralinos 19

20 Reach in the msugra parameter space 20

21 SUSY : LHC vs ILC and CLIC LHC almost `guaranteed to discover supersymmetry if it is relevant to the mass problem LC oberves complementary sparticles 21

22 Sparticle detectability along one WMAP line 22

23 CLIC could measure Kaluza-Klein excitations Angular distribution in graviton decay Direct-channel resonances 23

24 Process LHC LC SLHC CLIC 3, 5 TeV Squarks Physics Reaches of Various Colliders Sleptons New gauge boson Z Excited quark q* Excited lepton l* Two extra space dimensions Strong WLWL scattering 2σ - 4σ 70σ 90σ Triple-gauge C o u p l i n g ( T G C ) (95%) Scale of compositeness Integrated luminosities are 100 fb 1 for the LHC, 500 fb 1 for the 800 GeV LC, and 1000 fb 1 for the SLHC and CLIC. Most numbers given are TeV, but for strong WLWL scattering the numbers of standard deviations, and pure numbers for the triple gauge coupling (TGC)

25 summarizes discussion Open Symposium CERN Strategy Group 25

26 (Remember: Physics First ) 1. What is the physics case for upgrades or new machines if LHC provides a null result? 2. Clear statements (ECFA, ACFA, HEPAP, ICFA, GSF, ) in that a Linear Collider of up to at least 500 GeV, upgradeable to 1 TeV, should be the next major project and requires timely realization. Has the physics case changed since then? 3. Is there a clear physics case for multi-tev lepton colliders now? At which energy? 4. What is the physics case for SLHC/DLHC? Which priority? 5. Muon Collider: any physics reason to discuss it (already) now? 26

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28 Unanimous view: physics case has not changed since 2001 Physics case for 400 (500) GeV is solid (see ECFA statement) - Technology is at hand we are ready to go for it (GDE timescale)

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