Satoru Yamashita. (ICEPP, Univ. of Tokyo)

Transcription

1 Physics at International inear Collider Satoru Yamashita (ICEPP, Univ. of Tokyo)

2 S. Yamashita 1

3 S. Yamashita 2 ILC Z H ILC 500 GeV Higgs Factory Top quark Factory Dark Matter Factory(?) ILC 1 TeV Multi-Higgs, Top-Higgs SUSY/Graviton Factory(? Further Beyond(?)

4 A part of Examples of Physics research covered by ILC Mar S. Yamashita 3 1 st stage: Ecm =500 GeV (92, GeV changeable) Luminosity = > 500 / fb / several years. 2 nd stage: Ecm = 1 TeV

5 S. Yamashita 4 ILC LHC LHC ILC LHC ILC

6 S. Yamashita 5 Powerful Tools at ILC Electron/positron collision (elementary process) High Energy and High Luminosity Energy scan (controllable) Controllable beam polarization Very sensitive detectors & Trigger free Precise theoretical calculation (<1%) Precise physics information & long energy reach LHC gives us a new global (mixed) picture. ILC gives us new dynamic multi-dimensional total views.

7 S. Yamashita 6 Challenge in Detector R&D In order to accomplish our physics goal at ILC With respect to detectors at LHC: Inner VTX layer 3--6 times closer to IP VTX pixel size 1 / 30 VTX materials 1 / 30 Materials in Tracker 1 / 6 Track mom. resolution 1 / 10 EM cal granularity 1 / 200!! Parallel workshop for ILC detector R&D is running on 3/3-3/5

8 S. Yamashita 7 LHC & ILC LHC ILC

9 S. Yamashita 8 Sensitivity, Physics reach and precision Single production Higgs Extra-Dimension Pair production SUSY Heavy Higgs Intermediate state Extra-Dimension Strong EWSB Z, contact Int. LHC ~a few TeV dσ/σ > 10 % ~2-3 TeV (colored) ~several TeV resonance ILC ~ 1 TeV δσ/σ ~ 1% δ(dσ/dω) ~ 1% ~0.5 TeV (any type) δσ/σ ~ 1 % Energy scan, Beam pol >10 TeV δσ/σ ~ 1 % Energy scan, Beam pol Coupling, spin Loop effect A few % level effect

10 S. Yamashita 9 Examples: Reach and beyond Large Extra Dimension Reach Not only the reach! 15 TeV ILC w/ transverse polarization ILC LHC K.Odagiri 10 TeV M D Λ 5 TeV umbers are taken rom J.Hewett et al δn=2 δn=4 δn=6 Graviton emission Graviton exchange (virtual production) # of extra-dimensional space The size and number of the extra-space to be determined at ILC.

11 S. Yamashita 10 Everyone knows power of Precision LEP/SLC/Tevatron SU(3) c X SU(2) L X U(1) Gauge interaction 3 generations Higgs is light ( GeV for SM Higgs) SUSY GUT indication

12 S. Yamashita 11 Precision gives us a lot!

13 Very High precision at ILC δm W (MeV) δm top (GeV) δsin 2 θ eff 10 5 now ev Run LHC ILC(+GigaZ) Higgs ILC ACFA WG

14 S. Yamashita 13 Higgs Production 3 main production modes >10 5 Higgs for 500fb -1 Top Yukawa Production Higgs Self-coupling

15 S. Yamashita 14 ILC LHC Higgs signal H γγ ILC Higgs signal LHC Bkg. tth WbWbbb lνjjbbbb ATLAS 30fb -1 Bkg. ILC e+e- HZ production Typical numbers Tagging efficiency ~ % S/N > 1

16 S. Yamashita 15 Higgs Sector is unknown & Mysterious Electroweak fit at LEP/SLC/Tevatron tells At least one should exist below 300 GeV which couples to Z and W Almost NOTHING is known NOTHING is known for Yukawa-coupling NOTHING is known for self-coupling Single Higgs? Two Higgs field doublets? Additional singlet? Triplet? Fundamental Higgs SM Two Higgs field doublet Model (2HDM) type-i type-ii MSSM SUSY? Extra-dimension? Composite? Type-I? Type-II? Why top is so heavy? Special for 3rd generation? CP-violation in Higgs sector? More exotics? ation? 2HDM+singlet more general Exotic Composite Higgs NMSSM XMSSM fermiophobic invisible Technicolor = new interaction

17 S. Yamashita 16 LC Examples of Higgs odel Independent Analyses Energy scan Mass & Cross-section measurement =Gauge coupling measurement δg/g~1% δm h ~40MeV Γ W =f(m h )xσ Branching ration measurements Invisible width Use Recoil mass(no bias) Spin, Parity Beam polarization ZZh, WWh production (selectable) CP, SU(2) L xu(1) Total width measurement Absolute strength of Yukawa-Coupling determination Γ tot =Γ W /Br(H-->WW) Λ 2 f =C(M h ) x Br(H-->ff) x Γ tot δγ tot /Γ tot ~ 5 % δλ b /Λ b ~3%, δλ τ /Λ τ ~4%, δλ c /Λ c ~8%, δλ U /Λ U ~4%

18 S. Yamashita 17 Higgs potential = Origin of EW symmetry breaking For SM Higgs ACFA The first access to the Higgs potential through double Higgs-boson production. δλ/λ ~ % at 500 GeV δλ/λ ~ % at 1 TeV ACFA Higgs working group Grace

19 ILC Higgs Mechanism Higgs production Cross-section + Higgs boson Decay branching ratios Coupling-mass relation ILC SM t b c τ If one Higgs generate all masses Mar Model Independent Precise Determination Absolute strength of Gauge coupling, Yukawa coupling Self-coupling Mass-generation mechanism Different pattern if SUSY, Multi-Higgs etc.. S. Yamashita 18

20 S. Yamashita 19 Coupling Precision LHC 300 fb -1 x 2 M H GeV Deviation from SM value +30% +20% +10% 0%(SM) -10% -20% -30% Γ h τ b t W Z Model assumption

21 Coupling Precision ILC M H GeV Deviation from SM value +30% c τ b t W Z H +20% +10% 0%(SM) -10% -20% -30% Γ h Ecm=0.5 TeV 500 fb -1 Model Independent Analyses Mar S. Yamashita 20

22 Coupling Precision ILC M H GeV Deviation from SM value +30% c τ b t W Z H +20% +10% 0%(SM) -10% -20% -30% Γ h ILC 0.5 TeV ILC 0.5 TeV Model Independent Analyses Ecm=0.5 TeV + 1 TeV Mar S. Yamashita 21

23 S. Yamashita 22 SUSY or 2HDM ILC Deviation from SM value Γ h +30% c τ b t W Z H +20% cosα/sinβ +10% 0%(SM) -10% sin(α β) -20% sinα/cosβ Model Independent Analyses -30%

24 S. Yamashita 23 Deviation from SM value Extra-dimension (radion-higgs mixing) +30% c τ b t W Z H +20% +10% 0%(SM) -10% -20% Γ h ILC?? -30% Model Independent Analyses

25 Electroweak Baryogenesis (S.Kanemura, Y.Okada, E.Senaha 04) ILC Deviation from SM value Γ h +30% c τ b t W Z H +20% +10% 0%(SM) -10% -20% Model Independent Analyses -30% Mar S. Yamashita 24

26 More than one Higgs boson? h, H, A, H ± ILC 500 GeV in the Minimal Supersymmetric Standard Model. Accurate coupling measurements tell us M A Top mass is also essential Direct and indirect searches for heavy Higgs bosons at ILC. Mar S. Yamashita 25

27 Heavy Higgs (A 0, H 0, H +- ) Discovery Reach Mar ILC 1TeV S. Yamashita 26 tanβ LHC Mhmax scinario tanβ SUSY Grace ILC 10 Only h 0 discovery Excluded by LEP ACFA Higgs working group M A (GeV) Discovery reach depends on tanβ and model Good at large tanβ case Full discovery in many channels independent of tanβ Reach up to ~ beam energy If measured mass at ILC/LHC predicted mass by ILC Beyond MSSM, beyond 2HDM!

28 Photon-photon collider option at ILC Laser e - beam γ γ a few mm ILC 1TeV Discovery Mode for Heavier Higgs Discovery reach up to ~800 GeV CP mixing in Higgs sector Gamma decay width of light Higgs γ γ H/A Mar S. Yamashita 27

29 S. Yamashita 28 SUSY & Beyond

30 S. Yamashita 29 LHC would discover SUSY or missing-energy phenomena quickly by ~2009, however 1. Complicated cascade chain 2. Large SM and other SUSY backgrounds 3. Model dependence of new physics analyses ATLAS 100 fb -1 m () end-point precision ~0.3% m (j) max threshold precision ~2 % ATLAS 100 fb -1 multiple hypotheses, distinguished by different spin and energy flows, difficult to distinguish at LHC (M.Peskin, Victoria, 2004) conventional SUSY sneutrino LSP (Murayama et bosonic supersymmetry (Cheng, Matchev, Schmaltz)

31 S. Yamashita 30 SUSY at ILC Huge research area at ILC measure sparticle properties (masses, cross sections, J PC, coupling strength, chirality, mixing) use these + LHC to determine underlying SUSY model and SUSY breaking mechanism extrapolate to GUT scale using RGEs to detemine SUSY GUT mechanism Full investigation at ILC 1 TeV

32 S. Yamashita 31 Sparticle discoveries J.Ellis et al

33 S. Yamashita 32 Cosmology: Dark Matter = LSP?! WMAP.094 < Ω h 2 <.128 (2 sigma) WMAP LHC Planck ILC 7 % ~15 % ~2 % ~3 %

34 S. Yamashita 33 1st step of SUSY at ILC eg.) Smuon production and decay Discovery of SUSY principle ~χ 0 Selectron production ACFA WG Spin, CP, coupling strength, etc.. precisely measure

35 S. Yamashita 34 2nd step of SUSY at ILC Discovery of a new principle GUT Discovery of M1-M2 gaugino Grand Unification ACFA WG mass coupling chirality Mixing From selectron and chargino productions

36 S. Yamashita 35 Using the M(χ 0 1) from ILC 300 fb M values in GeV (ILC input) Scalar lepton mass (GeV) ILC+LHC ILC LHC Lightest neutralino mass (GeV) Significant improvements even if only m(χ 0 ) is measured at ILC Strong correlation at LHC An input from ILC resolve this correlation

37 S. Yamashita 36 Evolution of scalar fermion mass parameters LHC LHC LC G.A.Blair, W.Porod,and P.M.Zerwas

38 Example 1) Pin down physics models Discrimination between different SUSY-breaking scenarios ype-i string inspired models U: early unification at GeV UT: string scale at GUT scale ~10 16 GeV irage: Intermediate string scale at GeV + Mirage unification Allanach, Grellscheid, Quevedo SPS1a ILC+LH LHC alone Mar S. Yamashita 37

39 S. Yamashita 38 Determining SUSY breaking mechanism LHC+ILC Combined analysis SUSY breaking scenario SUSY particle masses Super Gravity (msugra) Energy scale Gauge Mediation G.A.Blair, W.Porod,and P.M.Zerwas

40 S. Yamashita 39 Flavor Violation in SUSY sector e.g) SUSY-Seesaw model ILC Ecm=800 GeV T.Hurth, W.Porod et at. msugra points C B G I

41 S. Yamashita 40 Extra Dimensions Inspired by superstring theory, a scenario with large extradimension is proposed. graviton ark, lepton, uge boson Quarks, leptons, and gauge bosons live in a 3-dimensional wall. Gravity can propagate in 3+n dimensional space. Studio R

42 S. Yamashita 41 Search for extra-space at ILC K.Odagiri Graviton emission to extra-space f G Graviton exchange f # of extra-dimensional space The size and number of the extraspace may be determined at LC.

43 Final Goal of Physics at ILC together with LHC Mar S. Yamashita 42 Unexpected New World! Elucidate Mystery of VACUUM Higgs Vacuum structure Origin of Mass Dark Energy GUT Quantum Gravity Super String Origin of UNIVERSE Ultimate Theo New Principles Space-time Structure SUSY Dark Matter 5th-Dimension, Extra-Dimension Super Gravity CP-Violation in top/higgs/susy Brane world

44 Goals of ILC 1. Elucidate the mystery of Electroweak symmetry breaking, Vacuum structure and mass-generation 2. Direct signals for new physics (SUSY, extradimensions, Z ) and determine The Physics 3. GUT and Planck scale physics 4. Unexpected new signals Discovery of New Physics Principle Determine THE Physics Model Discovery at Linear Collider Change the paradigm Mar S. Yamashita 43

45 S. Yamashita 44 Requests to Theorists 1. Please give any kind of new ideas on: New Physics models New mode/channels in known models Exotic signals Global methods to combine with Tevatron/LHC, B-factories, Neutrino results etc.. Analysis methods 2. Please consider any connection to cosmology Dark matter Dark energy Baryogenesis, 3. Please give ultra-precise calculation to measure 0.1 % prediction in production and decay branch Multi-loop effects correction,

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47 RESERVE Mar S. Yamashita 46

48 S. Yamashita 47 if no Higgs is found? t A generic feature h? b little Higgs technicolor Heavy s-channel resonance in < 5 TeV range (new gauge bosons, technipions, KK resonances, ) e ν W L e Z f e Z W e ν W L e f e W

49 S. Yamashita 48 ν W L sensitivity to new heavy resonances in ee ννww ν W L Barklow et al, LHCLC report ILC LHC assume a 1 =1 M = 1.9 TeV SM couplings (a=1) ILC: 500 GeV, 500 fb -1 ILC is very sensitive to ννww, ννzz

50 S. Yamashita 49 New Gauge Bosons e Z f e Z W e f e W LHC+ILC Mz < 4.5TeV Bourlikov, Godfrey, Hewett, Richard, Riemann, Rizzo Z Mass Reach ILC LHC Z models Richard 2003 Determine Z model

51 S. Yamashita 50 LHC = Gluino factory Large production cross section 200 events/day at 2x10 33 for m(q,g)~1tev ATLAS 5σ discovery curves ~ 100 days : up to 2.3 TeV ~ 10 days : up to 2 TeV ~ 1 day : up to 1.5 TeV Signature = Large Missing E T Cascade decay of gluino, Scalar quarks Discovery of such Phenomena: by 2009

52 S. Yamashita 51 Coupling unification at GUT scale SUSY mass spectrum From ILC & LHC α s 0.003(now) ---> (ILC) Allanach, Blair, Kraml, Martyn, Polesello, Porod,,Zerwas

53 Extrapolation to physics at high scales S. Yamashita 52 Evolution of M1, M2, M3 gaugino mass LHC LHC LC Blair et al. G.A.Blair, W.Porod,and P.M.Zerwas

54 S. Yamashita 53

55 S. Yamashita 54 Performance Goal of ILC Detectors VXT Impact Parameter resolution: < 5µm + 10µm / p(gev) sin -3/2 θ Tracker Momentum resolution: dp/p < 5 x 10-5 x p(gev) (central region) 3 x 10-4 x p(gev) for forward region Angular resolution: dθ < 2 x 10-5 rad (for cosθ <0.99) Jet energy resolution: de/e < 0.3 / E(GeV) Excellent Hermeticity: down to θ < mrad (active mask)

56 Higgs coupling measurements at LHC Ratio can be obtained using events with similar topology Michael Duhrssen et al. `04 (hep-ph/ ) Using moderate model assumption Model Assumed For Mh GeV δλ τ / Λ τ 15 % δλ b / Λ b > 20 % Mainly from tth process δλ top / Λ top % Mar S. Yamashita 55

57 S. Yamashita 56 SUSY List LHC ILC