Overview of LC Physics and Detector Requirements Satoru Yamashita - PowerPoint PPT Presentation

Overview of LC Physics and Detector Requirements Satoru Yamashita (ICEPP, Univ. of Tokyo) Nov. 9, 2004, ACFA LCWS@Taipei

Many materials from  ACFA LC report (2001)  TESLA TDR (2001)  LC physics resource book for Snowmass (2001)  GLC Project (2003)  Linear collider report from WWS (2003)  LHC-LC note (G.Weiglein et al. 2004)  Response to ITRP questions (2004)  Many from LHC, LC related workshops  … … … Many thanks to all 1 S. Yamashita, 7th ACFA WS Nov.9 2004

A part of Examples of Physics research covered by ILC 1 st stage: Ecm =210 -500 GeV, Luminosity = ~ 200 - 500 / fb / year x several years . 2 nd stage: Ecm = 1 TeV Nov.9 2004 S. Yamashita, 7th ACFA WS 2

Goals of ILC 1. “Unexpected” new signals 2. Electroweak symmetry breaking and mass- generation 3. Direct signals for new physics (SUSY, extra- dimensions, Z’…) and determine The Physics 4. GUT and Planck scale physics Nov.9 2004 S. Yamashita, 7th ACFA WS 3

Murayama LP03 4 S. Yamashita, 7th ACFA WS Nov.9 2004

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. 5 S. Yamashita, 7th ACFA WS Nov.9 2004

Signal and background Cross-section LHC Number of events / 500 fb -1 σ (fb) ILC 6 S. Yamashita, 7th ACFA WS Nov.9 2004

Detector Requirements The best summarized in World-wide “ Linear Collider Detector R&D ” J.Brau, C.Damerell, G.Fisk, Y.Fujii, R.Heuer, H.Park, K.Riles, R.Settles, H.Yamamoto Complete document is available from http://blueox.uoregon.edu/~lc/randd.ps (.pdf) 7 S. Yamashita, 7th ACFA WS Nov.9 2004

Performance Goal of ILC Detectors ■ VXT Impact Parameter resolution: < 5 µ m + 10 µ m / 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: d θ < 2 x 10 -5 rad (for |cos θ |<0.99) ■ Jet energy resolution: dE/E < 0.3 / √ E(GeV) ■ Excellent Hermeticity: down to θ < 5--10 mrad (active mask) Nov.9 2004 S. Yamashita, 7th ACFA WS 8

Challenge 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 !! Nov.9 2004 S. Yamashita, 7th ACFA WS 9

Most of physics needs information from all sub-detectors In most cases, physics sensitivity is determined by how well the sub-detectors are combined and optimized as a single detector , rather than how well each sub-detector works. How to combine and optimize the total performance of detector “ Detector concept ” is essential Next 3 talks Nov.9 2004 S. Yamashita, 7th ACFA WS 10

To accomplish the detector optimization and comparison in the most effective way: Need ■ Common (for ALL “ concepts ” ) Physics Benchmarks ■ Physics models ■ Particle properties (mass..) and decay Br ■ Energy and luminosity points Choose different type of event topologies ■ Common sets of Event generators ■ Common Simulation platform(s) -- simulators/data format ■ Common archive for Analyses Tools ■ Common data archive Very good starting points: Snowmas points , Le Houche accord , etc.. It ’ s time for “ Taipei points / scheme ” for ILC Nov.9 2004 S. Yamashita, 7th ACFA WS 11

Back to ILC physics Introduction Higgs, SUSY, etc.. Nov.9 2004 S. Yamashita, 7th ACFA WS 12

Sensitivity, Physics reach and precision LHC ILC Single production ~ 1 TeV ~a few TeV Higgs δσ / σ ~ 1% δσ Extra-Dimension ds/s > 10 % δ ( d σ / d Ω ) ~ 1% ~0.5 TeV (any type) Pair production ~2-3 TeV (colored) δσ / σ ~ 1 % δσ SUSY Energy scan, Beam pol Heavy Higgs >10 TeV Intermediate state ~several TeV δσ / σ ~ 1 % Extra-Dimension resonance Strong EWSB Energy scan, Beam pol Z’, contact Int. Coupling, spin Loop effect A few % level effect 13 S. Yamashita, 7th ACFA WS Nov.9 2004

Examples: Reach and beyond Not only the reach ! Large Extra Dimension Reach K.Odagiri ILC w/ transverse polarization ILC 15 TeV Energy Scale LHC M D 10 TeV Λ 5 TeV δ n=2 δ n=4 δ n=6 Graviton exchange # of extra-dimensional space (virtual production) Graviton emission Numbers are taken The size and number of From J.Hewett et al the extra-space to be determined at ILC. 14 S. Yamashita, 7th ACFA WS Nov.9 2004

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 (114-260 GeV for SM Higgs) SUSY GUT indication 15 S. Yamashita, 7th ACFA WS Nov.9 2004

Precision gives us a lot! 16 S. Yamashita, 7th ACFA WS Nov.9 2004

Very High precision at ILC δ m W (MeV) δ m top (GeV) δ sin 2 θ eff × 10 5 now 34 3.9 17 TeV Run 2 16 1.4 29 LHC 15 1-2 14-20 ILC (+GigaZ) 7 0.1 1.3 ILC ACFA WG

First Step = Higgs • Higgs is – Spin 0 (elementary?) particle – very sensitive to Physics between O(100GeV) to GUT/Planck scale • Structure and coupling of Higgs sector are keys to – Origin of mass and spectrum of particle masses – Vacuum structure of Universe – Physics between O(100GeV) to GUT scale – SUSY structure and spectrum – Electroweak Baryogenesis Nov.9 2004 S. Yamashita, 7th ACFA WS 18

Higgs Mechanism If one Higgs generate all masses Coupling-mass relation ILC t The Higgs vacuum- expectation -value m v = × κ i i b c Higgs coupling constant τ Particle mass SM Higgs boson branching ratios Different pattern If SUSY, Multi-Higgs etc.. Top Yukawa coupling Mass-generation Higgs Self-coupling mechanism 19 S. Yamashita, 7th ACFA WS Nov.9 2004

Higgs Sector is unknown Electroweak fit at LEP/SLC/Tevatron tells Fundamental Higgs At least one should exist below 300 GeV which couples to Z and W SM Almost NOTHING is known At least one should exist below <300 GeV Two Higgs field doublet Model ■ NOTHING is known for Yukawa-coupling (2HDM) ■ NOTHING is known for self-coupling type-I ■ Single Higgs? Two Higgs field doublets? ■ Additional singlet? Triplet? MSSM type-II ■ SUSY? Extra-dimension? 2HDM+singlet NMSSM ■ Composite? more general ■ Type-I? Type-II? XMSSM Exotic fermiophobic ■ Why top is so heavy? Special for 3rd generation? invisible Why top is so heavy? Special for 3rd generation? ■ CP-violation in Higgs sector? Composite Higgs Technicolor ■ More exotics? = new interaction 20 S. Yamashita, 7th ACFA WS Nov.9 2004

LHC Higgs signal ILC Higgs signal H →γγ Bkg. ILC （ e+e- → HZ production ） ttH → WbWbbb → l ν jjbbbb Typical numbers Tagging efficiency ATLAS ~ 30-50 % 30fb -1 S/N > 1 Bkg. 21 S. Yamashita, 7th ACFA WS Nov.9 2004

3 main production modes >10 5 Higgs for 500fb -1 ILC ILC LHC 22 S. Yamashita, 7th ACFA WS Nov.9 2004

Higgs coupling measurements at LHC Ratio can be obtained using events with “ similar ” topology Using moderate Michael Duhrssen et al. `04 (hep-ph/0406323) model assumption Model Assumed For Mh 115-150 GeV δΛ τ / Λ τ ∼ 15 % δΛ b / Λ b > 20 % Mainly from ttH process δΛ top / Λ top ∼ 15 − 20 % Γ tot is unknown.. Absolute strength is difficult to measure 23 S. Yamashita, 7th ACFA WS Nov.9 2004

ILC Examples of Higgs Mass & Cross-section measurement Model Independent Analyses Γ W = f ( M h ) x σ = Gauge coupling measurement δ g/g ~1% δ M h ~40MeV Energy scan Branching ration measurements Invisible width Use Recoil mass(no bias) Spin, Parity Beam polarization Absolute strength of Total width measurement Yukawa-Coupling determination Γ tot = Γ W / Br (H-->WW) 2 = C (M h ) x Br (H-->ff) x Γ tot Λ f ZZh, WWh production δΛ b / Λ b ~3%, δΛ δΛ τ / Λ τ ~4%, δΓ tot / Γ tot ~ 5 % (selectable) δΓ δΛ δΛ c / Λ c ~8%, δΛ δΛ U / Λ U ~4% δΛ CP, SU(2) L xU(1) 24 S. Yamashita, 7th ACFA WS Nov.9 2004

Higgs potential = Origin of EW symmetry breaking For SM Higgs ACFA The first access to the Higgs potential through double Higgs-boson production. Grace Grace ACFA Higgs working group δΛ / Λ ~ 10 - 15 % 25 S. Yamashita, 7th ACFA WS Nov.9 2004

LHC 300 fb -1 x 2 Coupling Precision τ b t W Z Γ h +30% Deviation from SM value +20% +10% 0%(SM) -10% -20% Model assumption -30% 26 S. Yamashita, 7th ACFA WS Nov.9 2004

ILC Coupling Precision c τ b t W Z H Γ h +30% Deviation from SM value +20% +10% 0%(SM) -10% -20% Model Independent Analyses -30% 27 S. Yamashita, 7th ACFA WS Nov.9 2004

ILC SUSY or 2HDM c τ b t W Z H Γ h +30% Deviation from SM value +20% cos α /sin β +10% 0%(SM) sin( α−β ) -10% sin α /cos β -20% Model Independent Analyses -30% 28 S. Yamashita, 7th ACFA WS Nov.9 2004

Extra-dimension ILC (radion-Higgs mixing) c τ b t W Z H Γ h +30% Deviation from SM value +20% +10% 0%(SM) ?? -10% -20% -30% Model Independent Analyses 29 S. Yamashita, 7th ACFA WS Nov.9 2004