ATLAS Higgs and Supersymmetry Physics Prospects at the High-Luminosity LHC. N. Venturi (CERN) On behalf of the ATLAS Collabora;on EPS 2017

Transcription

1 ATLAS Higgs and Supersymmetry Physics Prospects at the High-Luminosity LHC N. Venturi (CERN) On behalf of the ATLAS Collabora;on EPS 2017

2 Outline The High Luminosity-LHC program ATLAS Phase II Upgrade program Higgs analysis prospect: - Higgs boson coupling - Higgs boson self-coupling - Higgs boson rare decays - VBF Higgs boson produc;on Supersymmetry (SUSY) analysis prospect: - Stop pair direct produc;on - Stau pair direct produc;on - Chargino and neutralino direct produc;on Conclusion 6/30/17 2

3 HL-LHC program hcp://hilumilhc.web.cern.ch/about/hl-lhc-project NOW 13 TeV <μ PU > -> 20 <μ PU > ~ 23 PHASE 2 ATLAS UPGRADE HL-LHC mode Peak Luminosity (cm -2 s -1 ) Mean number of interactions per bunch-crossing <m PU > Integrated luminosity (fb -1 ) Baseline 5x Ultimate 7.5x /30/17 3

4 ATLAS Phase II Upgrade Program ( ) ATLAS Phase II upgrade: for performance and degrada;on/limita;on -> maximize the physics performance and discovery poten;al of ATLAS - increased pile-up - higher backgrounds - higher trigger rates -> Physics targets : precision measurements /rare decays / beyond SM Longer latency for Trigger System Upgrade electronics for Tile Calorimeter Inner detector with fully Silicon (strip and pixel) up to η = 4 New Inner Muon barrel trigger chambers Op;ons for: - forward muon tagger - ;ming detectors 7/4/17 4

5 Higgs Couplings Extrapola;on from Run-1 analysis at <μ PU > = 140 (ATL-PHYS-PUB ) Run-1 μ yy = (Δμ/μ ~ 0.23) μ ZZ = (Δμ/μ ~ 0.24) μ WW = (Δμ/μ ~ 0.33) Signal Strength μ = σ/σ SM With 3000 _ -1: W, Z couplings to 3% Muon coupling to 7% t,b,τ couplings to 8-12% 7/3/17 5

6 Higgs Self-coupling First opportunity to measure Higgs boson trilinear self-coupling σ NNLO (HH) ~ 40 _ -> combine as many decay channels as possible Decay channel Branching ratio (%) s.br (fb) bb+bb bb+w + W bb+t + t W + W - +t + t ZZ+bb ZZ+W + W bb+gg gg+gg λ HHH Decay channels with b-jets have higher branching ra;os 6/30/17 6 Light-jet rejection MV1 + (ATL-TDR-025 LHCC ) ATLAS Simulation s = 14 TeV, <µ>=200, tt η < < η <4 Run 2, η < b-jet efficiency Comparable light jets rejec;on: with <μ> = 200 and Run-2

7 - HH -> bb γγ HH -> bb bb Higgs self-coupling Cut based analysis, ATLAS upgrade design y performance SR: 9.5 signal, 91 total background Figure 7: Expected 95% C.L. upper limit on the cross-section HH! b bb b / SM, as a function of the minimum jet p T required of the four Higgs boson candidate constituent jets. - - Z 0 : 1.05 σ (+/ stat only) -0.8 < λ HHH /λ SM < 7.7 (95% C.L., no syst.) m γγ assuming that systematic uncertainties are negligible, 3.4 < HHH / SM systematic uncertainties are used, 7.4 < HHH / SM HHH < 14. HHH < 12, while if current Extrapola;on from Run-2 analysis Systema;c as in 2016 (i-bar, mul;-jets bckg modeling) Present exclusion limit : μ = HH! b bb b σ/σ / SM and SM = HHH 29 / SM Table 2 summarises the various extrapolations made under di erent assumptions presented above. Table 2: Summary of the constraints on HHH extrapolated to 3000 fb 1 under various assumptions. Jet Threshold Background / SM HHH / SM HHH HHH/ SM HHH [GeV] Systematics 95% Exclusion Lower Limit Upper Limit 30 GeV Negligible GeV Current GeV Negligible GeV Current ATL-PHYS-PUB ATL-PHYS-PUB m 4j CHH->WbWb bbbb HH-> bb τ - τ + ATL-PHYS-PUB ATL-PHYS-PUB > BACK-UP 7/3/17 7

8 Higgs rare decays H -> J/Ψ (->μ + μ) - γ (with <μ PU >=140, L = 3000 _ -1 ) Higgs coupling to c-quark. Run-1 detector performances MVA analysis m μ+μ- γ in [115, 135] GeV 3 signal events and 1700 background (with no systema;cs) BR (H -> J/Ψ (->μμ) γ ): x -6 (95% C.L.) SM: 2.9 ±0.2 x -6 ( Run-1 Limit: 1.5 x -3 ) (ATL-PHYS-PUB ) m(μ + μ - γ) H -> μ + μ - ( with <μ PU >=200, L = 300/3000 _ -1 ) Low BR, high Z/γ * background, high mass resolu;on Based on Run-1 analysis (cut op;m.), m μ+μ- in [1, 160] GeV] Total background shape and normaliza;on data-driven ITK-Upgrade -> improve mass resoluron by 25% (w.r.t Run-2) Z 0 : 2.3σ (300 q -1 ) 7.0σ (3000 q -1 ) Δμ/μ: 46% (300 q -1 ) 21% (3000 q -1 ) (ATL-TDR-025 LHCC ) m µµ [GeV] 7/3/17 8 Events/2.0 GeV ATLAS Simulation s=14 TeV, 3000 fb -1, <μ> = 200 H µµ (ggf+vbf) WW+tt+Z/γ* WW+tt WW

9 VBF Higgs produc;on Pile-up suppression: - <μ PU > ~ pu jets/event - R PT based on charged vertex frac;on H -> WW * -> eν μν ATLAS performances: Run-1 (e/μ) Jets and E T Miss from expected upgrade performance Experimental systema;c (no theo. syst. on signal) H -> ZZ * -> 4l 2 jets( m(jj) > 130 GeV), Main background ggf (separated via BDT) and qqzz Systema;c only from signal QCD scale (ATL-TDR-025 LHCC ) - Applied to all non b-tagged jets with: p T < 0 GeV and η <3.8 No PU mirgaron Rejecron factor 50 vs Pile-Up mirgaron ~0.1 pu jets/event! ios, theoretical uncertainties σ( onh Higgs ->WW*) boson prod Tracking coverage Expected precision h < % h < % h < % stat stat+syst Z 0 : Δμ: /5/17 9

10 Supersymmetry Searches at HL-LHC Supersymmetry (SUSY) is one possible extension of the SM: - predicts bosonic/fermionic partner for exis;ng fermion/bosons -> lightest SUSY par;cle is stable (if R-parity conserva;on) -> DM candidate -> Cancel out quadra;c divergences in the Higgs mass correc;ons -> Can accommodate the gauge coupling unifica;on Focus on HL-LHC benchmark studies: - 14 TeV, <μ PU > = 200, total integrated luminosity of 3000 _ -1 - smearing func;on for upgraded ATLAS detector simula;on - truth level par;cle corrected for detector effects - assume 30% systema;c on background 6/30/17

11 Stop pair direct produc;on Cut based analysis, top decaying leptonically Small mass spliyng among stop and neutralino -> ISR jets to boost the stop-system Final state with 2b-jets, isolated leptons and E T Miss Profile-likelihood-ra;o test sta;s;cs for expected exclusions Run-1 exclusion: [m t, 191] U [230, 380] GeV 3000 q -1 BR=1 ΔM(t ~, ~ χ 0 1 ) = 173 GeV ATL-PHYS-PUB q -1 Discovery up to 480 GeV Exclusion up to 700 GeV 6/30/17 11

12 Stau pair direct produc;on Extend the ATLAS exclusion scenario of combined ~ τ L ~ τ L and ~ τ R ~ τ R produc;on with χ~ 0 1 massless Cut based analysis: tau decaying hadronically, large E T Miss, low jet ac;vity Main background: W+jets and i-bar 5σ discovery sensirvity (χ~ 0 1 massless): ~ ~ ~ ~ ~ GeV in τ-mass for (τ L τ L and τ R τ R ) combined produc;on ~ ~ GeV for pure τ L τ L Exclusion limit (χ ~ 0 1 massless): ~ ~ ~ ~ ~ GeV in τ-mass for (τ L τ L and τ R τ R ) combined produc;on ~ ~ GeV for pure τ L τ L GeV for pure ~ τ R ~ τ R (Run-1: 9 GeV) For stau mass of 200 GeV: σ(τ~ L τ~ L ) ~0.02 pb σ(τ~ R ~ τ R ) ~0.01 pb ATL-PHYS-PUB /3/17 12

13 Direct chargino and neutralino Extend the present ATLAS sensi;vity to electro-weakinos mass range O(0 GeV) Simplified model: ~ ~ produc;on - χ ± 1 χ 2 0 are wino-like and with equal mass - sleptons and sneutrino with high mass, SM Higgs Cut based and MVA analysis Main background: i-bar ~ ~ σ NLO (χ ± 1 χ 20 ) ~0.005 pb (@ 500GeV) ATL-PHYS-PUB BR=1 BR=1 5σ discovery sensirvity : 950 GeV in mass χ ~ ± 1 χ ~ 2 0 for m(χ~ ) =0 <μ PU > = 140 Exclusion limit: GeV in mass χ ~ ± ~ 1 χ 0 2 for m(χ~ ) =0 MVA improvement 7/6/17 13

14 Conclusions HL-LHC will represent a challenging environment for ATLAS: -> <μ PU > = 200, large backgrounds, high radia;on dose Higgs and SUSY physics program will benefit greatly from HL-LHC data and ATLAS Phase II Upgrade -> Can explore the HH produc;on mechanism -> Precise measurements of Higgs couplings -> Can extend the present sensi;vi;es to heavy SUSY par;cles greatly The current expected ATLAS precisions at HL-LHC are s;ll preliminary -> Beier analysis techniques, beier data-driven methods for background -> Theore;cal uncertain;es expected to decrease with ;me 6/30/17 14

15 BACK UP 6/30/17 15

16 Summary of Higgs results at HL-LHC Channels Result HH final State Significance Coupling limit VBF H->WW * Δμ/μ 14 to 20% HH bb γγ (stat) VBF H->ZZ* Δμ/μ 15 to 18% HH bb τ + τ - ih, H->γγ (stat+syst) Δμ/μ 17 to 20% HH -> bbbb (stat+syst) 1.05 σ -0.8 < λ HHH /λ SM < σ -4.0 < λ HHH /λ SM < < λ HHH /λ SM <11.0 VH, H γγ Δμ/μ~ 25 to 35% ihh, HH bbbb 0.35 σ -- H-> Zy Δμ/μ ~ 30% H->μ + μ - Δμ/μ ~ 15% H-> J/ψ y BR < 44 x 95 % C.L. H ZZ* 4l (m(4l)>220 GeV ) Γ H = MeV (stat.+syst.) Run-1: Γ H < 22.7 MeV 6/30/ ATL-PHYS-PUB

17 Higgs self-coupling: 3000 _ CHH->WbWb bbbb with <μ PU > = 200 σ(ihh) ~ 1 _ Cut based analysis, Final State: HH->bbbb i->bblνqq Signal Region ( 5 b jets): 25 signal, 70 background (dominated by c-jets mis-tagged as b-jets) Significance: ~ 0.35 σ (no systemarcs) -> small contriburon - HH-> bb τ - τ + with <μ PU > = 140 Different triggers/cuts for τ had τ hah resp. τ had τ lep channels Constraint on m(bb) and m(ττ) Systema;c: 2% lumi., 3% for major bckg (Z+jets, i-bar) Combined channels yields: Signal: 48 Bckg.: 78 Significance: ~ 0.60 σ ( with syst.) -4 < λ HHH /λ SM < 12 (95% C.L. with syst) ATL-PHYS-PUB ATL-PHYS-PUB x σ(hh->bbτ - τ + ) (95% C.L.) 6/30/17 17

18 ATLAS HL-LHC Analysis Strategy Two approaches to study the HL-LHC physics performance with ATLAS Use of smearing func;ons: - Study detector performances for phys. objects (e,mu,..) with full MC simula;ons - Apply smearing func;ons to truth distribu;ons for analysis, overlay PU jets Extrapola;on of Run-1/Run-2 results - similar detector performance and analysis approach as Run-1/Run-2 - Scale signal and background level to higher luminosity, c.o.m. energy Systema;cs (will have ~x more higgs at HL-LHC than at the end of Run-2) - Theore;cal: from Run1/Run2 - Experimental: scaled to best guess for ATLAS upgraded detector at HL-LHC 6/30/17 18

19 Pile-up II: Photons Hard-Scattered/Pile-up Hard-Scattered/Pile-up jetjet g g PU>=200 ATL-PHYS-PUB <m<m PU>=200 ATL-PHYS-PUB ATL-PHYS-PUB Detector performances Photon identification Jet b-tagging HardScattered Scatteredjetjet Hard b bγ ATL-PHYS-PUB h < 2.37 tt ( 1 lepton) VBF H gg h < 2.7 Run-2 MV1 tagger Pile-up gγ g Pile-up More details in N. Calace's talk For combined average Hard-scatter jet g For 70% b-jet efficiency: fake rate : Light-jet rejection~300 for <mpu>=200 efficiency of 70% for isolated photons: (380 at Run-2) - Rejec;on factor of ~4000 for hard-scaiered jets S. Jézéquel, DIS Rejec;on factor S. Jézéquel, DIS 2017 of ~14000 for pile-up jets 6/30/17 S. Jézéquel, DIS

20 ATLAS Upgrade Performances Expected detector performances : electrons Pile-up jet rejection ATL-PHYS-PUB Light-jet rejection CERN-LHCC Z ee ATL-PHYS-PUB ATL-PHYS-PUB ATLAS Simulation Preliminary HL-LHC ITk LoI tt 3 <µ>=140 <µ>=200 <mpu>=200 2 Pile-up b pt GeV : 3-4% energy resolution S. Jézéquel, DIS <mpu >= b-jet efficiency Figure 6: The light-flavour jet rejection vs the b-tagging efficiency for the MV1 b-tagging algorithm in various scenarios for jets with pt > 20 GeV and < matched to any hard-scattering generator-level jet with p > 4 GeV within R = 0.6. These jets are not For an electron iden;fica;on efficiency of 69%, a jet rejec;on factor of about 4000 is obtained. assigned any particular flavour. Also, an electron charge mis-iden;fica;on of about 0.26% has evaluated for the first ;me The performance of b-jet identification is evaluated for two pile-up scenarios (hµibeen = 140 and hµi = 200) T and two operating points corresponding to average b-tagging efficiencies h" b i of 0.70 and 0.85 evaluated on t t events for b-jets with pt > 20 GeV and < 2.7. Fig. 6 shows the light jet rejection (the inverse of mis-tag rate) as a function of thes.b-tagging efficiency for the mentioned scenarios. A degradation is Jézéquel, DIS 2017 observed as the pile-up level increases, but the degradation is much smaller than in earlier studies [2]. For comparison, the best b-tagging algorithm in Run-2 was optimized to have a light jet rejection [17] of 380 and 33 at 70% and 85%, respectively. For 70% b-jet efficiency (with MV1 tagger): 28 - light jet rejec;on of ~380 with <mu> = 200 (best op;mized Run-2 b-tagger has 380 at 70% eff.) The b-, c-, light, and pile-up jet tagging efficiencies are parameterised as functions of jet p and for Muon with Pt < 200 GeV greatly benenfit from Itk momentum resolu;on performing parametric simulation studies as described in the introduction. As the statistics of Monte T Carlo samples used to derive the efficiencies is limited, two-dimensional fits have been performed and the 0 - Bs0 mass resolu;on in the μ will improve by inafig. factor oftestsabout 1.65 (1.5) fit functions are B provided ensure smooth dependencies, as shown 7. Closure are performed s toμ+ to verify there is good agreement between the fit functions and the actual binned efficiencies. in the barrel (end-cap) region 6/30/17 6. Muon Performance Results 20

21 Pile-up suppression Typical jet selec;ons require pt (jet) >30 GeV, η(jet) < 3.8 With <μ PU > = 200 expected 4.8 pileup jets with pt >30 GeV, η <3.8 per event Pile-up suppression with a parametrized track-confirmaron requirement Applied to all non b-tagged jets with pt < 0 GeV and η <3.8 Analyses typically use factor 50 rejecron -> ~0.2 pile-up jet per event -> % efficiency on hard-scaier jets CERNLHCC /30/17 21

22 ATLAS ITK Mass Resolu;on A.U ITk Upgrade (μ =200) Run-2 Detector (μ = 23) Run-2 Detector Mean ± 0.0 Sigma ± (ATL-TDR-025 LHCC ) ATLAS Simulation Mean Sigma ITk Upgrade ± ± m μμ [GeV] Figure 4.38: Signal resolution for H! µµ signal events, the Run 2 resolution is compared to the HL-LHC with pile-up conditions corresponding to hµi =200. 6/30/17 22

23 ATLAS Running Condi;ons High particle density High integrated radiation dose Inner tracker Detector requirements to maximize benefits from high int. luminosity: Replace detector not sustaining integrated radiation dose Minimize pile-up effect (high granularity, fast timing) Higher trigger acceptance and event rate Improve or maintain current detector performances 6/30/17 23

24 ATLAS Simulation Preliminary 2HDM Type I Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. ATLAS Simulation Preliminary 2HDM Type II Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. h γ γ,zz*,ww* h Zγ,µµ,ττ,bb tan β tan β Higgs BSM constraints Combined Combined h γ γ,zz*,ww* h Zγ,µµ,ττ,bb BSM Higgs constraints from ECFA ATL-PHYS-PUB ATL-PHYS-PUB cos(β-α) 300, fb 1 cos(β-α) <µpu> = 140 (a) Type I 2HDM Type II h γ γ,zz*,ww* h Zγ,µµ,ττ,bb ATLAS Simulation Preliminary Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. Combined h γ γ,zz*,ww* h Zγ,µµ,ττ,bb ATLAS Simulation Preliminary Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. 2HDM Type IV Combined h γ γ,zz*,ww* h Zγ,µµ,ττ,bb cos(β-α) ATLAS Simulation Preliminary Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. 4 (b) Type II 2HDM Type IV Combined h γ γ,zz*,ww* h Zγ,µµ,ττ,bb tan β 2HDM Type III ATLAS Simulation Preliminary Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo cos(β-α) Combined h γ γ,zz*,ww* h Zγ,µµ,ττ,bb 0.1 cos(β-α) (c) Type III (d) Type IV Figure 4: Regions of the (cos( ), tan ) plane of four types of 2HDMs expected to be excluded by ATLAS Simulation fits to the measured rates of Higgs boson production and decays. The confidence intervals account for Preliminary Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. 3 V.3 Martin, ECFA HL-LHC workshop /30/ cos(β-α) (a) Type I tan β 2HDM Type III tan β Combined tan β tan β Exp. 95% CL at s = 14 TeV SM Ldt = 300 fb-1-1: All unc. Ldt = 300 fb :-1No theo. Ldt = 3000 fb-1: All unc. Ldt = 3000 fb : No theo. tan β ATLAS Simulation Preliminary 2HDM Type I (b) Type II a possible relative sign between di erent couplings. The expected likelihood contours where 2 ln = 6.0, corresponding approximately to 95% CL (2 ), are indicated assuming the SM Higgs sector. The h Zγ,µµ,ττ,bb light shaded and hashed regions indicate the expected exclusions. Combined h γ γ,zz*,ww*

25 Analysis Techniques ATLAS HL-LHC studies have to consider: upgraded ATLAS detector + trigger systems collision energy, s = 14 TeV high pile-up, <µpu>, of 140 or 200 We use generator-level s = 14 TeV Monte Carlo samples Overlay with jets from dedicated pile-up library pile-up library contains fully simulated pile-up jets with <µpu> = 140 or 200 Reconstruct electron, muons, jets, photons and missing-et from generator+overlay information To simulate the response of the detector: smear pt and energy of reconstructed physics objects using smearing functions apply reconstruction efficiencies for electrons, muons and jets To emulate triggers: apply trigger efficiency functions Smearing and efficiency functions determined from fully-simulated samples using ATLAS HL-LHC detector and high pile-up Functions are dependent on pt and η Most analysis presented use single lepton or di-lepton triggers (e, µ) di-τ triggers and 4-jet triggers used for particular analyses Parametrised b-tagging (based on ATLAS Run 1 MV1 tagger) is performed on reconstructed jets This approach to ATLAS HL-LHC prospects studies has been validated on a limited number of physics studies comparing full simulation and the 6/30/17 generator-level+smearing technique 25

26 Higgs Width at HL-LHC Measure off-shell production of H ZZ* 4l with m(4l)>220 GeV Use m(4l) shape and matrix element to discriminate between signal and background stat. uncertainties only: µoff-shell= stat.+syst. uncertainties: µoff-shell= Off-shell production used to constrain the Higgs boson width ΓH m(4l) For Γ = ΓSM combining with on-shell measurement, (assuming off-shell measurement dominates): Γ H= MeV (stat+sys) Events normalized to unit area gg H* ZZ (S) gg (H* )ZZ (SBI) gg ZZ qq ZZ ATLAS Simulation s=14 TeV M.E. Run 1 limit: Γ H < 22.7 MeV at 95% CL (WW, ZZ) /30/17 26

27 Higgs coupling K-Framework Couplings in! framework ATL-PHYS-PUB Assuming ΓH is sum of SM widths, calculate uncertainties on Higgs boson couplings. Deviations from the SM are quantified using κ multiplier, in SM κi = 1, e.g.: 2 2 g ( BR)(gg H )= SM (gg H) BR SM (H ) 2 H Assume universal modifications to Higgs couplings to fermions (!F) and vector bosons (!V) κ F Ldt = 300 fb : All unc. -1 Ldt = 300 fb : No theo. Standard Model Combined h γ γ, ZZ*, WW* h Zγ, µµ, τ τ, bb -1 Ldt = 3000 fb : All unc. Ldt = 3000 fb : No theo MCHM 4 ξ=0.3 ξ=0.2 MCHM 5 ξ=0.1 ξ=0.1 ξ=0.0 ATLAS Simulation Preliminary Exp. 95% CL at s = 14 TeV κ V 6/30/17 Figure 2: 27 Expected two-dimensional likelihood contours in the (apple V, apple F ) coupling plane, where 2 ln = 6.0 corresponds approximately to 95% CL (2 ). The coupling predictions in the MCHM4 and MCHM5 models are shown as parametric functions of the Higgs boson compositeness parameter = v 2 / f 2. The two-dimensional likelihood contours are shown for reference and should not be used to

28 ATLAS HL-LHC Analysis Strategy Detector performance of different physics objects (e, μ, γ, ) with MC (Full Sim.) Parametriza;on to provide smeared truth simula;on to benchmark analysis Jets from pile-up events are overlaid on the hard-scaier events Signals from interac;ons in previous bunch crossings are added (calorimeter response) Extrapola;on of Run-1/Run-2 results - similar detector performance and analysis approach as Run-1/Run-2 - Scale signal and background level to higher luminosity, c.o.m. energy Systema;cs (will have ~x more higgs at HL-LHC than at the end of Run-2) - Theore;cal: from Run1/Run2 - Experimental: scaled to best guess for ATLAS upgraded detector at HL-LHC Pile-up suppression (~factor 50) track-confirma;on requirement (~0.2 p.u. jets/event) 6/30/17 28

29 Higgs Couplings Run-1 μ = (Δμ/μ ~ 0.23) Extrapola;on from Run-1 analysis at <μ PU > = 140 (ATL-PHYS-PUB ) μ = (Δμ/μ ~ 0.24) μ = (Δμ/μ ~ 0.33) With 3000 _ -1: W, Z couplings to 3% Muon coupling to 7% t,b,τ couplings to 8-12% 6/30/17 29