High-mass Higgs searches at ATLAS and CMS

Transcription

1 High-mass Higgs searches at ATLAS and Scott Snyder On behalf of the ATLAS and Collaborations Brookhaven National Laboratory, Upton, NY, USA Jul, 6 ICNFP, Crete Introduction Higgs VV Higgs Higgs Higgs fermions Higgs invisible Summary Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

2 Introduction Observed Higgs boson very consistent with SM expectations. Suspect EW sector of SM may not be complete: Naturalness, dark matter, etc. Search for a heavier Higgs-like particle. LHC started Run at s = TeV. Accumulated fb of usable data in. Total Integrated Luminosity (fb ) Integrated Luminosity, pp,, p s = TeV included from -6-8: to -- 6: UTC Offline Luminosity Jul LHC Delivered:. fb Recorded:.8 fb Aug Sep Date (UTC) Oct Nov fb Total Integrated Luminosity ATLAS Preliminary LHC Delivered ATLAS Recorded All Good for Physics Total Delivered:. fb - Total Recorded:.9 fb - All Good for Physics:. fb - s = TeV /6 /7 /8 /9 / / Day in Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

3 Some models with heavy Higgs bosons Most studied are two simple extensions to the SM: Electroweak singlet (EWS) New scalar singlet s that mixes with h. -Higgs-Doublet Model (HDM) Extra Higgs doublet. Physical particles h, H, A, H ±. Parameters: Masses: m h, m H, m A, m H ±. VEV ratio of the two doublets: tan β. Mixing angle between h, H: α. Potential parameter mixing the two doublets: m. Different ways to couple doublets with other particles; most studied: Type-I: All quarks couple to only one doublet. Type-II: Up-type quarks couple to one doublet, down-type quarks to the other. MSSM is a subset of HDM. Numerous MSSM benchmark models: hmssm, m mod+ h, etc. Denote the GeV resonance as h ; H is a heavier resonance. Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

4 Searches covered All results from TeV data unless otherwise specified. Higgs VV H ZZ l H ZZ llνν H ZZ llqq Higgs fermions H + tb [8 TeV] H + τν H/A ττ Higgs Higgs H ZA llbb A Zh llbb/ννbb Invisible Higgs decays ZH ll + (invisible) VBF H (invisible) H γγ covered elsewhere. Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

5 Higgs VV H ZZ l H ZZ llνν H ZZ llqq Covered in Garabed s talk Merged channels: H VV ννqq, lνqq, llqq, qqqq H Zγ Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

6 H ZZ l Based on m h = GeV analysis. same-flavor, OS l pairs. One < m ll < GeV; other < m ll < GeV. BG mostly ZZ, est. from MC σ ( gg X ZZ l ) (fb) [-PAS-HIG--] - Preliminary.8 fb ( TeV) Observed 9% CLs Γ=, expected ± s.d. Γ=, expected ± s.d. Γ = GeV Γ = GeV Γ = GeV Events / GeV Preliminary fb H() qq ZZ, Zγ* gg ZZ, Zγ* Z+X ( TeV) tanβ m X (GeV) Preliminary -.8 fb Obs. 9% CL limit Exp. 9% CL limit ( TeV) HDM Type I, cos(β-α)=. m A = m H ± = m H + GeV H ZZ l (HIG--) Non-perturbative region m l (GeV) Exclusions for several resonance widths. Also tan β limits for type-i,ii HDM.. m H (GeV) ATLAS analysis: [ATLAS-CONF--9] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 6 /

7 H ZZ llνν Require Z ll, large ET miss, no b-tags. Add l requirements on φ(z, ET miss) and pz T. Discriminating variable: m T (ll, ET miss). Events / GeV /SM Pred. ATLAS Preliminary ggf H ( GeV) - s = TeV,. fb ggf H (6 GeV) qq ZZ ggf H ( GeV) WZ H ZZ llνν gg ZZ Z(ee/µµ )+jets tt/wt/z(ττ)+jets/ww Triboson ttv/ttvv Fake Lepton Stat. Syst. Unc [GeV] ZZ m T VV : MC WZ: MC normalized to data Z + jets: data-driven * BR(H ZZ) [fb] 9% Limit on σ ggf 6 ATLAS Preliminary - TeV,. fb H ZZ llνν [ATLAS-CONF-6-] Expected Median Expected ±σ Expected ±σ Observed [GeV] m H analysis: [-PAS-HIG-6-] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 7 /

8 H ZZ llqq Merged analysis Z ll; small E miss T large-r Z-tagged jet w/p T > GeV p T (ll) >.m ll Dominant BG: Z + jets, also t t. Resolved analysis [ATLAS-CONF-6-6] Z ll; small ET miss; j w/7 < m jj < GeV pt (ll) + p T (jj) >.m lljj Tagged (b) and untagged (< b) categories. Merged Untagged resolved Combined Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 8 /

9 Higgs Higgs Covered in Xiaohu s and Andrey s talks H hh bbττ H hh bbγγ H hh lνlνbb H hh bbbb Covered here: analyses involving CP-odd scalar A H ZA llbb A Zh llbb/ννbb Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 9 /

10 data Drell-Yan TT Full Lept Single top Zh ZZ H ZA - H ZA - Uncertainties data Drell-Yan TT Full Lept Single top Zh ZZ H ZA - H ZA - Uncertainties H ZA llbb Selection Z ll, b-tags For different hypothesized m A /m H pairs: rectangular window in m bb /m llbb plane. Evt / GeV Preliminary ee or µµ m bb (M [6,] GeV) + b-jets ll -. fb ( TeV) Backgrounds [-PAS-HIG-6-] Normalize backgrounds by fitting m ll outside signal region. Limits for m H = GeV; also derived for GeV and 8 GeV. BR [fb] σ Preliminary m H -. fb = GeV CL s Observed CL s Expected ± std. deviation ± std. deviation σ th (tan β = ) σ th (tan β =.) ( TeV) / MC Mass(jj) (GeV) Evt / 6 GeV Preliminary ee or µµ (M [6,] GeV) + b-jets ll -. fb ( TeV) HDM type-ii cos(β-α) =. / MC...8 m llbb m A [GeV] Mass(lljj) (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

11 A Zh llbb/ννbb Selection Either no l and ET miss or Z ll and small ET miss. bb either from two small-r jets ( < m jj < GeV) if pt Z < GeV or a large-r jet (7 < m J < GeV) otherwise. Either or b-tags. Final discriminant: m(zh)/m T (Zh). Events / GeV ATLAS Preliminary A Zh (σ= fb) - m A =6 GeV s = TeV Diboson Ldt =. fb lep., large-r jets, tag tt Single top V GeV p W+(bb,bc,cc,bl) T W+cl 7 GeV m < GeV Z+(bl,cl) bb Z+(bb,bc,cc) Z+l Uncertainty Pre-fit background Backgrounds [ATLAS-CONF-6-] Shapes from MC. Z + jets, t t control regions included in final fit to constrain dominant backgrounds. Events / GeV ATLAS Preliminary s = TeV Ldt =. fb lep., jets, tags V p < GeV T GeV m < GeV bb - A Zh (σ= fb) m A=6 GeV Diboson Vh tt Single top W+(bb,bc,cc,bl) Z+(bl,cl) Z+(bb,bc,cc) Uncertainty Pre-fit background /Pred m T (Vh) [GeV] l, tag, high-p T /Pred m(vh) 9 [GeV] m(vh) [GeV] l, tags, low-p T Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

12 9% C.L. limit on σ(a Zh) BR(h bb) [pb] Production via ggf Observed (CLs) Expected (CLs) ± σ ± σ Z ν ν expected (CLs) Z ll expected (CLs) ATLAS Preliminary s = TeV, Ldt =. fb - A Zh Zbb b A h Z b ℓ, ν ℓ, ν [ATLAS-CONF-6-] Production w/associated b s 9% C.L. limit on σ(a Zh) BR(h bb) [pb] A Zh ``bb/ννbb () ATLAS Preliminary s = TeV, Observed (CLs) Ldt =. fb - Expected (CLs) ± σ A Zh Zbb ± σ b b h A Z ℓ, ν ℓ, ν b b ma [GeV] ma [GeV] pp A Zh m A=6 GeV Type I ATLAS Preliminary tan (β) tan (β) MSSM interpretations (MA = 6 GeV) s = TeV L dt=. fb - Obs 9% CL limit ±σ band Exp 9% CL limit ±σ band Excluded Γ A/mA>% pp A Zh m A=6 GeV Type II ATLAS Preliminary s = TeV L dt=. fb - Obs 9% CL limit ±σ band Exp 9% CL limit ±σ band Excluded Γ A/mA>% Type-I HDM Type-II HDM cos (β-α) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and cos (β-α) ICNFP Jul, 6 /

13 Higgs fermions Charged Higgs production and decay g H + g b H + b t g t For m H + > m t, production is dominantly pp t(b)h +. H + tb H + τν Decay is dominantly H + tb. But H + τν can be significant for high tan β. Also H ττ Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

14 * Diboson + Z/γ + H + tb, τν [8 TeV] Produced via pp t(b)h ±. Hadronic channel also sensitive to t t bh ± bh ±, t t bh ± bw. τ had + jets (τν): τ had, j, b, no l, angular separations. Extract limit from m T (τ had, ET miss ). BG: V + j, VV, t τ: Replace µ in µ + j with sim. τ multijet: from data via fake rate; t t w/fake τ from MC ll (tb/τν): l, j, ET miss, b. Extract limit from n btag. BG: From MC. µτ had (tb/τν): As above with µτ had instead of l and b. BG: From MC, with fake-factor for misidentified τ had. l + jets (tb): l, E miss T, j, b. Extract limit from H T, binned in b-tag multiplicity. BG: Shapes from MC, normalizations float in fit. Events / GeV 8 6 τ had + j pp t(b)h, H τ ν τ τ h +jets final state + H m H += GeV Multijets (data) EW+tt EW+tt fb with τ h (data) no τ h (sim.) Bkg. stat. unc. (8 TeV) Bkg. stat. syst. unc. < Events / GeV > l + j, tag fb µ + jets final state N b tag + H tb [ GeV] tt W+c W+b W+u,d,s,g Single top quark Multijets (8 TeV) Bkg. unc. (stat. syst.) [pb] τν + 9% CL limit on σ H + B H - - tan β τ had + j + + pp t(b)h, H τ + ντ τ h +jets final state Observed fb Expected median Expected median 6 m + H [GeV] ± ± (8 TeV) σ σ [pb] σ H 9% CL limit on - Observed Excluded [arxiv:8.777] pp l+jets, + + t(b)h, H µτ, ll h Observed tb fb final states + Assuming B(H tb) = Expected median Expected median other chans. 6 m + H [GeV] fb + pp t(b)h H + τ + ν τ final states: τ h +jets + H tb final states: l+jets, µτ, ll h modm MSSM h Expected median ± σ Expected median ± σ MSSM m h = GeV MSSM m h ± GeV (8 TeV) ± ± (8 TeV) σ σ /Bkg.... Bkg. stat. syst. unc. Bkg. stat. unc. 6 7 m T [GeV] /Bkg.. H T [GeV]. H T [GeV] 6 [GeV] m + H ATLAS tb analysis: [arxiv:.7] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

15 ± H + τν Final state: (t jjb)bτ had ν j, b, τ had, l veto, ET miss > GeV, m T > GeV Discriminant: m T (τ had, E miss Events / GeV / SM.. ATLAS s = TeV,. fb Uncertainty MisID j tt τ & single top T ) MisID e/µ Z+jets Diboson + W+jets H τν GeV ( ) + H τν τ GeV ( ) [GeV] m T m T [GeV] [ATLAS:arXiv:6.9] W /Z: shape from MC, norm. to data Multijet: From data e,µ faking τ: MC, validated with data ν) [pb] τ ± BR(H ) ± σ(pp [b]th tanβ 6 ATLAS s = TeV,. fb Observed (CLs) Expected (CLs) ± σ ± σ + H hmssm tanβ= m + H [GeV] Run result Observed Expected ATLAS s= TeV,. fb + H τν; hmssm scenario Observed exclusion Expected exclusion ± σ ± σ m H + [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

16 H/A ττ Selection Channels: τ eτ had, τ µτ had, τ eτ µ, τ had τ had. Candidates are OS and well-separated in R. τ eτ had, τ µτ had : No OS ee or µµ pairs. m T (l, ET miss ) < GeV (e) < GeV (µ). Topological t t rejection in τ eτ µ. Categorize: -tag, tag. Backgrounds [-PAS-HIG-6-6] Z ττ: MC, cross-checked w/z µµ. W + jets, multijet: From SS and high-m T control regions. t t: From MC, cross checked in data CRs. (/GeV) dn/dm T,ττ Obs/Exp (/GeV) dn/dm T,ττ Obs/Exp µτ h no b-tag Preliminary µτ, -tag τ h τ h b-tag Preliminary Z ττ Z µµ Electroweak tt QCD -. fb Background uncertainty h,h,a ττ Observation ( TeV) mod+ m h, m A = GeV, tanβ= Z ττ m T,ττ -. fb (GeV) ( TeV) Electroweak tt QCD Background uncertainty τ h,h,a ττ had τ had, taggedobservation. mod+ m h, m A = GeV, tanβ= m T,ττ (GeV) 9% CL limit on σ(ggφ) B(φ ττ)(pb) - - µτ h +eτ h +eµ+τ h τ h Preliminary -. fb ( TeV) Observed Expected ±σ Expected ±σ Expected gg fusion (GeV) m φ tanβ 6 Preliminary hmssm scenario -. fb ( TeV) 9% CL Excluded: Observed ± σ Expected Expected ± σ Expected 6 8 m A (GeV) Also results from associated b production and other MSSM benchmarks. Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 6 /

17 = GeV =. GeV = 6. GeV = 6 GeV H/A ττ Selection Either OS τ l τ had (w/z ll veto) or τ had τ had. Select on φ and m T (τ, τ had,l ). b-veto ( tag) and tagged ( tag) categories. Use mt tot as discriminant. (mt tot) = mt (E miss T, τ )+mt (E miss T, τ )+mt (τ, τ ) Events / GeV τ l τ had, b-veto ATLAS Preliminary H/A ττ s = TeV,. fb m A = GeV, tan H/A τ lep τ had Jet l,τ fakes b veto Z ττ tt, single top Diboson Z ee/µµ Uncertainty Pre fit background β = Events / GeV τ had τ had, b-veto ATLAS Preliminary s = TeV,. fb H/A τ had τ had b veto Backgrounds [forthcoming pub.] [ATLAS-CONF--6] τ l τ had : BG w/ true τ/l from MC; misidentified τ/l from fake-factor method. τ had τ had : Multijet BG from fake-factor method; other BGs from MC with fake factors applied. H/A ττ m A = GeV, tan Multi jet Z ττ + jets W τν + jets tt, single top Others Uncertainty Pre fit background β = BR(φ ττ) [pb] σ ATLAS Preliminary, H/A ττ, gluon gluon fusion s= TeV,. fb, 9% CL limits Observed Expected ± σ ± σ τ lep τ had (Exp.) τ had τ had (Exp.) /Pred Events / GeV /Pred.... τ l τ had, b-tag 6 7 tot m [GeV] ATLAS Preliminary s = TeV,. fb H/A τ lep τ had b tag H/A ττ m A = GeV, tan Jet l,τ Z ττ fakes tt, single top Diboson Z ee/µµ Uncertainty Pre fit background β = /Pred Events / GeV /Pred.. τ had τ had, b-tag tot m T [GeV] ATLAS Preliminary s = TeV,. fb H/A τ had τ had b tag H/A ττ m A = GeV, tan Multi jet Z ττ + jets W τν + jets tt, single top Others Uncertainty Pre fit background β =.. 6 tot m T [GeV] tanβ 6 8 m [GeV] H/A ATLAS Preliminary, mod+ MSSM m h H/A ττ, 9% CL limits = GeV m H m h m h = GeV m H scenario, M SUSY m h s= TeV,. fb = TeV 6 8 m [GeV] A = GeV m H m h Observed Expected ± σ ± σ τ lep τ had (Exp.) τ had τ had (Exp.) T Also associated b production. 6 7 tot m [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 7 /

18 Invisible Higgs decays Invisible decays of scalars is a feature of models with SUSY (LSP) or large extra dimensions (graviscalar). Search for invisibly-decaying heavy scalar. Tag production of scalar by associated production with Z or by vector boson fusion. H Z H W H Z Z W Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 8 /

19 ZH ll + invisible [-PAS-HIG-6-8] Assume H decays exclusively to invisible (LSP, etc). Require Z ll + E miss T. Z ll w/pt Z > 6 GeV, E miss T > GeV, veto leptons, hard jets, b-tags. Requirements on φ and ET miss/pz T balance. /-jet bins. Β(H invisible) (pb) σ qq ZH Observed Median expected Expected ± σ Expected ± σ SM σ qq ZH -. fb ( TeV) Preliminary miss ZH l+e T +/-jets 6 Higgs boson mass (GeV) Z + jets: From γ + jets Others: Different-flavor leptons. Events Events data Z+jets/γ WZ ZZ VVV -. fb ( TeV) WW+top-quarkPreliminary ZH() jet category jet 6 8 data Z+jets/γ WZ ZZ VVV -. fb [GeV] m T ( TeV) WW+top-quarkPreliminary ZH() jet category jet 6 8 [GeV] m T Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 9 /

20 H invisible [VBF] [-PAS-HIG-6-9] Assume H decays exclusively to invisible (LSP, etc). Require VBF jet pair +E miss T. j, η jj >.6, m jj > GeV ET miss > GeV, no l, φ(j, ET miss) >. Events Events -. fb ( TeV) QCD W lν Preliminary EWK W lν Top QCD VV QCD Z νν EWK Z νν Signal η jj -. fb ( TeV) 6 QCD W lν Preliminary EWK W lν Top QCD VV QCD Z νν EWK Z νν Signal control regions Z µµ; single-e, µ, or τ; min φ(et miss, j) <. Norm. BG by fitting to CRs; result from counting experiment. σ x B(Φ inv) [pb] 6 m Φ [GeV] M jj (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 / Preliminary VBF Φ invisible g =g Φ SM H -. fb ( TeV) 9% CL limits Observed limit Expected limit Expected limit (σ) Expected limit (σ) (SM) σ VBF

21 Summary Many searches, many channels leave no stone unturned! No signal from data. But accumulating more data rapidly. Already have fb of data recorded more than all of! Expect first results from these data at ICHEP. Stay tuned! ] - Total Integrated Luminosity [fb 6 ATLAS Online Luminosity s = TeV LHC Delivered ATLAS Recorded - Total Delivered:.7 fb - Total Recorded:.6 fb 8 6 / / 8/7 Day in 6 Total Integrated Luminosity (fb ) 8 6 Apr Integrated Luminosity, pp, 6, p s = TeV included from 6-- :8 to 6-7- : UTC LHC Delivered:. fb Recorded:.6 fb Offline Luminosity (Preliminary) May 8 May May May 9 May Jun Date (UTC) Jun 9 Jun 6 Jun Jul Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 / 8 6

22 Backup Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

23 H ZZ l [ATLAS-CONF--9] Selection based on m h = GeV analysis Events/ GeV ATLAS Preliminary H ZZ* l TeV,. fb Higgs (m = GeV) H ZZ* Z+jets, tt tt+v, VVV Uncertainty [GeV] m l BR(S ZZ l)[fb] 9% Limit on σ ATLAS Preliminary TeV,. fb S ZZ l Expected Observed ±σ ±σ Narrow width [GeV] m S Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

24 H l [-PAS-HIG--] tanβ Preliminary -.8 fb Obs. 9% CL limit Exp. 9% CL limit ( TeV) HDM Type I, cos(β-α)=. m A = m H ± = m H + GeV H ZZ l (HIG--) Non-perturbative region tanβ Preliminary -.8 fb Obs. 9% CL limit Exp. 9% CL limit ( TeV) HDM Type II, cos(β-α)=. m A = m H ± = m H + GeV H ZZ l (HIG--) Non-perturbative region. m H (GeV). m H (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

25 H ZZ llνν Require Z ll, ET miss > GeV, no b-tags. categories: jet, jet, and VBF. (VBF: cent, fwd jets w/ η >, m jj > GeV) Discriminating variable: m T (ll, E miss T ). VV BG from MC; Z + jets modelled by Z + γ. Entries Entries Preliminary data Top/W/WW Instr. MET ZVV WZ ZZ ggh(7) qqh(7) Syst. + Stat. ee =jets 6 8 µµ =jets 6 8 Transverse mass [GeV] ee jets 6 8 µµ jets 6 8 Transverse mass [GeV] -. fb ( TeV) ee vbf 6 8 µµ vbf 6 8 Transverse mass [GeV] ATLAS analysis: [ATLAS-CONF-6-] [-PAS-HIG-6-] Exclusion of SM-like heavy Higgs as fcn. of m H and Γ H. ggf/vbf combined. Γ/Γ SM.9 Preliminary fb µ h() ( TeV) =.9 ±. M H [GeV] Observed µ = σ 9% / σ th Observed Expected ±σ Interpret as EWS with mixing parameter C. σ 9% (gg H ZZ) (fb) -. fb ( TeV) Predicted Expected Observed Preliminary C'=. C'=. C'=. C'=.6 C'=. C'=. C'=.6 C'=. C'=. C'=.6 C'=. C'=. ggf σ 9% (qq H ZZ) (fb) -. fb ( TeV) Predicted Expected Observed Preliminary C'=. C'=. C'=. C'=.6 C'=. C'=. C'=.6 C'=. C'=. C'=.6 C'=. C'=. VBF M H [GeV] M H [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

26 H VV XXqq (merged) ννqq No l; ET miss > GeV; Z-tagged large-r jet pt miss > GeV; angular requirements BG: W /Z + jets, t t (shape MC, norm data) Events / GeV ATLAS Z+jets - W+jets s = TeV,. fb Top quark G* ZZ ννqq Dibosons G* m = TeV Fit total uncertainty ννqq lνqq [arxiv:66.8] l; ET miss > GeV; W -tagged large-r jet p T,J and p T,lν > max( GeV,.m lνj ); Veto on b-tag close to J BG: W + jets, t t (shape MC, norm data) Events / GeV ATLAS W+jets - Top quark s = TeV,. fb Dibosons G* WW lνqq Z+jets G* m = TeV Fit total uncertainty lνqq /SM.. /SM.. qqqq m [GeV] T ET miss < GeV; W /Z-tagged large-r jets l; p T,J/ > / GeV; other topo req. BG: multijet (analytic fit) llqq similar to previous slide. Events / GeV /SM m lνj [GeV].. ATLAS - s = TeV,. fb G* VV qqqq Background fit G* m = TeV Fit total uncertainty qqqq m JJ [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 6 /

27 H XXqq (merged) () [arxiv:66.8] Set combined exclusion limit for narrow scalar resonance to VV. σ(pp Scalar VV) [pb] - - ATLAS - s = TeV,. fb Observed CL S limit Expected CL S limit Expected ± σ Expected ± σ Scalar Singlet (NDA) Scalar Singlet (Unsupp.) /Λ [ - ] - Scalar VV (lvqq + llqq + vvqq + qqqq) - [GeV] m Scalar - Interpret as new heavy neutral scalar: Λ: energy scale c H : Coupling to SM Higgs. c : Coupling to gluons. Use naive dimensional analysis (NDA) and unsuppressed benchmarks /Λ [ - ] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 7 /

28 H Zγ [ATLAS-CONF-6-] Z ee, µµ + γ Also Z jj using large-r jets (p γ T > GeV) Plot m(z γ); fit background outside signal region with an analytic function. Events / GeV - b Events / GeV - b ATLAS Preliminary ll Background-only fit, b - s= TeV,. fb m llγ [GeV] ATLAS Preliminary jj Background-only fit, b - s= TeV,. fb m Jγ [GeV] Limits for narrow signal width. BR(X Zγ) [fb] 9% CL limit on σ(pp X) Z ee,µµ Z qq Observed Expected Exp. ± σ Exp. ± σ ATLAS Preliminary pp X Zγ - s= TeV,. fb [GeV] m X analysis: [-PAS-EXO-6-9] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 8 /

29 H Zγ [-PAS-EXO-6-9] Z ee, µµ + γ Plot m(z γ); fit background outside signal region with an analytic function. Events / ( GeV ) Preliminary ee -.7 fb Fit ( TeV) Uncertainty Limits for two signal widths. BR(A Zγ) [fb] Preliminary W =.% -.7 fb Observed Expected ± Expected ± ( TeV) σ σ (data-fit)/σ stat Events / ( GeV ) (data-fit)/σ stat 6 8 Preliminary + - M(e e γ) [GeV] -.7 fb Fit µµ ( TeV) Uncertainty 9% CL UL on σ BR(A Zγ) [fb] 9% CL UL on σ Resonance Mass [GeV] M(µ + µ γ) [GeV] Resonance Mass [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 9 / 6 Preliminary W =.6% -.7 fb Observed Expected ± Expected ± ( TeV) σ σ

30 H hh bbτ τ channels: τ e τ had, τ µ τ had, τ had τ had. Selection OS τ s; b-tagged jets 8 < m ττ, m bb < 6 GeV Discriminant is m ττbb ; found from a kinematic fit. [/GeV] kinfit dn/dm H bb τ h τ h preliminary channel -.7 fb [GeV] kinfit m H ( TeV) tt QCD Drell-Yan Other bkg. bkg. uncertainty m H = 8 GeV m H = GeV m H = GeV σ(pp H) BR (H hh) = pb Backgrounds [-PAS-HIG-6-] Z + jets: MC shape, normalized to µµ data Multijet: From SS data t t + other: MC Signal model: Narrow CP-even resonance decaying to hh 9% CL limit on σ(pp H) BR (H hh bbττ) [pb] preliminary Observed CLs Expected CLs Expected ± σ Expected ± σ -.7 fb bb µτ + bb eτ h + bb τ h τ h h combined channels ( TeV) m H [GeV] τ had τ had more sensitive at lower m H. Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

31 H hh bbγγ Selection γ; exactly b-tagged jets m γγ m h / < σ(m γγ ) [. GeV] 9 < m bb < GeV Final window cut in m γγbb around each hypothesized mass keeping 9% of signal (width GeV). Events /. GeV Fit 6 ATLAS Preliminary s = TeV,. fb tag signal region Di Higgs Single Higgs Continuum Bkg. Sum 6 m γγ [GeV] Non-resonant search not covered here. Sideband Region m h m h ɛb bƃɣɣ Signal Region B ɛ ɣɣ Signal Backgrounds m ɣɣ m bƃɣɣ m bƃɣɣ m X [ATLAS-CONF-6-] B ɛ ɣɣ B N SR m h B ɛ bƃɣɣ N SB m ɣɣ From data using sidebands in m γγ and m γγbb. Extrapolation to signal region derived from -tag sample. [pb] 9% CL limit on σ X BR X hh ATLAS Preliminary s = TeV,. fb Obs. limit Exp. limit Exp. limit Exp. limit ±σ exp ±σ exp m X [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

32 H hh lνlνbb Selection OS leptons; b-tagged jets BDT trained at m H = GeV (for m < GeV) or m H = 6 GeV. BDT variables m ll, R ll, R jj, φ ll,jj, p T ll, p T jj, min R l,j, M T Events /. Preliminary µµ + ee + µe + eµ channels Signal ( pb) mx = GeV mx = 6 GeV mx = 9 GeV Uncertainty -. fb ( TeV) tt Drell-Yan Single top VV ttv SM Higgs Backgrounds [-PAS-HIG-6-] Fit BDT output to signal+bkg model in bins: signal region plus BDT/m jj sidebands. BR(HH bblνlν) (fb) HH) Preliminary Observed 9% upper limit Expected 9% upper limit Expected limit ± std. deviation Expected limit ± std. deviations radion (Λ R =. TeV, kl=) HDM, tanβ=., cos(β-α)=. m = GeV, m = GeV, m =m H =m ± h A h Type I Type II -. fb ( TeV) / MC BDT output spin- 9% CL limit on σ(pp X spin- (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 / m X

33 H hh bbbb Resolved: b-tagged small-r jets Boosted: large-r jets w/ or associated b-tagged track jets t t veto Mass-dependent requirements on p T jet pairs/large-r jets. ( mh GeV.m h ) + ( mh GeV.m h ) <.6 [GeV] subl m J ATLAS s tt enriched - = TeV,. fb Boosted, tags lead m J [GeV] 8 6 Events / GeV of Non-resonant search not covered here. [arxiv:66.78] Multijet: Norm. -tag data to -tag CR t t: Normalize MC to CR Events / GeV / Bkgd σ(pp H hh bbbb) [fb] ATLAS - s= TeV,. fb Signal Region, Resolved Multijet 6 8 mj [GeV] 6 8 m j [GeV] ATLAS - s= TeV,. fb Resolved Boosted tt Syst+Stat Uncertainty G*(8) k/m Pl =. Observed Limit (9% CL) Expected Limit (9% CL) Expected ±σ Expected ±σ m H [GeV] analysis: [-PAS-HIG-6-] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

34 H hh bbbb b-tagged small-r jets Low mass (6 GeV): σ h = 7 GeV High mass ( GeV): σ h = GeV ( mh GeV σ h ) + ( mh GeV σ h ) < Backgrounds [-PAS-HIG-6-] Fit curve to m bbbb from sideband regions. Events / GeV Preliminary -. fb ( TeV) in SR m H (GeV) Preliminary SR -. fb ( TeV) Medium Pull m (GeV) m X (GeV) SB m H (GeV) σ(pp X) BR(X H(bb) H(bb)) (fb) Preliminary Expected Upper Limit Expected ± -. fb σ Expected ± σ Observed Upper Limit ( TeV) Radion, Λ R = TeV, kl= 6 8 (GeV) m X Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

35 H ZA llbb [-PAS-HIG-6-] BR [fb] σ Preliminary m H = GeV m H -. fb ( TeV) = GeV CL s Observed CL s Expected ± std. deviation ± std. deviation σ th (tan β =.) σ th (tan β = ) σ th (tan β =.) BR [fb] m H = 8 GeV σ Preliminary m H -. fb ( TeV) = 8 GeV CL s Observed CL s Expected ± std. deviation ± std. deviation σ th (tan β = ) σ th (tan β =.) HDM type-ii cos(β-α) =. HDM type-ii cos(β-α) = m A [GeV] 6 7 m A [GeV] Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /

36 H + tb [8 TeV] Search for t t l + jets plus additional b. Fit data to CR and one SR: j(b), j( b), j(b), 6j(b) H T j( b) BDT BDT incl. p T (j ), H T, m bb, R(bb), nd Fox-Wolfram mom. BG: t t: MC + data-based p T -reweight; multijet from data; others from MC. Events /. ATLAS Post bkg-only fit - s=8 TeV,. fb tt+lf gb th + (tb) j( b) tt+cc tt+bb Other bkg Total unc. Total bkg in sig+bkg fit + H GeV shape tb) [pb] + )xbr(h + σ(gb th - ATLAS s=8 TeV,. fb + gb th (tb) modσxbr m h tanβ=. modσxbr m h modσxbr m h - tanβ=.7 tanβ=.9 [arxiv:.7] Observed limit (CLs) Expected limit (CLs) ± σ ± σ Exp. limit with injected signal m H += GeV, σxbr=.6 pb 6 m + H [GeV] /Bkg BDT output Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 6 /

37 Φ ++ l + l + [7 TeV] q Z/γ Φ ++ l + β Φ [arxiv:7.666] l γ l δ Type-II seesaw model for generating neutrino masses includes a scalar triplet with physical particles Φ ++, Φ +, Φ. Produced as either Z/γ Φ ++ Φ or W + Φ ++ Φ. Primary decay Φ ++ l + l + (decay to W + W + suppressed for realistic neutrino masses). Search in categories lll, llτ had, llll, lllτ had, llτ had τ had (l e, µ, flavors may be mixed in a category). Plot mass of same-sign lepton pairs. Events / GeV s = 7 TeV, Ldt =.9 fb Drell-Yan Diboson t t Single top Signal ( GeV) Events / GeV s = 7 TeV, Ldt =.9 fb Drell-Yan Diboson t t Single top Signal ( GeV) q q q Z/γ Φ ++ Φ W Φ l + β Interpret in terms ++ of benchmark points of type-ii seesawφ model. l γ q ν δ l+ α l + β l γ l δ l + α BP: Neutrino sector with a massless neutrino and normal mass hierarchy. q q W Other benchmark points in paper. σ B [pb] σ B [pb] Normal hierarchy: BP s = 7 TeV, Ldt =.9 fb Expected limit (associated production) Observed limit (associated production) Associated production cross section Mass of Φ ±± [GeV] Expected limit (pair-production) Observed limit (pair-production) Pair-production cross section Mass of Φ ±± [GeV] 9% CL upper limit on σ/σmodel Normal hierarchy: BP s = 7 TeV, Ldt =.9 fb Φ ++ Φ ±σ band ±σ band Expected limit (combined) Observed limit (combined) Mass of Φ ±± [GeV] l + α l + β l γ ν δ m(l ± l ± ) [GeV] -lep m(l ± l ± ) [GeV] -lep 9% CL: m(φ ++ ) > 8 GeV (BP) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 7 /

38 H γγ Select primary vertex using photon pointing and NN discriminant. p T (γ) > GeV; m γγ > GeV p T (γ ) >.m γγ; p T (γ ) >.m γγ [arxiv:66.8] [arxiv:66.9] p T (γ) > 7 GeV EBEB: Both γ in barrel; m γγ > GeV EBEE: barrel γ, endcap γ; m γγ > GeV Also categorize on γ shape and B field on/off. Events / GeV ATLAS Background-only fit Spin- Selection - s = TeV,. fb Events / GeV EBEB -.7 fb ( TeV,.8 T) Fit model ± s.d. ± s.d. - fitted background m γγ [GeV] (data-fit)/σ stat m γγ (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 8 /

39 H γγ () [arxiv:66.8] [arxiv:66.9] Exclusion limits for narrow scalar resonance from TeV data. BR [fb] 9% CL Upper Limit on σ fid Observed CL s limit Expected CL s limit Expected ± σ Expected ± σ ATLAS - s = TeV,. fb NWA (Γ X = MeV) Spin- Selection [GeV] m X p-value plot for a narrow scalar resonance from 8 and TeV data combined. p Γ - m X =., J= X Combined 8 TeV TeV p -. fb ( TeV) fb m X (GeV) (8 TeV) σ σ σ σ σ σ m X (GeV) Results also available for other widths. Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 9 /

40 H γγ () [arxiv:66.8] [arxiv:66.9] m γγ from 8 TeV data Events / GeV ATLAS Background-only fit Spin- Selection - s = 8 TeV,. fb Events / GeV min(r 9 ) >.9 EBEB fb (8 TeV) Fit model ± s.d. ± s.d. - fitted background m γγ [GeV] (data-fit)/σ stat m γγ (GeV) Scott Snyder (BNL) High-mass Higgs searches at ATLAS and ICNFP Jul, 6 /