High-pT lepton final states at 13 TeV (W and Z searches)

Transcription

1 High-pT lepton final states at TeV (W and Z searches) James Catmore (University of Oslo, Norway) on behalf of the ATLAS and CMS Collaborations 5st Rencontres de Moriond EW 06

2 W and Z Many BSM models predict the existence of massive spin objects decaying into pairs of leptons W lνl Z ll : l {e,μ,τ} Experimentally attractive: straightforward to trigger/reconstruct, SM backgrounds are either low or well understood Practically: the differences between the models are largely in the natural widths, ranging from around 0.5% to % (or non-resonant) Sequential Standard Model Applied to both W lνl and Z ll Couplings to fermions are identical to those of the SM W and Z. Used as a benchmark Grand Unification Model Applied to Z ll E6 gauge group breaks into SU(5) and two additional U() groups, physical states given by Z 0 ( E6 ) = Z 0 cos E6 + Z 0 sin E6 Six different te U() values groups for mixing resulting angle from θ lead theto b specific Z states Z ψ,χ,η,i,s Contact Interactions Applied to di-lepton final state Quark and lepton compositeness with a characteristic energy scale Λ corresponding to the binding energy between fermion constituent. Produces non-resonant excesses. James Catmore - Moriond EW 06

3 TeV ~ 8 TeV for a - TeV object Why Run is so important W.J. Stirling, private communication James Catmore - Moriond EW 06

4 TeV results overview 4 Z : search for narrow resonances in the di-lepton invariant mass distributions (Mee, M μμ ) or for non-resonant excesses above the SM background W : search for discrepancies p T above p T background in the transverse mass distribution: M T = q pt l Emiss T ( cos[df(~p T l,~p miss T )]). ATLAS and CMS recently updated their 8TeV limits with TeV data; this talk reviews these TeV results ATLAS CMS One-lepton (W ) ATLAS-CONF W {e, μ} + ET CMS-PAS-EXO5-006 W {e, μ} + ET Two-leptons (Z ) ATLAS-CONF Z {ee, μμ} ATLAS-CONF Z {eμ} CMS-PAS-EXO5-005 Z {ee, μμ} James Catmore - Moriond EW 06

5 Event selection and main backgrounds 5 Trigger: single e/μ (ee for Z ) Offline event selection: W : single e/μ plus missing transverse energy Z : ee/μμ Indicative signal efficiencies (CMS) TeV W : ~75% for e and μ Real leptons W Z Means of evaluation DY (W, Z, γ*) MC t/tbar, single top MC Di-bosons (WW, WZ,ZZ) MC TeV Z ee: ~75% barrel-barrel, 70% barrel-endcap TeV Z μμ: ~90% Indicative dilepton resolutions CMS TeV):.8% (barrel),.4% (barrel+endcap) CMS TeV): 4% ATLAS (ee > 00 GeV): < % ATLAS TeV): 9-%} Run evaluation Fake leptons (hadronic jets) With real leptons (W+jets) With each other (multijets) (Electrons) (Muons) (Electrons) (Muons) Data Data For the di-leptons: summed backgrounds are normalised to the level of the data in the region: 60/80 (CMS/ATLAS) <mll < 0 GeV mass independent systematics cancel James Catmore - Moriond EW 06

6 M μμ event (90 GeV) recorded by TeV

7 Mee event (9 GeV) recorded by TeV

8 Systematics 8 Experimental uncertainties on the leptons and MET Trigger (W ) Lepton reconstruction/ identification efficiency (W, Z ) Lepton isolation (W, Z ) MET scale/resolution (W ) Jet scale/resolution (W ) MC statistics at high mass (W, Z ) Normalisation (Z ) Uncertainties on the MC background/signal PDF-related for DY (W, Z ) Multi-jet and W+jets b/g (W ) Luminosity (W ) Extrapolation/interpolation needed to fill gaps and extend to the full search range James Catmore - Moriond EW 06

9 Entries W searches: transverse mass distributions (eν) 5 4 ATLAS Preliminary s = TeV,. fb W eν selection W ( TeV) W ( TeV) W (4 TeV) 9 Data W Top Multijet Z/γ * Diboson Data / Bkg Transverse mass [GeV] Drell-Yan (W) dominates (e.g. ~90% at TeV) Multi-jet of secondary importance Others largely irrelevant above TeV James Catmore - Moriond EW 06

10 W searches: transverse mass distributions (μν). fb ( TeV) Entries ATLAS Preliminary s = TeV,. fb W µν selection W ( TeV) W ( TeV) W (4 TeV) Data W Top Z/γ* Diboson Multijet Events CMS Preliminary µ+e miss T Data W µν tt Z/γ* Diboson SSM W'.4 TeV SSM W'.6 TeV Data / Bkg Transverse mass [GeV] Data/MC Systematic uncertainty band M T (GeV) Drell-Yan (W) dominates (e.g. ~90% at TeV) Others of secondary (and equal) importance James Catmore - Moriond EW 06

11 W searches: production and upper mass limits Electron, muon channels combined. fb ( TeV) σ B [pb] ATLAS Preliminary s = TeV,. fb W lν Expected limit Expected ± σ Expected ± σ Observed limit B (fb) σ 5 4 CMS Preliminary e,µ+e miss T σ SSM W' NNLO PDF+ α s Observed Expected ± σ ± σ W SSM 4 Run-I Limit m W [TeV] M W' [GeV] Expected (TeV) Observed (TeV) ATLAS CMS ATLAS CMS eν μν combined TeV James Catmore - Moriond EW 06

12 Z searches: invariant mass distributions (ee) Drell-Yan dominating background, others of secondary importance Events Data / Bkg 6 ATLAS Preliminary Data s = TeV,. fb Dilepton Search Selection Z/γ* Top Quarks Diboson Multi-Jet & W+Jets Z χ ( TeV) = 0 TeV - Λ LL Dielectron Invariant Mass [GeV] Events / GeV Resonant E6 model Z TeV Data + - γ/z e e tt, tw, WW, WZ, ZZ, ττ.6 fb ( TeV) CMS Preliminary Jets Narrow Z' (M = TeV) Z' m(ee) [GeV] Resonant SSM TeV Non-resonant contact interaction 0TeV James Catmore - Moriond EW 06

13 Z searches: invariant mass distributions (μμ) Drell-Yan dominating background around TeV, others of secondary importance Fakes insignificant above ~500 GeV Events Data / Bkg 6 ATLAS Preliminary Data s = TeV,. fb Dilepton Search Selection Z/γ* Top Quarks Diboson Z χ ( TeV) = 0 TeV - Λ LL Dimuon Invariant Mass [GeV] Events / GeV Data + - γ/z µ µ tt, tw, WW, WZ, ZZ, ττ.8 fb ( TeV) CMS Preliminary Jets Narrow Z' (M = TeV) Z' m(µ + µ ) [GeV] James Catmore - Moriond EW 06

14 Z searches: production and upper mass limits 4 Electron, muon channels combined σ B [pb] - - ATLAS Preliminary s = TeV,. fb Z ll Expected limit Expected ± σ Expected ± σ Observed limit Z SSM Z χ Z ψ +X) ll +X)/σ(pp Z+X ll σ(pp Z'+X CMS Preliminary.6 fb ( TeV ee) +.8 fb ( TeV, µµ) obs, width = 0% obs, width = 0.6% obs, width = % median, width = 0% median, width = 0.6% median, width = % Z' SSM (LOx.) Z' PSI (LOx.) [TeV] M Z M [GeV] Z ψ (width = 0.5% x M) Z SSM (width = % x M) Expected (TeV) Observed (TeV) Expected (TeV) Observed (TeV) ATLAS CMS ATLAS CMS ATLAS CMS ATLAS CMS ee μμ combined TeV James Catmore - Moriond EW 06

15 Lepton number violation through Z and quantum gravity 5 Extensions to the SSM Z model allow lepton-number violating decays to occur by introducing additional couplings σ BR [fb] 4 SSM s = TeV ± pp Z' e µ ± Quantum black holes could fail to respect lepton number conservation in their decay, and produce eμ final states Assume quantum gravity couples with equal strength to all SM particle degrees of freedom, allowing LFC violation but forbidding local symmetry violation (charge, colour) Assume black hole predominantly decay into twoparticle states ADD model: six extra dimensions (n=6) RS model: one highly warped extra dimension (n=) Very similar to the lepton flavour conserving Z analysis Low background, Drell Yan largely suppressed [fb] BR) gg + (σ qq BR) (σ Z' polemass [TeV] James Catmore [TeV]- Moriond EW 06 M th ADD RS s = TeV s = TeV Quantum Black Hole ± pp QBH e µ ±

16 Lepton number violation through Z and quantum gravity 6 Events ATLAS Preliminary s = TeV,. fb Data Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Z' TeV QBH RS TeV Systematics σ B [pb] Expected limit Expected ± σ Expected ± σ Observed limit Z' SSM ATLAS Preliminary s = TeV,. fb Z' eµ [TeV] M Z' Data/MC σ B [pb] Expected limit Expected ± σ Expected ± σ Observed limit Expected (TeV) m eµ [GeV] Observed (TeV) QBH ADD n=6 QBH RS n= Z SSM.9.0 ADD n= RS n= ATLAS Preliminary s = TeV,. fb QBH eµ James Catmore - Moriond MEW th [TeV] 06

17 Outlook and conclusions 7 ATLAS and CMS have well-developed searches in place for heavy counterparts of the W and Z boson Both detectors demonstrate excellent performance in the relevant object reconstruction, and complement each other s strengths - inverse femtobarns of data at TeV has already allowed us to push the limits beyond Run for W and Z over TeV In 06 we expect ~ times more data What might we see this year? Some very interesting results ahead of us! James Catmore - Moriond EW 06

18 Back-up slides

19 ATLAS 9 James Catmore - Moriond EW 06

20 CMS 0 James Catmore - Moriond EW 06

21 Triggers ATLAS CMS eν e > 50 GeV, HCAL isolation at L or nonisolated > 60, 0 GeV e > 5 GeV or e > 5 GeV W μν μ > 50 GeV μ > 50 GeV, η <.4 or μ > 45 GeV, η <. Z ee e > {7 GeV, 7 GeV} ET e > { GeV, GeV} ET Hadronic calo deposits in cone centred around electron of size ΔR=0.4 must be less than 5% (barrel) or % (endcaps) of the electron energy μμ μ > 6 (isolated) 50 GeV μ > 50 GeV, η <.4 James Catmore - Moriond EW 06

22 Offline selections (W ) ATLAS CMS eν e pt > 65 GeV Tight for pt< 5, Medium otherwise Isolated ETmiss > 65 GeV mt >0 GeV e pt > 0 GeV Isolated Events with additional electrons > 5 GeV rejected W μν μ pt > 55 GeV Isolated ETmiss > 55 GeV mt > GeV μ pt > 5 GeV σpt/pt < 0. Isolated Events with additional muons > 5 GeV rejected Both Event must have a primary vertex Δϕ (pt, ptmiss > < pt/etmiss <.5 James Catmore - Moriond EW 06

23 Offline selections (Z ) ATLAS CMS ee e ET > 0 GeV Primary vertex Isolated No opposite charge requirement e ET > 5 GeV ηdet <.444 (barrel).566 < ηdet <.5 (endcap) At least one in the barrel Isolated No opposite charge requirement Z μμ μ pt > 0 GeV Primary vertex Isolated Opposite charge requirement μ > 5 GeV, η <.4 Isolated Common vertex fit χ /dof < 0 Opposite charge requirement James Catmore - Moriond EW 06

24 Data driven background estimation (matrix method) Used to calculate contamination from hadronic jets which are wrongly identified as leptons ( fakes ) Singly for W 4 Together or in combination with a real lepton for Z Idea of the matrix method: express the unknown quantities (number of fake candidates) in terms of quantities that can be measured from data Loosen the lepton ID criteria to produce a loose lepton sample Measure how many loose leptons pass the signal selection, use matrix method to link back to the actual fake yield e.g. for W (similar for Z but 4x4 matrix due to paired combinations) Tight leptons Loose leptons Invert matrix: Measurable N T N L! = R F R F! NR Unknown N F e of the equation describes the inaccess F tight R = Nreal N real loose ven in the firs! F = Nfake tight N fake loose background i F N F = R ( R (N L + N T ) F N T ) e quantities., Real leptons Fake leptons εf and εr are measured independently (using data driven methods such as tag-and-probe for efficiencies and enriched background samples for fake rates) James Catmore - Moriond EW 06

25 W supplementary results

26 W searches: production limits 6 Electron, muon channels separately σ B [pb] ATLAS Preliminary s = TeV,. fb W eν Expected limit Expected ± σ Expected ± σ σ B [pb] ATLAS Preliminary s = TeV,. fb W µν Expected limit Expected ± σ Expected ± σ Observed limit Observed limit W SSM W SSM 4 Run-I Limit Run-I Limit m W [TeV] m W [TeV]. fb ( TeV). fb ( TeV) B (fb) σ 5 4 CMS Preliminary miss e+e T σ SSM W' NNLO PDF+ α s Observed Expected σ Br [fb] 5 4 CMS Preliminary µ+e miss T σ SSM W' NNLO PDF+ α s Observed Expected ± σ ± σ ± σ ± σ M W' [GeV] M James Catmore W' (GeV) - Moriond EW 06

27 ATLAS systematics 7 Source Electron channel Muon channel Background Signal Background Signal Trigger negl. (negl.) negl. (negl.) % (%) % (4%) Lepton reconstruction and identification negl. (negl.) negl. (negl.) 6% (%) 5% (8%) Lepton isolation negl. (negl.) negl. (negl.) 5% (5%) 5% (5%) Lepton momentum scale and resolution % (%) % (6%) 49% (69%) 5% (%) ET miss resolution and scale < 0.5% (< 0.5%) < 0.5% (< 0.5%) % (%) % (%) Jet energy resolution < 0.5% (< 0.5%) < 0.5% (%) % (%) % (%) Multijet background % (9%) n/a (n/a) negl. (negl.) n/a (n/a) PDF choice for DY production % (%) n/a (n/a) % (%) n/a (n/a) PDF variation for DY production 8% (%) n/a (n/a) 6% (8%) n/a (n/a) Luminosity 8% (4%) 9% (9%) 9% (9%) 9% (9%) Total % (6%) 4% (%) 5% (7%) % (5%) James Catmore - Moriond EW 06

28 CMS event yields 8 0 Electrons M T >500 GeV M T >00 GeV M T >500 GeV Data 0.0 SM Background 46 ± 8 4. ±..9 ± 0. SSM W M=.4TeV 66. ± ± ± 4.4 SSM W M=.6TeV 5.5 ± ± ± 0.6 : Number of events in the electron decay channel integrated above given M thr Muons M T > 500 GeV M T > 00 GeV M T > 500 GeV Data 0 0 SM Background 5.5 ± ±..8 ± 0. SSM W M=.4TeV 94.6 ± ± ±.6 SSM W M=.6TeV 6. ± ± ± 0. : Number of events in the muon decay channel integrated above given M thresh James Catmore - Moriond EW 06

29 MC sample details 9 Drell-Yan NLO Powheg-Box v, CT PDF + Pythia Photos FSR Normalised as function of mass to NNLO pqcd using VRAP + CT4NNLO PDF Generated in slices to ensure full coverage Top Powheg-Box v (ttbar), Powheg-Box v (single top), CT PDF + Pythia6.48 Normalised to cross section as calculated by Top++.0 Diboson Sherpa.., CT PDF Signal Pythia8.8, NNPDF LO. No interference. WZ decay forbidden. Normalised as per DY samples James Catmore - Moriond EW 06

30 W MC details 0 ATLAS CMS DY NLO Powheg-Box v, CT PDF + Pythia Photos FSR Normalised as function of mass to NNLO pqcd using VRAP + CT4NNLO PDF Generated in slices to ensure full coverage W: inclusive in mass - Madgraph 5_aMC@NLO W: high mass slices - Pythia8., tune CUETP8M, NNPDF.0 PDF Mass dependent k-factor for high MT tails: NNLO QCD using FEWZ.β, NLO E/W corrections using MSCANC High mass DY: Powheg Top Powheg-Box v (ttbar), Powheg-Box v (single top), CT PDF + Pythia6.48 Normalised to cross section as calculated by Top++.0 ttbar: Powheg Single top: Powheg in in t- and tw-channels, amc@nlo in s-channel Diboson Sherpa.., CT PDF Pythia8., tune CUETP8M, CT PDF Signal Pythia8.8, NNPDF LO. No interference. WZ decay forbidden. Normalised as per DY samples Pythia8., tune CUETP8M, NNPDF.0 PDF K-factors to NNLO via FEWZ.β James Catmore - Moriond EW 06

31 Z supplementary results

32 Z searches: production limits Electron, muon channels separately σ B [pb] ATLAS Preliminary s = TeV,. fb Z ee Expected limit Expected ± σ Expected ± σ Observed limit Z SSM σ B [pb] ATLAS Preliminary s = TeV,. fb Z µµ Expected limit Expected ± σ Expected ± σ Observed limit Z SSM Z χ Z χ - Z ψ - Z ψ [TeV] M Z [TeV] M Z σ(pp Z'+X ee+x)/σ(pp Z+X ee+x) CMS Preliminary.6 fb ( TeV, ee) obs, width = 0% obs, width = 0.6% obs, width = % median, width = 0% median, width = 0.6% median, width = % Z' SSM (LOx.) Z' PSI (LOx.) M [GeV] σ(pp Z'+X µµ+x)/σ(pp Z+X µµ+x) CMS Preliminary.8 fb ( TeV, µµ) obs, width = 0% obs, width = 0.6% obs, width = % median, width = 0% median, width = 0.6% median, width = % Z' SSM (LOx.) Z' PSI (LOx.) James Catmore M [GeV] - Moriond EW 06

33 ATLAS results for all resonant models ee [TeV] µµ [TeV] `` [TeV] Model Width [%] Exp Obs Exp Obs Exp Obs ZSSM Z ZS ZI ZN Z Z James Catmore - Moriond EW 06

34 ATLAS systematics 4 Source Dielectron Dimuon Signal Background Signal Background Normalisation 4.0% (4.0%) N/A 4.0% (4.0%) N/A PDF Choice N/A 9.% (7%) N/A 5.% (7.4%) PDF Variation N/A 5.% (%) N/A 4.4% (6.5%) PDF Scale N/A.8% (.%) N/A.7% (.9%) Photon-induced corrections N/A.4% (5.4%) N/A.% (.8%) E ciency 5.% (5.0%) 5.% (5.0%) % (9%) % (9%) Scale & Resolution <.0% (<.0%) 7.8% (9.%) 0% (6%) 0% (46%) Multi-jet & W +jets N/A <.0% (<.0%) N/A N/A MC Statistics <.0% (<.0%) <.0% (<.0%) <.0% (<.0%) <.0% (<.0%) Total 6.5% (6.4%) 5% (4%) 5% (%) 6% (5%) James Catmore - Moriond EW 06

35 ATLAS full yields 5 m ee [GeV] Drell Yan 45 ± 0 8 ± 6 6 ± ± ± ± 0.0 Top Quarks 4.8 ± ±. 0.9 ± ± ± < 0.00 Diboson 7.7 ±..4 ± ± ± ± 0.00 < 0.00 Multi-Jet & W+Jets 4 ± 4. ± ± ± ± < 0.00 Total SM 0 ± 46 ± 7 7 ± ± ± ± 0.0 Data SM+Z 0 (m Z 0 =TeV) 0± 46 ± 7 7 ± ±.6.6 ±..44 ± 0.4 SM+CI ( LL =5TeV) 07± 49 ± 7 0 ± ±.6. ± ± 0.09 m µµ [GeV] Drell Yan ± ±..8 ±. 4.5 ± ± ± 0.0 Top Quarks 9.5 ± ± ± ± 0.0 < 0.00 < 0.00 Diboson.98 ± ± ± ± ± < 0.00 Total SM 5 ± ±. 4. ±. 4.6 ± ± ± 0.04 Data SM+Z 0 (m Z 0 =TeV) 5± ±. 4. ±. 4.6 ± 0.7. ± ± 0.4 SM+CI ( LL =5TeV) 6± 8 8. ±.4 5. ±. 5.5 ± ± ± 0.05 James Catmore - Moriond EW 06

36 ATLAS p-value distributions 6 0 Local p ATLAS Preliminary s = TeV, Ldt =. fb Observed p, Z χ ee 0 Local significance 0σ 0 Local p ATLAS Preliminary s = TeV, Ldt =. fb Observed p, Z χ µµ 0 Local significance 0σ σ σ 4 0σ σ σ Global significance for largest excess σ σ 4 0σ σ σ Global significance for largest excess σ σ m Z [TeV] m Z [TeV] 0 Local p ATLAS Preliminary s = TeV, Ldt =. fb Observed p, Z χ ll 0 Local significance 0σ σ 0σ σ σ σ 4 σ Global significance for largest excess m Z [TeV] James Catmore - Moriond EW 06

37 ATLAS limits for non-resonant (CI) production 7 Λ [TeV] 40 5 ATLAS Preliminary s = TeV,. fb Prior: /Λ Observed Expected Expected ± Expected ± σ σ 0 s = 8 TeV, 0 fb LL Const LL Dest LR Const LR Dest RL Const RL Dest RR Const RR Dest Chiral Structure James Catmore - Moriond EW 06

38 ATLAS limits for non-resonant (CI) production 8 Left-Left [TeV] Left-Right [TeV] Right-Left [TeV] Right-Right [TeV] Channel Prior Const. Destr. Const. Destr. Const. Destr. Const. Destr. Exp: ee / Obs: ee Exp: ee / Obs: ee Exp: µµ / Obs: µµ Exp: µµ / Obs: µµ Exp: `` / Obs: `` Exp: `` / Obs: `` James Catmore - Moriond EW 06

39 CMS Mee distributions in barrel and endcaps 9 Events / GeV 5 4 barrel-barrel Data + - γ/z e e tt, tw, WW, WZ, ZZ, ττ.6 fb ( TeV) CMS Preliminary Jets Narrow Z' (M = TeV) Z' m(ee) [GeV] Events / GeV 5 4 barrel-endcap Data + - γ/z e e tt, tw, WW, WZ, ZZ, ττ.6 fb ( TeV) CMS Preliminary Jets Narrow Z' (M = TeV) Z' James Catmore - Moriond m(ee) EW [GeV] 06

40 Z MC details 40 ATLAS CMS NLO Powheg-Box v, CT PDF + Pythia Photos FSR DY Mass dependent k-factor to NNLO using VRAP + CT4NNLO PDF Powheg.0, NNPDF.0 PDF + Pythia8 Mass-dependent EW corrections at NLO using mcsanc and CT4 PDF set Top Powheg-Box v (ttbar), Powheg-Box v (single top), CT PDF + Pythia6.48 Normalised to cross section as calculated by Top++.0 Powheg.0 Diboson Sherpa.., CT PDF Pythia8 Signal Pythia8.8, NNPDF LO. No interference for resonant. For non-resonant, both DY and CI samples generated to account for interference. Pythia8 James Catmore - Moriond EW 06

41 Z eμ supplementary results

42 Kinematic variables of e, μ for selected pairs 4 Events 5 4 ATLAS Preliminary s = TeV,. fb Data Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Events / ATLAS Preliminary Data 4 s = TeV,. fb Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Events / ATLAS Preliminary Data 4 s = TeV,. fb Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Data/MC 0.5 Data/MC 0.5 Data/MC µ p T [GeV] η µ φ µ Events 5 4 ATLAS Preliminary s = TeV,. fb Data Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Events / ATLAS Preliminary Data 4 s = TeV,. fb Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Events / ATLAS Preliminary s = TeV,. fb Data Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Data/MC 0.5 Data/MC 0.5 Data/MC e p T [GeV] η e James Catmore - Moriond φ EW 06 e

43 Kinematic variables of eμ for selected pairs 4 5 ATLAS Preliminary Data 4 s = TeV,. fb Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics Events / 0.5 Data/MC η eµ Events / ATLAS Preliminary Data 4 s = TeV,. fb Top Quarks Diboson Multi-Jet & W+jets Drell-yan ττ Systematics - Data/MC φ eµ James Catmore - Moriond EW 06

44 Local p-value 44 0 Local p ATLAS Preliminary s = TeV,. fb Local significance Observed p 0 Z' eµ 0σ σ σ σ 4 4σ M Z' [TeV] 5 James Catmore - Moriond EW 06

45 Expected and observed candidates by data-taking period ATLAS Preliminary s = TeV,. fb Data Simulation 800 Events Period D Period E Period F Period G Period H Period J James Catmore - Moriond EW 06

46 Systematics 46 James Catmore - Moriond EW 06

47 Expected and observed yields 47 James Catmore - Moriond EW 06

48 Z eμ MC details 48 Z signal: Pythia8, NNPDFLO PDF 5 mass points from 500 GeV to 5TeV No interference QBH signal: QBH, CTEQ6L PDF + Pythia8 ADD and RS models threshold mass points in 500 GeV steps, from -8TeV Single top and ttbar: Powheg-Box v CT PDF + Pythia6.4.8 Di-bosons: Sherpa.., CT PDF Drell-Yan: Pythia8, NNPDF. PDF k-factors for QCD and EW corrections to NNLO with FEWZ and CT4NNLO PDF James Catmore - Moriond EW 06