Study of Higgs boson production in the WW decay channel at the LHC
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1 Study of iggs boson production in the decay channel at the LC Tatjana Lenz on behalf of the and CMS collaborations.8.3 Rencontres du Vietnam
2 Introduction n th July - the discovery of a new particle n and CMS today: n ~.5x larger data set n reduced experimental uncertainties n new exclusive analyses - event categories targeting specific production modes n channel: n large branching ratio n clear signature n but no mass peak Production mass range luminosity ggf -6.9/9.6 lvlv VBF -6.9/. CMS W, W lv -.9/9.6 new V, V jj -3.9/9.6 ggf -.9/.7 lvlv VBF -.9/.7 V, 3l or l -.9/.7 new new high mass 6-.7 iggs BR + Total Uncert [%] VBF cc µµ bb ZZ gg γγ Z ggf V M ZZ LC IGGS XS WG 3
3 µvµv candidate 3
4 iggs to lvlv CMS n exactly two opposite sign iso. leptons (e,µ) and large MET n cuts on mll, pt(ll), Z-peak veto, b-jet veto, Z/γ* rejection using MVA n split in categories: n jet multiplicity: j, j, j n separated in same (SF) and opposite (DF) flavour n challenging backgrounds: n data-driven methods for reducible bkg: /tw,, Z ll, Z ττ n WZ/ZZ, V+γ* from MC n fit to data in sidebands n analysis categories: n j, j DF category: D shape analysis n j, j SF category: m dependent cuts on Δφ(ll), pt(lmax), pt(lmin), mll, mt n VBF category: or 3 jets ( jets with pt > 3 GeV), no jets in the gap Δη(jj) >3.5 and mjj>5 GeV o events / data / MC o events / 3 data / MC data m =5 GeV 5 VV Top 8 Z/ γ* stat. syst. 6 CMS Preliminary, L = 9.5 fb s = 7 TeV, L =.9 fb -jet eµ o Δφ [ ] o Δφ [ ] ll 5 data m =5 GeV 5 VV Top Z/ γ* stat. syst. DF, j CMS-PAS-IG3-3 VBF: CMS-PAS-IG- DF, j CMS Preliminary, L = 9.5 fb s = 7 TeV, L =.9 fb -jet eµ o Δφ [ ] o Δφ [ ] ll
5 Mll M ll iggs to lvlv CMS M = 5 GeV CMS preliminary L = 9.5 fb (8TeV) M T MT signal, j. (5.) obs. (exp.) significance at 5 GeV 95% C.L. Limit on / SM j, j DF category: D shape analysis M ll Background CMS preliminary L = 9.5 fb (8TeV) background, j CMS Preliminary s=7 TeV, L =.9 fb s=8 TeV, L = 9.5 fb l /-jet j+j Observed M T Median Expected Expected ± Expected ± Injection m =5 GeV ± poor mass resolution broad excess 8 6 M ll ±.9.3 ± ± 3..7 ±.7.9 ± 3.. ±. 8. ±.5-3. ± ± ± ± 7..6 ± ± ± 5.5. ± 6. CMS-PAS-IG3-3 Data - Background CMS preliminary L = 9.5 fb -8. ± ± ±.3 -. ± 7..3 ± ± ±.5 7. ± 3.6. ±. 5.9 ±.. ± ± 5..6 ± ± ± additional SM iggs-like boson excluded in the mass range 8-6 GeV at 95% CL. (8TeV) M T j m 5
6 iggs to Spin CMS M ll n test spin- resonance which couples to through minimal couplings (% gg production) n final state can t be fully reconstructed but use other spin-sensitive variables: n Δφ(ll), Mll, mt n DF only, all jet bins n build a maximum likelihood fit like in the standard analysis but for both models - SM and spin- model n use test statistic q to quantify the consistency of data to the two models min (5 GeV) CMS preliminary L = 9.5 fb (8TeV) spin-, j M T 8 6 M ll M = 5 GeV CMS preliminary L = 9.5 fb (8TeV) spin-, j M T Generated experiments 8 6 CMS Preliminary s = 7 TeV, L =.9 fb ;, L = 9.5 fb + + CMS data CMS-PAS-IG3-3 spin-: % gg ln(l /L + ) + exclusion of the spin- hypothesis at 86% CL in favour of SM 6
7 V, iggs to CMS CMS-PAS-IG3-7 V, lv and V jj n same event preselection as / jet analysis plus: n two central jets with pt > 3 GeV and η <.5, Δφ(ll,jj) < 65, 65<m(jj)<5 GeV n 3% V, 6% gg and % VBF at 5 GeV n m dependent cuts on ΔR(ll), mll, mt n 95% CL on σ/σsm at 5 GeV: 5.(.) obs(exp) W, lv and W lv n look for 3 isolated leptons (e,µ) and large trans. miss. energy n two categories according to the presence of an OSSF pair or not n shape based approach based on ΔR(l+l-) n 95% CL on σ/σsm at 5 GeV: 3.3(3.) obs(exp) entries data m =5 WZ Events / GeV data/exp 6.5 data x gg x V WZ/ZZ V+γ/V+γ* top DY+jets CMS preliminary L = 9.5 fb VVV.5 3 ZZ CMS preliminary top & V+jets L = 9.5 fb SSSF Δ R(l l ) entries V, V->jj data m =5 WZ m jj CMS-PAS-IG3-9 ZZ CMS preliminary top & V+jets L = 9.5 fb OSSF Δ R(l l ) 7
8 evµv + jets e µ jet jet met 8
9 iggs to lvlv n single e, µ triggers n lepton pt > 5, 5 GeV n jet pt > 5 GeV, 3 GeV for η >.5 n rel. MET > 5 GeV E miss T = ->lvlv irreducible norm. to data jet fakes lepton data driven Vγ(*) photon conversion MC not identified b-jets norm. to data Wt not identified b-jet norm. to data Z->ττ real missing energy norm. to data ZZ->llvv irreducible MC WZ lose lepton MC Events ( ET miss if / ET miss sin if < / Events / GeV hp://arxiv.org/abs/37.7 Ldt =.7 fb 8 * e µ ggf VBF Data SM iggs boson = 5 GeV m 6 8 SR CR Ldt =.7 fb split jet bins j, j, +j * e µ + jets Data SM iggs boson = 5 GeV m N jets n ggf category(j+j): iggs spin- and V-A decays collinear leptons n DPhill <.8, Ptll > 3 GeV, Mll < 5 GeV Data / bkg Data SM sig.+bkg m ll 9
10 iggs to lvlv n VBF category(+j): Events / GeV Data - Bkg. n require b-veto and two forward jets n ΔYjj >.8, Mjj > 5 GeV split in ee, µµ, eµ and µe jet, jets and >=jets channels s = 7 TeV Ldt =.6 fb Ldt =.7 fb * l l + / jets ggf Data + SM iggs boson = 5 GeV m Bkg. subtracted data SM iggs boson m = 5 GeV m T Local p 3 Events / Ldt =.7 fb * e µ + j Data y jj VBF binned likelihood fit of * l l Obs. Exp. m = 5.5 GeV s = 7 TeV ± ± ggf m = 5 GeV VBF m = 5 GeV ( 5) Ldt =.6 fb Ldt =.7 fb limited mass resolution m 3 Events / 83 GeV 5 5 hp://arxiv.org/abs/ Events / GeV Ldt =.7 fb * e µ + j Data s = 7 TeV Ldt =.6 fb Ldt =.7 fb * e µ + j VBF ggf m = 5 GeV VBF ( 5) m = 5 GeV VBF m T m jj Data + VBF m = 5 GeV ggf m = 5 GeV j+j eµ fit in bins of Mll
11 V channel: BR [pb] 95% CL Limit on σ iggs to lvlv high mass search: n based on the previous analysis but: Events / GeV n n 8 6 lepton pt > GeV only DF, all jet bins Preliminary Ldt =.7 fb e µ + jets Data SM (sys stat) WZ/ZZ/W Z+jets [5 GeV] [3 GeV] [6 GeV] ( ) [9 GeV] ( ) Events / 5 GeV n W, Z production in 3l, l channels n 95% CL on σ/σsm is 7.(3.6) obs(exp) Preliminary, L dt =.7 fb 3-lepton (Z-depleted) 3l channel Data Total bkg. VVV VV Fakes V [5 GeV, ] 6 8 miss ET,rel Events / 5 GeV 3 - Preliminary, -lepton L dt =.7 fb Data Total Bkg. VVV ZZ Fakes Z [5 GeV, ] l channel miss ET m T CONF-3-67 Preliminary eνµν, SM width Ldt =.7 fb Obs. ggf+vbf Exp. ggf+vbf ± σ ± σ BR m σ Th SM width 6 < m() < 6 GeV Local p combined: (V) (V) Preliminary Obs. Exp. (V) (V) s = 7 TeV: Ldt =.7 fb : Ldt =.7 fb -CONF m σ σσ 3σ σ 5σ 6σ
12 Data/(sig.+bkg.) Events /. iggs to Spin n same preselection like in the rate analysis but jet, eµ-channel only n looser cuts on metrel, pt(ll), M(ll), Δφ(ll) n train separate BDTs on variables: pt(ll), M(ll), Δφ(ll) and mt n J=+,-,+ and + vs all backgrounds n study test statistic of J=+ vs others Arbitrary units.3.. Simulation * eνµν/µνeν + jets P + J = P + J =, f = 5% qq 3 Δφ [rad] ll hp://arxiv.org/abs/37.3 Arbitrary units..3.. Simulation * eνµν/µνeν + jets P + J = P + J =, f = 5% qq 6 8 m ll Ldt =.7 fb * eνµν/µνeν + jets Data sig.+bkg. P + J = Z+jets WZ/ZZ/Wγ Events /. Data 8 6 Ldt =.7 fb * eνµν/µνeν + jets sig.+bkg. P + J = Z+jets WZ/ZZ/Wγ q 5 5 * e µ /µ e Ldt =.7 fb Data Signal hypothesis P + J = P + J = Spin Arbitrary units BDT(+) Simulation Data/(sig.+bkg.) * eνµν/µνeν + jets BDT(+) Background P + J = P + J =, f = 5% qq BDT(+, f = 5%) qq qq-fraction f qq [%] spin-+ excluded at at least 95%CL spin+ at 9% CL spin- at 98% CL
13 Summary n a iggs boson seen beyond any doubts in all three bosonic channels n evidence in the channel n looks more and more like a SM iggs boson n no evidence for additional iggs bosons at higher or lower mass CMS-PAS-IG3-5 γγ γγ Combined γγ µ =.8 ±. bb (V tag) bb ( tag) (untagged) (VBF tag) (V tag) (/ jet) (VBF tag) (V tag) ττ (/ jet) ττ (VBF tag) ττ (V tag) ZZ (/ jet) ZZ ( jets) s = 7 TeV, L 5. fb CMS Preliminary p =.9 SM, L 9.6 fb m = 5.7 GeV - - Best fit σ/σ SM m = 5.5 GeV µ = s = 7 TeV Ldt =.6-.8 fb Ldt =.7 fb ±.3 ±.5 ± Low p µ =.6 Tt -. ± igh p µ =.7 Tt -.6 ±.5 jet high mass (VBF) µ = ±.6 V categories µ =.3 ±.9 ZZ* l VBF+V-like categories Other categories hp://arxiv.org/abs/37.7 µ =.3 µ =. µ =.5 * l l µ = ±.33 ±.7 ± ±.35 ±. ±. ±. + jet µ =.8 ±. +.7 jet VBF µ =. ±.5 µ = Comb., ZZ*, * ±. ±.5 ±. (stat) (sys) (theo) Total uncertainty ± on µ 3 Signal strength (µ) 3
14 BACKUP
15 iggs to lvlv CMS CMS-PAS-IG3-3 events / GeV/c 8 6 data m =5 GeV 5 VV Top Z/ γ* stat. syst. CMS Preliminary, L = 9.5 fb s = 7 TeV, L =.9 fb -jet eµ M ll M = 5 GeV CMS preliminary L = 9.5 fb (8TeV) signal, j M T M ll Background CMS preliminary L = 9.5 fb (8TeV) background, j M T data / MC m [GeV/c ] standard selection for D fit m ll [GeV/c ] events / GeV/c data / MC data m =5 GeV 5 VV Top Z/ γ* stat. syst. CMS Preliminary, L = 9.5 fb s = 7 TeV, L =.9 fb -jet eµ m [GeV/c ] m ll [GeV/c ] M ll Data - Background CMS preliminary L = 9.5 fb (8TeV) ± 8.7 ±. ± 9. ±.9 ± 9.9 ± ± 7. ±. ± 8.9 ±. ± 9.3 ± ± 8.3 ± 8.7 ± 9. ± 8.8 ±.6 ± ± 7. ± 8.6 ± 9. ± 8.9 ± 9. ± ± 7.6 ± 7. ± 8. ± 7. ± 8. ± M T j
16 iggs to lvlv CMS CMS-PAS-IG3-3 6
17 iggs to Events /.5 Events / GeV Ldt =.7 fb * e e /µ µ + j Data Ldt =.7 fb * e µ + j ggf m = 5 GeV VBF m = 5 GeV ( 5) Data VBF m = 5 GeV ggf m = 5 GeV y jj Events / 83 GeV Events / GeV Ldt =.7 fb * e e /µ µ + j Data ggf m = 5 GeV VBF m = 5 GeV ( 5) 5 Data VBF SF and DF Ldt =.7 fb * e e /µ µ + j m jj VBF m = 5 GeV ggf m = 5 GeV Events /.5 rad Events /.5 rad hp://arxiv.org/abs/37.7 Ldt =.7 fb * e µ + j Ldt =.7 fb * e e /µ µ + j Data VBF m = 5 GeV ggf m = 5 GeV Data ll VBF m = 5 GeV ggf m = 5 GeV ll [rad] [rad] m ll m ll 7
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