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The WW scattering

Plans for the Study of the WW Scattering process in CMS as a model independent way to clarify the symmetry breaking mechanism. The WW scattering. The SM predicts that without a Higgs the scattering amplitude of W L W L fusion process violates unitarity at about 1.-1.5 TeV ….

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The WW scattering

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  1. Plans for the Study of the WW Scattering process in CMSas a model independent way toclarify the symmetry breaking mechanism

  2. The WW scattering The SM predicts that without a Higgs the scattering amplitude of WLWL fusion process violates unitarity at about 1.-1.5 TeV…. …. then something must happen: if there is a Higgs we will observe a resonance at M(H)= M(WW) otherwise s(WW) will deviate from SM prediction at a energy scale M(WW) where the symmetry breaking mechanism occurs. We should study the resolution of CMS ons(WW),onM(WW) the highest M(WW) reachable and the neededLuminosity WW fusion

  3. Model Independent • Standard Model Cross Section to generate the signal sample for the study. • NO non-standard Symmetry Breaking Mechanism was assumed!!! • Measurement of the s(WW) vs M(WW) from 200 GeV up to ~2 TeV WW fusion

  4. Jet in the HF (very forward hadr. calor.): high Pt (>40 GeV), high Inv Mass. f q f p q WW ZZ WZ sVV p q f q f Jet in the HF (very forward hadr. calor.): high Pt (>40 GeV), high Inv Mass. 6 fermion final state WW fusion

  5. M(WW) changing M(H) # of events for L =100 fb-1 e = 100 % M(H)=500 GeV M(H)=2000 GeV M(H)=50 GeV M(WLWL) Pythia 72+77 WW fusion

  6. The people involved Exp.Torino: N.Amapane, M.Arneodo, S.Bolognesi, G.Cerminara, C.Mariotti, E.Migliore Theor. Torino: E.Accomando, A.Ballestrero, E.Maina, G.Passarino, R.Pittau, V.Del Duca Exp Moscow: V.Gavrilov, A.Krokhotin, A.Oulianov, N.Iyina, O.Kodolova, I.Vardanyan Theor. Moscow: E.Boss, A.Sherstnev WW fusion

  7. The Monte-Carlo Development of event generators: for signal: full Matrix Element VV-scattering MC (Torino-Theoretical group) a complete 6 fermions (mnqqqq) final state MC: signal +background (for the moment we use Pythia) W+n-jets:COMPHEP (MSU Group) differences with Pythia, see A.Krokhotin talk at Jet-Met in october WW fusion

  8. The Objects and the Algorithms These channels are interesting also from the technical point of view, since they need the development of many object and algorithms: jets central & forward, missing energy, muons, electrons W, Z mass reconstruction (jet jet, ln, ll) fake jet suppresion pile-up WW fusion

  9. A preliminary study A preliminary study on pp  qqWLWL qq mn qq with 20k evts signal and 50k evts background (W+jet, tt) has been done using PYTHIA/COMPHEP and CMSJET. (G.Cerminara – talk at Sept.02 and Feb.03 PH meeting ), The results are encouraging: resolution on M(WW) ~ 10 % S/B >1 for M(WW)>500 GeV at 5% of the signal efficiency(….to be increased) WW fusion

  10. The continuation • We are moving to the full simulation+reconstruction • We will use the PRS-mu root-trees • We will also study ZZ mn jj and WWmnmn • and WZ mnqq, mmqq •  • We want to measure the M(WW) distribution • from 200 GeV up to 2 TeV: • the continuum and the eventual resonances WW fusion

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