Vector boson scattering at CMS (LHC)

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Presentation transcript:

Vector boson scattering at CMS (LHC) HERA-LHC workshop Vector boson scattering at CMS (LHC) Experimental and theoretical Group Torino + Moscow Gianluca CERMINARA Torino University and INFN

Why WW-fusion? VLVL scattering is very sensitive to EWSB: SM predicts that without a Higgs the scattering amplitude violates unitarity at about ~1.2 TeV: Higgs case: resonance at MWW = MH No Higgs case: new dynamics MUST appear Model Independent Study of the VV-fusion channel: Which resolution on s vs MWW ? What is the range of MWW that we can explore?

Preliminary study pp → qqWW → qqmnqq (Highest BR + clear signature) Signal generated with PYTHIA (50k): MH = 500 GeV – 750 GeV – 1000 GeV No Higgs case (MH = 2000 GeV – 10000 GeV) s ≈ 2 x 10-2 ÷ 6 x 10-2 pb Fast Detector Simulation: CMSJET (No PU) Considered background: ttbar (PYTHIA) s ≈ 624 pb WW (PYTHIA) s ≈ 11 pb W+jj (CompHEP) s ≈ 77 pb Single W (PYTHIA) s ≈ 185 x 103 pb

[ [ [ Event selection Muon: pt > 30 GeV Neutrino: pt > 30 GeV pz calculated using the constraint: (p + p )2 = mW2 Jets from W decay: pt > 30 GeV |hjet| < 3 60 GeV < MW < 110 GeV Forward jet tagging: pt > 20 GeV 2 jets: hj1 x hj2 < 0 |hj1 - hj2| > 3 at least one with 1.5 < |hj1| < 5 or: 1 jet: |h| > 2 + central jet veto: (NO JETS with |h| < 3 and pt > 20 GeV) Additional requirements: M(jet tag system) > 550 GeV ptW > 100 GeV Rapidity gap: Dhjt-m > 1 Dhjt-jW > 1 [ [ [

Preliminary results (1) High luminosity needed to explore up to MWW ≈ 2 TeV Good sensitivity to MH dependences: 100 fb-1 100 fb-1 S/B to be improved

Preliminary results (2) Flat efficiency above ~ 800 GeV: ~40 – 50% Good resolution on MWW: s ≈ 10% BUT: NO Pileup, FAST detector simulation

What we are doing now First cross checks Fast-Full Simulation for channel: pp → qqWW → qqmnqq CMSJET + PileUp preliminary studies for ZZ and WZ final states. Full Simulation studies (OSCAR+ORCA) for ZZ, ZW, WW Test of 6 fermion final state MC (PHASE) in CMS (summer?)

PHASE PHact Adaptive Six Fermion Event Generator Features (E. Accomando, A. Ballestrero, E. Maina) Features Monte Carlo for LHC dedicated studies and full physics and detector simulation of All processes with 6 fermions final states up to now Boson Boson Fusion and scattering Higgs Production in this channel tt production Triple and Quadruple Boson Couplings Three Boson Production Complete helicity matrix elements Possible selection of particular set of diagrams soon New adaptive multi-channel method for efficient mapping of all possible peaks Present analyses on the possibility of defining boson boson scattering signal in presence of strong gauge cancellations One shot : Unweighted event generation of all processes (several hundreds) or any subset in a single run Parton shower and hadronization via Les Houches Protocol (Pythia up to now)

Full simulation studies Institute for Theorethical and Experimental Physics (ITEP) Moscow Full simulation vs Parton level study Particular focus on Central Jet Veto: Good ttbar background rejection but Low signal efficiencies (because of PU and detector effects) Possible to improve the efficiency using vertex constraint on jets. See talk: Andrei Krokhotine -CMS Week- 16 March 2004

Conclusions WW-scattering is a promising channel (especially if no (light) Higgs is found) Preliminary studies: High luminosity required in order to study s vs MWW up to ~ 2 TeV More complete study is NEEDED: Full Detector Simulation PileUp simulation More complete study of backgrounds New MC Generator (for 6 fermions final states)