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Exclusive DPE Higgs generators in fast CMS simulation

Exclusive DPE Higgs generators in fast CMS simulation. Marek Taševský (Physics Inst. Prague) Low-x workshop - Sinaia (Romania) 01/07 2005. 1. New RP acceptances 2. Comparison of DPEMC, ExHuMe and EDDE at parton, hadron and detector levels 3. Event yields for H->WW.

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Exclusive DPE Higgs generators in fast CMS simulation

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  1. Exclusive DPE Higgs generators in fast CMS simulation Marek Taševský (Physics Inst. Prague) Low-x workshop - Sinaia (Romania) 01/07 2005 1. New RP acceptances 2. Comparison of DPEMC, ExHuMe and EDDE at parton, hadron and detector levels 3. Event yields for H->WW

  2. DPE Higgs event generators • DPEMC 2.4 (M.Boonekamp, T.Kucs) - Bialas-Landshof model + rap.gap survival probability - Herwig for hadronization 2. EDDE 1.2 (V.Petrov, R.Ryutin) - Regge-eikonal approach - Pythia for hadronization 3. ExHuMe 1.3 (J.Monk, A.Pilkington) - KMR model for exclusive diffraction - Pythia for hadronization - Improved unintegrated gluon pdfs All three models available now in the fast CMS simulation!

  3. Fast CMS simulation: FAMOS_1_2_0_pre4 Main chapters: - Fastcalorimetry, FastElgamma, FastElMatching - FastTsim, FastBtag - FastJets, FastMET, FastHLTMET - FastMuon, FastMuonTrigger - FastTotem (just Roman Pots), FastCastor Jet algorithm: o) Iterative cone o) Cone radius = 1.0

  4. FAMOS: Jet Energy Scale Correction 0 < |ηjet| < 1 1 < |ηjet| < 2 2 < |ηjet| < 3 |ηjet| > 3

  5. New RP acceptances for β*=0.55m Update of RP acceptances for recent LHC optics (V.Avati and K.Osterberg from Totem exp.) V6.5 V6.2 β*=0.55m 0.5m x*=500μm 0 μm Beam X-angle=142 μrad 150 μrad Proton trajectories simulated with MADX These acceptances recently put in FAMOS. A check performed with flat input ξ, t and φ distributions.

  6. New RP acceptances: check with flat inputs

  7. Mh acceptance

  8. H->bb, mh=120 GeV: Protons

  9. H->bb, mh=120 GeV: Protons

  10. H->bb, mh=120 GeV: Higgs

  11. H->bb, mh=120 GeV: b-quarks after FSR

  12. H->bb, mh=120 GeV: hadron level

  13. H->bb, mh=120 GeV: detector level

  14. H->bb, mh=120 GeV: detector level b-jets

  15. H->bb, mh=120 GeV: detector level

  16. ExHuMe: H->WW, mh=140 GeV: leptons

  17. ExHuMe: H->WW, mh=140 GeV: quarks

  18. Excl.DPE H->bb: Event yields per L=30 fb-1 • Selection cuts at detector level for mh=120 GeV: 0)Both protons accepted in one of two (220,420) RP stations • Njet > 1 2) 45 < Etj1*JESCor< 85 GeV, Etj2*JESCor> 30 GeV 3) |ηj1,2| < 2.5 4) |ηj1-ηj2| < 0.8 5) 2.8 < |φj1-φj2| < 3.48 6) Mj1j2/Mtot > 0.75 7) Mj1j2/Mmiss.mass > 0.8 8) Npart(3<|η|<6) = 0 9) 118 < Mmiss.mass < 122 GeV Generator σxBR[fb] Acc1*Acc2>0 gg->H->bb gg->bb gg->gg DPEMC 2.27 50% ? EDDE 1.94 46% ? ExHuMe 1.87 57% ? No b-tagging yet!

  19. Excl.DPE H->WW:Event yields per L=30 fb-1 • Both protons accepted in one of two RP’s (220, 420) • (L1 muons taken from FAMOS. El.+quarks correspond to parton level) • Various cut scenarios acc.to current CMS L1 thresholds: • Semi-leptonic W decay: • 1e (pt>29 GeV, |η|<2.5) or 1μ (pt>14 GeV, |η|<2.1) or • 1e (pt>20 GeV, |η|<2.5) + 2 quarks (pt>25GeV,|η|<5) or • 1μ (pt>10 GeV, |η|<2.1) + 2 quarks (pt>25GeV, |η|<5) • Fully leptonic W decay: • 2e (pt>17 GeV, |η|<2.5) or 2μ (pt>3 GeV, |η|<2.1) or • eμ (pte>17 GeV, |η|<2.5 and ptμ>3 GeV, |η|<2.1) or • 2e (ptmax>29 GeV,|η|<2.5) or 2μ (ptmax>14 GeV,|η|<2.1) or • eμ (pte>29 GeV, |η|<2.5 or ptμ>14 GeV, |η|<2.1)

  20. Excl. DPE H->WW: Event yield for L=30 fb-1ExhuMe 1.3 and new RP acceptances semi-lept fully-lept Mh[GeV] σXBR[fb] Acc.[%] cms atlas cms atlas Total 120 0.37 57 0.2 0 1.2 1 1.3 135 0.77 62 0.6 3.1 3.4 140 0.87 63 0.6 1 3.5 33.8 150 1.00 66 1.0 4.9 5.3 160 1.08 69 1.0 1 6.0 5 6.6 170 0.94 71 1.0 5.4 5.9 180 0.76 74 0.8 1 4.5 4 4.9 200 0.44 78 0.6 1 2.9 2 3.2

  21. Summary - Recent versions of DPEMC, EDDE and ExHuMe generators as well as new RP acceptances installed in cms fast simulation - Updated event yields for H->WW channel. They still may increase if the selection cuts are optimized. Bg for H->WW expected to be small. H->bb: selection cuts being optimized. LO+NLO bg under study - Hot topic these days: Which model gives the best description of data??? The problem is that the only data available are those of Rjj distr. from CDF. And these are very tricky… Very difficult to follow their procedure!

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