Exclusive DPE Higgs generators in fast CMS simulation

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-gtWW
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 lt ?jet lt 1
1 lt ?jet lt 2
2 lt ?jet lt 3
?jet gt 3
5
New RP acceptances for ß0.55m

• Update of RP acceptances for recent LHC optics
• (V.Avati and K.Osterberg from Totem exp.)
• V6.5 V6.2
• ß0.55m 0.5m
• x500µm 0 µm
• Beam X-angle142 µrad 150 µrad
• Proton trajectories simulated with MADX
• These acceptances recently put in FAMOS.
• A check performed with flat input ?, t and f
• distributions.

6
New RP acceptances check with flat inputs
7
Mh acceptance
8
H-gtbb, mh120 GeV Protons
9
H-gtbb, mh120 GeV Protons
10
H-gtbb, mh120 GeV Higgs
11
H-gtbb, mh120 GeV b-quarks after FSR
12
H-gtbb, mh120 GeV hadron level
13
H-gtbb, mh120 GeV detector level
14
H-gtbb, mh120 GeV detector level b-jets
15
H-gtbb, mh120 GeV detector level
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ExHuMe H-gtWW, mh140 GeV leptons
17
ExHuMe H-gtWW, mh140 GeV quarks
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Excl.DPE H-gtbb Event yields per L30 fb-1

• Selection cuts at detector level for mh120 GeV
• 0) Both protons accepted in one of two (220,420)
  RP stations
• Njet gt 1
• 2) 45 lt Etj1JESCor lt 85 GeV, Etj2JESCor gt 30
  GeV
• 3) ?j1,2 lt 2.5
• 4) ?j1-?j2 lt 0.8
• 5) 2.8 lt fj1-fj2 lt 3.48
• 6) Mj1j2/Mtot gt 0.75
• 7) Mj1j2/Mmiss.mass gt 0.8
• 8) Npart(3lt?lt6) 0
• 9) 118 lt Mmiss.mass lt 122 GeV
• Generator sxBRfb Acc1Acc2gt0 gg-gtH-gtbb
  gg-gtbb gg-gtgg
• DPEMC 2.27 50 ?
  
• EDDE 1.94 46 ?
  
• ExHuMe 1.87 57 ?
  

No b-tagging yet!
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BG to H-gtbb Excl.DPE gg-gtbb, gg-gtgg

• The main problem Large cross sections require
  large statistics to get reliable predictions.
  More than 1 mil.events analyzed!
• gg-gtbb
• DPEMC ptmin30GeV 7.9 ev., ptmin40GeV 7.3
  ev. -gt7.8 ev
• ExHuME theta_minacos(0.75), 60ltMlt200 3.1 ev.
• theta_minacos(0.65), 60ltMlt200 2.1
  ev.
• theta_minacos(0.55), 60ltMlt200 2.8
  ev. -gt2.7 ev
• theta_minacos(0.55), 70ltMlt200 2.8
  ev.
• EDDE ptmin30GeV 0.36 ev., ptmin40 GeV 0.63
  ev. -gt 0.6 ev
• gg-gtgg
• DPEMC ptmin30GeV 0.9 ev.
  -gt 0.9 ev.
• ExHuME theta_minacos(0.55), 60ltMlt200 2.4 ev.
• theta_minacos(0.65), 60ltMlt200 2.4
  ev. -gt 2.4 ev.
• EDDE ptmin30GeV 0.12 ev., ptmin40GeV 0.21
  ev. -gt 0.2 ev

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Excl.DPE H-gtWWEvent yields per L30 fb-1

• Both protons accepted in one of two RPs (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 (ptgt29 GeV, ?lt2.5) or 1µ (ptgt14 GeV,
  ?lt2.1) or
• 1e (ptgt20 GeV, ?lt2.5) 2 quarks
  (ptgt25GeV,?lt5) or
• 1µ (ptgt10 GeV, ?lt2.1) 2 quarks (ptgt25GeV,
  ?lt5)
• Fully leptonic W decay
• 2e (ptgt17 GeV, ?lt2.5) or 2µ (ptgt3 GeV, ?lt2.1)
  or
• eµ (ptegt17 GeV, ?lt2.5 and ptµgt3 GeV, ?lt2.1)
  or
• 2e (ptmaxgt29 GeV,?lt2.5) or 2µ (ptmaxgt14
  GeV,?lt2.1) or
• eµ (ptegt29 GeV, ?lt2.5 or ptµgt14 GeV, ?lt2.1)

21
Excl. DPE H-gtWW Event yield for L30 fb-1ExhuMe
1.3 and new RP acceptances

• 
  semi-lept fully-lept
• MhGeV sXBRfb 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 3 3.8
• 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

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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-gtWW channel.
  They still may increase
• if the selection cuts are optimized. Bg
  for H-gtWW expected to be
• small.
• H-gtbb selection cuts being optimized.
  LONLO 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!