1 06/2/2007 tth, (h → bb): Cuts-Based analysis status/progress Chris Collins-Tooth 06-Feb-2007.

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Presentation transcript:

1 06/2/2007 tth, (h → bb): Cuts-Based analysis status/progress Chris Collins-Tooth 06-Feb-2007

2 06/2/2007 Samples Using Common Analysis, v (see TWiki) - ttH_rootples_Example_Analysis Signal tth(h → bb): 5340 (forced l + ) 5341 (forced l - ) Backgrounds used: 5855 AcerMC gg->ttbb (QCD) 5214 AcerMC gg->ttbb (EW) 5212 ttjj (jj=bb removed).

3 06/2/2007 Cuts Used (see v ) Lepton: –e  : Pt>25 GeV; EtCone<15 GeV;isEM 0x4FF; auth=1||3. –.  Staco : Pt>20 GeV;   /dof<50 < ; EtCone40<50 GeV. Jets:  6j; Pt>20 GeV; |  |<5. bJets:  4bj; bjetWeight  5. Neutrino Solution: use colinear appx if no solution. Sample 5212 (ttjj) only: remove if  4 unique bquarks M W lep/had : 80.4  25 GeV. M t : 175  20 GeV. Background + Combinatorics: P t  (J1 2 +J2 2 ) >75 GeV (see later)......

4 06/2/2007 Signal and BG Efficiencies. Latest “full sim” is Compared to Cammin [ATL-PHYS ] Applied same cuts as Cammin and saved v On the whole encouraging. Problem with ttjj many events had >=4 unique b-quarks Had to remove them, as ttjj(jj=bb)  ttbb

5 06/2/2007 Signal and BG Efficiencies. higher jet mult. in Latest “full sim” is Compared to Cammin [ATL-PHYS ] Applied same cuts as Cammin and saved v On the whole encouraging. Problem with ttjj many events had >=4 unique b-quarks Had to remove them, as ttjj(jj=bb)  ttbb

6 06/2/2007 Signal and BG Efficiencies. cut on 2 tops too harsh? higher jet mult. in Latest “full sim” is Compared to Cammin [ATL-PHYS ] Applied same cuts as Cammin and saved v On the whole encouraging. Problem with ttjj many events had >=4 unique b-quarks Had to remove them, as ttjj(jj=bb)  ttbb

7 06/2/2007 Signal and BG Efficiencies. cut on 2 tops too harsh? higher jet mult. in Latest “full sim” is Compared to Cammin [ATL-PHYS ] Applied same cuts as Cammin and saved v On the whole encouraging. Problem with ttjj many events had >=4 unique b-quarks Had to remove them, as ttjj(jj=bb)  ttbb 25% 47% 15% 30% 17% 47%

8 06/2/2007 Look at signal and BG normalised to 30 fb -1 –Problem: BG samples not big enough! Use AF? –No sensible distributions yet! – Can’t do shape analysis! Moving on.....

9 06/2/2007 Optimisations/Cuts.. Lots of cut optimisations to consider; also new cuts like P t  (J1 2 +J2 2 ) >75 GeV on bJets forming Higgs  I will add this cut to the CVS-based analysis

10 06/2/2007 A Cut: Pt  (J1 2 +J2 2 ) >70 GeV on bJets forming H Red circles: signal (+ black dot = “correct” bjets). Others: backgrounds #5340 poslep#5341 neglep Pt J2 Pt J1 Pt J2 #5855 ttbb[QCD] #5214 ttbb[EW]#5212 ttjj

11 06/2/2007 “Higgs bJets”: order by bjetWeight Currently, analysis in CVS produces Higgs from highest Et bJets if >2 remain after t/tbar. Tried using bjetWeight to order the jets if >2 “left over”. No difference really, as most (~99%) of the selected events have only 2 bJets! –we have to improve how we reconstruct the tops to beat combinatorics!

12 06/2/2007 Common Analysis: things I don’t like... Removal of ttjj where jj=bb –Truly awful to devise algorithm to do this in tthhbbClass.cxx (!) –Settled on removing events with 4 or more UNIQUE TRUTH b-quarks in ttjj. –Typical Herwig b->bMeson->b : check mother, grandmother etc. to see if b is unique –We also see eg: b-g-g-g-g-g-bbar where ‘b’ is mother of ‘bbar’, and ‘b’ has no mother. –Output ntuple ‘improved-data’ has a new attribute to allow one to remove these events for ttjj: “my_truthUniqueBQuarks” (remove ttjj event if >=4). –doplots.C is a root macro in CVS and cuts out these events runtth.sh makes 10 ntuples for samples 5212 –the list of input files is too large for my shell (zsh) –these have to be merged manually into “5212All.root” merge: TChain ch("improved-data"); ch.Add("5212*.root"); ch.Merge("5212All.root"); top-mass window seems too harsh. jet calibration.. is it even done??

13 06/2/2007 Other things to implement Add soft muons(+ ??) back to Jets. Jet energy corrections based on v12. See if there’s any way of improving combinatorics.  =0, instead of colinear solution. Improve W had light jets (use 3+ jets?- Simon?). S/BG discrimination with Neural Net (Helen). Bill’s fitting code. Others people would like to see / I have forgotten?? Volunteers????? Not enough events for a BG shape analysis.