Update on the HZZ 250 GeV +80/-30 250/fb Analysis for 17-19 September 2013:

Analysis Procedure:

  • divide into 4 jet / 6 jet topologies
    • this is ZH with H->ZZ* , Z-> nn,ll,qq
  • apply preselection depending on topology
  • train/apply TMVAs
  • validate with cut table
  • check remaining backgrounds

Distributions before preselection with only a cut on the reconstructed Higgs mass:





Preselection:

Simplified and making only clean cuts ...

Evis<140.0: (4 Jet category)
#y34>0.0#hmass>95. && hmass<140.
#PTvisJETS>25.0 && PTvisJETS<70.0
#nTrks>5.
#ej1<120.

Evis>140: (6 jet category)
#y34>0.0
#hmass>90. && hmass<160.
#ej1<120.
#jetthrust<0.98
#nTrks>5

Distributions after preselection:




(Note: the lepton pair mass plot has the entries at less than 10 GeV randomly set to 10 and 130 GeV so that the signal peak can be seen.)

The TMVA variables:

  1. Evis JETS
  2. Mvis JETS
  3. PTvis JETS
  4. B Likeness
  5. C likeness
  6. Number of HE Electrons
  7. Higgs Mass
  8. Z energy
  9. Zstr energy
  10. Z cos theta
  11. Zstr cos theta
  12. Z mass
  13. Zstr mass
  14. azimuthal separation of Z jets
  15. thrust
  16. Number Charged Tracks
  17. Number of electrons
  18. Number of muons

----NEW VARIABLES:

  1. y34
  2. y56
  3. lepton pair (PDG ID1 = -ID2) mass closest to Mz
  4. jet pair mass closest to mW

  5. jet pair1 - mW

    +

    jet pair2 - mW

Some signals are just not reasonable to try to select:

1) decays like l+l-H where H->ffnunu
Even in cases where the ff are leptons the initial l+l- are more energetic
and those were being selected.

eeH, H -> cc ee

nu nu H, H -> nu nu nu nu

nu nu H, H -> nu nu nu nu

 

 

HZZ generated sample stats

 

 

 

 

 

 

 

 

 

events

weight

 

I108056.001.stdhep

10000

20000

1.29E-004

e1e1h_zz.Gwhizard-

I108055.001.stdhep

10000

20000

4.36E-003

e1e1h_zz.Gwhizard-

I108054.001.stdhep

10000

20000

4.11E-004

e1e1h_zz.Gwhizard-

I108053.001.stdhep

10000

20000

2.70E-005

e1e1h_zz.Gwhizard-

I108058.001.stdhep

10000

20000

4.29E-003

e2e2h_zz.Gwhizard-

I108057.001.stdhep

10000

20000

4.00E-004

e2e2h_zz.Gwhizard-

I108060.001.stdhep

10000

20000

4.28E-003

e3e3h_zz.Gwhizard-

I108059.001.stdhep

10000

20000

4.00E-004

e3e3h_zz.Gwhizard-

 

 

Sum =

1.43E-002

10.40%

I108062.001.stdhep

10000

20000

2.54E-002

nnh_zz.Gwhizard-1_

I108061.001.stdhep

10000

20000

3.01E-003

nnh_zz.Gwhizard-1_

 

 

Sum =

2.84E-002

20.68%

I108064.001.stdhep

10000

20000

8.67E-002

qqh_zz.Gwhizard-1_

I108063.001.stdhep

10000

20000

8.08E-003

qqh_zz.Gwhizard-1_

 

 

Sum =

9.47E-002

68.93%

 

 

 

 

 

 

 

 

 

 

 

 

All =

1.37E-001

 

Mass of lepton pair with mass closest to mZ:

The following also shows the jet pair mass for those that have mass closest to mW:

Note: Compared to last week plots and tables there was also a simple programming error which I've already fixed.

Performance of different MVA options:

BEFORE

 [neal@localhost weights]$ grep -A 8 -i optimal- ../hzzv14-presel-v4-new-common0410results.txt
 --- Classifier   (  #signal, #backgr.)  Optimal-cut  S/sqrt(S+B)      NSig      NBkg   EffSig   EffBkg
 -- ---------------------------------------------------------------------------------------------
 ---       Cuts:  ( 664.0744,1312202.5)      -0.0050            0         0         0        0        0
 --- Likelihood:  ( 664.0744,1312202.5)       1.0000     0.728991  644.0848  779980.1   0.9699   0.5944
 ---     Fisher:  ( 664.0744,1312202.5)       0.0120      1.70335  258.2099  22721.13   0.3888  0.01732
 ---       BDTG:  ( 664.0744,1312202.5)      -0.9823      1.17754  538.5353  208621.3    0.811    0.159
 ---        BDT:  ( 664.0744,1312202.5)      -0.0462      3.42709  100.6751  762.2891   0.1516 0.0005809
 -- ---------------------------------------------------------------------------------------------

NOW:

     if ((fp = fopen("HZZ-TMVA-vars-ffh_zz_all_SM_background_+80e-_-30e+-v6-mini.txt","r"))==NULL) exit(0);
[neal@localhost test]$ source storeresultsHZZv4.sh hzz-withlep-withmW-n2-Mhiggspresel-plusptntrkp8g16y34nvtx


--- ==================================================================================================
--- Classifier   (  #signal, #backgr.)  Optimal-cut  S/sqrt(S+B)      NSig      NBkg   EffSig   EffBkg
--- --------------------------------------------------------------------------------------------------
---       Cuts:  (1035.8644,  1196975)      -0.0050            0         0         0        0        0
--- Likelihood:  (1035.8644,  1196975)       1.0000      1.66886  315.8824  35510.98   0.3049  0.02967
---     Fisher:  (1035.8644,  1196975)       0.0047      2.38122  586.8862  60157.76   0.5666  0.05026
---       BDTG:  (1035.8644,  1196975)      -0.9795        2.625  293.8675  12238.81   0.2837  0.01022
---        BDT:  (1035.8644,  1196975)      -0.0427       4.9889  146.0711  711.2005    0.141 0.0005942
--- --------------------------------------------------------------------------------------------------
                                                          ^^^^^^

BDT plots:



Cut table for BDT: (NEW)NEW:

 cuts__ (Cut Name                          ):       all   others        2f       4f       6f       aa       1f       3f       5f        q      e+mu      tau       nu  Signif.
 cut #0 (all                               ): 7.769e+07   625000  14507062  1019938        0 54073784        0  7464875        0       948       91       45      262      0.15  Delta(sig*BR) = 6.548594 +/-  0.046879
 cut #1 (y34>0.y34>0.                      ): 7.705e+07   625000  14449800  1018312        0 53568784        0  7387500        0       947       91       45      262      0.15  Delta(sig*BR) = 6.523157 +/-  0.046724
 cut #2 (95.<hmass<140. 95.<hmass<140.     ): 1.257e+07    150000 10264438   825238        0   387992        0   938000         0      901       86       43      213      0.35  Delta(sig*BR) =  2.854636 +/- 0.021075
 cut #3 (25.<PTvisJETS<70 PTvisJETS no cut ): 5.637e+06    25000   4545812   744212        0     8750        0   312125        0       866       84       37      180      0.49  Delta(sig*BR) = 2.033046 +/-  0.015436
 cut #4 (nTrks>5 nTrks>5                   ): 3.826e+06        0   2957175   679838        0     8750        0   179500        0       866       81       36      176      0.59  Delta(sig*BR) = 1.688536 +/-  0.012688
 cut #5 (jetthrust no cut jetthrust < 0.98 ): 3.826e+06        0   2957175   679838        0     8750        0   179500        0       866       81       36      176      0.59  Delta(sig*BR) = 1.688536 +/-  0.012688
 cut #6 (ej1<120. ej1<120.                 ): 2.144e+06        0   1480162   539312        0     8750        0   114500        0       844       78       35      176      0.77  Delta(sig*BR) = 1.292336 +/-  0.009952
 cut #7 (MVA                               ): 9.252e+02        0        50      712        0        0        0        0        0       79        27        3       53      5.35  Delta(sig*BR) = 0.186991 +/- 0.010382

Remaining backgrounds: (NEW)

$ sed 's/\./,/g' zzhpassing.dat | awk '{if (NF==18) print $3,$7,$15}' | sort -n | uniq -c | awk '{if (NF==4) aa+=($1*$4);print $1*$4"\t"$0} END{print "Sum of weights = "aa}' | sort -k 1,1 -n
Sum of weights = 762,5
12,5          1 106561 4f_sz 12,500000
12,5          1 106564 4f_sw 12,500000
12,5          1 106573 4f_zz 12,500000
12,5          1 106580 4f_zz 12,500000
12,5          1 106607 2f_z_ 12,500000
25            2 106551 4f_ww 12,500000
25            2 106562 4f_sz 12,500000
37,5          3 106575 4f_zz 12,500000
37,5          3 106608 2f_z_ 12,500000
50            4 106578 4f_ww 12,500000
62,5          5 106572 4f_sz 12,500000
100           8 106574 4f_zz 12,500000
125          10 106577 4f_ww 12,500000
237,5        19 106576 4f_zz 12,500000  <----

Plans:

  • just noticed that the preselection nTrks cut is on the PFO count and not the #charged tracks distribution shown so I will switch to
    using the charged tracks count in the preselection
  • may still be able to do better with the leptonic Z decay selection
    • high evis events with well reconstructed leptonic Z decays and a clear 6 jet topology (using y56 cut)
  • write report
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