1. CMS-IHEP/Beijing weekly meeting
Work progress
J. Tao
CMS-IHEP/Beijing weekly meeting

2. Introduction Kine. Cut selection (irreducible bkgs)
JET/MET information
Photon Isolation: TMVA for NNiso
Event Optimization
Ongoing

3. gg fusion H→γγ cross section: 80.2 pb
Sig. counting calculation with only kinematic cut on irreducible bkgs: box & born
gg fusion H→γγ cross section: 80.2 pb
Photon PT Cut
Max. s/b (%)
LLR (1 fb^-1)
Scl
L needed by 5σ discovery(fb^-1)
Signal evt left (tot: )
Min.
Max. 20
8.7224
1.2488
1.5804
163930 30
8.9621
1.2752
1.5970
9.8023
162637 40
1.4265
1.6891
8.7628
155759 50
1.5737
1.7728
7.9548
139855
9.7149
1.2553
1.5845
9.9574
147021
1.3398
1.6369
9.3301
143470
1.4694
1.7143
8.5071
130229
1.1640
1.5258
115268
1.2237
1.5644
108658
0.7789
1.2482
66651 55
1.5808
1.7781
7.9072
125896 60
1.5510
1.7612
103282 25
1.5329
1.7509
8.1547
135957
1.5390
1.7544
8.1221
122457
22.5
1.4123
1.6806
8.8511
153520
1.5537
1.7628
8.0453
(54.54%)
1.5627
1.7679
7.9992
(49.11%)
1.5323
1.7506
8.1578
101942

4. Inv. Mass with only kin. cut
irreducible bkgs
all bkgs

5. Jets/MET information
PT of 2 highest PT jets except the jets including these two photons
Sun ET of all jets except the jets including these two photons
Used as inputs of Event Optimization training

6. PT fraction of photons in jets
Used as inputs of Photon Isolation training
selected two highest ET photons with PT>20 and |Eta|<2.5
When caculstion the PT fraction of photons in jets, using the jets which include the photons
Used as input of Event Optimization training

7. MET
Used as input of Event Optimization training

8. NNiso of Photon
Selection: ET>20GeV, |η|<2.5, 2 highest ET Reco. Photons
2 samples: signal (163932x2 γ) & Jets_Pt50up (100133x2) ( Photons candidates for training, rest for test)
Try 3 times in TMVA :
inputs :
inputs:
inputs:
, IBarrel(0,1), ICconverted (0,1),
, IBarrel(0,1), ICconverted (0,1),
, IBarrel(0,1), ICconverted (0,1),

9. NNiso : Signal eff v.s. bkg rejection

10. TMVA Isolation: BDT result (19 inputs)

11. TMV_BDT Isolation applied to all channels

12. TMVA for Event Optimization
Selection: ET>20GeV, |η|<2.5, 2 highest ET Reco. Photons
2 samples: signal (163930) & Jets_Pt50up (100133) (100000/70000 events for training, rest for test)
11 inputs :
NNiso1
NNiso2
Et1/M
Et2/M
|η1-η2|
PL of 2 Gamma
Max PT of Jets excluding the selected 2 photons
Second PT of Jets excluding the selected 2 photons
Sum PT of all Jets excluding the selected 2 photons
MET
Sum PT of the selected 2 photons over sum PT of 2 jets including the selected 2 photons

13. NN Optimization inputs (I)

14. NN Optimization inputs (II)

15. NN Optimization: inputs correlation - signal

16. NN Optimization: inputs correlation - Jets

17. NN Optimization: TMVA_BDT results

18. TMV_BDT Optimization applied to all channels

19. TMV_BDT Otimization cut on Inv. Mass: Signal
BDT out>0.6
82619/253191=32.64%
BDT out>0.6
PT1>40 & PT2>35

20. TMV_BDT Otimization cut on Inv. Mass (1 fb^-1)
BDT out>0.6
PT1>40 & PT2>35
With PTDR Cut-based
Jets: reduced
GammaJet:
1. Process production
2. Event Optimize training use only sig + jets
No stack

21. γ+ Jet
1. Brem.
PYTHIA : qg->gq, qq->gg with the second prompt photon selected. ISR/FSR
DIPHOX: qg->gq (q->gq’ brem.),
qg->gq (q->g fragmentation)
qq->gg (g->g fragmentation)
irreducible
PYTHIA : qg->gq with g + p0 signature. ISR/FSR; no mult. int.
DIPHOX: qg->gq at NLO with q->p0 fragmenation
2. g+j,jp0

22. Background: γ+ Jet

23. Ongoing TMVA Event Optimization
Selection: ET>20GeV, |η|<2.5, 2 highest ET Reco. Photons
Training with all samples: weighted event with 1 fb^-1
NNiso cut before optimization training (NN>-0.2)
11 inputs :
Question: Apply in the same sample: signal+backgrounds
NNiso1
NNiso2
Et1/M
Et2/M
|η1-η2|
PL of 2 Gamma
Max PT of Jets excluding the selected 2 photons
Second PT of Jets excluding the selected 2 photons
Sum PT of all Jets excluding the selected 2 photons
MET
Sum PT of the selected 2 photons over sum PT of 2 jets including the selected 2 photons
Ongoing

24. TMVA Opt. out v.s. NNiso1, NNiso2
Signal
GammaJet
Signal
GammaJet

25. Event Optimization inputs: All channels

28. Backup

29. PT/Eta of 2 highest PT jets except the jets including these two photons

30. # Rec. Jets including the Photon-jets

31. NN Isolation inputs (I)

32. NN Isolation inputs (II)

33. NN Isolation inputs (III)

34. NN Isolation inputs (IV)

35. NN Isolation inputs correlation: signal

36. NN Isolation inputs correlation: Jets