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Boosted Decision Trees for Supersymmetry Searches. Timothy Brooks Year 1 PhD Student Royal Holloway University of London. Boosted Decision Tree Separation. SU4 mSUGRA Point Backgrounds considered: Ttbar production W+Z production Comparisons made to Multi-lepton cuts.

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boosted decision trees for supersymmetry searches

Boosted Decision Trees for Supersymmetry Searches

Timothy Brooks

Year 1 PhD Student

Royal Holloway University of London

boosted decision tree separation
Boosted Decision TreeSeparation

SU4 mSUGRA Point

Backgrounds considered:

Ttbar production

W+Z production

Comparisons made to Multi-lepton cuts.

Precut requires NLeptons >= 3

Trained on full MC sample (without cuts) to maximise training sample.

400 trees used here.

s = 63.4

b = 32.8

Z = 8.96

boosted decision tree significance
Boosted Decision TreeSignificance

5 σ excess at 31.15 pb-1

Effect of over boosting investigated.

Significance estimation needs to include background uncertainties.

Need to move to Di-lepton + 4 jet analysis.

Aim is to investigate if a BDT run on control and expected signal regions can extract the top component in the signal region.

To recover higher statistics, channels with jet multiplicities lower than 4 will be investigated.

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