1. 2016 MET triggers for VH analysis
Carlos Miguel Vergel-Infante
ISU HEP EXP Group Meeting – Focus Talk
September -, 2016

2. From Oral Prelim (Fall ‘16)
Most probable for SM H decay
The SM predicts the BFs for the Higgs.
The decay H->bb decay has not been observed yet.
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
First observation of H

3. VH->bb
Leptonic decays of W and Z bosons will reduce the amount of QCD background.
Three channels (should be named “* charged lepton”):
0 Lepton (Z->vv)
1 Lepton (W -> lv)
2 Lepton (Z -> ll)
Improve sensitivity of H by improving the b-tagging of jets in the merged region (CM Frame) <-> GOAL
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

4. Collaboration A group in ATLAS has been working for a long time.
A paper is being prepared (~ summer ‘17) with data 15 and 16.
Joining the effort -> full run 2.
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

5. 2016 MET triggers as function of PU
Two MET triggers used in 2016:
HLT_xe90_mht_L1XE50 : Period A-D3
HLT_xe110_mht_L1XE50 : Period D4-…
Goals:
Turning curves of triggers.
Function of PU?
MET triggers do not use muon spectrometer information. Correction is done offline. (METnm).
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

6. W(munu) + jets sample
This sample has enough statistic to do the study, and already includes a muon.
CUTS:
Pass 1-lepton triggers
0 b-tag
Exact 1 muon
MET > 50 GeV
2, 3 jets
MPT > 30 GeV
>= 2 Signal Jets
(sumPt > 120 (150) GeV)
J1_pt > 45 GeV
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

7. Period A-D3 Usually, the cut is applied at 150 GeV
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
Usually, the cut is applied at 150 GeV

8. Pile-up : Period A-D3 Smaller μ has greater efficiency as expected.
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
Smaller μ has greater efficiency as expected.
Lumi = 6.12/fb

9. Period D4-… Usually, the cut is applied at 150 GeV
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
Usually, the cut is applied at 150 GeV

10. Pile-up : Period D4-… Smaller μ has greater efficiency as expected.
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
Smaller μ has greater efficiency as expected.
Lumi = 27.14/fb

11. Conclusions & to-do As expected, less pile-up gives better efficiency.
Do the same for ttbar (big background).
Present on Monday on the VHbb meeting.
Start working with merged jets.
2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

12. Back up 2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

13. Slopes Period A-D3 Period D4-… 2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante
Period D4-…

14. Period A-D3 2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante

15. Period D4-… 2016 MET triggers for VH analysis
(ATLAS) Carlos Vergel-Infante