search for higgs to dimuons · dpf meeting july 31, 2017 search for higgs to dimuons sergei v....
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![Page 1: Search for Higgs to Dimuons · DPF Meeting July 31, 2017 Search for Higgs to Dimuons Sergei V. Gleyzer on behalf of CMS Collaboration](https://reader034.vdocuments.us/reader034/viewer/2022042109/5e898d253246aa0d1449dc52/html5/thumbnails/1.jpg)
DPF Meeting July 31, 2017
Search for Higgs to Dimuons Sergei V. Gleyzer on behalf of CMS
Collaboration
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Outline • Run 1 H0 à µ+µ- Analysis • Run 2 H0 à µ+µ- Analysis
improvements
31/7/17 Sergei V. Gleyzer DPF Meeting 2
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Motivation
31/7/17 Sergei V. Gleyzer DPF Meeting 3
• Higgs couples to muons – Precise mass resolution – Test of direct coupling to fermions
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Run 1
31/7/17 Sergei V. Gleyzer DPF Meeting 4
• 5 fb-1 at 7 TeV + 19.7 fb-1 at 8 TeV • Search for a narrow peak in the di-
muon spectrum – Main backgrounds: Drell-Yan and ttbar
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Run 1
31/7/17 Sergei V. Gleyzer DPF Meeting 5
• Signal production: ggH and qqH
• Separate by jet multiplicity into exclusive categories to maximize sensitivity
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Object Selection
31/7/17 Sergei V. Gleyzer DPF Meeting 6
• Trigger – At least one isolated muon
• pT > 24 GeV • |η| ≤ 2.1
• Offline – “Triggered” muon pT > 25 GeV – Sub-leading pT > 15 GeV – Tight muon selection – Jet pt > 30 GeV, |η| < 4.7
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Run 1 Categories
31/7/17 Sergei V. Gleyzer DPF Meeting 7
• VBF Tight – pT
J(1,2) > 40, 30 GeV – Mjj > 650 GeV – bjet veto – Δη(1,2) > 3.5
• GF Tight – pT
J(1,2) > 40, 30 GeV – Mjj > 250 GeV – bjet veto – pTµµ > 50 GeV
• Muon Categories: – |η|< 0.8 (B); <1.6 (O) <2.4 (E)
• 2Jet Loose – pT
J(1,2) > 40, 30 GeV – bjet veto
• 0,1 Jet Tight – pTµµ > 25 GeV – bjet veto
• 0,1 Jet Loose – Fail all others
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Systematics
31/7/17 Sergei V. Gleyzer DPF Meeting 8
Link to paper
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Results
31/7/17 Sergei V. Gleyzer DPF Meeting 9
• Expected and observed limits
7.4 x SM
(6.5 + 2.8 -1.9)
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Run 2 Analysis
31/7/17 Sergei V. Gleyzer DPF Meeting 10
35.9 fb-1 at 13 TeV • Trigger – Isolated muon pT > 24 GeV
• Offline – 2 opposite sign muons – Triggered muon pT > 26 GeV – |η| < 2.4 – pT > 10GeV – Jets pT > 30GeV |η| < 4.7
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Analysis Improvements
31/7/17 Sergei V. Gleyzer DPF Meeting 11
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Muon Trigger
31/7/17 Sergei V. Gleyzer DPF Meeting 12
• Improved muon trigger – Machine learning algorithm trained to
better approximate muon momenta – Boosted regression trees encoded in
lookup table in FPGA
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Background Model
31/7/17 Sergei V. Gleyzer DPF Meeting 13
• FEWZ NNLO generator – better model the shape of the Drell-Yan
background – Reduce the systematic uncertainty
• Better agreement with the data
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Categorizer
31/7/17 Sergei V. Gleyzer DPF Meeting 14
• Use machine learning to find better categories – ~10% improvement in expected limits
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ML+ Categorizer
31/7/17 Sergei V. Gleyzer DPF Meeting 15
• Use machine learning upstream for event selection • Plus categorization – ~25% improvement in expected limits
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Results
31/7/17 Sergei V. Gleyzer DPF Meeting 16
• To be released in ~month
Stay Tuned
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Thank You
31/7/17 Sergei V. Gleyzer DPF Meeting 17
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31/7/17 Sergei V. Gleyzer DPF Meeting 18
Di-muon event