Mu+VBF Trigger Performance with 2017 Data (DP-2017/043)

The following plots present the efficiency of a trigger targeting events with a soft muon, 2 forward jets with a large invariant mass and moderate missing transverse momentum. This trigger is used in the context of search for supersymmetric particles produced through vector boson fusion processes. The dataset analyzed corresponds to 8.7 fb-1 of proton-proton collisions at √s = 13 TeV recorded in 2017.

The Level 1 condition of the trigger requires two jets with transverse momentum (pT) typically greater than 100 and 35 GeV and a pair of jets with pT > 35 GeV and an invariant mass greater than 620 GeV. The High Level Trigger condition requires the presence of two jets with pT greater than 40 GeV, a pseudorapidity difference greater than 3.5 and an invariant mass greater than 750 GeV. It also requires the scalar sum of the pT of all the jets to be greater than 300 GeV and at least 60 GeV of missing transverse energy when muons are omitted in the energy sum.

In the following plots, the efficiency is computed as a function of various variables reconstructed with the offline version of the CMS software. A common selection (summarized in the table below) is applied for all events entering the denominator. For each plot, only the cut on the variable under study is dropped.

The efficiency (black dots) is defined as the ratio of events firing the trigger (filled histogram) over the denominator (dashed blue histogram).

VBF Trigger Efficiency for abs(eta(jet))<5.0 versus ETmiss Trigger efficiency of VBF-tagged jets with a soft muon (pT(𝜇) > 8 GeV) in single muon data as a function of the offline missing transverse energy ignoring muons. Both offline and online jets are reconstructed with the Particle-Flow algorithm, where a jet is clustered with the anti-kT algorithm with distance parameter R = √𝜂2+𝜙2 of 0.4. The efficiency measured here is only the hadronic part of the VBF+𝜇 trigger. There is a HT dependence of trigger, causing slightly off from 1.
The denominator (dashed) is the number of events passing the single muon trigger (IsoMu27) which have at least one muon with pT > 30 GeV and abs(𝜂) < 2.4, and jets with the leading (sub-leading) pT > 120 (50) GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, ∆𝜂jj > 3.6, Mjj > 1000 GeV, and HT(abs(𝜂)<5.0) > 450 GeV. Here, HT is the scalar sum of the jet pT greater than 30 GeV. The numerator (filled) is the number of events passing all selections above and the VBF+𝜇 trigger (Mu8_TrkIsoVVL_DiPFJet40_DEta3p5_Mjj750_HTT300_PFMETNoMu60).
Efficiency (dots) = Numerator / Denominator.
[Get pdf version]
Contact: Minsuk Kim
imgabf6163240c408b574c03739dbcb001b.png

VBF Trigger Efficiency for abs(eta(jet))<5.0 versus HT
Trigger efficiency of VBF-tagged jets with a soft muon (pT(𝜇) > 8 GeV) in single muon data as a function of the offline HT defined by the scalar sum of the pT of the jets with pT > 30 GeV and abs(𝜂) < 5.0. Both offline and online jets are reconstructed with the Particle-Flow algorithm, where a jet is clustered with the anti-kT algorithm with distance parameter R = √𝜂2+𝜙2 of 0.4. The efficiency measured here is only the hadronic part of the VBF+𝜇 trigger.
The denominator (dashed) is the number of events passing the single muon trigger (IsoMu27) which have at least one muon with pT > 30 GeV and abs(𝜂)< 2.4, and jets with the leading (sub-leading) pT > 120 (50) GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, ∆𝜂jj > 3.6, Mjj > 1000 GeV, and ETmiss > 150 GeV. The numerator (filled) is the number of events passing all selections above and the VBF+𝜇 trigger (Mu8_TrkIsoVVL_DiPFJet40_DEta3p5_Mjj750_HTT300_PFMETNoMu60)
. Efficiency (dots) = Numerator / Denominator. [Get pdf version]
Contact: Minsuk Kim
img7a48ac5a5f158f32e1aa7ff79b5b46a4.png

VBF Trigger Efficiency for abs(eta(jet))<5.0 versus Mjj
Trigger efficiency of VBF-tagged jets with a soft muon (pT(𝜇) > 8 GeV) in single muon data as a function of the invariant mass of two jets. Both offline and online jets are reconstructed with the Particle-Flow algorithm, where a jet is clustered with the anti-kT algorithm with distance parameter R = √𝜂2+𝜙2 of 0.4. The efficiency measured here is only the hadronic part of the VBF+𝜇 trigger. There is a HT dependence of trigger, causing slightly off from 1.
The denominator (dashed) is the number of events passing the single muon trigger (IsoMu27) which have at least one muon with pT > 30 GeV and abs(𝜂) < 2.4, and jets with the leading (sub-leading) pT > 120 (50) GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, ∆𝜂jj > 3.6, HT(abs(𝜂)<5.0) > 450 GeV, and ETmiss > 150 GeV. Here, HT is the scalar sum of the jet pT greater than 30 GeV. The numerator (filled) is the number of events passing all selections above and the VBF+𝜇 trigger (Mu8_TrkIsoVVL_DiPFJet40_DEta3p5_Mjj750_HTT300_PFMETNoMu60).
Efficiency (dots) = Numerator / Denominator. [Get pdf version]
Contact: Minsuk Kim
imgcee1bc79d43ba536fdaefb5f7356d898.png

VBF Trigger Efficiency for abs(eta(jet))<5.0 versus Deltaetajj
Trigger efficiency of VBF-tagged jets with a soft muon (pT(𝜇) > 8 GeV) in single muon data as a function of the pseudorapidity difference between two jets. Both offline and online jets are reconstructed with the Particle-Flow algorithm, where a jet is clustered with the anti-kT algorithm with distance parameter R =√𝜂2+𝜙2 of 0.4. The efficiency measured here is only the hadronic part of the VBF+𝜇 trigger. There is a HT dependence of trigger, causing slightly off from 1.
The denominator (dashed) is the number of events passing the single muon trigger (IsoMu27) which have at least one muon with pT > 30 GeV and abs(𝜂) < 2.4, and jets with the leading (sub-leading) pT > 120 (50) GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, Mjj > 1000 GeV, HT(abs(𝜂)<5.0) > 450 GeV, and ETmiss > 150 GeV. Here, HT is the scalar sum of the jet pT greater then 30 GeV. The numerator (filled) is the number of events passing all selections above and the VBF+𝜇 trigger (Mu8_TrkIsoVVL_DiPFJet40_DEta3p5_Mjj750_HTT300_PFMETNoMu60).
Efficiency (dots) = Numerator / Denominator [Get pdf version]
Contact: Minsuk Kim
imgf0b30bb801baf61cf2ad561d4ced04c9.png

VBF Trigger Efficiency for abs(eta(jet))<5.0 versus subleading jet pt
Trigger efficiency of VBF-tagged jets with a soft muon (pT(𝜇) > 8 GeV) in single muon data as a function of the sub-leading jet pT. Both offline and online jets are reconstructed with the Particle-Flow algorithm, where a jet is clustered with the anti-kT algorithm with distance parameter R = √𝜂2+𝜙2 of 0.4. The efficiency measured here is only the hadronic part of the VBF+𝜇 trigger. There is a HT dependence of trigger, causing slightly off from 1.
The denominator (dashed) is the number of events passing the single muon trigger (IsoMu27) which have at least one muon with pT > 30 GeV and abs(𝜂) < 2.4, and jets with the leading pT > 120 GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, ∆𝜂jj > 3.6, Mjj > 1000 GeV, HT(abs(𝜂)<5.0) > 450 GeV, and ETmiss > 150 GeV. Here, HT is the scalar sum of the jet pT greater then 30 GeV. The numerator (filled) is the number of events passing all selections above and the VBF+𝜇 trigger (Mu8_TrkIsoVVL_DiPFJet40_DEta3p5_Mjj750_HTT300_PFMETNoMu60).
Efficiency (dots) = Numerator / Denominator. [Get pdf version]
Contact: Minsuk Kim
img22b9ed386f650c02cd86754a6d65896c.png

-- ElisabettaGallo - 2017-10-19

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