Mu+VBF Trigger Performance with 2017 data (DP 2020/014)

The following slides present the efficiency of a trigger targeting events with a soft muon (𝜇), two forward jets with a large invariant mass and moderate missing transverse momentum (MET or E_T^miss). This trigger is used in the context of search for supersymmetric particles produced through vector boson fusion (VBF) processes. The dataset analyzed corresponds to 36.7 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 (p_T) typically greater than 100 and 35 GeV, and a pair of jets with p_T > 35 GeV and an invariant mass (Mjj) greater than 620 GeV (L1_DoubleJet_100_35_DoubleJet35_Mass_Min620). The High Level Trigger condition requires the presence of two jets with p_T greater than 40 GeV, a pseudorapidity difference (∆𝜂jj) greater than 3.5, and an invariant mass greater than 750 GeV. It also requires the scalar sum of the p_T of all the jets, H_T 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. Events are selected from a sample collected with a single muon trigger (HLT_IsoMu27). The offline muon passes the tight identification and working point for Particle-Flow isolation [1]. The offline reconstructed jets are not matched to the jets on trigger level. 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, except in Fig. 5.

Finally the figures also indicate the inclusive efficiency of 98.3% for the full set of cuts in the table below. Other details can be found in the DPS note.

[1] CMS Collaboration, “Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at √s = 13 TeV”, JINST 13 (2018) P06015, doi:10.1088/1748-0221/13/06/P06015, arXiv:1804.04528

Efficiency vs 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. Online and offline jets are not matched. 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 (60) 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

Efficiency vs 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. Online and offline jets are not matched. 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 (60) GeV, abs(𝜂) < 5.0, 𝜂jet1∙𝜂jet2 < 0, ∆𝜂jj > 3.6, Mjj > 1000 GeV, and ETmis > 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

Efficiency vs 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. Online and offline jets are not matched. 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 (60) 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

Efficiency vs 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. Online and offline jets are not matched. 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 (60) 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 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

Efficiency vs 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. Online and offline jets are not matched. 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 (60) 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 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

-- ElisabettaGallo - 2020-03-22