HLT Dimuon Invariant Mass Distributions in 2017 and 2018 ( CMS DP-2018/055)

Dimuon invariant mass distributions for events recorded in 2017 and 2018 and reconstructed in the CMS High Level Trigger system are shown. Events are recorded largely unconstrained by requirements on muon kinematics otherwise imposed by CMS data acquisition and event reconstruction workflows. For low invariant mass dimuon events the data taking efficiency is improved by one or two orders of magnitude.

Since July 2017, CMS records inclusively events with two muons reconstructed in the CMS High Level Trigger (HLT) system:

  • Events are required to have two muons with pT > 3 GeV and abs(η) < 2.4
  • Events are required to pass the CMS Level-1 trigger decisions of a set of muon Level-1 trigger algorithms.
  • The muons can be displaced by up to about 10 cm

    Event information reconstructed at HLT is stored, allowing events to be recorded at a rate of up to 3 kHz for instantaneous luminosities of 20 Hz nb-1.

    For the plots shown below, the two highest pT muons in the event are considered and loose selection requirements are imposed:

  • The vertex reconstructed from the dimuon system is required to be within 2 mm in the transverse plane of the primary collision vertex in the event
  • Tracks associated to the muons are required to have at least one hit in the pixel detector and overall at least 5 hits in the CMS tracker
  • The two muons are required to have opposite sign.


    CMS_HLT_DimuonMass_PerL1_2017.png Dimuon invariant mass spectra reconstructed in the High Level Trigger system of the CMS detector for various muon Level-1 trigger requirements deployed by the CMS collaboration in 2017. For a subset of Level-1 requirements CMS recorded only a fraction of the data. Well known dimuon resonances from meson or Z boson decays are indicated. A small excess of events around 330 MeV corresponds to ɸ→K+K- decays where Kaons are misidentified as prompt muons.
    [Get pdf version]
    Contact: Jakob Salfeld-Nebgen

    CMS_HLT_DimuonMass_Inclusive_2017.png Dimuon invariant mass spectrum reconstructed in the High Level Trigger system of the CMS detector for data collected in 2017. Well known dimuon resonances from meson or Z boson decays are indicated. A small excess of events around 330 MeV corresponds to ɸ→K+K- decays where Kaons are misidentified as prompt muons.
    [Get pdf version]
    Contact: Jakob Salfeld-Nebgen

    CMS_HLT_DimuonMass_PerL1_2018.png Dimuon invariant mass spectra reconstructed in the High Level Trigger system of the CMS detector for various muon Level-1 trigger requirements deployed by the CMS collaboration in 2018. For a subset of Level-1 requirements CMS recorded only a fraction of the data. Well known dimuon resonances from meson or Z boson decays are indicated. A small excess of events around 330 MeV corresponds to ɸ→K+K- decays where Kaons are misidentified as prompt muons.
    [Get pdf version]
    Contact: Jakob Salfeld-Nebgen

    CMS_HLT_DimuonMass_Inclusive_2018.png Dimuon invariant mass spectrum reconstructed in the High Level Trigger system of the CMS detector for data collected in 2018. Well known dimuon resonances from meson or Z boson decays are indicated. A small excess of events around 330 MeV corresponds to ɸ→K+K- decays where Kaons are misidentified as prompt muons.
    [Get pdf version]
    Contact: Jakob Salfeld-Nebgen

    -- ElisabettaGallo - 2018-10-09

  • Topic attachments
    I Attachment History Action Size Date Who Comment
    PDFpdf CMS_HLT_DimuonMass_Inclusive_2017.pdf r1 manage 27.4 K 2018-10-09 - 14:37 ElisabettaGallo  
    PNGpng CMS_HLT_DimuonMass_Inclusive_2017.png r1 manage 20.5 K 2018-10-09 - 14:37 ElisabettaGallo  
    PDFpdf CMS_HLT_DimuonMass_Inclusive_2018.pdf r1 manage 27.4 K 2018-10-09 - 14:37 ElisabettaGallo  
    PNGpng CMS_HLT_DimuonMass_Inclusive_2018.png r1 manage 20.3 K 2018-10-09 - 14:37 ElisabettaGallo  
    PDFpdf CMS_HLT_DimuonMass_PerL1_2017.pdf r1 manage 198.8 K 2018-10-09 - 14:37 ElisabettaGallo  
    PNGpng CMS_HLT_DimuonMass_PerL1_2017.png r1 manage 44.9 K 2018-10-09 - 14:37 ElisabettaGallo  
    PDFpdf CMS_HLT_DimuonMass_PerL1_2018.pdf r1 manage 151.0 K 2018-10-09 - 14:37 ElisabettaGallo  
    PNGpng CMS_HLT_DimuonMass_PerL1_2018.png r1 manage 41.8 K 2018-10-09 - 14:37 ElisabettaGallo  
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    Topic revision: r4 - 2020-12-31 - JakobSalfeld
     
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