CMS Mu+VBF Trigger Performance with 2017 Data

A study of events with low momentum leptons at the CERN LHC is crucial in search for Supersymmetry (SUSY) where the mass difference between the lightest SUSY particles (LSP) and next to the lightest SUSY particles (NLSP) is small (mass degenerate). CMS, one of the two general purpose experiments at the LHC, developed and commissioned a dedicated a low transverse momentum ($p_{T}$) single muon trigger with two jets in vector-boson fusion (VBF) topology during Run 2 of the LHC. The performance is evaluated using the data sample collected by the CMS detector in proton-proton collisions at center of mass energy of 13 TeV and corresponding to an integrated luminosity of 8.7 fb$^{-1}$. These results include the efficiencies as a function of various variables reconstructed with the offline version of the CMS software. The efficiency of the hadronic part of the trigger is $98.4\%$ for events containing a triggered muon and two jets that pass the VBF selection criteria, with the leading (sub-leading) jet $p_{T} > 120 (50)$ GeV, jet pseudorapidity $\vert{\eta}\vert < 5.0$, and missing transverse momentum (MET) $ < 150$ GeV. The VBF trigger allows lowering the MET threshold from 250 GeV.