Performance Study on High Level Trigger for Vector Boson Fusion Process in CMS Run 3 Data at √s = 13.6 TeV

The Compact Muon Solenoid (CMS) comprises a two-level trigger system that selects and stores potentially interesting proton-proton collision events in light of reducing a large fraction of well-known background and efficiently managing the data produced at the Large Hadron Collider (LHC). This poster presents a study on the online High Level Trigger (HLT) system at CMS and its event selection performance on Vector Boson Fusion (VBF) Higgs production mechanism in Run3 of the LHC in the year of 2023 with integrated luminosity of 13 fb^-1. Specifically, the efficiency study is done on the recently introduced event-level trigger paths characterized by the dijet invariant mass m_jj and the relative pseudorapidity Δη criteria of multijet events. 2023 Run3 SingleMuon datasets are employed with kinematic cuts applied on the transverse momentum of leading and sub-leading jets (p_T1, p_T2), m_{jj, and} Δη matching the trigger path algorithm, as well as calorimeter energy fractions and muon property cuts for well-defined event selection. With selected offline reconstructed events serving as the baseline, efficiency is obtained by taking the ratio of the number of events captured by VBF trigger paths to that of offline reconstructed events that are ideally accepted by the trigger path. Accurate and efficient performance of HLT on VBF trigger path will facilitate both the Standard Model studies and Beyond Standard Model (BSM) searches including Soft Unclustered Energy Pattern (SUEP) process.