Abstract
We investigate the physics case for a dedicated trigger on a low mass, hadronic displaced vertex at the high luminosity LHC, relying on the CMS phase II track trigger. We estimate the trigger efficiency with a simplified simulation of the CMS track trigger and show that the L1 trigger rate from fake vertices, B meson decays and secondary interactions with the detector material can likely be brought down to the kHz level with a minimal set of cuts. While it would with any doubt be a severe experimental challenge to implement, we conclude that a displaced vertex trigger could open qualitatively new parameter space for exotic Higgs decays, exotic B decays and even direct production of light resonances. We parametrize the physics potential in terms of a singlet scalar mixing with the Standard Model Higgs and an axion-like particle with a coupling to gluons, and review a number or relevant models motivated by the hierarchy and strong CP problems, Dark Matter and baryogenesis.
Highlights
With its high luminosity upgrade, the LHC will be capable of delivering up to 7 times its current luminosity to ATLAS and CMS, which implies a corresponding increase of the number pile-up vertices per bunch crossing
We parametrize the physics potential in terms of a singlet scalar mixing with the Standard Model Higgs and an axion-like particle with a coupling to gluons, and review a number or relevant models motivated by the hierarchy and strong CP problems, dark matter and baryogenesis
As we showed in the previous section, if a displaced vertex could be reconstructed at the trigger level, the HT > 100 GeV requirement used in [3,4,5, 7] may no longer be needed to bring the background rate down to a manageable level
Summary
With its high luminosity upgrade, the LHC will be capable of delivering up to 7 times its current luminosity to ATLAS and CMS, which implies a corresponding increase of the number pile-up vertices per bunch crossing. II, the spontaneous and/or explicit breaking of the approximate Z2-symmetry S → −S induces a mixing between the S and the SM Higgs, parametrized by the mixing angle θ The latter sets the lifetime of the singlet, which has a dominant branching ratio into hadrons in most of the parameter space. This benchmark value for the exotic Higgs branching ratio will be difficult to exclude just with precision measurements of the Higgs couplings at the HL LHC [24,25,26].
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