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Phys Rev Lett. 2019 Apr 5;122(13):131801. doi: 10.1103/PhysRevLett.122.131801.

Enhancing Long-Lived Particles Searches at the LHC with Precision Timing Information.

Liu J1, Liu Z2,3, Wang LT1,4.

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Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.
Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA.


We explore the physics potential of using precision timing information at the LHC in searches for long-lived particles (LLPs). In comparison with the light standard model particles, the decay products of massive LLPs arrive at detectors with time delays around the nanosecond scale. We propose new strategies to take advantage of this time delay feature by using initial state radiation to time stamp the collision event and require at least one LLP to decay within the detector. This search strategy is effective for a broad range of models. In addition to outlining this general approach, we demonstrate its effectiveness with the projected reach for two benchmark scenarios: a Higgs boson decaying into a pair of LLPs, and pair production of long-lived neutralinos in the gauge mediated supersymmetry breaking models. Our strategy increases the sensitivity to the lifetime of the LLP by two orders of magnitude or more and particularly exhibits a better behavior with a linear dependence on the lifetime in the large lifetime region compared to traditional LLP searches. The timing information significantly reduces the standard model background and provides a powerful new dimension for LLP searches.

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