Regular Article - Theoretical Physics
Determining the lifetime of long-lived particles at the HL-LHC
Department of Physics, Institute for Particle Physics Phenomenology, Durham University, DH1 3LE, Durham, UK
2 Centre for High Energy Physics, Indian Institute of Science, 560012, Bangalore, India
3 Laboratoire de Physique de Clermont (UMR 6533), CNRS/IN2P3, Univ. Clermont Auvergne, 4 Av. Blaise Pascal, 63178, Aubière Cedex, France
4 Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LAPTh, 74000, Annecy, France
5 Department of Physics and Astronomy, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, USA
Accepted: 2 February 2021
Published online: 19 February 2021
We examine the capacity of the Large Hadron Collider to determine the mean proper lifetime of long-lived particles assuming different decay final states. We mostly concentrate on the high luminosity runs of the LHC, and therefore, develop our discussion in light of the high amount of pile-up and the various upgrades for the HL-LHC runs. We employ model-dependent and model-independent methods in order to reconstruct the proper lifetime of neutral long-lived particles decaying into displaced leptons, potentially accompanied by missing energy, as well as charged long-lived particles decaying ihnto leptons and missing energy. We also present a discussion for lifetime estimation of neutral long-lived particles decaying into displaced jets, along with the challenges in the high PU environment of HL-LHC. After a general discussion, we illustrate and discuss these methods using several new physics models. We conclude that the lifetime can indeed be reconstructed in many concrete cases. Finally, we discuss to which extent including timing information, which is an important addition in the Phase-II upgrade of CMS, can improve such an analysis.
© The Author(s) 2021
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