Search for Light Long-Lived Particles in 𝑝⁒𝑝 Collisions at βˆšπ‘ =13  TeV Using Displaced Vertices in the ATLAS Inner Detector

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, J.R. Curran, D. Duda, S. M. Farrington, Y. Gao, J.M. Gargan, R.Y. Gonzalez Andana, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. SilvaN. Themistokleous, E.M. Villhauer, B.M. Wynne, Z. Xu, E. Zaid

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Abstract

A search for long-lived particles (LLPs) using 140  fbβˆ’1 of 𝑝⁒𝑝 collision data with βˆšπ‘ =13  TeV recorded by the ATLAS experiment at the LHC is presented. The search targets LLPs with masses between 5 and 55 GeV that decay hadronically in the ATLAS inner detector. Benchmark models with LLP pair production from exotic decays of the Higgs boson and models featuring long-lived axionlike particles (ALPs) are considered. No significant excess above the expected background is observed. Upper limits are placed on the branching ratio of the Higgs boson to pairs of LLPs, the cross section for ALPs produced in association with a vector boson, and, for the first time, on the branching ratio of the top quark to an ALP and a 𝑒/𝑐 quark.
Original languageEnglish
Article number161803
Pages (from-to)1-24
Number of pages24
JournalPhysical Review Letters
Volume133
Issue number16
Early online date17 Oct 2024
DOIs
Publication statusPublished - 18 Oct 2024

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