Search for massive long-lived particles decaying semileptonically in the LHCb detector

Abstract : A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2 1/fb, respectively. The analysis is performed assuming a set of production mechanisms with simple topologies, including the production of a Higgs-like particle decaying into two long-lived particles. The mass range from 20 to 80 GeV and lifetimes from 5 to 100 ps are explored. Results are also interpreted in terms of neutralino production in different supersymmetric models, with masses in the 23-198 GeV range. No excess above the background expectation is observed and upper limits are set on the production cross-section for various points in the parameter space of theoretical models.
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Submitted on : Tuesday, December 6, 2016 - 9:49:49 AM
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Search for massive long-lived particles decaying semileptonically in the LHCb detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77, pp.224. ⟨10.1140/epjc/s10052-017-4744-6⟩. ⟨in2p3-01409640⟩

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