Reconstructing a Heavy Neutral Lepton at the LHC

2024/07/05 by Pablo de la Torre, de la Torre, Pablo, M. Masip +3
Physics and Astronomy · Engineering · #Particle physics theoretical and experimental studies #Particle Accelerators and Free-Electron Lasers #Particle Detector Development and Performance

paper · pdf · doi:10.48550/arxiv.2407.04340

Abstract

Heavy lepton singlets N slightly mixed with a standard neutrino ν_ℓ are usually searched for at the LHC in the trilepton plus p_{\rm T}^{\rm miss} channel: pp → W⁺ → ℓ⁺ N with N→ ℓ^- W⁺ → ℓ^- ℓ'⁺ ν. We show that, although the longitudinal momentum of the final ν escapes detection, the mass of the heavy lepton can be reconstructed. While this possibility has not been considered in recent LHC searches, we find that the search for a mass peak could systematically improve the current collider bounds on the mixing |V_{ℓ N}|² for any mass m_N≥ M_W.

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