Hunting for sterile neutrino with future collider signatures

2023/09/28 by Yang, Hao, Long, Bingwei, Qiao, Cong-Feng · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2309.16233

Abstract

We study the feasibility to observe sterile neutrino at the high energy colliders with direct production channels through e⁺e^-, ep collision, and indirect production channels through decays of heavy meson, baryon and Higgs. For e⁺e^- collision, the e⁺e^-→ν_e N channel is explored with new signal selection method which tends to be efficient for light m_N, the constraints of active-sterile mixing |U_eN|² at the SuperKEKB, CEPC and ILC are expected to reach better lower limits than current experiments. For ep collision, We investigate the heavy sterile neutrino production through a new channel via proton bremsstrahlung, i.e., e^-γ→ NW^-, hundreds of GeV heavy sterile neutrino can be probe and new limit on mixing is given. For heavy hadrons decay, the lepton-number-violating decays of Λ_c, Ξ_c, Ξ_cc and Λ_b are explored via an intermediate on-shell Majorana neutrino in GeV scale. The branching fractions and the constraints for |U_{ℓ N}|² are given, and hence may put new limits on this mass region. The \rm Higgs → Wμμπ channel is also considered to test massive neutrino within Higgs sector.

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