Deppisch, FF; Kulkarni, S; Liu, W; (2019) Heavy neutrino production via Z ' at the lifetime frontier. Physical Review D , 100 (3) 10.1103/PhysRevD.100.035005.

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Abstract

We investigate the pair production of right-handed neutrinos from the decay of an additional neutral Z1 boson in the gauged B − L model. Taking into account current constraints on the Z mass and the associated gauge coupling g1, we analyse the sensitivity of proposed experiments at the lifetime frontier, FASER 2, CODEX-b, MATHUSLA as well as a hypothetical version of the MAPP detector to a long lived heavy neutrino N originating in the decays of the Z. We further complement this study with determining the reach of LHCb and a CMS-type detector for the high-luminosity LHC run. We demonstrate that in a backgroundfree scenario with g1 ¼ 10−3 near the current limit, FASER 2 is sensitive to the active-sterile neutrino mixing down to VμN ≈ 10−4, while a reach of VμN ≈ 10−5 can be obtained for CODEX-b and LHCb, in a mass regime of mN ≈ 5–20 GeV and mZ0 ≈ 20–70 GeV. Finally, MATHUSLA can probe VμN ≈ 10−7 and cover the mixing regime expected in a canonical seesaw scenario of light neutrino mass generation.

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