Abstract
Some models of leptogenesis involve a quasi-degenerate pair of heavy neutrinos N1,2 whose masses can be small, O(GeV). Such neutrinos can contribute to the rare lepton-number-violating (LNV) decay \( {W}^{\pm}\to {\mathrm{\ell}}_1^{\pm }{\mathrm{\ell}}_2^{\pm }{\left({q}^{\prime}\overline{q}\right)}^{\mp } \). If both N1 and N2 contribute, there can be a CP-violating rate difference between the LNV decay of a W − and its CP-conjugate decay. In this paper, we examine the prospects for measuring such a CP asymmetry ACP at the LHC. We assume a value for the heavy-light neutrino mixing parameter |BℓN|2 = 10−5, which is allowed by the present experimental constraints, and consider 5 GeV ≤ MN ≤ 80 GeV. We consider three versions of the LHC — HL-LHC, HE-LHC, FCC-hh — and show that small values of the CP asymmetry can be measured at 3σ, in the range 1% ≲ ACP ≲ 15%.
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Najafi, F., Kumar, J. & London, D. CP violation in rare lepton-number-violating W decays at the LHC. J. High Energ. Phys. 2021, 21 (2021). https://doi.org/10.1007/JHEP04(2021)021
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DOI: https://doi.org/10.1007/JHEP04(2021)021