TY - JOUR AU - Fonseca, R. M. AU - Hirsch, M. PY - 2018 DA - 2018// TI - Delta L >= 4 lepton number violating processes T2 - Phys. Rev. D JO - Physical Review D SP - 015035 EP - 12pp VL - 98 IS - 1 PB - Amer Physical Soc AB - We discuss the experimental prospects for observing processes which violate lepton number (Delta L) in four units ( or more). First, we reconsider neutrinoless quadruple beta decay, deriving a model independent and very conservative lower limit on its half- life of the order of 10(41) ys for Nd-150. This renders quadruple beta decay unobservable for any feasible experiment. We then turn to a more general discussion of different possible low-energy processes with values Delta L >= 4. A simple operator analysis leads to rather pessimistic conclusions about the observability at low-energy experiments in all cases we study. However, the situation looks much brighter for accelerator experiments. For two example models with Delta L = 4 and another one with Delta L = 5, we show how the LHC or a hypothetical future pp collider, such as the FCC, could probe multilepton number violating operators at the TeV scale. SN - 2470-0010 UR - http://arxiv.org/abs/1804.10545 UR - https://doi.org/10.1103/PhysRevD.98.015035 DO - 10.1103/PhysRevD.98.015035 LA - English N1 - WOS:000439791500005 ID - Fonseca+Hirsch2018 ER -