Constraints on Composite-Models Effective Lagrangians from Neutrinoless Double Beta Decay
Abstract
Description
We give a brief review of the existing bounds on effective couplings for excited states ($e^*, ν^*, u^*, d^* $) of the ordinary quarks and leptons arising from a composite model scenario. We then explore the phenomenological implications of the hypothesis that the excited neutrino $ν^*$ might be of Majorana type. Recent bounds on the half-life of the $ΔL =2 $ neutrinoless double beta decay ($0νββ$) are used to constraint the compositeness effective couplings. We show that the bounds so obtained are roughly of the same order of magnitude as those available from high energy experiments.
20 pages; Latex file and World Scientific style files (uuendoded in a single file). 9 figures appended in a uuencoded file. Uses epsfig.sty; Invited Talk Presented at the International Workshop on Double Beta Decay, ECT*, April 24 - May 5 1995, Trento, Italy. To appear in the Proceedings
20 pages; Latex file and World Scientific style files (uuendoded in a single file). 9 figures appended in a uuencoded file. Uses epsfig.sty; Invited Talk Presented at the International Workshop on Double Beta Decay, ECT*, April 24 - May 5 1995, Trento, Italy. To appear in the Proceedings