In particle physics, majorons (named after Ettore Majorana) are a hypothetical type of Goldstone boson that are conjectured to mediate the neutrino mass violation of lepton number or B − L in certain high energy collisions such as Where two electrons collide to form two W bosons and the majoron J.
The U(1)B–L symmetry is assumed to be global so that the majoron is not "eaten up"[clarification needed] by the gauge boson and spontaneously broken.
Majorons were originally formulated in four dimensions by Yuichi Chikashige, Rabindra Mohapatra and Roberto Peccei to understand neutrino masses by the seesaw mechanism and are being searched for in the neutrino-less double beta decay process.
By propagating through the extra spatial dimensions the detectable number of majoron creation events vary accordingly.
EXO[3] and Kamland-Zen[4] have set half-life limits for majoron decays in xenon.