May 27 – 31, 2019
The Czech National Library of Technology
UTC timezone
The MEDEX'19 proceedings were published on the October 25, 2019!

More than Exotic Neutrinoless Double Beta Decay with Majoron-like Emission

May 28, 2019, 11:00 AM
30m
Balling Hall (ground floor) (The Czech National Library of Technology)

Balling Hall (ground floor)

The Czech National Library of Technology

Technická 6/2710 160 80 Prague 6 - Dejvice, Czech Republic
Oral Presentation Session (Chair: F. Simkovic)

Speaker

Dr Frank Deppisch (UCL)

Description

I present a novel mode of neutrinoless double beta decay with emission of a light Majoron-like scalar particle ϕ. We assume it couples via an effective seven-dimensional operator with a (V+A) lepton current and (V±A) quark currents leading to a long-range contribution that is unsuppressed by the light neutrino mass. Calculating the total double beta decay rate and determine the fully differential shape for this mode, we find that future double beta decay searches are sensitive to scales of the order ΛNP1 TeV for the effective operator and a light scalar mϕ<0.2 MeV, based on ordinary double beta decay Majoron searches. The angular and energy distributions can deviate considerably from that of two-neutrino double beta decay, which is the main background. I discuss possible ultraviolet completions where such an effective operator can emerge.

Presentation materials