New leptoquark mechanism of neutrinoless double <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math></span> decay

M. Hirsch; H. V. Klapdor-Kleingrothaus; S. G. Kovalenko

doi:10.1103/PhysRevD.54.R4207

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New leptoquark mechanism of neutrinoless double $β$ decay

M. Hirsch, H. V. Klapdor-Kleingrothaus, and S. G. Kovalenko

Phys. Rev. D 54, R4207(R) – Published 1 October 1996

Abstract

A new mechanism for neutrinoless double $β (0 ν β β)$ decay based on leptoquark exchange is discussed. Because of the specific helicity structure of the effective four-fermion interaction this contribution is strongly enhanced compared to the well-known mass mechanism of $0 ν β β$ decay. As a result the corresponding leptoquark parameters are severely constrained from nonobservation of $0 ν β β$ decay. These constraints are more stringent than those derived from other experiments.

Received 11 March 1996

DOI:https://doi.org/10.1103/PhysRevD.54.R4207

Authors & Affiliations

M. Hirsch, H. V. Klapdor-Kleingrothaus, and S. G. Kovalenko^*

Max-Planck-Institut für Kernphysik, P.O. 10 39 80, D-69029, Heidelberg, Germany

^*Permanent address: Joint Institute for Nuclear Research, Dubna, Russia.

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Vol. 54, Iss. 7 — 1 October 1996

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Physical Review D

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