CaltechAUTHORS
  A Caltech Library Service

Reexamining the light neutrino exchange mechanism of the 0νββ decay with left- and right-handed leptonic and hadronic currents

Štefánik, Dušan and Dvornický, Rastislav and Šimkovic, Fedor and Vogel, Petr (2015) Reexamining the light neutrino exchange mechanism of the 0νββ decay with left- and right-handed leptonic and hadronic currents. Physical Review C, 92 (5). Art. No. 055502. ISSN 0556-2813. http://resolver.caltech.edu/CaltechAUTHORS:20151203-085434707

[img] PDF - Published Version
See Usage Policy.

590Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20151203-085434707

Abstract

The extension of the Majorana neutrino mass mechanism of the neutrinoless double-beta decay (0νββ) with the inclusion of right-handed leptonic and hadronic currents is revisited. While only the exchange of light neutrinos is assumed, the s_(1/2) and p_(1/2) states of emitted electrons as well as recoil corrections to the nucleon currents are taken into account. Within the standard approximations the decay rate is factorized into a sum of products of kinematical phase-space factors, nuclear matrix elements, and the fundamental parameters that characterize the lepton number violation. Unlike in the previous treatments, the induced pseudoscalar term of hadron current is included, resulting in additional nuclear matrix elements. An improved numerical computation of the phase-space factors is presented, based on the exact Dirac wave functions of the s_(1/2) and p_(1/2) electrons with finite nuclear size and electron screening taken into account. The dependence of values of these phase-space factors on the different approximation schemes used in evaluation of electron wave functions is discussed. The upper limits for effective neutrino mass and the parameters ⟨λ⟩ and ⟨η⟩ characterizing the right-handed current mechanism are deduced from data on the 0νββ decay of ^(76)Ge and ^(136)Xe using nuclear matrix elements calculated within the nuclear shell model and quasiparticle random phase approximation. The differential decay rates, i.e., the angular correlations and the single electron energy distributions for various combinations of the total lepton number violating parameters that can help to disentangle the possible mechanism, are described and discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevC.92.055502DOIArticle
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.055502PublisherArticle
Additional Information:© 2015 American Physical Society. Received 6 July 2015; published 4 November 2015. This work is supported in part by the VEGA Grant Agency of the Slovak Republic under Contract No. 1/0876/12, by Slovak Research and Development Agency under Contract No. APVV-14-0524, and by the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LM2011027.
Funders:
Funding AgencyGrant Number
Slovak Republic VEGA Grant Agency1/0876/12
Slovak Research and Development AgencyAPVV-14-0524
Ministry of Education, Youth and Sports of the Czech RepublicLM2011027
Classification Code:PACS number(s): 21.60.Jz, 23.40.Hc, 14.60.Pq
Record Number:CaltechAUTHORS:20151203-085434707
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20151203-085434707
Official Citation:Reexamining the light neutrino exchange mechanism of the 0νββ decay with left- and right-handed leptonic and hadronic currents Dušan Štefánik, Rastislav Dvornický, Fedor Šimkovic, and Petr Vogel Phys. Rev. C 92, 055502 (2015) – Published 4 November 2015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62571
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Dec 2015 19:02
Last Modified:04 Dec 2015 01:47

Repository Staff Only: item control page