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Title: Interference between light and heavy neutrinos for 0 νββ decay in the left–right symmetric model

Abstract

Neutrinoless double-beta decay is proposed as an important low energy phenomenon that could test beyond the Standard Model physics. There are several potentially competing beyond the Standard Model mechanisms that can induce the process. It thus becomes important to disentangle the different processes. In the present study we consider the interference effect between the light left-handed and heavy right-handed Majorana neutrino exchange mechanisms. The decay rate, and consequently, the phase-space factors for the interference term are derived, based on the left–right symmetric model. The numerical values for the interference phase-space factors for several nuclides are calculated, taking into consideration the relativistic Coulomb distortion of the electron wave function and finite-size of the nucleus. As a result, the variation of the interference effect with the Q-value of the process is studied.

Authors:
 [1];  [1];  [1]
  1. Central Michigan Univ., Mount Pleasant, MI (United States)
Publication Date:
Research Org.:
Central Michigan Univ., Mount Pleasant, MI (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1405536
Alternate Identifier(s):
OSTI ID: 1374602
Grant/Contract Number:
SC0008529; SC0015376
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 769; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ahmed, Fahim, Neacsu, Andrei, and Horoi, Mihai. Interference between light and heavy neutrinos for 0νββ decay in the left–right symmetric model. United States: N. p., 2017. Web. doi:10.1016/j.physletb.2017.03.066.
Ahmed, Fahim, Neacsu, Andrei, & Horoi, Mihai. Interference between light and heavy neutrinos for 0νββ decay in the left–right symmetric model. United States. doi:10.1016/j.physletb.2017.03.066.
Ahmed, Fahim, Neacsu, Andrei, and Horoi, Mihai. Fri . "Interference between light and heavy neutrinos for 0νββ decay in the left–right symmetric model". United States. doi:10.1016/j.physletb.2017.03.066.
@article{osti_1405536,
title = {Interference between light and heavy neutrinos for 0νββ decay in the left–right symmetric model},
author = {Ahmed, Fahim and Neacsu, Andrei and Horoi, Mihai},
abstractNote = {Neutrinoless double-beta decay is proposed as an important low energy phenomenon that could test beyond the Standard Model physics. There are several potentially competing beyond the Standard Model mechanisms that can induce the process. It thus becomes important to disentangle the different processes. In the present study we consider the interference effect between the light left-handed and heavy right-handed Majorana neutrino exchange mechanisms. The decay rate, and consequently, the phase-space factors for the interference term are derived, based on the left–right symmetric model. The numerical values for the interference phase-space factors for several nuclides are calculated, taking into consideration the relativistic Coulomb distortion of the electron wave function and finite-size of the nucleus. As a result, the variation of the interference effect with the Q-value of the process is studied.},
doi = {10.1016/j.physletb.2017.03.066},
journal = {Physics Letters. Section B},
number = C,
volume = 769,
place = {United States},
year = {Fri Mar 31 00:00:00 EDT 2017},
month = {Fri Mar 31 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2017.03.066

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  • Neutrinoless double-beta decay is proposed as an important low energy phenomenon that could test beyond the Standard Model physics. There are several potentially competing beyond the Standard Model mechanisms that can induce the process. It thus becomes important to disentangle the different processes. In the present study we consider the interference effect between the light left-handed and heavy right-handed Majorana neutrino exchange mechanisms. The decay rate, and consequently, the phase-space factors for the interference term are derived, based on the left–right symmetric model. The numerical values for the interference phase-space factors for several nuclides are calculated, taking into consideration themore » relativistic Coulomb distortion of the electron wave function and finite-size of the nucleus. As a result, the variation of the interference effect with the Q-value of the process is studied.« less
  • Results are presented from a search for heavy, right-handed muon neutrinos, N[mu], and right-handed W[R] bosons, which arise in the left-right symmetric extensions of the standard model. The analysis is based on a 5.0 inverse femtobarn sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected by the CMS detector at the Large Hadron Collider. No evidence is observed for an excess of events over the standard model expectation. For models with exact left-right symmetry, heavy right-handed neutrinos are excluded at 95% confidence level for a range of neutrino masses below the W[R] mass, dependent on the valuemore » of M(W[R]). The excluded region in the two-dimensional (M(W[R]), M(N[mu])) mass plane extends to M(W[R]) = 2.5 TeV.« less
  • We construct a full left-right model for the electroweak interactions based on the SU(3){sub L} x SU(3){sub R} x U(1){sub X} gauge symmetry. The fermion content of the model is such that anomaly cancellation restricts the number of families to be a multiple of three. One of the most important features of the model is the joint presence of three light active neutrinos, three additional neutrinos at keV mass scale, and six heavy ones with masses around 10{sup 11} GeV. They form a well-motivated part of the spectrum in the sense that they address challenging problems related to neutrino oscillation,more » warm dark matter, and baryogenesis through leptogenesis.« less
  • A left-right symmetric model is discussed with new mirror fermions and a Higgs sector with two doublets and neutral scalar singlets. The seesaw mechanism is generalized, including not only neutrino masses but also charged fermion masses. The spectrum of heavy neutrinos presents a second seesaw mass matrix and has neutrinos masses naturally in the TeV region. The model has very clear signatures for the new neutral vector gauge bosons. Two classes of models are discussed. New mirror neutrinos can be very light and a new Z{sup '} can be discriminated from other models by a very high invisible branching fraction.more » The other possibility is that mirror neutrinos can have masses naturally in the TeV region and can be produced through Z{sup '} decays into heavy neutrino pairs. Signatures and production processes for the model at the LHC energy are also presented.« less
  • An SU(2)[sub [ital L]][direct product]SU(2)[sub [ital R]][direct product]U(1)[sub [ital B][minus][ital L]] effective Hamiltonian is considered to estimate the masses of the [ital t] quark and [ital W][sub [ital R]] boson. Taking SU(6)-symmetric ([ital K][sup 0],[ital [bar K]][sup 0]) and ([ital B][sub [ital d]][sup 0],[ital [bar B]][sub [ital d]][sup 0]) mesonic states in a field-theoretic quark model, we evaluate the hadronic matrix elements with the help of [ital W][sub [ital L]-][ital W[ital R]] box diagrams and obtain the [ital K][sup 0-][ital [bar K]0] and [ital B][sub [ital d]][sup 0-][ital [bar B]][sub [ital d]][sup 0] mass differences. With experimental values of [Delta][italmore » M][sub [ital B][ital d]] and [Delta][ital M][sub [ital K]] as input we estimate [ital m][sub [ital t]]=162[sub [minus]22][sup +21] GeV and [ital M][sub [ital R]][ge]1650 GeV, respectively. These results are consistent with most of the present theoretical predictions as well as experimental bounds on [ital m][sub [ital t]]. So far as the mass of the [ital W][sub [ital R]] boson is concerned, it is in agreement with the prediction by Beall [ital et] [ital al]. Further, the present investigation also leads to an appreciable charge radius for the [ital B][sub [ital d]][sup 0] meson which we expect to be verified in the near future.« less