Predictive Dirac and Majorana neutrino mass textures from S U ( 6 ) grand unified theories

Chacko, Zackaria; Dev, P. S. Bhupal; Mohapatra, Rabindra N.; Thapa, Anil

doi:10.1103/PhysRevD.102.035020

Title: Predictive Dirac and Majorana neutrino mass textures from $S U (6)$ grand unified theories

Journal Article · Thu Aug 20 00:00:00 EDT 2020 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.102.035020· OSTI ID:1648393

;

; Mohapatra, Rabindra N.;

We present simple and predictive realizations of neutrino masses in theories based on the $$\textit{SU}$$(6) grand unifying group. At the level of the lowest-dimension operators, this class of models predicts a skew-symmetric flavor structure for the Dirac mass term of the neutrinos. In the case that neutrinos are Dirac particles, the lowest-order prediction of this construction is then one massless neutrino and two degenerate massive neutrinos. Higher-dimensional operators suppressed by the Planck scale perturb this spectrum, allowing a good fit to the observed neutrino mass matrix. A firm prediction of this construction is an inverted neutrino mass spectrum with the lightest neutrino hierarchically lighter than the other two, so that the sum of neutrino masses lies close to the lower bound for an inverted hierarchy. In the alternate case that neutrinos are Majorana particles, the mass spectrum can be either normal or inverted. However, the lightest neutrino is once again hierarchically lighter than the other two, so that the sum of neutrino masses is predicted to lie close to the corresponding lower bound for the normal or inverted hierarchy. Near future cosmological measurements will be able to test the predictions of this scenario for the sum of neutrino masses. In the case of Majorana neutrinos that exhibit an inverted hierarchy, future neutrinoless double beta experiments can provide a complementary probe.

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Research Organization:: Oklahoma State Univ., Stillwater, OK (United States); Washington Univ., St. Louis, MO (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); United States-Israel Binational Science Foundation (BSF)

Grant/Contract Number:: SC0017987; SC0016013; AC02-07CH11359; PHY-1914731; 2018236

OSTI ID:: 1648393

Alternate ID(s):: OSTI ID: 1802819

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 102 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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