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Title: New class of two-loop neutrino mass models with distinguishable phenomenology

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Journal Article: Published Article
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Physics Letters. Section B
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Related Information: CHORUS Timestamp: 2018-02-21 08:56:18; Journal ID: ISSN 0370-2693
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Cao, Qing-Hong, Chen, Shao-Long, Ma, Ernest, Yan, Bin, and Zhang, Dong-Ming. New class of two-loop neutrino mass models with distinguishable phenomenology. Netherlands: N. p., 2018. Web. doi:10.1016/j.physletb.2018.02.038.
Cao, Qing-Hong, Chen, Shao-Long, Ma, Ernest, Yan, Bin, & Zhang, Dong-Ming. New class of two-loop neutrino mass models with distinguishable phenomenology. Netherlands. doi:10.1016/j.physletb.2018.02.038.
Cao, Qing-Hong, Chen, Shao-Long, Ma, Ernest, Yan, Bin, and Zhang, Dong-Ming. 2018. "New class of two-loop neutrino mass models with distinguishable phenomenology". Netherlands. doi:10.1016/j.physletb.2018.02.038.
title = {New class of two-loop neutrino mass models with distinguishable phenomenology},
author = {Cao, Qing-Hong and Chen, Shao-Long and Ma, Ernest and Yan, Bin and Zhang, Dong-Ming},
abstractNote = {},
doi = {10.1016/j.physletb.2018.02.038},
journal = {Physics Letters. Section B},
number = ,
volume = ,
place = {Netherlands},
year = 2018,
month = 2

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Publisher's Version of Record at 10.1016/j.physletb.2018.02.038

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  • Recently, a proposal [R. N. Mohapatra and S. Nandi, Phys. Rev. Lett. {bold 79}, 181 (1997)] was made for a new class of gauge-mediated supersymmetry-breaking (GMSB) models where the standard model gauge group is embedded into the gauge group SU(2){sub L}{times}U(1){sub I{sub 3R}}{times}U(1){sub B{minus}L} [or SU(2){sub L}{times}SU(2){sub R}{times}U(1){sub B{minus}L}] at the supersymmetry-breaking scale {Lambda}. Supersymmetry breaking is transmitted to the visible sector via the same fields that are responsible for gauge symmetry breaking rather than by vector-like quarks and leptons as in the conventional GMSB models. These models have a number of attractive properties such as exact R-parity conservation, nonvanishingmore » neutrino masses and a solution to the SUSY CP (and strong CP) problem. In this paper, we present the detailed sparticle spectroscopy and phenomenological implications of the various models of this class that embody the general spirit of our previous work but use a larger variety of messenger fields. A distinct characteristic of this class of models is that unlike the conventional GMSB ones, the lightest neutralino is always the NLSP leading to photonic events in the colliders. {copyright} {ital 1997} {ital The American Physical Society}« less
  • Best-fit values of recent global analyses of neutrino data imply large solar neutrino mixing, vanishing U{sub e3}, and a nonmaximal atmospheric neutrino mixing angle {theta}{sub 23}. We show that these values emerge naturally by the hypothesis of scaling in the Majorana neutrino mass matrix, which states that the ratios of its elements are equal. It also predicts an inverted hierarchy for the neutrino masses. We point out several advantages and distinguishing tests of the scaling hypothesis compared to the L{sub e}-L{sub {mu}}-L{sub {tau}} flavor symmetry, which is usually assumed to provide an understanding of the inverted hierarchy. Scenarios which havemore » initially vanishing U{sub e3} and maximal atmospheric neutrino mixing are shown to be unlikely to lead to nonmaximal {theta}{sub 23} while simultaneously keeping U{sub e3} zero. We find a peculiar ratio of the branching ratios {mu}{yields}e{gamma} and {tau}{yields}e{gamma} in supersymmetric seesaw frameworks, which only depends on atmospheric neutrino mixing and results in {tau}{yields}e{gamma} being unobservable. The consequences of the scaling hypothesis for high energy astrophysical neutrinos at neutrino telescopes are also investigated. Then we analyze a seesaw model based on the discrete symmetry D{sub 4}xZ{sub 2} leading to scaling in the low energy mass matrix and being capable of generating the baryon asymmetry of the Universe via leptogenesis. The relevant CP phase is identical to the low energy Majorana phase, and successful leptogenesis requires an effective mass for neutrinoless double beta decay larger than 0.045 eV.« less
  • Conventional superstring-derived E[sub 6] models can accommodate small neutrino masses if a discrete symmetry is imposed which forbids tree-level Dirac neutrino masses but allows for radiative mass generation. Since the only possible symmetries of this kind are known to be generation dependent, we explore the possibility that the three sets of light states in each generation do not have the same assignments with respect to the 27 of E[sub 6], leading to nonuniversal gauge interactions under the additional U(1)[prime] factors for the known fermions. We argue that models realizing such a scenario are viable, with their structure being constrained mainlymore » by the requirement of the absence of flavor-changing neutral currents in the Higgs sector. Moreover, in contrast with the standard case, rank 6 models are not disfavored with respect to rank 5. By requiring the number of light neutral states to be minimal, these models have an almost unique pattern of neutrino masses and mixings. We construct a model based on the unconventional assignment scenario in which (with a natural choice of the parameters) [ital m][sub [nu][tau]][similar to]10 eV is generated at one loop, [ital m][sub [nu][mu]] is generated at two loops and lies in a range interesting for the solar neutrino problem, and [nu][sub [ital e]] remains massless. In addition, since baryon and lepton number are conserved, there is no proton decay in the model. In order to illustrate the nonstandard phenomenology implied by our scheme we also discuss a second scenario in which an attempt for solving the solar neutrino puzzle with matter-enhanced oscillations and practically massless neutrinos can be formulated, and in which peculiar effects for the [nu][sub [mu]][r arrow][nu][sub [tau]] conversion of the upward-going atmospheric neutrinos could arise as well.« less
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