Can LSND be included in a three-neutrino framework?

Haug, O.; Faessler, Amand; Vergados, J.D.

doi:10.1088/0954-3899/27/8/304

Cited by 6 publications

(3 citation statements)

References 46 publications

(69 reference statements)

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“…In order to reproduce the experimental results from the solar and atmospheric neutrinos data combination, with three active neutrinos and no sterile neutrino, one must require a large ν µ − ν τ mass hierarchy, m νµ /m ντ = χ ≈ 7 − 40, and a large mixing angle, sin 2 (2θ) > 0.82. The renormalization group evolution produces sneutrino VEVs, General fits to the neutrino oscillation data, using the combined tree and one-loop level contributions, are attempted in several works [235,236,237,238] with the purpose to determining the allowed ranges for the various RPV coupling constants. Haug et al, [236] compare the combined tree and one-loop level contributions from the bilinear interactions and the trilinear interactions, λ i33 , λ ′ i33 , with a phenomenological light neutrinos mass matrix with entries representing upper limits inferred from the oscillation experiments and the ββ 0ν measurements.…”

Section: Combined Bilinear and Trilinear Interactionsmentioning

confidence: 99%

“…Haug et al, [236] compare the combined tree and one-loop level contributions from the bilinear interactions and the trilinear interactions, λ i33 , λ ′ i33 , with a phenomenological light neutrinos mass matrix with entries representing upper limits inferred from the oscillation experiments and the ββ 0ν measurements. The subsequent work by Haug et al, [238] examines the compatibility of the LSND data with the three light neutrino generations scenario. Using an extended analysis of the oscillation data accounting for the constraints from ν e + e inclusive scattering reactions on the neutrino CP phases in the effective neutrino mass, < m νe >= i V ′ †2 ei m ν i e iλ i , it is found that the effective mass obtained in the fit including the LSND data is an order of magnitude larger than that obtained in the fit excluding it.…”

Section: Combined Bilinear and Trilinear Interactionsmentioning

confidence: 99%

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Phenomenological constraints on broken R parity symmetry in supersymmetry models

Chemtob

2005

Progress in Particle and Nuclear Physics

157

113

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The R parity odd renormalizable Yukawa interactions of quarks and leptons with the scalar superpartners have the ability to violate the baryon and lepton numbers, change the hadron and lepton flavors and make the lightest supersymmetric particle unstable. The existence of an approximate R parity symmetry would thus affect in a deep way the conventional framework of the Minimal Supersymmetric Standard Model where an exact R parity symmetry is built-in by assumption. The purpose of the present review is to survey in a systematic way the direct experimental constraints set on the R parity violating couplings by the low and intermediate energy physics processes. We consider first the option of bilinear R parity violation and spontaneously broken R parity symmetry and proceed next to the trilinear R parity violating interactions. The discussion aims at surveying the indirect coupling constant bounds derived from fundamental tests of the Standard Model and the variety of scattering and rare decay processes. We also discuss the constraints imposed by the renormalization group scale evolution and the cosmological and astrophysical phenomenology. IntroductionThe multiplicative Z 2 symmetry, known as R parity, fulfills a central function in supersymmetry physics. Without R parity symmetry, the Minimal Supersymmetric Standard Model (MSSM) would include bilinear and trilinear renormalizable superpotential terms, coupling the quarks and leptons to their scalar superpartners, which have the ability to initiate fast nucleon decay, large neutrinos masses and the LSP (lightest supersymmetric particle) disintegration into ordinary particles. Thus apart from threatening the nucleon and neutrino stability and contributing to the hadron and lepton flavor changing processes and to neutrino masses and flavor mixing, the R parity odd Yukawa interactions would also disallow any of the supersymmetric cosmic relic particles to contribute to the Universe dark matter component. The R parity symmetry was first introduced in a 1978 work by Farrar and Fayet [1], as part of attempts towards building a realistic particle physics phenomenology of supersymmetry [2,3,4]. This step followed closely in time the major developments in years [1974][1975] which culminated in the construction of supersymmetric field theories [5,6,7], the implementation of spontaneous supersymmetry breaking schemes [8,9] and the discovery of R symmetries [10]. The collection of reprints by Ferrara [11] offers a valuable grasp on the progress of ideas from the early period until the middle 1980's. The subsequent developments are discussed in the review articles [12,13] and the collection of preprints by Salam and Sezgin [14]. As an historical aside on the origin of R symmetries, we note that Wess and Zumino [5] introduced an R quantum number as a weighting index labeling distinct representations of *

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Section: Combined Bilinear and Trilinear Interactionsmentioning

confidence: 99%

Section: Combined Bilinear and Trilinear Interactionsmentioning

confidence: 99%

Phenomenological constraints on broken R parity symmetry in supersymmetry models

Chemtob

2005

Progress in Particle and Nuclear Physics

157

113

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“…This has been done in a number of papers, see e.g. the recent work by Haug et al [32] and references therein. They cannot determine, however, the scale of the masses, e.g.…”

Section: Introductionmentioning

confidence: 99%

The exotic double-charge exchange μ−→e+ conversion in nuclei

et al. 2002

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The formalism for the neutrinoless (µ − , e + ) conversion is investigated in detail and the relevant nuclear matrix elements for light intermediate neutrinos in the case of 27 Al(µ − , e + ) 27 N a are calculated. The nucleus 27 Al is going to be used as a stopping target in the MECO experiment at Brookhaven, one of the most sensitive probes expected to reach a sensitivity in the branching ratio of the order 10 −16 within the next few years. The relevant transition operators are constructed utilizing a variety of mechanisms present in current gauge theories, with emphasis on the intermediate neutrinos, both light and heavy, and heavy SUSY particles. The nuclear wave functions, both for the initial state and all excited final states are obtained in the framework of 1s − 0d shell model employing the well-known and tested Wildenthal realistic interaction. In the case of the light intermediate neutrinos the transition rates to all excited final states up to 25 M eV in energy are calculated. We find that the imaginary part of the amplitude is dominant. The total rate is calculated by summing over all these partial transition strengths. We also find that the rate due to the real part of the amplitude is much smaller than the corresponding quantity found previously by the closure approximation.

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