Neutrino Oscillations in Matter

Mikheyev, S.; Smirnov, A. Yu.

doi:10.1007/978-3-642-71689-8_138

Cited by 126 publications

(202 citation statements)

References 4 publications

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“…The potential is proportional to the electron density and it has different sign for neutrinos and antineutrinos, even in the CP conserving case. It gives rise to the well-known Mikheyev-Smirnov-Wolfenstein (MSW) effect [1,2] which is crucial in the interpretation of the solar neutrino data.…”

Section: Introductionmentioning

confidence: 99%

Effects of environment dependence of neutrino mass versus solar and reactor neutrino data

2006

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In this work we study the phenomenological consequences of the environment dependence of neutrino mass on solar and reactor neutrino phenomenology. We concentrate on mass varying neutrino scenarios in which the enviroment dependence is induced by Yukawa interactions of a light neutral scalar particle which couples to neutrinos and matter. Under the assumption of one mass-scale dominance, we perform a global analysis of solar and KamLAND neutrino data which depends on 4 parameters: the two standard oscillation parameters, m 2 0;21 and tan 2 12 , and two new coefficients which parameterize the environment dependence of the neutrino mass. We find that, generically, the inclusion of the environment dependent terms does not lead to a very statistically significant improvement on the description of the data in the most favored MSW LMA (or LMA-I) region. It does, however, substantially improve the fit in the high-m 2 LMA (or LMA-II) region which can be allowed at 98:9% CL. Conversely, the analysis allow us to place stringent constraints on the size of the environment dependence terms which can be translated on a bound on the product of the effective neutrino-scalar ( ) and matter-scalar ( N ) Yukawa couplings, as a function of the scalar field mass (m S ) in these models, j N j 10 ÿ7 eV m S 2 3:0 10 ÿ28 (at 90% CL) .

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Section: Introductionmentioning

confidence: 99%

Effects of environment dependence of neutrino mass versus solar and reactor neutrino data

2006

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“…Now given that m(ν τ ) ∼ 1/20 eV [as estimated in Eq. (10)], the MSW solution for the solar neutrino puzzle [44] suggests that m(ν µ )/m(ν τ ) ≈ 1/8-1/20. With hierarchical neutrino masses, the higher value of the mass-ratio (like 1/8) holds only for the large angle MSW solution (see below).…”

Section: ) Hierarchy Through Off-diagonal Mixingsmentioning

confidence: 99%

Probing grand unification with fermion masses, neutrino oscillations and proton decay

Pati

2003

Pramana - J Phys

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It is noted that one is now in possession of a set of facts, which may be viewed as the matching pieces of a puzzle; in that all of them can be resolved by just one idea-that is grand unification. These include (i) the observed family-structure, (ii) quantization of electric charge, (iii) the meeting of the three gauge couplings, (iv) neutrino oscillations [in particular the value ∆m 2 (ν µ − ν τ ), suggested by SuperK], (v) the intricate pattern of the masses and mixings of the fermions, including the smallness of V cb and the largeness of θ osc νµντ , and (vi) the need for B-L as a generator to implement baryogenesis (via leptogenesis). All these pieces fit beautifully together within a single puzzle board framed by supersymmetric unification, based on either SO(10) or a string-unified G(224)-symmetry. The two notable pieces of the puzzle still missing, however, are proton decay and supersymmetry.A concrete proposal is presented within a predictive SO(10)/G(224)-framework that successfully describes the masses and mixings of all fermions, including the neutrinos-with eight predictions, all in agreement with observation. Within this framework, a systematic study of proton decay is carried out, which (a) pays special attention to its dependence on the fermion masses, and (b) limits the threshold corrections so as to preserve natural coupling unification. The study updates prior work by Babu, Pati and Wilczek, in the context of both MSSM and its (interesting) variant, the so-called ESSM, by allowing for improved values of the matrix elements and of the short-and long-distance renormalization effects. It shows that a conservative upper limit on the proton lifetime is about (1/3 -2)×10 34 years, with νK + being the dominant decay mode, and quite possibly µ + K 0 and e + π 0 being prominent. This in turn strongly suggests that an improvement in the current sensitivity by a factor of five to ten (compared to SuperK) ought to reveal proton decay. Otherwise some promising and remarkably successful ideas on unification would suffer a major setback. For comparison, some alternatives to the conventional approach to unification pursued here are mentioned at the end.

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“…• vacuum oscillations with ∆m 2 ei = (0.5-1) × 10 −10 eV 2 and sin 2 (2θ) = 0.8-1 • non-adiabatic-matter-enhanced oscillations via the MSW mechanism [25] with ∆m 2 ei = (0.3-1.2) × 10 −5 eV 2 and sin 2 (2θ) = (0.4-1.2) × 10 −2 , and…”

Section: B Solar Neutrinosmentioning

confidence: 99%

Futurev τ oscillation experiments and present data

Gómez-Cadenas

Gonzalez-Garcia

1996

Z. Phys. C - Particles and Fields

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Our goal in this paper is to examine the discovery potential of laboratory experiments searching for the oscillation ν µ (ν e ) → ν τ , in the light of recent data on solar and atmospheric neutrino experiments, which we analyse together with the most restrictive results from laboratory experiments on neutrino oscillations. In order to explain simultaneously all present results we use a four-neutrino framework, with an additional sterile neutrino. Our predictions are rather pessimistic for the upcoming experiments NOMAD and CHORUS, which, we find, are able to explore only a small area of the oscillation parameter space. On the other hand, the discovery potential of future experiments is much larger. We consider three examples. E803, which is approved to operate in the future Fermilab main injector beam line, MINOS, a proposed long-baseline experiment also using the Fermilab beam, and NAUSICAA, an improved detector which improves by an order of magnitude the performance of CHORUS/NOMAD and can be operated either at CERN or at Fermilab beams. We find that those experiments can cover a very substantial fraction of the oscillation parameter space, having thus a very good chance of discovering both ν µ → ν τ and ν e → ν τ oscillation modes.CERN-TH/95-80 * E-mail: jjgomez@phast.umass.edu or jjgomez@huhepl.harvard.edu. On leave from PPE Division, CERN,

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Neutrino Oscillations in Matter

Cited by 126 publications

References 4 publications

Effects of environment dependence of neutrino mass versus solar and reactor neutrino data

Effects of environment dependence of neutrino mass versus solar and reactor neutrino data

Probing grand unification with fermion masses, neutrino oscillations and proton decay

Futurev τ oscillation experiments and present data

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