Unsterile-active neutrino mixing: Consequences on radiative decay and bounds from the x-ray background

Boyanovsky, D.; Holman, R.; Hutasoit, Jimmy A.

doi:10.1103/physrevd.80.025012

Cited by 5 publications

(6 citation statements)

References 118 publications

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“…The structure of propagators of the massive active-like mode and the unsterile-like mode are similar to the ones found in [32].…”

Section: Introductionsupporting

confidence: 76%

“…This Lagrangian density can be understood using a renormalization group resummation argument discussed in Ref. [32] and references therein.…”

Section: +1 Schemementioning

confidence: 99%

“…Following [32], let us introduce a rescaled unsterile field 4) such that the Lagrangian density is now given by 5) where I is the identity in the "flavor" space, and the "mass" matrix is…”

Section: +1 Schemementioning

confidence: 99%

“…This can be understood using a renormalization group resummation argument presented in Ref. [32]. The spectral density is obtained from the discontinuity across the real axis in the complex p 2 plane…”

Section: B Complex Poles and Spectral Density For The Unsterile-likementioning

confidence: 99%

“…[32], we considered the sterile neutrino to be an unparticle, namely an unsterile neutrino, and studied the mixing of an active and an unsterile neutrino, which revealed unexpected momentum dependence of the mixing angles. Here, we extend that model by including a second active neutrino, and study the consequences in neutrino oscillations.…”

Section: Introductionmentioning

confidence: 99%

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Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

2010

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We consider the possibility that sterile neutrinos exist and admit a description as unparticles;we call these unsterile neutrinos. We then examine the nature of neutrino oscillations in a model where an unsterile can mix with two active flavors with a very simple mass matrix of the see-saw type. Despite these simplifications, we find a number of remarkable features, all of which will occur generically when more realistic cases are considered. These include momentum dependent mixing angles, "invisible" decay widths for the unsterile-like mode, as well as the inheritance of a non-vanishing spectral density for the massive active-like modes. We also obtain the disappearance and appearance probabilities for the active-like neutrinos and find remarkable interference effects between the active and unsterile neutrinos as a consequence of threshold effects, yielding new oscillatory contributions with different oscillation lengths. These effects are only measurable on short baseline experiments because there both probabilities are suppressed as compared to mixing with a canonical sterile neutrino, thereby providing a diagnostics tool to discriminate unsterile from canonical sterile neutrinos. We conclude with a discussion of whether these new phenomena could aid in the reconciliation of the LSND and MiniBooNE results.

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“…The structure of propagators of the massive active-like mode and the unsterile-like mode are similar to the ones found in [32].…”

Section: Introductionsupporting

confidence: 76%

“…This Lagrangian density can be understood using a renormalization group resummation argument discussed in Ref. [32] and references therein.…”

Section: +1 Schemementioning

confidence: 99%

“…Following [32], let us introduce a rescaled unsterile field 4) such that the Lagrangian density is now given by 5) where I is the identity in the "flavor" space, and the "mass" matrix is…”

Section: +1 Schemementioning

confidence: 99%

Section: B Complex Poles and Spectral Density For The Unsterile-likementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

2010

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Charged lepton mixing via heavy sterile neutrinos

Lello

Boyanovsky

2014

Nuclear Physics B

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Pseudoscalar meson decay leads to an entangled state of charged leptons ($\mu,e$) and massive neutrinos. Tracing out the neutrino degrees of freedom leads to a reduced density matrix for the charged leptons whose off-diagonal elements reveal \emph{charged lepton oscillations}. Although these decohere on unobservably small time scales $ \lesssim 10^{-23} s $ they indicate charged lepton \emph{mixing} as a result of common intermediate states. The charged lepton self energy up to one loop features flavor off-diagonal terms responsible for charged lepton mixing: a dominant ``short distance'' contribution with $W$ bosons and massive neutrinos in the intermediate state, and a subdominant ``large distance'' contribution with pseudoscalar mesons and massive neutrinos in the intermediate state. Mixing angle(s) are GIM suppressed, and are \emph{momentum and chirality dependent}. The difference of negative chirality mixing angles near the muon and electron mass shells is $\theta_L(M^2_\mu) -\theta_L(M^2_e)\propto G_F \sum U_{\mu j} m^2_j U^*_{j e}$ with $m_j$ the mass of the neutrino in the intermediate state. Recent results from TRIUMF, suggest an upper bound $\theta_L(p^2\simeq M^2_\mu)-\theta_L(p^2 \simeq M^2_e) < 10^{-14}\,\Big(M_S/\mathrm{100}\,MeV\Big)^2$ for one generation of a heavy sterile neutrino with mass $M_S$. We obtain the wavefunctions for the propagating modes, and discuss the relation between the lepton flavor violating process $\mu \rightarrow e\gamma$ and charged lepton mixing, highlighting that a measurement of such process implies a mixed propagator $\mu, e$. Furthermore writing flavor diagonal vertices in terms of mass eigenstates yields novel interactions suggesting further contributions to lepton flavor violating process as a consequence of momentum and chirality dependent mixing angles.Comment: 26 pages, 5 fig

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Unsterile-Active Neutrino Mixing

Hutasoit¹

2013

J. Phys.: Conf. Ser.

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We consider a sterile neutrino to be an unparticle, namely an "unsterile" neutrino, and study its mixing with a canonical active neutrino via a see-saw mass matrix. There is no unitary transformation that diagonalizes the mixed propagator and a field redefinition is required. The unsterile-like propagating mode features a resonance for anomalous dimension between 0 and 1/3, but the complex pole disappears when the anomalous dimension is larger than 1/3. The active-like propagating mode is described by a stable pole, but inherits a nonvanishing spectral density above the unparticle threshold. We also find that the radiative decay width of the unsterile neutrino into the active neutrino (and a photon) via charged current loops is suppressed, and this suppression weakens the bound from the X-ray or soft gamma-ray background when one considers the unsterile neutrino to be a dark matter candidate.

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Unsterile-active neutrino mixing: Consequences on radiative decay and bounds from the x-ray background

Cited by 5 publications

References 118 publications

Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

Oscillation dynamics of active-unsterile neutrino mixing in a2+1˜mixing scheme

Charged lepton mixing via heavy sterile neutrinos

Unsterile-Active Neutrino Mixing

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