Neutrino nonstandard interactions via light scalars in the Earth, Sun, supernovae, and the early Universe

Babu, K. S.; Chauhan, Garv; Dev, P. S. Bhupal

doi:10.1103/physrevd.101.095029

“…[25][26][27] is a pseudo-scalar boson, in this work we compute loop-induced interactions for a generic scalar and take three lepton flavors into account, with loop calculation details presented. The loop-induced interactions computed in this work could be of importance in phenomenological studies of long-range forces [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 87%

The νR-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations

Xu

¹

2020

J. High Energ. Phys.

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Right-handed neutrinos (νR) are often considered as a portal to new hidden physics. It is tempting to consider a gauge singlet scalar (ϕ) that exclusively couples to νR via a νRνRϕ term. Such a νR-philic scalar does not interact with charged fermions at tree level but loop-induced effective interactions are inevitable, which are systematically investigated in this work. The magnitude of the loop-induced couplings coincidentally meets the current sensitivity of fifth-force searches. In particular, the loop-induced coupling to muons could be tested in the recent LIGO observations of neutron star mergers as there might be a sizable Yukawa force in the binary system mediated by the νR-philic scalar.

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“…Here, as shown in ref. [101], y e is bounded by electron g − 2 (y e < 3.4 × 10 −6 ), fifth force experiments (y e < 10 −24 ), and by supernova neutrino observations (y e < 5×10 −30 -as any larger value would make m eff ν > 5 MeV, with a fixed y ν ). The choice of m φ = 2 × 10 −14 eV coincides with the inverse size of red giants.…”

Section: Mechanism To Evade Astrophysical Limits On Neutrino Magneticmentioning

confidence: 97%

“…We shall closely follow the recent field theoretic evaluation of the medium-dependent mass of the neutrino in the presence of a light scalar that also couples to ordinary matter [101] in illustrating our mechanism. This work follows the observation that such interactions would provide the neutrino with a matter-dependent mass [102].…”

Section: Mechanism To Evade Astrophysical Limits On Neutrino Magneticmentioning

confidence: 99%

“…Ref. [101] analyzed phenomenological constraints from laboratory experiments, fifth force experiments, astrophysics and cosmology. We shall make use of these constraints here in providing a neutrino trapping mechanism.…”

Section: Mechanism To Evade Astrophysical Limits On Neutrino Magneticmentioning

confidence: 99%

“…These interactions induce a finite density neutrino mass through the diagram shown in figure 19. Using quantum field theory at finite temperature and density the induced neutrino mass arising from such diagrams has been computed to be[101] ∆m ν,αβ = y n f (k 0 ) + nf (k 0 ) . (8.2) Here n f and nf are the occupations numbers of the background fermions and antifermions.…”

mentioning

confidence: 99%

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Large neutrino magnetic moments in the light of recent experiments

Babu

¹

,

Jana

²

,

Lindner

³

2020

J. High Energ. Phys.

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The excess in electron recoil events reported recently by the XENON1T experiment may be interpreted as evidence for a sizable transition magnetic moment $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ of Majorana neutrinos. We show the consistency of this scenario when a single component transition magnetic moment takes values $$ {\mu}_{v_e{v}_{\mu }}\in \left(1.65-3.42\right)\times {10}^{-11}{\mu}_B $$ μ v e v μ ∈ 1.65 − 3.42 × 10 − 11 μ B . Such a large value typically leads to unacceptably large neutrino masses. In this paper we show that new leptonic symmetries can solve this problem and demonstrate this with several examples. We first revive and then propose a simplified model based on SU(2)H horizontal symmetry. Owing to the difference in their Lorentz structures, in the SU(2)H symmetric limit, mν vanishes while $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ is nonzero. Our simplified model is based on an approximate SU(2)H, which we also generalize to a three family SU(3)H-symmetry. Collider and low energy tests of these models are analyzed. We have also analyzed implications of the XENON1T data for the Zee model and its extensions which naturally generate a large $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ with suppressed mν via a spin symmetry mechanism, but found that the induced $$ {\mu}_{v_e{v}_{\mu }} $$ μ v e v μ is not large enough to explain recent data. Finally, we suggest a mechanism to evade stringent astrophysical limits on neutrino magnetic moments arising from stellar evolution by inducing a medium-dependent mass for the neutrino.

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Imprints of scalar NSI on the CP-violation sensitivity using synergy among DUNE, T2HK and T2HKK

Medhi

¹

,

Devi

²

,

Dutta

³

2023

J. High Energ. Phys.

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The Non-Standard Interactions (NSIs) are subdominant effects, often appearing in various extensions of SM, which may impact the neutrino oscillations through matter. It is important and interesting to explore the impact of NSIs in the ongoing and upcoming precise neutrino oscillations experiments. In this work, we have studied the imprints of a scalar-mediated NSI in three upcoming long-baseline (LBL) experiments (DUNE, T2HK and T2HKK). The effects of scalar NSI appears as a medium-dependent correction to the neutrino mass term. Its contribution scales linearly with matter density, making LBL experiments a suitable candidate to probe its effects. We show that the scalar NSI may significantly impact the oscillation probabilities, event rates at the detectors and the χ2-sensitivities of δCP measurements. We present the results of a combined analysis involving the LBL experiments (DUNE+T2HK or DUNE+T2HKK) which offer a better capability of constraining the scalar NSI parameters as well as an improved sensitivity towards CP-violation.

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Neutrino nonstandard interactions via light scalars in the Earth, Sun, supernovae, and the early Universe

Cited by 63 publications

References 39 publications

The νR-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations

The νR-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations

Large neutrino magnetic moments in the light of recent experiments

Imprints of scalar NSI on the CP-violation sensitivity using synergy among DUNE, T2HK and T2HKK

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