Running of oscillation parameters in matter with flavor-diagonal non-standard interactions of the neutrino

Agarwalla, Sanjib Kumar; Kao, Yee; Saha, Debashis; Takeuchi, Tatsu

doi:10.1007/jhep11(2015)035

Cited by 11 publications

(7 citation statements)

References 254 publications

(358 reference statements)

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“…1 Now, on top of that if NSI exist in Nature then the task becomes even more complex. Assuming the line-averaged constant Earth matter density for a given baseline, several authors have derived approximate analytical expressions for the neutrino oscillation probabilities 2 in the presence of SI [50][51][52][53][54][55][56][57][58][59][60][61] and SI+NSI [62][63][64][65][66][67][68][69][70].…”

Section: Jhep11(2021)094mentioning

confidence: 99%

“…There exist several studies in the literature investigating how the presence of SI and NSI affect the evolution of effective neutrino oscillation parameters (the mixing angles, mass-squared differences, and CP-violating phase) in matter with energy, and eventually how they modify the oscillation probabilities [55,57,[59][60][61][68][69][70][71][72][73][74][75][76][77][78]. In refs.…”

Section: Jhep11(2021)094mentioning

confidence: 99%

“…Similar approach is adopted by the authors in ref. [70] to show the evolution of mass-mixing parameters in the presence of lepton-flavor-conserving, non-universal NSI of the neutrino.…”

Section: Jhep11(2021)094mentioning

confidence: 99%

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Evolution of neutrino mass-mixing parameters in matter with non-standard interactions

Agarwalla

Das

Masud

et al. 2021

J. High Energ. Phys.

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We explore the role of matter effect in the evolution of neutrino oscillation parameters in the presence of lepton-flavor-conserving and lepton-flavor-violating neutral-current non-standard interactions (NSI) of the neutrino. We derive simple approximate analytical expressions showing the evolution of mass-mixing parameters in matter with energy in the presence of standard interactions (SI) and SI+NSI (considering both positive and negative values of real NSI parameters). We observe that only the NSI parameters in the (2,3) block, namely εμτ and (γ − β) ≡ (εττ− εμμ) affect the modification of θ23. Though all the NSI parameters influence the evolution of θ13, εeμ and εeτ show a stronger impact at the energies relevant for DUNE. The solar mixing angle θ12 quickly approaches to ∼ 90° with increasing energy in both SI and SI+NSI cases. The change in ∆$$ {m}_{21,m}^2 $$ m 21 , m 2 is quite significant as compared to ∆$$ {m}_{31,m}^2 $$ m 31 , m 2 both in SI and SI+NSI frameworks for the energies relevant for DUNE baseline. Flipping the signs of the NSI parameters alters the way in which mass-mixing parameters run with energy. We demonstrate the utility of our approach in addressing several important features related to neutrino oscillation such as: a) unraveling interesting degeneracies between θ23 and NSI parameters, b) estimating the resonance energy in presence of NSI when θ13 in matter becomes maximal, c) figuring out the required baselines and energies to have maximal matter effect in νμ → νe transition in the presence of different NSI parameters, and d) studying the impact of NSI parameters εμτ and (γ − β) on the νμ → νμ survival probability.

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Section: Jhep11(2021)094mentioning

confidence: 99%

Section: Jhep11(2021)094mentioning

confidence: 99%

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Evolution of neutrino mass-mixing parameters in matter with non-standard interactions

Agarwalla

Das

Masud

et al. 2021

J. High Energ. Phys.

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“…This is caused due to the fact that the (L e −L µ,τ )charge of the electron neutrino is opposite to that of muon or tau flavor, leading to new non-universal FDNC interactions of the neutrinos in matter on top of the SM W -exchange interactions between the matter electrons and the propagating electron neutrinos. These new flavor-dependent FDNC interactions alter the 'running' of the oscillation parameters in matter by considerable amount [111]. Another important point is that the large number of electrons inside the Sun and the long-range nature of interaction balance the smallness of coupling and generate noticeable potential.…”

Section: Abelian Gauged L E − L µτ Symmetriesmentioning

confidence: 99%

Exploring flavor-dependent long-range forces in long-baseline neutrino oscillation experiments

Chatterjee

Dasgupta

Agarwalla

2015

J. High Energ. Phys.

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The Standard Model gauge group can be extended with minimal matter content by introducing anomaly free U(1) symmetry, such as L e − L µ or L e − L τ . If the neutral gauge boson corresponding to this abelian symmetry is ultra-light, then it will give rise to flavor-dependent long-range leptonic force, which can have significant impact on neutrino oscillations. For an instance, the electrons inside the Sun can generate a flavor-dependent long-range potential at the Earth surface, which can suppress the ν µ → ν e appearance probability in terrestrial experiments. The sign of this potential is opposite for anti-neutrinos, and affects the oscillations of (anti-)neutrinos in different fashion. This feature invokes fake CP-asymmetry like the SM matter effect and can severely affect the leptonic CP-violation searches in long-baseline experiments. In this paper, we study in detail the possible impacts of these long-range flavor-diagonal neutral current interactions due to L e − L µ symmetry, when (anti-)neutrinos travel from Fermilab to Homestake (1300 km) and CERN to Pyhäsalmi (2290 km) in the context of future high-precision superbeam facilities, DUNE and LBNO respectively. If there is no signal of long-range force, DUNE (LBNO) can place stringent constraint on the effective gauge coupling α eµ < 1.9 × 10 −53 (7.8 × 10 −54 ) at 90% C.L., which is almost 30 (70) times better than the existing bound from the Super-Kamiokande experiment. We also observe that if α eµ ≥ 2 × 10 −52 , the CP-violation discovery reach of these future facilities vanishes completely. The mass hierarchy measurement remains robust in DUNE (LBNO) if α eµ < 5 × 10 −52 (10 −52 ).1 Two patterns of neutrino masses are possible: m3 > m2 > m1, called normal hierarchy (NH) where ∆m 2 31 > 0 and m2 > m1 > m3, called inverted hierarchy (IH) where ∆m 2 31 < 0.

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“…The transition probability of the appearance channel ν µ − ν τ in the presence of matter effect and NSI along propagation is given as [32][33][34][35] …”

mentioning

confidence: 99%

Determination of mass hierarchy with νμ → ντ appearance and the effect of nonstandard interactions

Rashed

Datta

2017

Int. J. Mod. Phys. A

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Crucial developments in neutrino physics would be the determination of the mass hierarchy (MH) and measurement of the CP phase in the leptonic sector. The patterns of the transition probabilities P (νµ → ντ ) and P (νµ →ντ ) are sensitive to these oscillation parameters. An asymmetry parameter can be defined as the difference of these two probabilities normalized to their sum. The profile of the asymmetry parameter gives a clear signal of the mass ordering as it is found to be positive for inverted hierarchy and negative for normal hierarchy. The asymmetry parameter is also sensitive to the CP phase. We consider the effects of non-standard neutrino interactions (NSI) on the determination of the mass hierarchy. Since we assume the largest new physics effects involve the τ sector only, we ignore NSI in production and study the NSI effects in detection as well as along propagation. We find that the NSI effects can significantly modify the prediction of the asymmetry parameter though the MH can still be resolved. PACS numbers:After ruling out the zero value of the smallest mixing angle θ 13 in the lepton sector with C.L. around 5σ [1], the main scope of the future experiments is to answer some open questions such as the absolute mass scale, mass hierarchy, and CP asymmetry in the lepton sector.Knowledge of the mass hierarchy has an impact on determining the neutrino absolute mass scale, CP asymmetry in the lepton sector, and the nature of the neutrino to be either Dirac or Majorana. Once the ordering of the neutrino mass states is determined, the uncertainty on the measurement of the CP-violating phase, δ CP , is significantly reduced. Measuring the mass ordering can cut down the domain for observation of a signal in the neutrinoless double beta decay experiments. Cosmological measurements are sensitive to the sum of neutrino masses, thus, knowledge of the mass hierarchy could help in determining the absolute neutrino mass scale.The mass hierarchy (MH) can be determined using different techniques. The transition probability from a neutrino flavor to another, in the presence of matter effect, is sensitive to the mass hierarchy. The shape of the oscillation profile can be used to infer the sign of ∆m 2 23 thereby indicating whether we have normal hierarchy (NH) or the inverted hierarchy (IH). The standard proposal is to use the appearance channel ν µ → ν e to measure MH. Determination of mass hierarchy is in the scope of several future experiments such as DUNE [2][3][4][5], 7], LBNO [8,9], and INO [10]. A variety of other experiments has some sensitivity to the mass hierarchy such as the reactor neutrino experiments JUNO (formerly known as Daya Bay II) and RENO as well as PINGU [11] at IceCube. The CP asymmetry can be measured in very long base line neutrino experiments such as LBNO (2300 km baseline length) and DUNE (1300 km baseline length) as well as Hyper-K (295 km baseline length). The existence of neutrino masses and mixing require physics beyond the standard model (SM). Hence it is not unexpected that neutrinos...

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Running of oscillation parameters in matter with flavor-diagonal non-standard interactions of the neutrino

Cited by 11 publications

References 254 publications

Evolution of neutrino mass-mixing parameters in matter with non-standard interactions

Evolution of neutrino mass-mixing parameters in matter with non-standard interactions

Exploring flavor-dependent long-range forces in long-baseline neutrino oscillation experiments

Determination of mass hierarchy with νμ → ντ appearance and the effect of nonstandard interactions

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