Search for sterile neutrinos at the DANSS experiment

Alekseev, I.; Belov, V.; Brudanin, V.; Danilov, M.; Egorov, V.; Filosofov, D.; Fomina, M.; Hons, Z.; Kazartsev, S.; Kobyakin, A. S.; Kuznetsov, A. N.; Machikhiliyan, I. V.; Medvedev, D. V.; Nesterov, V. M.; Оlshevsky, А.G.; Pogorelov, N; Ponomarev, Dmitry; Rozova, I.; Rumyantseva, N.; Rusinov, V.; Samigullin, E.; Shevchik, E.; Shirchenko, M.; Shitov, Yu.; Skrobova, N.; Старостин, А. С.; Svirida, D. N.; Tarkovsky, E.; Vlasek, J.; Zhitnikov, I.; Zinatulina, D.

doi:10.1016/j.physletb.2018.10.038

Cited by 183 publications

(170 citation statements)

References 19 publications

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“…[28]. Additionally, we display (3 black vertical elliptical contours) the anomalous signal regions from DANSS [29] and NEOS [30] data, following Fig. 4 of Ref.…”

Section: Constraints and Regions Of Interestmentioning

confidence: 99%

“…While the three-flavor paradigm of active neutrino oscillations has been extensively tested [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], several laboratory anomalies 1 (e.g. LSND [26] and MiniBooNE [27,28] as well as DANSS [29] and NEOS [30]) appear to be consistent with additional sterile neutrinos of m s = O(eV) mass. Reactor neutrino data [31][32][33] constrain these sterile neutrinos and future data from the PTOLEMY [34] and KATRIN [35] experiments will further test them.…”

Section: Introductionmentioning

confidence: 99%

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Cosmological dependence of non-resonantly produced sterile neutrinos

Gelmini¹,

Lu²,

Takhistov³

2019

J. Cosmol. Astropart. Phys.

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The detection of a sterile neutrino could constitute the first observation of a particle that could have been produced before Big-Bang Nucleosynthesis (BBN), and could provide information about the yet untested pre-BBN era. The cosmological evolution in this era could be drastically different than typically assumed, in what constitutes the standard cosmology, as happens in a variety of motivated particle models. In this work we assess the sensitivity to different pre-BBN cosmologies in which entropy is conserved of 0.01 eV to 1 MeV mass sterile neutrinos produced in the early Universe via resonant active-sterile oscillations, which requires a large lepton asymmetry. We identify mass ranges where it is possible to have two populations of the same sterile neutrino, one with a colder and one with a hotter momentum spectra, which is in principle an observable effect. Furthermore, we show the regions in mass and mixing where fully resonant production (i.e. simultaneously coherent and adiabatic) can occur. We find that in all the cosmologies we consider, including the standard one, fully resonantly produced sterile neutrinos in the eV-mass range can evade all cosmological constraints.In the absence of a large lepton asymmetry the oscillations are non-resonant and sterile neutrinos are produced via the Dodelson-Widrow (DW) mechanism [45]. In the standard cosmology this mechanism results in a Fermi-Dirac relic momentum distribution of sterile neutrinos, with a reduced magnitude with respect to active neutrinos. Several studies have already been carried out on non-resonantly produced sterile neutrinos in different pre-BBN cosmologies ). This work is complementary to these previous studies in that we concentrate on the production of sterile neutrinos via resonant active-sterile oscillations, an often considered production mechanism that requires a significant lepton asymmetry in active neutrinos (this is the Shi-Fuller mechanism [52], see also Ref. [53,54]). In this case, sterile neutrinos are produced with a colder momentum distribution (i.e. with a lower average momentum) that is different from a Fermi-Dirac spectrum, even in the standard cosmology. In particular, we study the effect of different cosmologies on resonantly produced sterile neutrinos with mass 10 −2 eV < m s < 1 MeV. Since the production rate is usually not fast enough for sterile neutrinos to equilibrate, the final relic abundance and spectrum are fixed by freeze-in.We will analyze resonant sterile neutrino production within several example cosmological models in which entropy is conserved, characterized by the magnitude and temperature dependence of the Hubble expansion rate H in the non-standard cosmological phase. If H is larger than it would be in the standard cosmology, the resonant production of sterile neutrinos during this phase is suppressed with respect to standard production, and if H is lower, the production is enhanced. If the production is fully resonant, which requires adiabaticity and coherence at the resonance, the relic sterile neutrino ...

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“…[28]. Additionally, we display (3 black vertical elliptical contours) the anomalous signal regions from DANSS [29] and NEOS [30] data, following Fig. 4 of Ref.…”

Section: Constraints and Regions Of Interestmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cosmological dependence of non-resonantly produced sterile neutrinos

Gelmini¹,

Lu²,

Takhistov³

2019

J. Cosmol. Astropart. Phys.

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show abstract

“…(3+1) and (3+2) phenomenological models. While recent reactor experiments such as DANSS [123] and NEOS [124] have improved the statistical significance of an additional eV-scale sterile state, when combined with the ν e appearance data of MiniBooNE they are in strong tension with the observed ν µ → ν µ accelerator neutrino disappearance of the MINOS, NOνA and IceCube experiments.…”

Section: Active-sterile Neutrino Oscillationsmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

161

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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“…A great deal of experimental evidence suggests that there are two non-zero mass-squared splittings, commonly referred to as the "atmospheric mass splitting" ∆m 2 31 ≈ 2.5 × 10 −3 eV 2 [15][16][17] and the "solar mass splitting" 1 ∆m 2 21 ≈ 7 × 10 −5 eV 2 [19][20][21][22][23]. Anomalous experimental results -among them the LSND, MiniBooNE, and short-baseline reactor antineutrino experiments -provide hints of a new mass splitting ∆m 2 ∼ 1 eV 2 [11,[24][25][26].…”

Section: Low-energy Long Distance Oscillationsmentioning

confidence: 99%

Prospects of measuring oscillated decay-at-rest neutrinos at long baselines

2020

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In addition to the next generation of beam-based neutrino experiments and their associated detectors, a number of intense, low-energy neutrino production sources from decays at rest will be in operation. In this work, we explore the physics opportunities with decay-at-rest neutrinos for complementary measurements of oscillation parameters at long baselines. The J-PARC Spallation Neutron Source, for example, will generate neutrinos from a variety of decay-at-rest (DAR) processes, specifically those of pions, muons, and kaons. Other proposed sources will produce large numbers of stopped pions and muons. We demonstrate the ability of the upcoming Hyper-Kamiokande experiment to detect the monochromatic kaon decay-at-rest neutrinos from J-PARC after they have travelled several hundred kilometers and undergone oscillations. This measurement will serve as a valuable cross-check in constraining our understanding of neutrino oscillations in a new regime of neutrino energy and baseline length. We also study the expected event rates from pion and muon DAR neutrinos in liquid Argon and water detectors and their sensitivities to to the CP violating phase δCP.

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Search for sterile neutrinos at the DANSS experiment

Cited by 183 publications

References 19 publications

Cosmological dependence of non-resonantly produced sterile neutrinos

Cosmological dependence of non-resonantly produced sterile neutrinos

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Prospects of measuring oscillated decay-at-rest neutrinos at long baselines

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