First measurements in search for keV sterile neutrino in tritium beta-decay in the Troitsk nu-mass experiment

Abdurashitov, J. N.; Belesev, A. I.; Chernov, V. G.; Geraskin, E. V.; Голубев, А. А.; Grigorieva, P. V.; Коротеев, Г. А.; Likhovid, N. A.; Nozik, Alexander; Pantuev, V.; Парфенов, В. И.; Skasyrskaya, A. K.; Tkachev, I.; Zadorozhny, S. V.

doi:10.1134/s0021364017120013

Cited by 27 publications

(32 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even rather conservative constraints give for the case of non-resonantly produced DM the bounds of m NRP > 8 keV from Lyman-α [30] and of m NRP > 5.7 keV [31] from phase space density. For the sterile neutrino with distribution (2.5) we can rescale the Green curves on top of the plots give the direct constraints from particle physics experiments [5][6][7]. Two solid white lines are projected sensitivity of Troitsk ν-mass after two stages of upgrade [29].…”

Section: Discussion Of Cosmological and Astrophysical Constraintsmentioning

confidence: 99%

“…The main problem is the production in the early Universe through the mixing with active neutrinos [3,4], leading to over-closure of the Universe. At the same time, direct laboratory bounds [5][6][7] on the active-sterile mixing in this mass range is reaching at most the mixing angles sin 2 (2θ) 10 −3 .…”

Section: Introductionmentioning

confidence: 94%

“…[22,23] for the case of similar mechanism for active neutrino. 7 Hereafter in this subsection T denotes the photon temperature. 8 Unless the oscillations begin at plasma temperature below 200 eV, which is the latest time when Dark Matter must appear in the Universe [24].…”

Section: Feebly Interacting Scalarmentioning

confidence: 99%

See 2 more Smart Citations

Hiding an elephant: heavy sterile neutrino with large mixing angle does not contradict cosmology

Bezrukov

Chudaykin

Gorbunov

2017

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Abstract. We study a model of a keV-scale sterile neutrino with a relatively large mixing with the Standard Model sector. Usual considerations predict active generation of such particles in the early Universe, which leads to constraints from the total Dark Matter density and absence of X-ray signal from sterile neutrino decay. These bounds together may deem any attempt of creation of the keV scale sterile neutrino in the laboratory unfeasible. We argue that for models with a hidden sector coupled to the sterile neutrino these bounds can be evaded, opening new perspectives for the direct studies at neutrino experiments such as Troitsk ν-mass and KATRIN. We estimate the generation of sterile neutrinos in scenarios with the hidden sector dynamics keeping the sterile neutrinos either massless or superheavy in the early Universe. In both cases the generation by oscillations from active neutrinos in plasma is suppressed.

show abstract

Section: Discussion Of Cosmological and Astrophysical Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

Hiding an elephant: heavy sterile neutrino with large mixing angle does not contradict cosmology

Bezrukov

Chudaykin

Gorbunov

2017

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…The explored mass range is determined by the retarding energies that have been measured: down to 6.6 keV in the integral and 5.6 keV below the endpoint in the differential mode. This enlarges the previously analyzed mass range of the Troitsk nu-mass experiment [9] by a factor of 3.…”

Section: Limit Settingmentioning

confidence: 71%

“…The exclusion is the actual realization given the measured data. The latest result of the Troitsk nu-mass collaboration is shown in black [9]. end, the fits were performed with a sterile neutrino admixture in the model over a grid of (m heavy , sin 2 (θ))-parameters.…”

Section: Limit Settingmentioning

confidence: 99%

Measurements with a TRISTAN prototype detector system at the “Troitsk nu-mass” experiment in integral and differential mode

et al. 2019

View full text Add to dashboard Cite

A: Sterile neutrinos emerge in minimal extensions of the Standard Model which can solve a number of open questions in astroparticle physics. For example, sterile neutrinos in the keV-mass range are viable dark matter candidates. Their existence would lead to a kink-like distortion in the tritium β-decay spectrum. In this work we report about the instrumentation of the Troitsk nu-mass experiment with a 7-pixel TRISTAN prototype detector and measurements in both differential and integral mode. The combination of the two modes is a key requirement for a precise sterile neutrino search, as both methods are prone to largely different systematic uncertainties. Thanks to the excellent performance of the TRISTAN detector at high rates, a sterile neutrino search up to masses of about 6 keV could be performed, which enlarges the previous accessible mass range by a factor of 3. Upper limits on the neutrino mixing amplitude in the mass range < 5.6 keV (differential) and < 6.6 keV (integral) are presented. These results demonstrate the feasibility of a sterile neutrino search as planned in the upgrade of the KATRIN experiment with the final TRISTAN detector and read-out system.

show abstract

Beta and neutrinoless double beta decays with KeV sterile fermions

Abada

Hernández-Cabezudo

Marcano

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

Motivated by the capability of the KATRIN experiment to explore the existence of KeV neutrinos in the [1 − 18.5] KeV mass range, we explore the viability of minimal extensions of the Standard Model involving sterile neutrinos (namely the 3 + N frameworks) and study their possible impact in both the beta energy spectrum and the neutrinoless double beta decay effective mass, for the two possible ordering cases for the light neutrino spectrum. We also explore how both observables can discriminate between motivated low-scale seesaw realizations involving KeV sterile neutrinos. Our study concerns the prospect of a Type-I seesaw with two right-handed neutrinos, and a combination of the inverse and the linear seesaws where the Standard Model is minimally extended by two quasi-degenerate sterile fermions. We also discuss the possibility of exploring the latter case searching for doublekinks in KATRIN.

show abstract

First measurements in search for keV sterile neutrino in tritium beta-decay in the Troitsk nu-mass experiment

Cited by 27 publications

References 17 publications

Hiding an elephant: heavy sterile neutrino with large mixing angle does not contradict cosmology

Hiding an elephant: heavy sterile neutrino with large mixing angle does not contradict cosmology

Measurements with a TRISTAN prototype detector system at the “Troitsk nu-mass” experiment in integral and differential mode

Beta and neutrinoless double beta decays with KeV sterile fermions

Contact Info

Product

Resources

About