Highlights from Super-Kamiokande

Okumura, K.

doi:10.1051/epjconf/201612602023

Cited by 3 publications

(4 citation statements)

References 33 publications

(10 reference statements)

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“…Thanks to recent tremendous progress in neutrino oscillation experiments, a few large water-Cherenkov (WC), liquid-scintillator (LS) and liquid-argon time projection chamber (LAr-TPC) neutrino detectors have already been in operation (e.g., Super-Kamiokande [12],…”

Section: Introductionmentioning

confidence: 99%

Towards a complete reconstruction of supernova neutrino spectra in future large liquid-scintillator detectors

Li¹,

Li²,

Wang³

et al. 2018

Phys. Rev. D

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In this paper, we show how to carry out a relatively more realistic and complete reconstruction of supernova neutrino spectra in the future large liquid-scintillator detectors, by implementing the method of singular value decomposition with a proper regularization. For a core-collapse supernova at a distance of 10 kpc in the Milky Way, itsν e spectrum can be precisely determined from the inverse beta-decay processν e þ p → e þ þ n, for which a 20 kiloton liquid-scintillator detector with the resolution similar to the Jiangmen Underground Neutrino Observatory may register more than 5000 events. We have to rely predominantly on the elastic neutrino-electron scattering ν þ e − → ν þ e − and the elastic neutrino-proton scattering ν þ p → ν þ p for the spectra of ν e and ν x , where ν denotes collectively neutrinos and antineutrinos of all three flavors and ν x for ν μ and ν τ as well as their antiparticles. To demonstrate the validity of our approach, we also attempt to reconstruct the neutrino spectra by using the time-integrated neutrino data from the latest numerical simulations of delayed neutrino-driven supernova explosions.

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Section: Introductionmentioning

confidence: 99%

Towards a complete reconstruction of supernova neutrino spectra in future large liquid-scintillator detectors

Li¹,

Li²,

Wang³

et al. 2018

Phys. Rev. D

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show abstract

“…However, the sparse data from SN 1987A do not suffice for such a purpose [24]. For a galactic core-collapse SN at a distance around 10 kpc [25], a few large water-Cherenkov (WC), liquid-scintillator (LS) and liquid-argon time projection chamber (LAr-TPC) neutrino detectors worldwide that are in operation (e.g., Super-Kamiokande [26], Borexino [27] and KamLAND [28] ) or under construction (e.g., Hyper-Kamiokande [29], JUNO [30], and DUNE [31]) will register a large number of neutrino events and have a great potential to provide complete flavor information on SN neutrinos. First of all, the energy spectrum of ν e can be unambiguously determined via the inverse beta decay channel ν e + p → e + + n (IBD) in both WC and LS detectors.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model-independent approach to the reconstruction of multiflavor supernova neutrino energy spectra

Huang

et al. 2019

Phys. Rev. D

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The model-independent reconstruction of the energy spectra of ν e , ν e and ν x (i.e., ν µ , ν τ and their antiparticles) from the future observation of a galactic core-collapse supernova (SN) is of crucial importance to understand the microscopic physics of SN explosions. To this end, we propose a practically useful method to combine the multi-channel detection of SN neutrinos in a large liquidscintillator detector (e.g., JUNO), namely, the inverse beta decay ν e + p → e + + n, the elastic neutrino-proton scattering ν+p → ν+p and the elastic neutrino-electron scattering ν+e − → ν+e − , and reconstruct the energy spectra of ν e , ν e and ν x by making the best use of the observational data in those three channels. In addition, the neutrino energy spectra from the numerical simulations of the delayed neutrino-driven SN explosions are implemented to demonstrate the robustness of our method. Taking the ordinary matter effects into account, we also show how to extract the initial neutrino energy spectra in the presence of neutrino flavor conversions.

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“…However this did not require the world to be parity asymmetric, the way it is manifested in the Standard Model (SM). Indeed, the discovery of neutrino masses [1,2] [3][4][5] in the past two decades strongly suggests the existence of right handed neutrino states. The resulting parity balanced spectrum of fermions begs a parity symmetric theory and parity violation could then be explained to be of dynamical origin.…”

mentioning

confidence: 99%

Why PeV scale left–right symmetry is a good thing

Yajnik

2017

Pramana - J Phys

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Left-right symmetric gauge theory presents a minimal paradigm to accommodate massive neutrinos with all known conserved symmetries duly gauged. The work presented here is based on the argument that the see-saw mechanism does not force the new right handed symmetry scale to be very high, and as such some of the species from the spectrum of the new gauge and Higgs bosons can have masses within a few orders of magnitude of the TeV scale. The scale of the left-right parity breaking in turn can be sequestered from the Planck scale by supersymmetry. We have studied several formulations of such Just Beyond Standard Model (JBSM) theories for their consistency with cosmology. Specifically the need to eliminate phenomenologically undesirable domain walls gives many useful clues. The possibility that the exact left-right symmetry breaks in conjunction with supersymmetry has been explored in the context of gauge mediation, placing restrictions on the available parameter space. Finally we have also studied a left-right symmetric model in the context of metastable supersymmetric vacua and obtained constraints on the mass scale of Right handed symmetry. In all the cases studied, The mass scale of right handed neutrino M R remains bounded from above, and in some of the cases the scale 10 9 GeV favourable for supersymmetric thermal leptogenesis is disallowed. On the other hand PeV scale remains a viable option, and the results warrant a more detailed study of such models for their observability in collider and astroparticle experiments.

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Highlights from Super-Kamiokande

Cited by 3 publications

References 33 publications

Towards a complete reconstruction of supernova neutrino spectra in future large liquid-scintillator detectors

Towards a complete reconstruction of supernova neutrino spectra in future large liquid-scintillator detectors

Model-independent approach to the reconstruction of multiflavor supernova neutrino energy spectra

Why PeV scale left–right symmetry is a good thing

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