The β-spectrum of 35S and search for the admixture of heavy neutrinos

Holzschuh, E.; Palermo, L.; Stüssi, H.; Wenk, Paul

doi:10.1016/s0370-2693(00)00476-7

Cited by 43 publications

(25 citation statements)

References 19 publications

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“…In Fig. 2 we report the most stringent limits, obtained by using different nuclei [76,77,78,79,80]. In reactors and in the Sun only low mass, m 4 < few MeV, heavy neutrinos can be produced.…”

Section: Mixing With ν Ementioning

confidence: 99%

The search for heavy Majorana neutrinos

Atre¹,

Han²,

Pascoli³

et al. 2009

J. High Energy Phys.

812

1,115

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The Majorana nature of neutrinos can be experimentally verified only via lepton-number violating processes involving charged leptons. We study 36 lepton-number violating (LV ) processes from the decays of tau leptons and pseudoscalar mesons. These decays are absent in the Standard Model but, in presence of Majorana neutrinos in the mass range ∼ 100 MeV to 5 GeV, the rates for these processes would be enhanced due to their resonant contribution. We calculate the transition rates and branching fractions and compare them to the current bounds from direct experimental searches for ∆L = 2 tau and rare meson decays. The experimental non-observation of such LV processes places stringent bounds on the Majorana neutrino mass and mixing and we summarize the existing limits. We also extend the search to hadron collider experiments. We find that, at the Tevatron with 8 fb −1 integrated luminosity, there could be 2σ (5σ) sensitivity for resonant production of a Majorana neutrino in the µ ± µ ± modes in the mass range of ∼ 10 − 180 GeV (10 − 120 GeV). This reach can be extended to ∼ 10 − 375 GeV (10 − 250 GeV) at the LHC of 14 TeV with 100 fb −1 . The production cross section at the LHC of 10 TeV is also presented for comparison. We study the µ ± e ± modes as well and find that the signal could be large enough even taking into account the current bound from neutrinoless double-beta decay. The signal from the gauge boson fusion channel W + W + → ℓ + 1 ℓ + 2 at the LHC is found to be very weak given the rather small mixing parameters. We comment on the search strategy when a τ lepton is involved in the final state.

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Section: Mixing With ν Ementioning

confidence: 99%

The search for heavy Majorana neutrinos

Atre¹,

Han²,

Pascoli³

et al. 2009

J. High Energy Phys.

812

1,115

View full text Add to dashboard Cite

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“…For masses m H < 1 MeV the most sensitive searches have looked for kinks in the electron spectra of decays and have constrained the sterile-electron mixing to jU eH j 2 < 10 À2 -10 À3 [14][15][16][17][18]. The agreement with expectations of ft values for superallowed pure Fermi beta transitions also limits the mixing of massive neutrino and electron flavor [19][20][21].…”

Section: Introductionmentioning

confidence: 87%

New limits on heavy sterile neutrino mixing inB8decay obtained with the Borexino detector

Bellini¹,

Benziger²,

Bick³

et al. 2013

Phys. Rev. D

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If heavy neutrinos with mass m H ! 2m e are produced in the Sun via the decay 8 B ! 8 Be þ e þ þ H in a side branch of the pp chain, they would undergo the observable decay into an electron, a positron and a light neutrino H ! L þ e þ þ e À . In the present work Borexino data are used to set a bound on the existence of such decays. We constrain the mixing of a heavy neutrino with mass 1:5 MeV m H 14 MeV to be jU eH j 2 ð10 À3 À 4 Â 10 À6 Þ, respectively. These are tighter limits on the mixing parameters than obtained in previous experiments at nuclear reactors and accelerators.

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“…However, since the original publication in 2007 [12], where a cubic coefficient of −3.2±1.1 keV was found, and which would not have survived the present ±3σ selection cut, the mass precision for 35 S and the 35 Cl IAS at 5655 keV have evolved. The former is affected by the recent inclusion of a high precision measurement dating from 2000 [13], which unfortunately, had not been included in AME2003. The 35 Cl IAS precision evaluated by ENSDF in 2011 [14] has also been reduced by one order of magnitude.…”

Section: Cubic Imme D-coefficientsmentioning

confidence: 99%

Beyond the Isobaric Multiplet Mass Equation

MacCormick¹

2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

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Isospin is a fundamental symmetry in nature and can be used to gleam information on nuclear structure. Within the charge independence hypothesis of the nuclear force, the Coulomb energy component of nuclear mass can be described as an isospin dependent function through the Isobaric multiplet Mass Equation. This symmetry has been studied in a recent up-to-date and complete evaluation of ground state Isobaric Analogue State masses and the associated Isobaric Multiplet Mass Equation coefficients have been extracted. In this paper, isobaric multiplets beyond the standard first-order quadratic description are presented, and repercussions on future experimental programs are explored.

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The β-spectrum of 35S and search for the admixture of heavy neutrinos

Cited by 43 publications

References 19 publications

The search for heavy Majorana neutrinos

The search for heavy Majorana neutrinos

New limits on heavy sterile neutrino mixing inB8decay obtained with the Borexino detector

Beyond the Isobaric Multiplet Mass Equation

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