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Primordial Nucleosynthesis, Majorons and Heavy Tau Neutrinos
High Energy Physics - Phenomenology · Submitted 28 Oct 1996
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that for theoretically plausible $g$ values $\gsim 10^{-4}$ present nucleosynthesis observations can not rule out nu-tau masses in the MeV range.
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The abstract, sentence by sentence
We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of nu-tau annihilations into Majorons, as expected in a wide class of particle physics models of neutrino mass. We determine the equivalent number of light neutrino species $N_{eq}$ as a function of nu-tau mass and the nu-tau-Majoron coupling $g$. We show that for theoretically plausible $g$ values $\gsim 10^{-4}$ present nucleosynthesis observations can not rule out nu-tau masses in the MeV range. Moreover, these models give $N_{eq} \leq 3$ in the nu-tau mass region 1-10 MeV, for very reasonable values of $g \geq 3 \times 10^{-4}$. The evasion of the cosmological limits brings new interest to the improvement of the present laboratory limit on the nu-tau mass which can be achieved at a tau-charm factory.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of nu-tau annihilations into Majorons, as expected in a wide class of particle physics models of neutrino mass. | contribution 0.98 | 0.91 | 0.09 | asserted 0.94 |
| s1 | We determine the equivalent number of light neutrino species $N_{eq}$ as a function of nu-tau mass and the nu-tau-Majoron coupling $g$. | contribution 0.76 | 0.94 | 0.08 | asserted 0.99 |
| s2 | We show that for theoretically plausible $g$ values $\gsim 10^{-4}$ present nucleosynthesis observations can not rule out nu-tau masses in the MeV range. | result 0.98 | 0.87 | 0.59 | asserted 0.94 |
| s3 | Moreover, these models give $N_{eq} \leq 3$ in the nu-tau mass region 1-10 MeV, for very reasonable values of $g \geq 3 \times 10^{-4}$. | result 1.00 | 0.89 | 0.26 | asserted 1.00 |
| s4 | The evasion of the cosmological limits brings new interest to the improvement of the present laboratory limit on the nu-tau mass which can be achieved at a tau-charm factory. | interpretation 0.55 | 0.15 | 0.11 | asserted 0.84 |
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Original abstract
We determine the restrictions imposed by primordial nucleosynthesis upon a heavy tau neutrino, in the presence of nu-tau annihilations into Majorons, as expected in a wide class of particle physics models of neutrino mass. We determine the equivalent number of light neutrino species $N_{eq}$ as a function of nu-tau mass and the nu-tau-Majoron coupling $g$. We show that for theoretically plausible $g$ values $\gsim 10^{-4}$ present nucleosynthesis observations can not rule out nu-tau masses in the MeV range. Moreover, these models give $N_{eq} \leq 3$ in the nu-tau mass region 1-10 MeV, for very reasonable values of $g \geq 3 \times 10^{-4}$. The evasion of the cosmological limits brings new interest to the improvement of the present laboratory limit on the nu-tau mass which can be achieved at a tau-charm factory.
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Papers whose main result relates to this one's
States the same result 1 paper
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We show that in the presence of sufficiently strong tau neutrino annihilations into majorons, the primordial nucleosynthesis constraints can not rule out tau neutrino masses in the MeV range.
Limits on the tau neutrino mass from nucleosynthesis in the presence of annihilation into majorons · 0.99
Papers citing it
Cites it as background 1 paper
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We note that similar phenomenology has been studied in the past when the $τ$-neutrino was still allowed to be a mass eigenstate and considerably heavy ($m_ν_τ <23 MeV$), see e.g. [ref] .
Cosmological Constraints on Invisible Neutrino Decays Revisited · Introduction · 0.94
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