New astrophysical constraint on radiatively decaying neutrinos

doi:https://doi.org/10.1103/PhysRevD.54.1301

Title: New astrophysical constraint on radiatively decaying neutrinos

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Abstract

We calculate constraints on radiatively decaying neutrinos from the recent detection of singly ionized helium in the diffuse intergalactic medium (IGM) at {ital z}{approx_equal}3.3. We consider a model in which neutrinos predominantly decay into invisible relativistic particles with a rate {tau}{sup {minus}1}, and with a small branching ratio into the radiative mode. To satisfy the observation, which puts a lower bound on the number density of singly ionized helium atoms in the IGM, we show that, for {tau}{approx_gt}10{sup 18} sec (1 eV/{ital m}{sub {nu}}{sup 2}), transition moment of neutrinos, {mu}{sub 12}, is constrained to be {le}4{endash}8{times}10{sup {minus}17} {mu}{sub {ital B}} for 110 eV{approx_lt}{ital m}{sub {nu}}{approx_lt}10 keV. Implications of this bound for particle physics and cosmology are briefly discussed. {copyright} {ital 1996 The American Physical Society.}

Authors:

Sethi, S K ^[1]

Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India)

Publication Date:: 1996-07-01

OSTI Identifier:: 288205

Resource Type:: Journal Article

Journal Name:: Physical Review, D

Additional Journal Information:: Journal Volume: 54; Journal Issue: 2; Other Information: PBD: Jul 1996

Country of Publication:: United States

Language:: English

Subject:: 66 PHYSICS; NEUTRINOS; RADIATIVE DECAY; LIMITING VALUES; DETECTION; IONIZATION; HELIUM; BRANCHING RATIO; COSMOLOGY

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                    Sethi, S K. New astrophysical constraint on radiatively decaying neutrinos.  United States: N. p., 1996. 
        Web.  doi:10.1103/PhysRevD.54.1301.

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                    Sethi, S K. New astrophysical constraint on radiatively decaying neutrinos.  United States.  https://doi.org/10.1103/PhysRevD.54.1301

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                    Sethi, S K. Mon .  
        "New astrophysical constraint on radiatively decaying neutrinos".  United States.  https://doi.org/10.1103/PhysRevD.54.1301.

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@article{osti_288205,

  title        = {New astrophysical constraint on radiatively decaying neutrinos},

  author       = {Sethi, S K},

  abstractNote = {We calculate constraints on radiatively decaying neutrinos from the recent detection of singly ionized helium in the diffuse intergalactic medium (IGM) at {ital z}{approx_equal}3.3. We consider a model in which neutrinos predominantly decay into invisible relativistic particles with a rate {tau}{sup {minus}1}, and with a small branching ratio into the radiative mode. To satisfy the observation, which puts a lower bound on the number density of singly ionized helium atoms in the IGM, we show that, for {tau}{approx_gt}10{sup 18} sec (1 eV/{ital m}{sub {nu}}{sup 2}), transition moment of neutrinos, {mu}{sub 12}, is constrained to be {le}4{endash}8{times}10{sup {minus}17} {mu}{sub {ital B}} for 110 eV{approx_lt}{ital m}{sub {nu}}{approx_lt}10 keV. Implications of this bound for particle physics and cosmology are briefly discussed. {copyright} {ital 1996 The American Physical Society.}},

  doi          = {10.1103/PhysRevD.54.1301},

  url          = {https://www.osti.gov/biblio/288205},
  journal      = {Physical Review, D},
number       = 2,

  volume       = 54,

  place        = {United States},

  year         = {1996},

  month        = {7}

}

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