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Title: New astrophysical constraint on radiatively decaying neutrinos

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:
 [1]
  1. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007 (India)
Publication Date:
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

Citation Formats

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