Improved big bang nucleosynthesis constraints on heavy neutral leptons
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Improved big bang nucleosynthesis constraints on heavy neutral leptons. / Boyarsky, A.; Ovchynnikov, M.; Ruchayskiy, O.; Syvolap.
I: Physical Review D, Bind 104, Nr. 2, 023517, 16.07.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Improved big bang nucleosynthesis constraints on heavy neutral leptons
AU - Boyarsky, A.
AU - Ovchynnikov, M.
AU - Ruchayskiy, O.
AU - Syvolap, null
PY - 2021/7/16
Y1 - 2021/7/16
N2 - We constrain the lifetime of thermally produced heavy neutral leptons (HNLs) from big bang nucleosynthesis. We show that even a small fraction of mesons present in the primeval plasma leads to the overproduction of primordial helium-4. This constrains the lifetime of HNLs to be tau(N) < 0.02 s for masses above the mass of the pion (as compared to 0.1 s reported previously). In combination with accelerator searches, this allows us to put a new lower bound on the HNL masses and define the "bottom line" for HNL searches at the future Intensity Frontier experiments.
AB - We constrain the lifetime of thermally produced heavy neutral leptons (HNLs) from big bang nucleosynthesis. We show that even a small fraction of mesons present in the primeval plasma leads to the overproduction of primordial helium-4. This constrains the lifetime of HNLs to be tau(N) < 0.02 s for masses above the mass of the pion (as compared to 0.1 s reported previously). In combination with accelerator searches, this allows us to put a new lower bound on the HNL masses and define the "bottom line" for HNL searches at the future Intensity Frontier experiments.
KW - PRIMORDIAL HELIUM ABUNDANCE
KW - STERILE NEUTRINOS
KW - DARK-MATTER
KW - BOUNDS
KW - VMSM
U2 - 10.1103/PhysRevD.104.023517
DO - 10.1103/PhysRevD.104.023517
M3 - Journal article
VL - 104
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 2
M1 - 023517
ER -
ID: 276162860