ρ parameter and H 0 → ℓ i ℓ j in models with TeV sterile neutrinos
Metadatos
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AMER PHYSICAL SOC
Fecha
2020Referencia bibliográfica
Hernández-Tomé, G., Illana, J. I., & Masip, M. (2020). ρ parameter and H 0→ ℓ i ℓ j in models with TeV sterile neutrinos. Physical Review D, 102(11), 113006. [DOI: 10.1103/PhysRevD.102.113006]
Patrocinador
Spanish Ministry of Science, Innovation and Universities FPA2016-78220-C3 PID2019-107844GB-C21/AEI/10.13039/501100011033; Junta de Andalucia FQM 101 SOMM17/6104/UGR P18-FR-1962 P18-FR-5057; Consejo Nacional de Ciencia y Tecnologia (CONACyT)Resumen
The presence of massive sterile neutrinos
N
mixed with the active ones induces flavor violating processes in the charged lepton sector at the loop level. In particular, the amplitude of
H
0
→
¯
ℓ
i
ℓ
j
is expected to be proportional to the product of heavy-light Yukawa couplings
y
i
y
j
=
2
s
ν
i
s
ν
j
m
2
N
/
v
2
, where
s
ν
i
,
j
express the heavy-light neutrino mixings. Here, we revisit these Higgs decays in the most generic extension of the neutrino sector, focusing on large values of
y
i
. We show that decoupling effects and a cancellation between the two dominant contributions to these processes makes the amplitude about 100 times smaller than anticipated. We find that perturbative values of
y
i
giving an acceptable contribution to the
ρ
parameter imply
B
(
H
0
→
¯
ℓ
i
ℓ
j
)
<
10
−
8
for any lepton flavors, a rate that is not accessible at current colliders.