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Flavor phenomenology of the leptoquark singlet-triplet model
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Journal Article
Flavor phenomenology of the leptoquark singlet-triplet model
2020
Overview
A
bstract
In recent years, experiments revealed intriguing hints for new physics (NP) in semi-leptonic
B
decays. Both in charged current processes, involving
b → cτν
transitions, and in the neutral currents
b → sℓ
+
ℓ
−
, a preference for NP compared to the standard model (SM) of more that 3
σ
and 5
σ
was found, respectively. In addition, there is the long-standing tension between the theory prediction and the measurement of the anomalous magnetic moment (AMM) of the muon (
a
μ
) of more than 3
σ
. Since all these observables are related to the violation of lepton flavor universality (LFU), a common NP explanation seems not only plausible but is even desirable. In this context, leptoquarks (LQs) are especially promising since they give tree-level effects in semi-leptonic
B
decays, but only loop-suppressed effects in other flavor observables that agree well with their SM predictions. Furthermore, LQs can lead to a
m
t
/
m
μ
enhanced effect in
a
μ
, allowing for an explanation even with (multi) TeV particles. However, a single scalar LQ representation cannot provide a common solution to all three anomalies. In this article we therefore consider a model in which we combine two scalar LQs: the SU(2)
L
singlet and the SU(2)
L
triplet. Within this model we compute all relevant 1-loop effects and perform a comprehensive phenomenological analysis, pointing out various interesting correlations among the observables. Furthermore, we identify benchmark points which are in fact able to explain all three anomalies (
b → cτν
,
b → sℓ
+
ℓ
−
and
a
μ
), without violating bounds from other observables, and study their predictions for future measurements.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen
