@misc{10481/77344,
year = {2022},
month = {9},
url = {https://hdl.handle.net/10481/77344},
abstract = {The 4.2 sigma tension in the combined measurement of the anomalous magnetic moment of the muon, alpha(mu), and the Standard Model prediction strongly suggests the existence of beyond the Standard Model physics. Following the Standard Model Effective Field Theory approach, we study a particular topology, the bridge diagram, which gives a chirally enhanced contribution to a(mu) . We classify all possible 2- and 3-field SM extensions that can generate this contribution and present the full a(mu), result for them. Within our approach, we find that several 2-field fermion-scalar extensions which had been previously discarded in the literature when only the Yukawa-suppressed contribution was considered can actually be viable models to explain the observed anomaly. Furthermore, the 3-field extensions which generate the bridge diagram represent a new class of models to account for a(mu). We explore a particular 3-field extension which, beyond explaining a(mu), can also account for the neutral B-meson anomalies and the Cabibbo angle anomaly. We present the full one-loop matching for this model and a one-loop phenomenological study.},
organization = {Portuguese Foundation for Science and Technology},
organization = {European Commission	CERN/FIS-PAR/0032/2021	
SFRH/BD/144244/2019},
organization = {European Commission	POCI-01-0145-FEDER007334	
INCD	CPCA-A1-401197-2021	
P18-FR-4314},
organization = {Ministry of Science and Innovation and SRA	PID2019-106087GB-C22},
organization = {Junta de Andalucia	FQM 101},
organization = {Spanish Government},
publisher = {Springer},
keywords = {SMEFT},
keywords = {Specific BSM Phenomenology},
keywords = {Vector-Like Fermions},
keywords = {Semi-Leptonic Decays},
title = {A bridge to new physics: proposing new — and reviving old — explanations of aμ},
doi = {10.1007/JHEP09(2022)181},
author = {Guedes, Guilherme and Olgoso Ruiz, Pablo},
}