The ALPs from the top: searching for long lived axion-like particles from exotic top decays
Metadatos
Afficher la notice complèteAuteur
Carmona Bermúdez, AdriánEditorial
Springer
Materia
Axions and ALPs New Light Particles Top FCNC
Date
2022-07-19Referencia bibliográfica
Carmona, A... [et al.]. The ALPs from the top: searching for long lived axion-like particles from exotic top decays. J. High Energ. Phys. 2022, 122 (2022). [https://doi.org/10.1007/JHEP07(2022)122]
Patrocinador
European Commission 754446; UGR Research and Knowledge Transfer Found-Athenea3i; Spanish Government PID2019-106087GB-C22; Junta de Andalucia A-FQM-472UGR20; German Research Foundation (DFG) PRISMA+ EXC 2118/1 39083149; Federal Ministry of Education & Research (BMBF) 05H18UMCA1Résumé
We propose a search for long lived axion-like particles (ALPs) in exotic top
decays. Flavour-violating ALPs appear as low energy effective theories for various new
physics scenarios such as t-channel dark sectors or Froggatt-Nielsen models. In this case
the top quark may decay to an ALP and an up- or charm-quark. For masses in the few
GeV range, the ALP is long lived across most of the viable parameter space, suggesting a
dedicated search. We propose to search for these long lived ALPs in t¯t events, using one
top quark as a trigger. We focus on ALPs decaying in the hadronic calorimeter, and show
that the ratio of energy deposits in the electromagnetic and hadronic calorimeters as well
as track vetoes can efficiently suppress Standard Model backgrounds. Our proposed search
can probe exotic top branching ratios smaller than 10−4 with a conservative strategy at the
upcoming LHC run, and potentially below the 10−7 level with more advanced methods.
Finally we also show that measurements of single top production probe these branching
ratios in the very short and very long lifetime limit at the 10−3 level.