Speaker
Diego Guadagnoli
(LAPTh Annecy)
Description
We investigate kaon three-body decays to ππa and μμa, where a is a new low-mass pseudoscalar. The ππa channel occurs at tree level, while μμa is loop-suppressed but turns out to be finite. These modes take advantage of the excellent tracking performance at LHCb. We outline an estimation strategy for the sensitivity that future searches could achieve, based on the present uncertainties in the leading irreducible backgrounds. Our results suggest that dedicated analyses could probe Peccei–Quinn scales in the range 104–106 TeV. A comparison with existing searches supports this conclusion, and we point out that reconstruction efficiency maps naturally align high efficiencies with regions of larger yields in Dalitz plots.
Author
Diego Guadagnoli
(LAPTh Annecy)