Recasting KOTO KL to 3pi0 to 6gamma data yields novel limits on prompt ALPs near the pion mass via KL to 2pi0 a to 6gamma, with extensions to displaced decays for wider ALP masses.
Detailed Study of the KL -> 3pi0 Dalitz Plot
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abstract
Using a sample of 68 million KL -> 3pi0 decays collected in 1996-1999 by the KTeV (E832) experiment at Fermilab, we present a detailed study of the KL -> 3pi0 Dalitz plot density. We report the first observation of interference from KL->pi+pi-pi0 decays in which pi+pi- rescatters to 2pi0 in a final-state interaction. This rescattering effect is described by the Cabibbo-Isidori model, and it depends on the difference in pion scattering lengths between the isospin I=0 and I=2 states, a0-a2. Using the Cabibbo-Isidori model, we present the first measurement of the KL-> 3pi0 quadratic slope parameter that accounts for the rescattering effect.
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Sweeping the pion chimney for axion-like particles with KOTO
Recasting KOTO KL to 3pi0 to 6gamma data yields novel limits on prompt ALPs near the pion mass via KL to 2pi0 a to 6gamma, with extensions to displaced decays for wider ALP masses.