Publication: Search for a feebly interacting particle X in the decay K + → π + X
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2021
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© 2021, The Author(s).A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ → π+νν¯ analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0–110 MeV/c2 and 154–260 MeV/c2, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K+ → π+X), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.
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Search for a feebly interacting particle X in the decay K + → π + X / Cortina, Gil, E. [et al.] // Journal of High Energy Physics. - 2021. - 2021. - № 3. - 10.1007/JHEP03(2021)058