Searches for hidden sectors using K + → π + X decays

UNSPECIFIED (2025) Searches for hidden sectors using K + → π + X decays. Journal of High Energy Physics, 2025 (11). ISSN 1029-8479

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Abstract

Results from the study of the rare decays K+→π+νν¯, K+ → π+μ+μ− and K+ → π+γγ at the NA62 experiment at CERN are interpreted in terms of improved limits for BK+→π+X and coupling parameters of hidden-sector models, where X is a mediator. World-leading limits are achieved for dark photon, dark scalar and axion-like particle models.