DOE OSTI · 3025161
Precise 𝐾* (892) → 𝐾𝜋 branching fractions
Abstract
Although discovered more than sixty years ago, direct measurement of the 𝐾*(892) → 𝐾𝜋 branching fractions is a formidable challenge that has not been attempted. Typically they are assumed to obey the isospin limit in hundreds of particle data measurements. We show that an abundance of recent amplitude analyses and other data, however, enables recovery of the ratios ℬ(𝐾 *+ → 𝐾 + 𝜋 0 )/ℬ(𝐾 *+ → 𝐾$^0_S$ 𝜋 + ) and 4ℬ(𝐾 *0 → 𝐾$^0_S$ 𝜋 0 )/ℬ(𝐾 *0 → 𝐾 + 𝜋 − ) at ∼5% precision.
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Gligorov, Vladimir V. [Sorbonne Université, Paris (France); Paris Diderot Sorbonne Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3), Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE)] (ORCID:0000000281898267), Robinson, Dean J. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)] (ORCID:0000000300571703). 2026-01-30. Precise 𝐾* (892) → 𝐾𝜋 branching fractions. https://doi.org/10.1103/s87z-1978
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