Physicists map exotic particle decays, advancing understanding of matter
Researchers have observed rare decay patterns of subatomic particles for the first time, providing new experimental data on how matter behaves at extreme energies. The findings refine our models of fundamental physics and could eventually inform next-generation particle detector design and industrial applications in materials science.
Originaltitel: Observation of χc0 → Σ<sup>+</sup>(Σ) over-bar -η and evidence for χ<sub>c1,2</sub> → Σ<sup>+</sup>(Σ)over-bar-η
<p>Using (27.12 +/- 0.14) x 10(8) psi(3686) events collected with the BESIII detector chi(c0) -> Sigma(+)<(Sigma)ver bar>(-)eta is observed for the first time with a signal significance of 7.0 sigma, and evidence for chi(c1) -> Sigma(+)<(Sigma)ver bar>(-)eta and chi(c2) -> Sigma(+)<(Sigma)ver bar>(-)eta is found with signal significances of 4.3 sigma and 4.6 sigma, respectively. The branching fractions are determined to be B(chi(c0) -> Sigma(+)<(Sigma)ver bar>(-)eta) = (1.26 +/- 0.20 +/- 0.13) x 10(-4), B(chi(c1) -> Sigma(+)<(Sigma)ver bar>(-)eta) = 5.10 +/- 1.21 +/- 0.67 x 10(-5), and B(chi(c2) -> Sigma(+)<(Sigma)ver bar>(-)eta) = (5.46 +/- 1.18 +/- 0.50) x 10(-5), where the first uncertainties are statistical, and the second ones are systematic.</p>