Physicists Discover New Particle Hint in Collision Experiments
Researchers using China's BESIII detector have identified a new resonance structure in electron-positron collisions, confirmed with rare 9.6-sigma statistical certainty. The discovery, published in the Journal of High Energy Physics, could refine our understanding of particle physics and inform next-generation detector designs for fundamental research facilities.
Originaltitel: Measurement of <em>e</em><sup>+</sup><em>e<sup>-</sup></em> → ωη' cross sections at √<em>s</em>=2<em>.</em>000 to 3<em>.</em>080 GeV
<p>We measured the Born cross sections for the process e<sup>+</sup>e<sup>-</sup> → ωη' at 22 center-of-mass energies from 2.000 to 3.080 GeV with the BESIII detector at the BEPCII collider. We observed a resonant structure with a statistical significance of 9.6σ. A Breit-Wigner fit determines its mass to be M<sub>R</sub> = (2153 ± 30 ± 31) MeV/c<sup>2</sup> and its width to be Γ<sub>R</sub> = (167 ± 77 ± 7) MeV, where the first uncertainties are statistical and the second are systematic.</p>