Physicists find no evidence of rare particle interaction in new collider search
Researchers at China's BEPCII Collider searched for a never-before-observed particle interaction across billions of collision events but came up empty. The null result narrows the search space for exotic particles and guides where future experiments should focus resources to understand fundamental physics beyond current theories.
Originaltitel: Search for <em>e</em><sup>+</sup><em>e</em><sup>-</sup> → <em>η'ψ</em>(2<em>S</em>) at center-of-mass energies from 4.66 to 4.95 GeV
<p>Using data samples with an integrated luminosity of 4.67 fb<sup>-1</sup> collected by the BESIII detector operating at the BEPCII Collider, we search for the process e<sup>+</sup>e<sup>-</sup> → <em>η'ψ</em>(2S) at center-of-mass energies from 4.66 to 4.95 GeV. No significant signal is observed, and upper limits for the Born cross sections σ<sup>B</sup>(e<sup>+</sup>e<sup>-</sup> → <em>η'ψ</em>(2S)) at the 90% confidence level are determined.</p>