Physicists set new limits on exotic particle decay, constraining quantum models
Researchers using China's BESIII detector found no evidence for a rare subatomic decay predicted by some quantum theories, setting the tightest experimental constraint to date. The null result narrows the theoretical landscape for physics beyond the standard model and demonstrates how negative findings guide the search for new particles and forces.
Originaltitel: Search for the rare decay 𝐽/𝜓→𝛾𝐷<sup>0</sup>+c.c. at BESIII
<p>Using (10087±44)×10<sup>6</sup>𝐽/𝜓 events collected with the BESIII detector, we search for the rare decay 𝐽/𝜓 →𝛾𝐷<sup>0</sup> +c.c. for the first time. No significant signal is observed and the upper limit on the branching fraction is determined to be ℬ(𝐽/𝜓→𝛾𝐷<sup>0</sup>+c.c.)<9.1×10<sup>−8</sup> at 90% confidence level.</p>