Physicists find no evidence of exotic particle, narrowing search space
Researchers at China's BESIII detector failed to detect a theorized exotic particle called psi(0)(4360), setting new limits on where it might exist. The null result refines the hunt for rare subatomic states and helps physicists understand the boundaries of matter itself—work with implications for future particle accelerator designs and fundamental physics research.
Originaltitel: Search for 𝜓0(4360) →𝜂𝜓(2𝑆) through the process 𝑒+𝑒− →𝜂𝜂𝜓(2𝑆)
<p>Using data samples corresponding to an integrated luminosity of 0.9 fb(-1) collected with the BESIII detector operating at the BEPCII storage ring at the center-of-mass energies of 4.84, 4.92, and 4.95 GeV, we search for the exotic charmoniumlike state with quantum numbers J(PC) = 0(--), psi(0)(4360), in the process e(+)e(-) -> eta psi(0)(4360) with psi(0)(4360) -> eta psi(2S). No significant signal of the psi(0)(4360) resonance state is observed. Upper limits on sigma(e(+)e(-) -> eta psi(0)(4360)) . B(psi(0) (4360) -> eta psi(2S)) and sigma(e(+)e(-) -> eta eta psi(2S))ORNTHORN at the 90% confidence level are determined for each energy point.</p>