Physicists find no evidence of new exotic particles in high-energy collisions
Researchers at China's BESIII detector searched for six theorized subatomic particles but found none, narrowing the field of where exotic matter could exist. The null result constrains competing models of particle physics and guides where future experiments should focus resources.
Originaltitel: Search for <em>C</em>-even states decaying to D<sub>s</sub><sup>±</sup>D<sub>s</sub><sup>*∓</sup> with masses between 4.08 and 4.32 GeV/c<sup>2</sup>
<p>Six C-even states, denoted as X, with quantum numbers J(PC) = 0(-+), 1(++), or 2(++), are searched for via the e(+)e(-) -> gamma(DsDs*-/+)-D-+/- process using (1667.39 +/- 8.84) pb(-1) of e(+)e(-) collision data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energy of root s = (4681.92 +/- 0.30) MeV. No statistically significant signal is observed in the mass range from 4.08 GeV/c(2) to 4.32 GeV/c(2). The upper limits of sigma[e(+)e(-) -> gamma X] center dot B[X -> (DsDs*-/+)-D-+/-] at a 90% confidence level are determined.</p>