Charmonium Edit Page

First observation of the decay \(\chi_{cJ}\to\Sigma^{+}\bar{p}K_S^0 + c.c. (J=0,1,2)\)

Using E1 radiative transitions \(\psi(3686)\to\gamma\) from a sample of \((448.1 \pm 2.9) \times 10^6 \psi(3686)\) events collected with the BESIII detector, the decays \(\chi_{cJ}\to \Sigma^+ \bar{p}K^0_S + c.c. (J= 0, 1, 2)\) are studied. The decay branching fractions are measured to be \(\cal{B} (\chi_{c0}\to\Sigma^+\bar{p} K^0_S +c.c.) = 3.52 \pm 0.19 \pm 0.21)\times 10^{−4}\), \(\cal{B} (\chi_{c1}\to\Sigma^+\bar{p} K^0_S +c.c.) = 1.53 \pm 0.10 \pm 0.08)\times 10^{−4}\), and \(\cal{B} (\chi_{c2}\to\Sigma^+\bar{p} K^0_S +c.c.) = 8.25 \pm 0.83 \pm 0.49)\times 10^{−5}\), where the first and second uncertainties are the statistical and systematic ones, respectively. No evident intermediate resonances are observed in the studied processes.

Further reading: M. Ablikim et al. (BESIII Collaboration), First observation of the decay \(\chi_{cJ}\to\Sigma^{+}\bar{p}K_S^0 + c.c. (J=0,1,2)\), Phys.Rev. D100, 092006 (2019)