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PRODUCED IN ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ANNIHILATION AND PARTICLE DECAYS

INSPIRE   PDGID:

M013W3

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 86 \pm4}$ OUR AVERAGE  Error includes scale factor of 2.4.  See the ideogram below. $64.0$ $\pm4.3$ ${}^{+2.0}_{-6.1}$ 126K ABLIKIM 2023 M BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ $84$ $\pm6$ ${}^{+10}_{-5}$ AAIJ 2013 AN LHCB ${{\overline{\mathit B}}_{{{s}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $75$ ${}^{+12}_{-10}$ ${}^{+16}_{-8}$ 5.5k 1 ABLIKIM 2013 N BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \eta}}$ $82.9$ ${}^{+2.1}_{-2.2}$ ${}^{+3.3}_{-2.0}$ UEHARA 2013 BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $77$ $\pm15$ ABLIKIM 2005 BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $82$ $\pm2$ $\pm3$ ABE 2004 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $75$ $\pm4$ ${}^{+15}_{-5}$ BAI 2003 G BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}}{{\overline{\mathit K}}}$ $100$ $\pm15$ 331 2 ACCIARRI 2001 H L3 91, $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $60$ $\pm20$ $\pm19$ ABREU 1996 C DLPH ${{\mathit Z}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$ + X $60$ $\pm23$ ${}^{+13}_{-20}$ BAI 1996 C BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $103$ $\pm30$ AUGUSTIN 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $100$ $\pm3$ 3 FALVARD 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $85$ $\pm35$ BALTRUSAITIS 1987 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ • • We do not use the following data for averages, fits, limits, etc. • • $78$ $\pm6$ 4 KLEMPT 2022 RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $84$ $\pm15$ 5 RODAS 2022 RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ (${{\mathit \pi}}{{\mathit \pi}}$ , ${{\mathit K}}{{\overline{\mathit K}}}$) $37$ $\pm12$ 29 6 LEES 2014 H BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \gamma}}$ $104$ $\pm10$ 870 7 SCHEGELSKY 2006 A RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $62$ $\pm10$ 8 FALVARD 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ 1  From partial wave analysis including all possible combinations of 0${}^{++}$, 2${}^{++}$, and 4${}^{++}$ resonances. 2  Supersedes ACCIARRI 1995J. 3  From an analysis including interference with ${{\mathit f}_{{{0}}}{(1710)}}$. 4  Fit of the tensor partial waves from BES3 in the multipole basis. 5  T-matrix pole from coupled channel K-matrix fit to data on ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ (ABLIKIM 2015AE) and ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ (ABLIKIM 2018AA). 6  From a fit to a Breit-Wigner line shape plus a second-order polynomial function. Systematic errors not evaluated. 7  From analysis of L3 data at 91 and $183 - 209$ GeV. 8  From an analysis ignoring interference with ${{\mathit f}_{{{0}}}{(1710)}}$.

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ width, ${{\mathit e}^{+}}{{\mathit e}^{-}}$ annihilation and particle decays (MeV)

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