MULTIPOLE AMPLITUDE RATIOS IN RADIATIVE DECAYS ${{\boldsymbol \psi}{(2S)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \chi}_{{c2}}{(1P)}}$ and ${{\boldsymbol \chi}_{{c2}}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol J / \psi}{(1S)}}$

$\boldsymbol b_{2}/\boldsymbol a_{2}$ Magnetic quadrupole transition amplitude ratio INSPIRE search

VALUE ($ 10^{-2} $) EVTS DOCUMENT ID TECN  COMMENT
$-11$ ${}^{+14}_{-15}$ 19.8k 1
ARTUSO
2009
CLEO ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
1  Statistical and systematic errors combined. From a fit with floating $\mathit M2$ amplitudes $\mathit a_{2}$ and $\mathit b_{2}$, and fixed $\mathit E3$ amplitudes $\mathit a_{3}=\mathit b_{3}$=0. Not independent of values for $\mathit a_{2}({{\mathit \chi}_{{c2}}{(1P)}}$) and $\mathit b_{2}({{\mathit \chi}_{{c2}}{(1P)}}$) from ARTUSO 2009 .
  References:
ARTUSO 2009
PR D80 112003 Higher-Order Multipole Amplitudes in Charmonium Radiative Transitions