1
Statistical and systematic errors combined. Not independent of $\mathit a_{2}({{\mathit \chi}_{{c1}}}$) and $\mathit b_{2}({{\mathit \chi}_{{c1}}}$) values from ARTUSO 2009 .
References:
ARTUSO
2009
PR D80 112003
Higher-Order Multipole Amplitudes in Charmonium Radiative Transitions