MULTIPOLE AMPLITUDES IN ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c2}}}{(1P)}}$ RADIATIVE DECAY

$\mathit b_{3}$ = $\mathit E3/\sqrt {\mathit E1{}^{2}+\mathit M2{}^{2}+\mathit E3{}^{2} }$ Electric octupole fractional transition amplitude

INSPIRE   JSON  (beta) PDGID:
M057QB3
VALUE ($ 10^{-2} $) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ -1.0 \pm0.6}$ OUR AVERAGE
$-1.4$ $\pm0.7$ $\pm0.4$ 89k 1
ABLIKIM
2017N
 BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
$1.5$ $\pm0.8$ $\pm1.8$ 13.8k 2
ABLIKIM
2011I
 BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$, ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
$-0.8$ $\pm1.2$ $\pm0.2$ 19.8k
ARTUSO
2009
CLEO ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
$-2.7$ ${}^{+4.3}_{-2.9}$ 721 2
ABLIKIM
2004I
 BES2 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$, ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
1  Correlated with ${{\mathit a}_{{{2}}}}$, ${{\mathit a}_{{{3}}}}$, and ${{\mathit b}_{{{2}}}}$ with correlation coefficients $\rho _{{{\mathit a}_{{{2}}}} {{\mathit b}_{{{3}}}}}$ = $-0.095$, $\rho _{{{\mathit a}_{{{3}}}} {{\mathit b}_{{{3}}}}}$ = $-0.024$, and $\rho _{{{\mathit b}_{{{2}}}} {{\mathit b}_{{{3}}}}}$ = $0.384$.
2  From a fit with floating $\mathit M2$ and $\mathit E3$ amplitudes $\mathit b_{2}$ and $\mathit b_{3}$.
References