MULTIPOLE AMPLITUDE RATIOS IN RADIATIVE DECAYS ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}{(1S)}}$ and ${{\mathit \chi}_{{{c1}}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$

$\mathit a_{2}/\mathit b_{2}$ Magnetic quadrupole transition amplitude ratio

INSPIRE   JSON  (beta) PDGID:
M055QAR
VALUE EVTS DOCUMENT ID TECN  COMMENT
$-2.27$ ${}^{+0.57}_{-0.99}$ 39k 1
ARTUSO
2009
CLEO ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
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