pdgLive Home   >   ${\mathit {\mathit c}}{\mathit {\overline{\mathit c}}}$ MESONS (including possibly non-${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{c2}}{(1P)}}$   >   $\mathit b_{3}$ = $\mathit E3/\sqrt {\mathit E1{}^{2}+\mathit M2{}^{2}+\mathit E3{}^{2} }$ Electric octupole fractional transition amplitude

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   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 2017 N BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ $1.5$ $\pm0.8$ $\pm1.8$ 13.8k 2 ABLIKIM 2011 I 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 2004 I 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:

ABLIKIM 2017N PR D95 072004 Measurement of Higher-Order Multipole Amplitudes in ${{\mathit \psi}{(3686)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{c1,2}}}$ with ${{\mathit \chi}_{{c1,2}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}}$ and Search for the Transition ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}}$ ABLIKIM 2011I PR D84 092006 Higher-Order Multipole Amplitude Measurement in ${{\mathit \psi}^{\,'}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{c2}}}$ ARTUSO 2009 PR D80 112003 Higher-Order Multipole Amplitudes in Charmonium Radiative Transitions ABLIKIM 2004I PR D70 092004 Measurement of the ${{\mathit \chi}_{{c2}}}$ Polarization in ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{c2}}}$

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