${\boldsymbol {\boldsymbol c}}$ ${\boldsymbol {\overline{\boldsymbol c}}}$ MESONS
(including possibly non- ${\boldsymbol {\boldsymbol q}}$ ${\boldsymbol {\overline{\boldsymbol q}}}$ states)
INSPIRE search

${{\boldsymbol \chi}_{{c1}}{(1P)}}$ $I^G(J^{PC})$ = $0^+(1^{+ +})$

See the Review on ``${{\mathit \psi}{(2S)}}$ and ${{\mathit \chi}_{{c}}}$ branching ratios'' before the ${{\mathit \chi}_{{c0}}{(1P)}}$ Listings.
${{\mathit \chi}_{{c1}}{(1P)}}$ MASS   $3510.67 \pm0.05$ MeV (S = 1.2)
${{\mathit \chi}_{{c1}}{(1P)}}$ WIDTH   $0.84 \pm0.04$ MeV 
MULTIPOLE AMPLITUDES IN ${{\boldsymbol \chi}_{{c1}}{(1P)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol J / \psi}{(1S)}}$
$\mathit a_{2}$ = $\mathit M2/\sqrt {\mathit E1{}^{2}+\mathit M2{}^{2} }$ Magnetic quadrupole fractional transition amplitude   $-0.067 \pm0.009$  (S = 2.6)
MULTIPOLE AMPLITUDES IN ${{\boldsymbol \psi}{(2S)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \chi}_{{c1}}{(1S)}}$ RADIATIVE DECAY
$\mathit b_{2}$ = $\mathit M2/\sqrt {\mathit E1{}^{2}+\mathit M2{}^{2} }$ Magnetic quadrupole fractional transition amplitude   $0.025 \pm0.004$  
MULTIPOLE AMPLITUDE RATIOS IN RADIATIVE DECAYS ${{\boldsymbol \psi}{(2S)}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol \chi}_{{c1}}{(1S)}}$ and ${{\boldsymbol \chi}_{{c1}}}$ $\rightarrow$ ${{\boldsymbol \gamma}}{{\boldsymbol J / \psi}{(1S)}}$
$\mathit a_{2}/\mathit b_{2}$ Magnetic quadrupole transition amplitude ratio   $-2.3 {}^{+0.6}_{-1.0}$  
    constrained fit information