${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states) 		INSPIRE   JSON PDGID:
M055

${{\mathit \chi}_{{{c1}}}{(1P)}}$

$I^G(J^{PC})$ = $0^+(1^{+ +})$ 
See the Review on ``Branching Ratios of ${{\mathit \psi}{(2S)}}$, ${{\mathit \chi}}_{c0,1,2}$ and ${{\mathit \eta}_{{{c}}}{(1S)}}$'' 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 (S = 1.1)
 
MULTIPOLE AMPLITUDES IN ${{\mathit \chi}_{{{c1}}}{(1P)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$
$\mathit a_{2}$ = $\mathit M2/\sqrt {\mathit E1{}^{2}+\mathit M2{}^{2} }$ Magnetic quadrupole fractional transition amplitude   $-0.067 \pm0.009$  (S = 2.6)
 
MULTIPOLE AMPLITUDES IN ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}{(1S)}}$ 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 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}{(1S)}}$ and ${{\mathit \chi}_{{{c1}}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$
$\mathit a_{2}/\mathit b_{2}$ Magnetic quadrupole transition amplitude ratio   $-2.3 {}^{+0.6}_{-1.0}$  
 
$\Gamma_{1}$ hadrons    
 
$\Gamma_{2}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$   $(1.4^{+1.5}_{-1.0})\times 10^{-7}$ 1755
 
FOOTNOTES
Constrained Fit information