More Like this

1. Observation of $e^{+}{e}^{-}\to \gamma {\chi }_{c1}$ and search for $e^{+}{e}^{-}\to \gamma {\chi }_{c0}$ , $\gamma {\chi }_{c2}$ , and $\gamma {\eta }_c$ at $\sqrt{s}$ near 10.6 GeV at Belle

   https://doi.org/10.1103/PhysRevD.98.092015  

   Jia, S. ; Wang, X. L. ; Shen, C. P. ; Yuan, C. Z. ; Adachi, I. ; Aihara, H. ; Al Said, S. ; Asner, D. M. ; Atmacan, H. ; Aulchenko, V. ; et al ( November 2018 , Physical Review D)
2. Measurement of higher-order multipole amplitudes in $\psi (3686)\to \gamma {\chi }_{c1,2}$ with ${\chi }_{c1,2}\to \gamma J/\psi$ and search for the transition ${\eta }_c(2S)\to \gamma J/\psi$

   https://doi.org/10.1103/PhysRevD.95.072004  

   Ablikim, M. ; Achasov, M. N. ; Ai, X. C. ; Albayrak, O. ; Albrecht, M. ; Ambrose, D. J. ; Amoroso, A. ; An, F. F. ; An, Q. ; Bai, J. Z. ; et al ( April 2017 , Physical Review D)
3. Observation of the $\psi (1\hspace{0.17em}{}^3{D}_2)$ State in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma {\chi }_{c1}$ at BESIII

   https://doi.org/10.1103/PhysRevLett.115.011803  

   Ablikim, M. ; Achasov, M. N. ; Ai, X. C. ; Albayrak, O. ; Albrecht, M. ; Ambrose, D. J. ; Amoroso, A. ; An, F. F. ; An, Q. ; Bai, J. Z. ; et al ( July 2015 , Physical Review Letters)
4. Search for the $Z_1(4050{)}^{+}$ and $Z_2(4250{)}^{+}$ states in ${\overline{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ and $B^{+}\to {\chi }_{c1}{K}_S^0{\pi }^{+}$

   https://doi.org/10.1103/PhysRevD.85.052003  

   Lees, J. P. ; Poireau, V. ; Tisserand, V. ; Garra Tico, J. ; Grauges, E. ; Martinelli, M. ; Milanes, D. A. ; Palano, A. ; Pappagallo, M. ; Eigen, G. ; et al ( March 2012 , Physical Review D)
5. Amplitude analyses of the decays ${\chi }_{c1}\to \eta {\pi }^{+}{\pi }^{-}$ and ${\chi }_{c1}\to {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$

   https://doi.org/10.1103/PhysRevD.84.112009  

   Adams, G. S. ; Napolitano, J. ; Ecklund, K. M. ; Insler, J. ; Muramatsu, H. ; Park, C. S. ; Pearson, L. J. ; Thorndike, E. H. ; Ricciardi, S. ; Thomas, C. ; et al ( December 2011 , Physical Review D)