Two-photon widths of the ${\chi }_{c0,2}$ states and helicity analysis for $χ_{c2}\arγγ$}

BESIII Collaboration, M. Ablikim, M. N. Achasov +354

Based on a data sample of 106 M ${\psi }^{\prime }$ events collected with the BESIII detector, the decays $ψ^{\prime}\arγχ_{c0, 2}$,$χ_{c0, 2}\arγγ$ are studied to determine the two-photo…