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Observation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mn>1</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>1</mml:mn></mml:mmultiscripts></mml:math>state of charmonium
The spin-singlet $P$-wave state of charmonium, ${h}_{c}{(}^{1}{P}_{1})$, has been observed in the decay $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{h}_{c}$ followed by ${h}_{c}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}$. Inclusive and exclusive analyses of the $M({h}_{c})$ spectrum have been performed. Two complementary inclusive analyses select either a range of energies for the photon emitted in ${h}_{c}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}$ or a range of values of …