Inclusive charged and neutral particle multiplicity distributions in $χ_{c J}$ and $J / ψ$ decays

M. Ablikim, M. N. Achasov, P. Adlarson, Shahid Ahmed, M. Albrecht, A. Amoroso, Q. An, Anita, Y. Bai, O. Bakina, R. Baldini Ferroli, I. Balossino (+458 others)
2020 Physical Review D, Particles and fields  
Using a sample of 106 million ψð3686Þ decays, ψð3686Þ → γχ cJ ðJ ¼ 0; 1; 2Þ and ψð3686Þ → γχ cJ ; χ cJ → γJ=ψðJ ¼ 1; 2Þ events are utilized to study inclusive χ cJ → anything, χ cJ → hadrons, and J=ψ → anything distributions, including distributions of the number of charged tracks, electromagnetic calorimeter showers, and π 0 s, and to compare them with distributions obtained from the BESIII Monte Carlo simulation. Information from each Monte Carlo simulated decay event is used to construct
more » ... ices connecting the detected distributions to the input predetection "produced" distributions. Assuming these matrices also apply to data, they are used to predict the analogous produced distributions of the decay events. Using these, the charged particle multiplicities are compared with results from MARK I. Further, comparison of the distributions of the number of photons in data with those in Monte Carlo simulation indicates that G-parity conservation should be taken into consideration in the simulation.
doi:10.15120/gsi-2021-00060 fatcat:iasgcffccbac3gsdovfenlvqbm