The Distribution of a CP-asymmetric quantity in the decay channel J / Ψ → π + π ? π 0 |
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Authors: | Zhang Bin-xing Qi Na-ding Liu Jue-ping Sang Jian-ping |
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Affiliation: | (1) Department of Physics, Syracuse University, Syracuse, NY 13244, USA;(2) School of Physics, University of Melbourne, Victoria, 3010, Australia |
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Abstract: | The distribution of a CP-asymmetric quantityA in the decay channelJ/ψ→π + π − π 0 is investigated. This dimensionless quantityA is constructed from the momenta of the π-meson final states, namely A=P x π + P y π − -P x π − P y π −, whereP h,P x h andP y h are the module of the momentum of a hadron h, the x- and y-components of that momentum respectively, theJ/ψ particle is produced by e+ e− collision, and the direction of the momentum of e+ is taken to be the positive direction ofz axis. There would exists the violation under the combined transformation of charge conjugation and space reflection (CP violation) when the average ofA among a lot of events, 〈A〉, be examined to be nonzero clearly from data. In this way, 748 events are selected from the BES experimental data, and analyzed. The corresponding averageA-value is measured to be 〈A〉 = 0.010 39 ± 0.014 61 ± 0.015 2. Further, some discussion of our result, the size of the data sample being need for further attempt and a possible perspective are given. |
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