Observation of an anomalous line shape of the η'π+π−mass spectrum near the pp mass threshold in J/ψ→γη'π+π−

Using 1.09×109 J/ψ events collected by the BESIII experiment in 2012, we study the J/ψ→γη'π+π− process and observe a significant abrupt change in the slope of the η'π+π− invariant mass distribution at the proton-antiproton (p¯p) mass threshold. We use two models to characterize the η'...

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Bibliographic Details

Published in:	Physical Review Letters Vol. 117, № 4. P. 042002-1-0420020-7
Other Authors:	Ablikim, M., Ahmed, S., Chelkov, G. A., Achasov, M. N.
Format:	Article
Language:	English
Subjects:	масс-спектры протоны антипротоны статьи в журналах
Online Access:	http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000565882 Перейти в каталог НБ ТГУ