Usin. data taken.at 29 cen.er-of-mass en.rgies between.4.16 an. 4.70 GeV with the BESⅢdetector at the Beijin. Electron.Positron.Collider correspon.in. to a total in.egrated lumin.sity of approximately 18.8 fb^(-1),th...
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Usin. data taken.at 29 cen.er-of-mass en.rgies between.4.16 an. 4.70 GeV with the BESⅢdetector at the Beijin. Electron.Positron.Collider correspon.in. to a total in.egrated lumin.sity of approximately 18.8 fb^(-1),the process e^(+)e^(-)→pppñπ+*** observed for the first time with a statistical sign.fican.e of 11.5σ.The average Born.cross section. in.the en.rgy ran.es of(4.160,4.380)GeV,(4.400,4.600)GeV an.(4.610,4.700)GeV are measured to be(21.5±5.7±1.2)fb,(46.3±10.6±2.5)fb an.(59.0±9.4±3.2)fb,respectively,where the first un.ertain.ies are statistical an. the secon. are *** lin. shapes of the pñ an. ppπ^(-)in.arian. mass spectra are con.isten. with phase space distribution.,in.icatin. that n. hexaquark or di-baryon.state is observed.
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