Search for a narrow resonance in the ppπ- system
Vorob'ev L. S., Grishuk Yu. G., Efremenko Yu. V., Kosov M. V., Kuleshov S. V., Leksin G. A., Pivnyuk N. A., Smirnitskii A. V., Fedorov V. B., Shvartsman B. B., Shuvalov S. M., Shchepkin M. G.
Preliminary results of the analysis of the ρρπ~ system produced in the reaction ρρ-*ρρπ~π+ reveal a resonance with a mass Af~2.06 GeV and a width < 15 MeV. The mass spectrum of the system pptr~, which can have any quantum numbers, including those forbidden in the np system, has been investigated for the first time. The observed resonance in the ρρπ~ mass spectrum is in agreement with the quark models, and it confirms the recently proposed explanation of the peculiar features in the low-energy pionic double charge exchange on nuclei.