Confirmation of the 1−+ meson exotics in the ηπ0 system
/ Authors
G. Adams, T. Adams, Z. Bar-Yam, J. Bishop, V. Bodyagin, D. Brown, N. Cason, M. Chassé, S. Chung, J. Cummings
and 42 more authors
A. Demianov, K. Danyo, J. Dowd, P. Eugenio, X. Fan, A. Gribushin, R. Hackenburg, M. Hayek, J. Hu, É. Ivanov, D. Joffe, W. Kern, E. King, O. Kodolova, V. Korotkikh, M. Kostin, J. Krenkel, J. Kuhn, J. LoSecco, M. Lu, L. Malinina, J. Manak, M. Nozar, C. Olchanski, A. Ostrovidov, T. Pedlar, L. Sarycheva, K. Seth, N. Shenhav, X. Shen, W. Shephard, N. Sinev, D. Stienike, J. Suh, S. Taegar, A. Tomaradze, I. Vardanyan, D. Weygand, D. White, H. Willutzki, M. Witkowski, A. Yershov
/ Abstract
Abstract The exclusive reaction π − p → η π 0 n , η → π + π − π 0 at 18 GeV / c has been studied with a partial wave analysis on a sample of 23 492 η π 0 n events from BNL experiment E852. A mass-dependent fit is consistent with a resonant hypothesis for the P + wave, thus providing evidence for a neutral exotic meson with J P C = 1 − + , a mass of 1257 ± 20 ± 25 MeV / c 2 , and a width of 354 ± 64 ± 60 MeV / c 2 . New interpretations of the meson exotics in neutral η π 0 system observed in E852 and Crystal Barrel experiments are discussed.
Journal: Physics Letters B