Observation of exotic meson production in the reaction pi- p --> eta'pi- p at 18 GeV/c

Observation of exotic meson production in the reaction pi- p --> eta'pi- p at 18 GeV/c

An amplitude analysis of an exclusive sample of 5765 events from the reaction pi- p-->eta'pi- p at 18 GeV/c is described. The eta'pi- production is dominated by natural parity exchange and by three partial waves: those with J(PC) = 1(-+), 2(++), and 4(++). A mass-dependent analysis of t...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Physical review letters 2001-04, Vol.86 (18), p.3977-3980
Hauptverfasser: Ivanov, E I, Stienike, D L, Ryabchikov, D I, Adams, G S, Adams, T, Bar-Yam, Z, Bishop, J M, Bodyagin, V A, Brown, D S, Cason, N M, Chung, S U, Cummings, J P, Danyo, K, Denisov, S P, Dorofeev, V A, Dowd, J P, Eugenio, P, Fan, X L, Hackenburg, R W, Hayek, M, Joffe, D, Kachaev, I A, Kern, W, King, E, Kodolova, O L, Korotkikh, V L, Kostin, M A, Kuhn, J, Lipaev, V V, LoSecco, J M, Manak, J J, Napolitano, J, Nozar, M, Olchanski, C, Ostrovidov, A I, Pedlar, T K, Popov, A V, Sarycheva, L I, Seth, K K, Shen, X, Shenhav, N, Shephard, W D, Sinev, N B, Smith, J A, Taegar, S A, Tomaradze, A, Vardanyan, I N, Weygand, D P, White, D B, Willutzki, H J, Witkowski, M, Yershov, A A
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:An amplitude analysis of an exclusive sample of 5765 events from the reaction pi- p-->eta'pi- p at 18 GeV/c is described. The eta'pi- production is dominated by natural parity exchange and by three partial waves: those with J(PC) = 1(-+), 2(++), and 4(++). A mass-dependent analysis of the partial-wave amplitudes indicates the production of the a2(1320) meson as well as the a4(2040) meson, observed for the first time decaying to eta'pi-. The dominant, exotic (non- qq) 1(-+) partial wave is shown to be resonant with a mass of 1.597+/-0.010(+0.045)(-0.010) GeV/c2 and a width of 0.340+/-0.040+/-0.050 GeV/c2. This exotic state, the pi1(1600), is produced with a t dependence which is different from that of the a2(1320) meson, indicating differences between the production mechanisms for the two states.
ISSN:0031-9007