Observation of exotic meson production in the reaction pi- p --> eta'pi- p at 18 GeV/c |
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| Authors: | 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 E Collaboration |
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| Affiliation: | University of Notre Dame, Notre Dame, Indiana 46556, USA. |
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| Abstract: | ![]()
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. |
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