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

Physical Review Letters
E I IvanovE852 Collaboration

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.

References

Jun 1, 1985·Physical Review. D·N Isgur, J Paton
Dec 1, 1996·Physical Review. D·P LacockP Rowland

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Citations

Jun 24, 2016·Nature·Matthew R ShepherdRyan E Mitchell
Feb 9, 2005·Physical Review Letters·M LuUNKNOWN E852 Collaboration
Sep 28, 2010·Physical Review Letters·M G AlekseevUNKNOWN COMPASS Collaboration
Feb 16, 2019·Physical Review Letters·A RodasUNKNOWN Joint Physics Analysis Center
Apr 28, 2009·Physical Review Letters·M NozarUNKNOWN CLAS Collaboration
Oct 4, 2003·Physical Review Letters·Adam P SzczepaniakScott Teige

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