在18 GeV/c下对反应π⁻ p → η'π⁻ p中奇异介子产生的观测。
Observation of exotic meson production in the reaction pi- p --> eta'pi- p at 18 GeV/c.
作者信息
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
机构信息
University of Notre Dame, Notre Dame, Indiana 46556, USA.
出版信息
Phys Rev Lett. 2001 Apr 30;86(18):3977-80. doi: 10.1103/PhysRevLett.86.3977.
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.
描述了对反应π⁻p→η'π⁻p在18 GeV/c下5765个事例的一个专属样本进行的幅度分析。η'π⁻产生主要由自然宇称交换以及三个分波主导：那些具有J(PC)=1⁻⁺、2⁺⁺和4⁺⁺的分波。对分波幅度的质量依赖分析表明了a₂(1320)介子以及a₄(2040)介子的产生，首次观测到a₄(2040)介子衰变为η'π⁻。占主导地位的奇特（非qq）1⁻⁺分波被证明在质量为1.597±0.010(+0.045)(-0.010) GeV/c²且宽度为0.340±0.040±0.050 GeV/c²处发生共振。这个奇特态，即π₁(1600)，其产生的t依赖性与a₂(1320)介子不同，表明这两个态的产生机制存在差异。
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