Observation of exotic meson production in the reaction $ π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c

Details Observation of exotic meson production in the reaction $ π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c Observation of exotic meson production in the reaction $ π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c

2001-01-31

arxiv.org/abs/hep-ex/0101058v1

Phys.Rev.Lett.86:3977-3980,2001

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages with 4 figures

Scientific paper

10.1103/PhysRevLett.86.3977

An amplitude analysis of an exclusive sample of 5765 events from the reaction $\pi^{-} p \to \eta^{\prime} \pi^- p$ at 18 GeV/c is described. The $\eta^{\prime} \pi^-$ 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 $a_2(1320)$ meson as well as the $a_4(2040)$ meson, observed for the first time decaying to $\eta^{\prime}\pi^-$. The dominant, exotic (non-$q\bar{q}) $ $1^{-+}$ partial wave is shown to be resonant with a mass of $1.597 \pm 0.010^{+0.045}_{-0.010}$ GeV/c^2 and a width of $0.340 \pm 0.040 \pm 0.050$ GeV/c^2 . This exotic state, the $\pi_1(1600)$, is produced with a $t$ dependence which is different from that of the $a_2(1320)$ meson, indicating differences between the production mechanisms for the two states.

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