Observation of exotic meson production in the reaction $ π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c
| dc.creator | Ivanov, E. I. | |
| dc.date | 2001-01-31 | |
| dc.date.accessioned | 2026-07-07T12:01:35Z | |
| dc.date.available | 2026-07-07T12:01:35Z | |
| dc.description | An amplitude analysis of an exclusive sample of 5765 events from the reaction $π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c is described. The $η^{\prime} π^-$ 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 $η^{\prime}π^-$. 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 $π_1(1600)$, 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. | |
| dc.description | 5 pages with 4 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0101058 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0101058 | |
| dc.identifier | Phys.Rev.Lett.86:3977-3980,2001 | |
| dc.identifier | doi:10.1103/PhysRevLett.86.3977 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/207143 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Observation of exotic meson production in the reaction $ π^{-} p \to η^{\prime} π^- p$ at 18 GeV/c | |
| dc.type | text |