| Article | |
| Title | The $A_{1}$ meson produced at 63 and 94 GeV/c in the reaction $\pi^{-} p\to\pi^{-}\pi^{-}\pi^{+}p$ |
| Author(s) | Thompson, G (Oxford U.) |
| Collaboration | ACCMOR Collaboration |
| Publication | 1979 |
| Imprint | 1979 |
| In: | International Conference on High-energy Physics, pp.623-627 |
| Subject category | Particle Physics - Experiment ; Particle Physics - Phenomenology |
| Accelerator/Facility, Experiment | CERN SPS ; WA3 |
| Free keywords | 10-100GeV ; A(1) ; pi- pi- pi+ ; pi-p |
| Abstract | The results are presented of partial wave analyses of almost 600000 events from the reaction pi /sup -/p to pi /sup -/ pi /sup -/ pi /sup +/p at 63 and 94 GeV/c and with a higher momentum transfer trigger. The shape of the 1/sup +/S ( rho pi ) mass spectrum changes substantially as a function of t, and is not compatible with predictions of the Deck model. In addition, the phase of this partial wave rises by approximately 90 degrees over a mass range of 400 GeV/c /sup 2/ relative to 0/sup -/P, 2/sup -/P and the 2/sup +/D production phases. These features provide compelling evidence for a resonant A /sub 1/ of mass approximately 1280 MeV/c/sup 2/ and width approximately 300 MeV/c/sup 2/ and indeed a rescattering model with such a state fits the data well. (7 refs). |
Corresponding record in: Inspire
Journalen skapades 2005-08-19, och modifierades senast 2018-04-11
