Study of sigma(750) and rho0(770) production in measurements of piN(polarized) -> pi(+)pi(-)n on a polarized target at 5.98,11.85 and 17.2 GeV/c
| dc.creator | Svec, M. | |
| dc.date | 1995-11-01 | |
| dc.date.accessioned | 2026-07-07T10:35:14Z | |
| dc.date.available | 2026-07-07T10:35:14Z | |
| dc.description | We present a new and improved model independent amplitude analysis of reactions $π^+ n_\uparrow \to π^+ π^- p$ at 5.98 and 11.85 GeV/c and $π^- p_\uparrow \to π^- π^+ n$ at 17.2 GeV/c measured with transversely polarized targets at the CERN Proton Synchrotron. A clear signal for $σ(750)$ resonance emerges in all four solutions for $S$-wave intensity $I_S$ at 5.98 and 11.85 GeV/c and in both solutions for $S$-wave amplitude $|\overline S|^2Σ$ at 17.2 GeV/c. Its $π^+π^-$ decay width is estimated to be in the range 200--300 MeV. We find significant suppression of $ρ^0$ production in the amplitudes $|U|^2Σ$, $|\overline N |^2Σ$ and, at 17.2 GeV/c, in $|L|^2Σ$. The mass dependence of amplitudes $|\overline L |^2Σ$ and $|L|^2Σ$ shows unexpected structures within the $ρ^0$ mass region which correlate the mass spectra corresponding to opposite nucleon spins. These features of $P$-wave moduli reveal the essential role of nucleon spin in pion production process and contradict the factorization hypothesis. Our results emphasize the need for a systematic study of pion production on the level of amplitudes in a new generation of dedicated experiments with spin at the recently proposed high-intensity hadron facilities. | |
| dc.description | 73 pages | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9511205 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9511205 | |
| dc.identifier | Phys.Rev.D53:2343-2361,1996 | |
| dc.identifier | doi:10.1103/PhysRevD.53.2343 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/179691 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Theory | |
| dc.title | Study of sigma(750) and rho0(770) production in measurements of piN(polarized) -> pi(+)pi(-)n on a polarized target at 5.98,11.85 and 17.2 GeV/c | |
| dc.type | text |