Amplitude Analysis of pi pi Scattering from New Data on the Reaction pi exp - p Implies pi exp + pi exp - N

摘要

A partial wave analysis of pi pi scattering in the mass range 1.0 to 2.08 GeV/c exp 2 has been carried out. Solutions similar to those obtained in previous analyses below 1.8 GeV/c exp 2 were found but, in addition, a new solution which does not suffer from violations of unitarity and is compatible with data from other channels was obtained. This solution, when continued to 2.08 GeV/c exp 2 , shows a g meson with mass and width of 1.734 +- 0.010 GeV/c exp 2 and 0.322 +- 0.035 GeV/c exp 2 respectively, and an h meson with mass 1.935 +- 0.013 GeV/c exp 2 and width 0.263 +- 0.057 GeV/c exp 2 . The L = 2 partial wave contains the f meson and an additional resonance with parameters m = 1.502 +- 0.025 GeV/c exp 2 , GAMMA = 0.165 +- 0.042 GeV/c exp 2 and x = 0.19 +- 0.03. If this state is associated with the f'(1514) the pi pi branching fraction is considerably higher than previous determinations. An SU(3) fit to the 2 exp + nonet yields a mixing angle of 38.4 exp 0 +- 1.3 exp 0 . (Atomindex citation 10:457459)