THE COMBINED ANALYSIS OF πN → TWO MESONS plus N REACTIONS WITHIN REGGEON EXCHANGES AND DATA FOR p(p)over-bar (AT REST) → THREE MESONS

The novel point of this analysis is a direct use of the Reggeon exchange technique for the description of the reactions pi N -> two mesons + N at large energies of the initial pion. This approach allows us to describe simultaneously distributions over M (invariant mass of two mesons) and t (momentum transfer squared to nucleons). Making use of this technique, the following resonances (as well as corresponding bare states), produced in the pi N -> pi(0)pi N-0 reaction, are studied: f(0)(980), f(0)(1300) [f(0)(1370) in PDG notation], f(0)(1200-1600), f(0)(1500), f(0)(1750), f(2)(1270), f(2)(1525), f(2)(1565), f(2)(2020), f(4)(2025). Adding data for the reactions p (p) over bar (at rest, from liquid H-2) -> pi(0)pi(0)pi(0), pi(0)pi(0)eta, pi(0)eta eta and p (p) over bar (at rest, from gaseous H-2) -> pi(0)pi(0)pi(0), pi(0)pi(0)eta, pi(0)eta eta, we have performed a simultaneous K matrix. t of two-meson spectra in all these reactions. The results of combined fits to the above-listed isoscalar f(J) states and to isovector ones, a(0)(980), a(0)(1475), a(2)(1320), are presented.