K. Takamatsu

A coupled channel analysis of the centrally produced K+ K- and π+ π- final states in pp interactions at 450 GeV/c

A coupled channel analysis of the centrally produced K+K- and pi+pi- final states has been performed in pp collisions at an incident beam momentum of 450 GeV/c. The pole positions and branching ratios to pipi and KK of the f0(980), f0(1370), f0(1500) and f0(1710) have been determined. A systematic study of the production properties of all the resonances observed in the pi+pi- and K+K- channels has been performed.Abstract A coupled channel analysis of the centrally produced K+K−and π+π−final states has been performed in pp collisions at an incident beam momentum of 450 GeV/c. The pole positions and branching ratios to ππ and K K of the f0(980), f0(1370), f0(1500) and f0(1710) have been determined. A systematic study of the production properties of all the resonances observed in the π+π−and K+K−channels has been performed.

Analysis of a Kπ-Scattering Phase Shift and Evidence for the κ(900) Meson

Recently we have shown an evidence for existence of \sigma-particle in the previous works; where the \pi\pi S-wave phase shift is reanalyzed, by introducing a repulsive background suggested by the chiral symmetry, and by applying a new method of Interfering Breit-Wigner Amplitudes. In this work we also show, reanalyzing the K\pi S-wave phase shift from a similar standpoint, an evidence for existence of \kappa(900), possibly to be a member of \sigma-nonet.

A study of the ηπ+π− channel produced in central pp interactions at 450 GeV/c

The reaction pp ->pf (eta eta) ps has been studied at 450 GeV/c. For the first time a partial wave analysis of the centrally produced eta eta system has been performed. Signals for the f0(1500), f0(1710) and f2(2150) are observed and the decay branching fractions of these states are determined.

A Kinematical selection of glueball candidates in central production

A study of central meson production as a function of the difference in transverse momentum (

A spin analysis of the 4π channels produced in central pp interactions at 450 GeV/c

dP_T

A partial wave analysis of the centrally produced

) of the exchanged particles shows that undisputed

K^{+}K^{-}

q \overline q

and

mesons are suppressed at small

K^{0}_{s}K^{0}_{s}

dP_T

systems in pp interactions at 450 GeV/c and new information on the spin of the

whereas the glueball candidates are enhanced.