0000000001192938
AUTHOR
Kanchan P. Khemchandani
Solution to Faddeev equations with two-body experimental amplitudes as input and application to J^P=1/2^+, S=0 baryon resonances
We solve the Faddeev equations for the two meson-one baryon system pi pi N and coupled channels using the experimental two-body t matrices for the pi N interaction as input and unitary chiral dynamics to describe the interaction between the rest of coupled channels. In addition to the N-*(1710) obtained before with the pi pi N channel, we obtain, for J(pi)=1/2(+) and total isospin of the three-body system I=1/2, a resonance peak whose mass is around 2080 MeV and width 54 MeV, while for I=3/2 we find a peak around 2126 with 42 MeV of width. These two resonances can be identified with the N-*(2100) and the Delta(1910), respectively. We obtain another peak in the isospin 1/2 configuration, aro…
The role of f(0)(1710) in the phi omega threshold peak of J/Psi -> gamma phi omega
We study the process J/Psi -> gamma phi omega, measured by the BES experiment, where a neat peak close to the phi omega threshold is observed and is associated to a scalar meson resonance around 1800 MeV. We make the observation that a scalar resonance coupling to phi omega unavoidably couples strongly to K (K) over bar, but no trace of a peak is seen in the K (K) over bar spectrum of the J/Psi -> gamma K (K) over bar at this energy. This serves us to rule out the interpretation of the observed peak as a signal of a new resonance. After this is done, a thorough study is performed on the production of a pair of vector mesons and how its interaction leads necessarily to a peak in the J/Psi ->…
Study of thepd→pdηreaction
A study of the pd{yields}pd{eta} reaction in the energy range where the recent data from Uppsala are available is done in the two-step model of {eta} production including the final state interaction. The {eta}-d final state interaction is incorporated through the solution of the Lippmann Schwinger equation using an elastic scattering matrix element, T{sub {eta}}{sub d{yields}}{sub {eta}}{sub d}, which is required to be half off-shell. It is written in a factorized form, with an off-shell form factor multiplying an on-shell part given by an effective range expansion up to the fourth power in momentum. The parameters of this expansion have been taken from an existing recent relativistic Fadde…