Hide/Show Apps

Light mesons: pi, eta, and omega and exotic low mass meson production at intermediate energies in nucleon-nucleon scattering

Tatischeff, B
Yonnet, J
Rekalo, MP
Boivin, M
Comets, MP
Courtat, P
Gacougnolle, R
Le Bornec, Y
Loireleux, E
Reide, F
Willis, N
The reaction (p) over barp-->ppX was studied at three energies (T-p=1520, 1805, and 2100 MeV) and at several angles between 0 degrees and 17 degrees in the lab. The analyzing powers and differential cross sections of light meson production, X = pi, eta, and omega, were measured. The c.m. angular range varied between 0 degrees and 180 degrees where the incident energy combined with the experimental acceptance allow both forward and backward kinematical solutions. A theoretical analysis based on s-channel contributions in 2(+) and 1(-) intermediate states was performed. Narrow peaks were looked for, between eta and omega meson masses and extracted at 588, 608, 647, 681, and 700 MeV. The evidence for their existence is discussed in accordance with the corresponding number of standard deviations (SD).