Recent results from the COSY-11 experiment on near-threshold meson production in pp and pd collisions

2002 ◽  
Author(s):  
J. Smyrski ◽  
H. H. Adam ◽  
A. Budzanowski ◽  
D. Grzonka ◽  
L. Jarczyk ◽  
...  
Keyword(s):  
Meson Production ◽  
Near Threshold

Meson Production Near Threshold

The Nucleus ◽  
2000 ◽  
pp. 221-235
Author(s):  
Tord Johansson ◽  
H. Calén ◽  
J. Dyring ◽  
K. Fransson ◽  
L. Gustafsson ◽  
...  
Keyword(s):  
Meson Production ◽  
Near Threshold

scholarly journals Near-threshold η meson production in proton–proton collisions

2000 ◽  
Vol 474 (1-2) ◽  
pp. 182-187 ◽  
Author(s):  
J. Smyrski ◽  
P. Wüstner ◽  
J.T. Balewski ◽  
A. Budzanowski ◽  
H. Dombrowski ◽  
...  
Keyword(s):  
Meson Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions ◽  
Near Threshold

STUDY OF MESON PRODUCTION IN NUCLEI NEAR THRESHOLD

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1271-1281 ◽  
Author(s):  
B. K. JAIN ◽  
N. J. UPADHYAY ◽  
K. P. KHEMCHANDANI ◽  
N. G. KELKAR
Keyword(s):  
Cross Sections ◽  
Final State Interaction ◽  
Scattering Length ◽  
Meson Production ◽  
Final State ◽  
Total Cross Sections ◽  
Low Energies ◽  
Final State Interactions ◽  
T Matrix ◽  
Near Threshold

We present a study of the η production at low energies in pd collision with 3He and pd nuclear systems in the final state. The η production mechanism is described by a two-step model and the final state interactions are included fully. The η - d and η - 3He final state interactions are incorporated through the solution of the Lippmann Schwinger equation for a half off-shell η - AT-matrix. For η - d this t -matrix is written in a factorized form, with an off-shell form factor multiplying an on-shell part having the scattering length representation. The p - d final state interaction is included by multiplying the production matrix element by the inverse of the Jost function which includes the strong as well as the Coulomb interaction. The total cross sections are found to be strongly affected by both the η - d and the p - d final state interactions. The η - 3HeT-matrix is obtained in the Finite Rank Approximation (FRA) by solving few-body equations. The calculated total cross sections are in good accord with the available experimental data. Through the time delay method of Wigner, we also explore the possibility of the existence of quasi-bound η-3 He mesic states in this η - 3He T -matrix. We find that the T -matrix which reproduces the low energy pd → 3He η data implies a quasi-bound eta state near threshold. This is in accord with experimental indications.

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