A quark model of {bar {Lambda}}{Lambda} production in {bar p}p interactions
- Seattle Univ., WA (United States)
- Univ. of Washington, Seattle, WA (United States)
- Univ. of Colorado, Boulder, CO (United States)
A quark model that includes both scalar and vector contributions to the reaction mechanism (SV quark model) is used in a DWBA calculation of the {bar {Lambda}}{Lambda} production in {bar p}p interactions. Total and differential cross sections, polarizations, depolarizations, and spin-correlation coefficients are computed for laboratory momenta from the threshold to 1695 MeV/c. The free parameter of the calculation are the scalar and vector strengths, a quark-cluster size parameter, and the parameters of the unknown {bar {Lambda}{Lambda}} potentials. Good agreement with experiment is found for constructive interference of the scalar and vector terms and for {bar {Lambda}}{Lambda} potentials that differ from those suggested by several authors on the basis of SU(3) arguments. The fit to the data is better than that obtained by other quark models, which use only scalar or vector annihilation terms. The agreement with the experiment is also better than that found in meson-exchange models. The recent suggestion that measurement of the depolarization parameter D{sub nn} can be used to discriminate between meson-exchange and quark models is examined in detail. The authors conclude that a measurement of D{sub nn} will provide a test to find which of these models, as presently constructed, is the more appropriate description of strangeness production in the {bar p}p {yields} {bar {Lambda}}A reaction. 21 refs., 8 figs., 1 tab.
- OSTI ID:
- 50570
- Report Number(s):
- CONF-9309360--; CNN: Grant PHY-9223618
- Journal Information:
- Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 9 Vol. 57; ISSN 1063-7788; ISSN PANUEO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Antihyperon-hyperon production in a quark model
Antihyperon-hyperon production in a quark model