Relativistic Dynamics in pp --> pp{pi}{sup 0} near Threshold
Conference
·
OSTI ID:828648
Predictions for the cross section of pp {yields} pp{pi}{sup 0} near threshold are very sensitive to the description of the NN interaction and of the {pi}{sup 0} production mechanism. Chiral perturbation theory seems to imply a cancellation between the single-nucleon term and the pion-rescattering contribution near threshold. Various additional short-range meson-exchange mechanisms of relativistic origin, corresponding to intermediate state nucleons propagating with negative energy (''Z-graphs''), were seen to contribute significantly. The reaction at threshold involves a transferred hadronic momentum of typically p/m {approx} 0.4. Hence it is an ideal process to look for effects from relativistic dynamics. The authors examine the single-nucleon impulse term within the spectator-on-mass-shell (or Gross) description, which has already been applied successfully to the two and three-nucleon systems. The NN interactions obtained in this framework include non-minimal dynamical effects produced by off-shell scalar-nucleon couplings, scaled by a parameter {nu}, to which both NN-observables and the triton binding energy are rather sensitive. It is natural to investigate if it also works favorably for pp {yields} pp{pi}{sup 0}.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 828648
- Report Number(s):
- JLAB-THY-97-54; DOE/ER/40150-2861
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chiral power counting and pp {r_arrow} pp{pi}{sup 0} near threshold
Off-Mass-Shell {pi}N Scattering and pp {yields} pp{pi}{sup 0}
Relativistic study of the reaction pp. -->. dn: Formalism and comparison with experiment at T/sub p/ = 578 MeV
Journal Article
·
Sun Oct 01 00:00:00 EDT 1995
· Bulletin of the American Physical Society
·
OSTI ID:255586
Off-Mass-Shell {pi}N Scattering and pp {yields} pp{pi}{sup 0}
Conference
·
Sat Dec 30 23:00:00 EST 2000
·
OSTI ID:784256
Relativistic study of the reaction pp. -->. dn: Formalism and comparison with experiment at T/sub p/ = 578 MeV
Journal Article
·
Sat Mar 31 23:00:00 EST 1984
· Ann. Phys. (N.Y.); (United States)
·
OSTI ID:6466063