Relativistic effects and angular dependence in the reaction p¯ p→ π- π+
Abstract
We present a fit to the low energy antiproton ring at CERN data on p¯ p→ π- π+ differential cross sections and analyzing powers motivated by relativistic considerations. Within a quark model describing this annihilation, we argue, since the pions are highly energetic, that relativistic effects cannot be neglected. The intrinsic pion wave functions are Lorentz transformed to the center-of-mass frame. This change in quark geometry gives rise to additional angular dependence in the transition operators and results in a relative enhancement of higher J⩾2 partial wave amplitudes. The fit to the data is improved significantly.
- Publication:
-
Physical Review C
- Pub Date:
- September 2004
- DOI:
- 10.1103/PhysRevC.70.034002
- arXiv:
- arXiv:nucl-th/0403071
- Bibcode:
- 2004PhRvC..70c4002E
- Keywords:
-
- 13.75.Cs;
- 12.39.Jh;
- 21.30.Fe;
- 25.43.+t;
- Nucleon-nucleon interactions;
- Nonrelativistic quark model;
- Forces in hadronic systems and effective interactions;
- Antiproton-induced reactions;
- Nuclear Theory
- E-Print:
- Revtex 4, 7 pages, 5 figures. Continuation and results of a previous paper: nucl-th/0403050