Relativistic effects and angular dependence in the reaction antiproton-proton -> pi^- pi^+

Details Relativistic effects and angular dependence in the reaction antiproton-proton -> pi^- pi^+ Relativistic effects and angular dependence in the reaction antiproton-proton -> pi^- pi^+

2004-03-23

arxiv.org/abs/nucl-th/0403071v1

Phys.Rev. C70 (2004) 034002

Physics

Nuclear Physics

Nuclear Theory

Revtex 4, 7 pages, 5 figures. Continuation and results of a previous paper: nucl-th/0403050

Scientific paper

10.1103/PhysRevC.70.034002

We present a new fit to the LEAR data on antiproton-proton -> pi^- pi^+ 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 \ge 2 partial wave amplitudes. The fit to the data is improved significantly.

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