S-wave $π^0$ Production in pp Collision in a Covariant OBE Model

Details S-wave $π^0$ Production in pp Collision in a Covariant OBE Model S-wave $π^0$ Production in pp Collision in a Covariant OBE Model

1998-03-09

arxiv.org/abs/nucl-th/9803028v2

Nucl.Phys.A652:287-307,1999

Physics

Nuclear Physics

Nuclear Theory

REVTeX, graphicx, 22 pages (icluding 10 figures)

Scientific paper

10.1016/S0375-9474(99)00140-2

The total cross section for the pp -> pp pi^0 reaction at energies close to threshold is calculated using a covariant one-boson-exchange model, where a boson B created on one of the incoming protons is converted into a neutral pion on the second. The amplitudes for the conversion processes, B N -> N pi^0, are taken to be the sum of s, u and t-channel pole terms. The main contributions to the primary production amplitude is due to an effective isoscalar sigma meson pole in a t-channel, which is enhanced strongly due to offshellness. With this contribution included the model reproduces, both the scale and energy dependence of the cross section.

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