Inclusive Reaction γp→π-+X++Mediated by Vector Meson Production
Nobuyuki Murai, Tateaki Sasaki · Progress of Theoretical Physics · 1973
The inclusive reaction γp→π-+X++ is investigated under the following assumptions: a) The pion spectrum results from the π meson decay, b) the vector meson dominance model for the photon is valid and c) distributions for favoured and disfavoured fragments are different. A simple π distribution scaling at relatively low energies leads quite well to the π- longitudinal distribution, with the effect of the “elastic” reaction γp→π0p excluded. The spectrum has the following features: 1) It increases in the central region and decreases in the proton fragmentation region as energy increases and 2) its slope is gentle in the photon fragmentation region. The π- distribution integrated over q⊥2 is predicted at Eγ=18, 30 and 100 GeV. Further, the inclusive reaction pp→π-+X3+ is supplementarily explored in a way consistent with γp→π-+X++ to see that the proton fragmentations have the same distribution irrespective of the impact p and γ. The increase of the distribution in the region |xπ|\lesssim0.1 with energy is well reproduced.