# Large P_T Hadron Production, Related Processes and a Composite Model of Quark

## 概要

It is shown that a composite model of quark we have proposed can explain the P_T^<-8> behavior in large P_T hadron production. The key point is that the form factor of quark behaves (Q^2)^<-1/2> at large Q^2 in our model. Our model marks unique predictions in many respects which are different from quark parton model makes unique predictions in many respects which are different from quark parton model with anomalous quark-quark scattering.In our model, ρ_J^<pp>〜P_T^<-8>(1-x_T)^5, ρ_J^<πρ> 〜P_T^<-8>(1-x_T)^<3.5>, ρ_<pp→π^0>x/ρ_<πp→π^0>x 〜(1-x_T)^<3/2> near x_T=1 and dσ/dt_ <pp→pp>〜s<-10>f(θ) at large s and fixed θ. The ratio of multiplicity functions in lepton processes to pp→Jet+X behaves (1-z) near Z=1. The exponent m(ρ〜P_T^<-8>(1-x_T)^m or (dσ/dz)/σ〜 (1-z)^m) in various single hadron production processes is also discussed.