Hydrodynamical Model of Multiparticle Production at Large Transverse Momentum

The large transverse momentum phenomena in the central region can be understood by considering the hydrodynamical expansion of a "fireball " which is formed in the collision of hadrons. The hydrodynamical equation of the hadronic flmd with large transverse velocity is solved analytically in the central region under the appropriate boundary condition. For the case of the relativistic three-dimensional ideal fluid, the resultant particle spectrum EdN/d'p at large transverse momentum has the form s'1'p'i ' which is consistent with the ISR data. Recent experiments of high energy hadron collisions accumulate a large amount of data and reveal many interesting features of multiple production phenomena. One of them is the phenomenon at large transverse momentum. It has been found in the measurements at CERN ISR and NAL that the differential cross section o