Showing papers in "Progress of Theoretical Physics Supplement in 1973"

Fire-balls and accelerator experiments

Abstract: The energy of accelerator has been increasing and already come to 300 GeV at NAL and 1,500 GeV at CERN machine. These large proton ac­ celerators are offering a large number of and various kinds of data on the multiple production of tnesons in high energy regions, which have been offered till the present only by the cosmic-ray experiments. The cosmic-ray experiments already gave indication for the existence of a spherical fire-ball with constant mass and temperature as the intermediate product of the multiple production of mesons.1),2) The authors made a fire­ ball study with the bubble chamber film on 10 GeV 7T--p collisions and with the emulsion stacks exposed to 24 Ge V proton beam, and the results showed existence of a spherical fire-ball of mass -2.4· GeV.3) From the above results it becomes highly probable that a fire-ball is playing an essential role for the multiple meson production over a wide range of energies, i.e., from about 10 GeV up to around 100,000 GeV.2),3) Further­ more, the physical properties of a fire-ball, such as its rest energy and temper­ ature, appear to remain constant, and increase of available energy is causing increase of velocity and number of produced fire-balls. These features are consistent with the H-quantum model. 4 > Because of importance of the conclusion and the information from the large accelerators being now available, the authors made a general survey over the published results on the multiple meson production from the acceler­ ator experiments, on the basis of the hypothesis of a fire-ball of constant mass and temperature. The results show that all the available data are in good consistency with the hypothesis and Serpukhov, NAL and CERN experiments are covering the region of production of two, three, four or more fire-balls.

On the Multiplicity Distribution in Hadronic Interaction at High Energy

Abstract: Frqm recent experiments with the accelerators at Serpukhov and NAL we have now some knowledge on the multiplicity distribution of mesons in hadronic interactions at laboratory incident energies in the range (50,_,400) GeV. On the basis of the current idea that in the energy range covered by the accelerators now working hadron reactions have yet reached their asymptotic limits, that is, on the assumption that we are in the '' asymptotia' ', there have been many trials to get a universal function describing the experimental multiplicity distribution now obtained. One of such trials is Buras and . Koba's one,l) who used functions of the type such as ze-1rz / 4 , or its mixture with z3e-1l"Z/4, to fit the experimental data, along Koba, Nielsen and Olesen's idea2> that the multiplicity distribution should be represented by a unique function z=n/(n) at high energies, where n and (n) are the multiplicity and the mean multiplicity, respectively. On the other hand, in journals there has been paid much interest in the fact that the experimental data give us .a value of about two for the ratio of the mean multiplicity to the standard deviation (n)/ { (n2)-(n)2} l/2, or, being expressed in another way, in the fact that the quantity /2=(n(n-l)) (n)2 is not zero experimentally. This is because the multiplicity distribution would be expected to be like the Poisson distribution, if one may take the bremsstrahlung analogy for the multiple production of mesons in hadronic interactions at high energy, and with the Poisson distribution one has D= ..J(n) and /2=0. The bremsstrahlung analogy has been used by Feynman3)

Excitation of Hadronic Matter and H-quantum *)

Abstract: (The mass levels of mesons and ba~yon resonances are studied from the view-point of the compositeness of "molecule-type". The model of the density oscillation in the hadronic matter is discussed in connection with the mass levels of mesons, and an estimation of the sound velocity of the density oscillation is given by applying the theory of collective motion. The mass levels of baryon resonances are discussed in relation with MagliC's rule and the theory of intermediate coupling. H-quantum is discussed as being due to a kind of col­ lective motion in the hadronic matter arising from strong correlations which are not taken into account in the collective motion for the density oscillation.