Hujio Noda

Increase of single-particle spectra and a new form of scaling. inclusive reactions and urbaryon rearrangement diagrams. v

The properties of a formula for single-particle distribution function are investigated in connection with the mechanism of the increase of some spectra with energy. A new form of scaling, which approaches Feynman scaling at asymptotic energies, is proposed. Recent experiments on p+p-7(p,K- and rr-) +anything up to ISR energies are consistent with the new scaling, in which the energy dependence and the longitudinal shape of the spectrum are simultaneously determined by single parameter for. each species of the produced particle. The concave rise of the averaged multiplicity up to ISR energies is obtained as a result of the new scaling: above ISR energies, the logarithmic increase is predicted to set in. The transverse shapes of spectra are shown to reveal their common dependence on longitudinal mass, after factorizing out an energy dependent part on the basis of the new scaling.

KALUZA–KLEIN BLACK HOLES WITH SQUASHED HORIZONS AND HAWKING–HOROWITZ MASS

The mass of the Kaluza–Klein black holes is investigated by means of the thermodynamic potential and the Hawking–Horowitz mass. It is pointed out that the mass estimated from the thermodynamic potential agrees with the Hawking–Horowitz mass. The mass of the limiting cases of the Kaluza–Klein black holes is discussed.

MULTI-CHAIN MODEL WITH SUCCESSIVE COLLISION AND HIGH-ENERGY NUCLEUS–NUCLEUS COLLISIONS

High-energy nucleus–nucleus collisions are studied in the multi-chain model with successive collision. Analytic forms for the longitudinal momentum distribution of the inclusive reaction are discussed. It is shown that the longitudinal momentum distribution in nucleus–nucleus collisions is expressed in the Glauber probability with the hypergeometric distribution.

ANTI-HYPERON POLARIZATION IN pA AND Σ-A COLLISIONS AND INTRINSIC ANTIDIQUARK STATE IN INCIDENT BARYON

We discuss the relation between the polarization of inclusively produced (anti)hyperons and the incident baryon states in the framework of the constituent quark–diquark cascade model. We assume that there is an intrinsic diquark–antidiquark state in the incident baryon, in which the intrinsic diquark immediately fragments into a non-leading baryon and the antidiquark behaves as a valence constituent. It is also assumed that the valence (anti)diquark in the incident nucleon tends to combine selectively with a spin-down sea quark and, on the other hand, the spin-up valence quark in the projectile is chosen by a sea (anti)diquark in preference to the spin-down valence quark. It is found that the incident spin-1/2 baryon is mainly composed of a spin-0 valence diquark and a valence quark, and contains an intrinsic diquark–antidiquark state with a probability of about 7%.

Hyperon polarization in quark-diquark cascade model

We relate the hyperon polarizations in proton-proton and proton-nucleus collisions to the leading particle effect and use the constituent quark-diquark cascade model with SU(6) wave function. We assume that the quantization axis is characterized by the production normal of the leading baryon of the most massive cascade chain and the incident valence diquark tends to pick up a spin down sea quark or conversely a sea diquark preferentially combines with the spin up incident valence quark to form a leading baryon as compared with the spin down valence quark.

Charmed hadron production in

We investigate the meson, baryon and anti-baryon productions in \pi p and Kp collisions in terms of a constituent cascade model which includes charm flavour. The constituent diquark in an incident baryon has a tendency to get a large momentum fraction, resulting in considerable difference of subenergies for particle productions from quark-diquark and quark-antiquark chains in a meson-baryon collision. As a consequence, the leading particle effects on D meson productions are expected to be quite different in \pi+ and \pi- beams at present accelerator energies.

Non-Diffractive Mechanism in Multi-Particle Production Processes

As a first step to clarify the production mechanisms of multiparticle reactions, the nondiffractive mechanism is investigated, which is specified by the non-Pomeron exchange based on the multi-Regge model. The magnitude of the t/ sub i/-cut and the quality of effective trajectories are determined. (LBS)