A general and linear relationship is found between the fireball mass M* and the multiplicity ( n ) of mesons from pp collisions and Fp annihilations, the characteristics of M* being determined by the scaling parameter used to modify the Bose-Einstein distribution. In the scaling limit, this relationship is identical with the well known power law < n ) a: Ell2. A remark is made on its extension to asymmetric fireballs such as pion-nucleon collisions.
The interaction parameters in the high-T, superconductor La2Cu04 are calculated. The results show that U;J is too large to be neglected.The discovery of high-temperature superconductivity (HTSC) has been a great challenge to condensed matter theory. Various models have been proposed to interpret the origin of this unexpected phenomenon. Among them, the resonance-valence-bond model, proposed by Anderson and based on the Hubbard model, has attracted much attention among physicists concerned with condensed matter theory.
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