Search

Analyses of P/sub perpendicular/ and x,z distributions of inclusive e/sup +/e/sup -/..-->..hh-bar from experiments at the SLAC storage ring PEP at 29 GeV confirm that there is only one temperature T = 196 +- 7 MeV of e/sup +/e/sup -/ annihilation for various hadrons, as predicted by Chou and Yang. It is found that TproportionalE/sup 1/4/ according to the TASSO data; its relationship with the impact parameter b sets a lower limit (for b = 0) T/sub 0/approx.106 MeV related to the effective light-quark mass m/sub q/ = 3,T/sub 0/approx. =318 MeV. Hadron multiplicities from PEP experiments, covering approx.3 orders of magnitude, are accounted for by a semiempirical formula derived from the Boltzmann factor with quark contents and a unique temperature T = 196 MeV for all hadrons under investigation.

A kinematic method is considered to estimate the quark mass from e/sup +/e/sup -/..-->..qq-bar..-->..hadrons. It is based on a well-known linear relationship between the average meson multiplicity and the fireball mass, crucial tests being made with ..pi.. production by pp collisions and p-barp annihilations. Applied to the multiplicity data of e/sup +/e/sup -/ annihilation from ADONE, the method yields for the effective mass of the light quarks 0.33 +- 0.03 GeV.

Cross sections of the inclusive reactions ..pi../sup -/A, p-barA, and ..gamma..A..-->..J/psi+... at P/sub lab/approx. =40 and 125 GeV/c are investigated using the geometric model with the same A dependence as expected from the Fermi distribution of nuclear density. The fits agree well with the data. An overall fit to all four sets of data assuming a constant absorption mean free path and a power law for the energy dependence of the radius parameter indicates no anomaly of J/psi production from the W and Pb targets. It is found that due to the threshold effect the temperature of J/psi is much cooler than the ..pi.. temperature. A remark is made on a similar formula for the cross section of the nucleus-nucleus reaction.

Fireball properties have been investigated using results of previous analyses of inclusive $p\ensuremath{-}p$ data in terms of a Bose-type distribution modified by a scaling parameter. A discussion is presented on the relation between the scaling parameter and the longitudinal velocity of the fireball. It is found that the transverse motion may account for large-${P}_{T}$ distributions at 90\ifmmode^\circ\else\textdegree\fi{} c.m. angle and that this motion is not detectable for ${P}_{T}l1.5$ GeV/c. The fireball mass is found to increase as ${({\ensuremath{\gamma}}_{\mathrm{c}.\mathrm{m}.}\ensuremath{-}1)}^{\frac{1}{2}}$, ${\ensuremath{\gamma}}_{\mathrm{c}.\mathrm{m}.}$ being the Lorentz transformation factor from lab to c.m. system.

Simple relationships are found for meson multiplicities as linear functions of the fireball mass, the energy dependence being determined by the scaling property of each reaction. In this way, only three parameters related to the proton, the meson, and the photon-lepton fireball, are needed to account for multiplicities from eight reactions: pp, ..pi../sup +/p, K/sup +/p, ..gamma..p, e/sup -/p, ..mu../sup -/p, and ..nu..p, as well as p-barp annihilation.

A remark is made on the Maxwell distribution, including the mass motion to account for the anisotropy of angular distribution. This distribution is used to analyze secondaries emitted at 180degree by p-nucleus reactions in a Pennsylvania--Los Alamos--Temple experiment. The velocity of the mass motion is compared with that of the Fermi motion.

Large-P/sub perpendicular/ distributions for ..pi../sup plus-or-minus/ and K/sup plus-or-minus/ from p-nucleus collisions of the Chicago-Princeton experiment are analyzed using a Bose-type distribution. A discussion is presented on the behavior of two parameters, temperature and transverse velocity of the fireball. The A dependence of cross sections is found to follow a power law A/sup alpha/, with ..cap alpha.. = 0.86 for ..pi../sup plus-or-minus/ as well as for K/sup plus-or-minus/. A comparison with data from a CERN ISR experiment shows a striking similarity in meson production by p-p and p-nucleus collisions. Remarks from the viewpoint of the Boltzmann factor are made about the P/sub perpendicular/ distribution of the new particle J (3.1) from nucleon-nucleus collisions. (AIP)

K-meson production by p - bar annihilation was investigated using an isobar model. A comparison of the predictions of this model with the experimental data excludes the assumption of an isobar state of ( pi pi ) having a mass greater than three pion masses. (auth)