scholarly journals Energy Dependence of the  11-Distributions in Multiple Particle Production

1964 ◽  
Vol 32 (5) ◽  
pp. 866-868
Author(s):  
M. Namiki ◽  
I. Ohba
Keyword(s):  
Energy Dependence ◽  
Particle Production ◽  
Multiple Particle Production ◽  
Multiple Particle

scholarly journals Adiabatic expansion of nuclear matter gas to describe violation of Feynman scaling law in multiple particle production

2019 ◽  
Vol 208 ◽  
pp. 11006 ◽  
Author(s):  
Akinori Ohsawa ◽  
Edison H. Shibuya ◽  
Masanobu Tamada
Keyword(s):  
Nuclear Matter ◽  
Particle Production ◽  
Scaling Law ◽  
Boltzmann Distribution ◽  
Adiabatic Expansion ◽  
Forward Region ◽  
Final State ◽  
Rapidity Density ◽  
Multiple Particle Production ◽  
Multiple Particle

The main features of the rapidity density distribution of the produced hadrons in multiple particle production in nucleon collisions are; (a) the distribution in the forward region (ȳ ≥ 0) has a shape similar to the Fermi distribution, (b) the distribution in the most forward region reaches almost the maximum rapidity ymax = ln(√s/M) (M : nucleon mass), and (c) the shrinkage of the distribution from the maximum rapidity increases with the incident energy (i.e. violation of Feynman scaling law). These features are possible to be described by the assumptions that; (1) a fireball of the gas (made of nuclear matter, with the temperature Ti and with the shape of the incident nucleon with Lorentz contraction) is produced in the collision, (2) the fireball makes the adiabatic expansion, and (3) the constituent particles of the gas obey the Maxwell-Boltzmann distribution of the temperature Tf in the final state.

scholarly journals Linked Heavy Particle Model and Multiple Particle Production

1964 ◽  
Vol 31 (5) ◽  
pp. 840-857 ◽  
Author(s):  
Tetsuro Kobayashi ◽  
Mikio Namiki ◽  
Ichiro Ohba
Keyword(s):  
Particle Production ◽  
Heavy Particle ◽  
Particle Model ◽  
Multiple Particle Production ◽  
Multiple Particle

DESCRIPTION OF (PSEUDO-)RAPIDITY DENSITY AND TRANSVERSE MOMENTUM DISTRIBUTIONS IN A WIDE ENERGY RANGE $(\sqrt{s} = 22.4\hbox{--}7000~{\rm GeV})$

2012 ◽  
Vol 27 (09) ◽  
pp. 1250043 ◽  
Author(s):  
AKINORI OHSAWA ◽  
EDISON HIROYUKI SHIBUYA ◽  
MASANOBU TAMADA
Keyword(s):  
Transverse Momentum ◽  
Energy Dependence ◽  
Particle Production ◽  
Center Of Mass ◽  
Wide Energy Range ◽  
Charged Multiplicity ◽  
Mass System ◽  
Rapidity Density ◽  
Momentum Distributions ◽  
Multiple Particle Production

The rapidity density and transverse momentum distributions of produced particles in multiple particle production are formulated assuming that the produced particles are emitted isotropically from several emitting centers. The energy distribution of produced particles in the rest frames of respective emitting centers is that of the Tsallis statistics. The distribution of emitting centers is flat with slanting cuts at both shoulders on the rapidity axis in the center of mass system. The formulation includes six adjustable parameters, among which four are energy dependent and more important and are determined so that the transverse momentum and the (pseudo-)rapidity density distributions fit to the data at various energies. The energy dependences of the four parameters, determined empirically, reproduce quite well the energy dependence of the average transverse momentum, that of the pseudo-rapidity density at η* = 0 and that of the charged multiplicity. The energy dependence of the inelasticity is either increasing or decreasing from the assumed value of K = 0.5 at [Formula: see text], due to lack of experimental data at the most-forward rapidity region. The pseudo-rapidity density distribution at LHC energy [Formula: see text] expected by the present formulation is compared with those by the other models.

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