Naomichi Suzuki

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The evolution of charged-particle production in collisions of heavy ions at relativistic energies is investigated as function of centrality in a nonequilibrium-statistical framework. Precise agreement with recent d + Au and Au + Au data at √ sNN = 200 GeV is found in a Relativistic Diffusion Model with three sources for particle production. Only the(More)
Abstract. In order to describe large transverse momentum (pT ) distributions observed in high energy nucleus-nucleus collisions, a stochastic model in the three dimensional rapidity space is introduced. The fundamental solution of the radial symmetric diffusion equation is Gaussianlike in radial rapidity. We can also derive a pT or radial rapidity(More)
We analyze various data of multiplicity distributions by means of the Modified Negative Binomial Distribution (MNBD) and its KNO scaling function, since this MNBD explains the oscillating behavior of the cumulant moment observed in e+e− annihilations, h-h collisions and e-p collisions. In the present analyses, we find that the MNBD (discrete distributions)(More)
Theoretical prediction of oscillations of cumulant moments of parton multiplicity distributions inside a jet supported by experimental data in some multiple production processes asks for analysis of the phenomenon for the whole set of available reactions. We have found out that the oscillations persist in any kind of processes and increase for particles(More)
We developed a capillary chromatography system using a phase-separated solvent mixture as a carrier solution--i.e., a water-hydrophilic/hydrophobic organic solvent mixture--which we call "tube radial distribution chromatography" (TRDC). Here, we attempted to apply the TRDC system to a microchip incorporating microchannels with a double T-junction for(More)
Oscillatory behavior of cumulant moments obtained from the experimental data in pp collisions and p̄p collisions are analyzed by the modified negative binomial distribution (MNBD) and the negative binomial distribution (NBD). Both distributions well describe the cumulant moments obtained from the data. This fact shows sharp contrast to the result in ee(More)
(dNch/dη)dη and find that there is scaling phenomenon among (Nch) dNch/dη = dn/dη with different centrality cuts at √ sNN = 130 GeV. To explain this scaling behavior of dn/dη, we employ a stochastic approach using the Ornstein-Uhlenbeck process with two sources. A Langevin equation is adopted for this explanation. Moreover, comparisons of dn/dη at √ sNN =(More)
The extent of a locally equilibrated parton plasma in d + Au collisions at √ sNN = 200 GeV is investigated as a function of collision centrality in a nonequilibrium-statistical framework. Based on a three-sources model, analytical solutions of a relativistic diffusion equation are in precise agreement with recent data for charged-particle pseudorapidity(More)