121033558
Dependence of shower particle pseudorapidity and pseudorapidity gap distributions on multiplicity in high-energy neutrino-emulsion collisions
The pseudorapidity and pseudorapidity gap distributions of shower particles in different event groups selected by multiplicity in 3\char21{}210 GeV neutrino-emulsion collisions are reported and analyzed by the thermalized cylinder model. It is shown that the pseudorapidity distribution has a slight dependence on the multiplicity and the pseudorapidity gap distribution does not depend on the multiplicity. The calculated results by the thermalized cylinder model are compared and found to be in agreement with the experimental data.
122136554
Unified description of multiplicity distributions of final-state particles produced in collisions at high energies
Abstract The paper presents a modelling description to multiplicity distributions of final-state particles measured in different collision systems at different center-of-mass energies. As examples distributions of charged particles (hadrons) measured in e + e − , pp, p p ¯ , and e + p collisions are presented and good agreement between the calculation and the data is found. Meanwhile, distributions of final-state particles produced in proton and heavy ion induced nuclear collisions are included in the framework of the unified description. The basis of the calculations is a weight sum of different Erlang distributions. The model assumption is that many sources of emitted particles are formed in collisions. Each source contributes multiplicity distribution like a radioactive object.
118607664
Singly and Doubly Charged Projectile Fragments in Nucleus-Emulsion Collisions at Dubna Energy in the Framework of the Multi-Source Model *
The multiplicity distributions of projectile fragments emitted in interactions of different nuclei with emulsion are studied by using a multi-source model. Our calculated results show that the projectile fragments can be described by the model and each source contributes an exponential distribution. As the weighted sum of the folding result of many exponential distributions, a multi-component Erlang distribution is used to describe the experimental data. The relationship between the height (or width) of the distribution and the mass of the incident projectile, as well as the dependence of projectile fragments on target groups, are investigated too.
118769689
Light fragment emission in Kr 86 - Sn 124 collisions at 25 MeV/nucleon
Light fragments emitted in $^{86}\mathrm{Kr}$-$^{124}\mathrm{Sn}$ collisions at intermediate energy (${E}_{\mathrm{beam}}=25$ MeV/nucleon) and larger impact parameters ($b=7\text{\ensuremath{-}}10$ fm) are studied by a multisource ideal gas model. The momentum component, transverse momentum, and azimuthal angle distributions of light fragments with mass numbers $A=1\text{\ensuremath{-}}4$ are given. Meanwhile, the correlation between the elliptic flow and transverse momentum, as well as the correlation between the fourth momentum anisotropy and transverse momentum for the mentioned light fragments are given, too. The calculated results are compared with the theoretical results of the Isospin-Dependent Quantum Molecular Dynamics model.
121373435
Investigation of correlations between conditional moments in nuclear fragmentation at high energy
The conditional moments of the charge distributions of the projectile fragments in O and S fragmentation are obtained using the partition method. Thus, the logarithmic correlations between the conditional moments can be observed. The electromagnetic dissociations are similar to the correlation behaviour of nuclear reactions. This is illustrated by the correlation behaviour of the oxygen nuclei, which are in agreement with that of the sulphur nuclei. The calculated results correspond to the experimental data of 3.7 and 200 GeV N−1 O–Em and 200 GeV N−1 S–Em interactions.
118846232
RAPIDITY AND TRANSVERSE-MOMENTUM DISTRIBUTION OF PRODUCED PARTICLES IN E+ E- ANNIHILATION AND PP COLLISION AT HIGH ENERGY
120288217
Comparing two-Boltzmann distribution and Tsallis statistics of particle transverse momentums in collisions at LHC energies
The transverse momentum distributions of final-state particles produced in collisions at energies available at the Large Hadron Collider (LHC) are studied by using the two-Boltzmann distribution and Tsallis statistics. Experimental distributions described by the two-Boltzmann distribution can be described by the Tsallis statistics. The two-temperature emission described by the two-Boltzmann distribution reflects temperature fluctuation of interacting system. The Tsallis statistics can describe the temperature fluctuation and the degree of non-equilibrium. The results calculated by the two-Boltzmann distribution and the Tsallis statistics are in agreement with the experimental data available at the LHC energies. In some cases, the two-Boltzmann distribution degenerates to (single) Boltzmann distribution.
56154903
Transverse Momentum Distributions of Final-State Particles Produced in Soft Excitation Process in High Energy Collisions
Transverse momentum distributions of final-state particles produced in soft process in proton-proton (pp) and nucleus-nucleus (AA) collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies are studied by using a multisource thermal model. Each source in the model is treated as a relativistic and quantum ideal gas. Because the quantum effect can be neglected in investigation on the transverse momentum distribution in high energy collisions, we consider only the relativistic effect. The concerned distribution is finally described by the Boltzmann or two-component Boltzmann distribution. Our modeling results are in agreement with available experimental data.
1752055
On transverse momentum event–by–event fluctuations in string hadronic models
Abstract. Transverse momentum event–by–event fluctuations are studied within the string–hadronic model of high energy nuclear collisions, LUCIAE. Data on non–statistical $p_T$ fluctuations in p+p interactions are reproduced. Fluctuations of similar magnitude are predicted for nucleus–nucleus collisions, in contradiction to the preliminary NA49 results. The introduction of a string clustering mechanism (Firecracker Model) leads to a further, significant increase of $p_T$ fluctuations for nucleus–nucleus collisions. Secondary hadronic interactions, as implemented in LUCIAE, cause only a small reduction of $p_T$ fluctuations.
121716503
Recent Results on Hadron Spectroscopy and Charmonium from BESIII
pp mass threshold enhancement is studied using the data sample of J/ψ and y(2S) collected with BESIII detector in 2009. The enhancement is evident in J/ψ radiative decay, which is consistent with BESII results. No significance narrow enhancement is observed in ψ(2S) radiative decay. The structure of Xlpar;1835) is also confirmed in J/ψ = γηπ+π− at BESIII. The spin‐singlet P‐wave charmonium state hc(1P ) is studied at BESIII, the mass spectra recoiling against the π0 in the decay ψ(2S) = π0hc both in hc inclusive decay and in the final states with a tagged E1‐transition photon from hc → γηr are fitted to extract the number of hc signals.
59422650
Transverse Momentum and Pseudorapidity Distributions of Charged Particles and Spatial Shapes of Interacting Events in Pb-Pb Collisions at 2.76 TeV
The transverse momentum and pseudorapidity distributions of charged
particles produced in Pb-Pb collisions with different centrality intervals at center-of-mass
energy per nucleon pair  TeV have been analyzed by using the improved
multisource thermal model in which the whole interacting system and then the sources
are described by the Tsallis statistics. The modelling results are in agreement with experimental data of the ALICE Collaboration. The rapidity distributions of charged particles are obtained according to the extracted parameter values. The shapes of interacting
events (the dispersion plots of charged particles) are given in the momentum, rapidity,
velocity, and coordinate spaces. Meanwhile, the event shapes in different spaces consisted
by different transverse quantities and longitudinal quantities are presented.