scholarly journals A look at hadronization via high multiplicity

2019 ◽  
Vol 204 ◽  
pp. 06009
Author(s):  
Elena Kokoulina ◽  
Andrey Kutov ◽  
Vladimir Nikitin ◽  
Vasilii Riadovikov ◽  
Alexander Vorobiev
Keyword(s):  
Cross Sections ◽  
Active Role ◽  
Multiparticle Production ◽  
High Multiplicity ◽  
Energy Increase ◽  
Dominance Model ◽  
Pion Multiplicity ◽  
200 Gev ◽  
Wide Energy ◽  
Two Stages

Multiparticle production is studied experimentally and theoretically in QCD that describes interactions in the language of quarks and gluons. In the experiment the real hadrons are registered. Various phenomenological models are used for transfer from quarks and gluons to observed hadrons. In order to describe the high multiplicity region, we have developed a gluon dominance model (GDM). It represents a convolution of two stages. The first stage is described as a part of QCD. For the second one (hadronization), the phenomenological model is used. To describe hadronization, a scheme has been proposed, consistent with the experimental data in the region of its dominance. Comparison of this model with data on e+e- annihilation over a wide energy interval (up to 200 GeV) has confirmed the fragmentation mechanism of hadronization, the development of the quark-gluon cascade with energy increase and domination of bremsstrahlung gluons. The description of topological cross sections in pp collisions within GDM testifies that in hadron collisions the mechanism of hadronization is being replaced by the recombination one. At that point, gluons play an active role in the multiparticle production process, and valence quarks are passive. They stay in the leading particles, and only the gluon splitting is responsible for the region of high multiplicity. GDM with inclusion of intermediate quark charged topologies describes topological cross sections in pp̅ annihilation and explains initial linear growth in the region of negative values of a secondary correlative momentum vs average pion multiplicity with increasing of energy. The proposed hadronization scheme can describe the basic processes of multiparticle production.

scholarly journals Collective phenomena in hadron and nuclear interactions at high multiplicity

2019 ◽  
Vol 206 ◽  
pp. 03001
Author(s):  
V. Dunin ◽  
A. Gribowsky ◽  
E. Kokoulina ◽  
A. Kutov ◽  
V. Nikitin ◽  
...  
Keyword(s):  
Cross Sections ◽  
Active Role ◽  
Light Nuclei ◽  
Multiparticle Production ◽  
High Multiplicity ◽  
Dominance Model ◽  
Carbon Target ◽  
Neutral Pions ◽  
Total Multiplicity ◽  
Two Stages

Multiparticle production is described in the language of quarks and gluons. In the experiment the real hadrons are registered. For transfer from quarks and gluons to observed hadrons, various phenomenological models are used. In order to describe the high multiplicity region, we have developed a gluon dominance model. It represents a convolution of two stages. First stage is described by QCD. For second one (hadronisation), the phenomenological model is used. The description of topological cross sections in p $ \bar p $ collisions within of our model testifies that in hadron collisions the mechanism of hadronisation is being replaced by the recombination one. At that point, gluons play an active role in the multiparticle production process, and valence quarks are passive. They stay in the leading particles, and only the gluon splitting is responsible for the region of high multiplicity. The model with inclusion of intermediate quark charged topologies describes topological cross sections in annihilation. We observe the significant growth of a scaled variance of number of neutral pions with increasing of the total multiplicity at U-70 accelerator at IHEP (Protvino). The following experiment with 3.5 A GeV deuteron, lithium and carbon beams of the Nuclotron (JINR, Dubna) falling at a carbon target is carried out at the NIS-GIBS setup. The noticeable excess yield of soft photons(pT < 50 MeV/c) is observed. The existing models based on Monte Carlo simulation and theoretical estimations predict a lower yield. Our Collaboration plans to study excess of soft photon yield and other phenomena at the SPD (Spin Physics Detector) setup at JINR, Dubna with polarised beams of proton and light nuclei up to 25 GeV.

scholarly journals Exploring the Partonic Phase at Finite Chemical Potential in and out-of Equilibrium

Particles ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 178-192 ◽  
Author(s):  
O. Soloveva ◽  
P. Moreau ◽  
L. Oliva ◽  
V. Voronyuk ◽  
V. Kireyeu ◽  
...  
Keyword(s):  
Cross Sections ◽  
Chemical Potential ◽  
Transport Coefficients ◽  
Gluon Plasma ◽  
Entropy Density ◽  
Baryon Chemical Potential ◽  
Equilibrium Study ◽  
200 Gev ◽  
Quasiparticle Model ◽  
Scattering Cross Sections

We study the influence of the baryon chemical potential μ B on the properties of the Quark–Gluon–Plasma (QGP) in and out-of equilibrium. The description of the QGP in equilibrium is based on the effective propagators and couplings from the Dynamical QuasiParticle Model (DQPM) that is matched to reproduce the equation-of-state of the partonic system above the deconfinement temperature T c from lattice Quantum Chromodynamics (QCD). We study the transport coefficients such as the ratio of shear viscosity η and bulk viscosity ζ over entropy density s, i.e., η / s and ζ / s in the ( T , μ ) plane and compare to other model results available at μ B = 0 . The out-of equilibrium study of the QGP is performed within the Parton–Hadron–String Dynamics (PHSD) transport approach extended in the partonic sector by explicitly calculating the total and differential partonic scattering cross sections based on the DQPM and the evaluated at actual temperature T and baryon chemical potential μ B in each individual space-time cell where partonic scattering takes place. The traces of their μ B dependences are investigated in different observables for symmetric Au + Au and asymmetric Cu + Au collisions such as rapidity and m T -distributions and directed and elliptic flow coefficients v 1 , v 2 in the energy range 7.7 GeV ≤ s N N ≤ 200 GeV.

Topological cross sections and pion multiplicity analysis forp¯pannihilations near 1 GeV/c

1975 ◽  
Vol 12 (3) ◽  
pp. 638-643 ◽  
Author(s):  
R. R. Burns ◽  
P. E. Condon ◽  
J. Donahue ◽  
M. A. Mandelkern ◽  
L. R. Price ◽  
...  
Keyword(s):  
Cross Sections ◽  
Pion Multiplicity

LUVE: A Constructive Learning Approach for Working with Parents

2002 ◽  
Vol 83 (3) ◽  
pp. 275-284 ◽  
Author(s):  
Lucía Santelices Cuevas ◽  
Verónica Astroza
Keyword(s):  
Sex Education ◽  
Teaching Strategy ◽  
Active Role ◽  
Descriptive Study ◽  
Learning Approach ◽  
Cross Sectional ◽  
Constructive Learning ◽  
Second Stage ◽  
Teachers And Parents ◽  
Two Stages

This study examines the application of a didactic teaching strategy called LUVE. Based on a constructivist learning approach, LUVE's purpose is to develop collaborative links between schools and parents, so that parents can improve their daily educational practices with their children and assume a more active role in their children's education. The project took place in Santiago, Chile, and was implemented in two stages. The first stage included a cross-sectional descriptive study with an experimental design, focusing on parents. The second stage involved teachers and parents who applied and carried out the LUVE strategy, The project's content focused on sex education, as this was the topic of interest to parents. The findings indicate that the strategy was a successful experience for the parents.

Nuclear division in the marine dinoflagellate Oxyrrhis marina

1986 ◽  
Vol 85 (1) ◽  
pp. 161-175
Author(s):  
X.P. Gao ◽  
J.Y. Li
Keyword(s):  
Nuclear Envelope ◽  
Phylogenetic Relationships ◽  
Nuclear Division ◽  
Metaphase Plate ◽  
Active Role ◽  
Ultrastructural Changes ◽  
Interphase Nuclei ◽  
Oxyrrhis Marina ◽  
Two Stages ◽  
Anaphase B

The nuclear division of Oxyrrhis marina is a very distinct one among the mitoses of dinoflagellates that have been studies. Using synchronized populations, we have investigated the ultrastructural changes in this nuclear division. In interphase, nuclei can be classified into two groups on the basis of the shapes of the chromosomes. Y- and U-shaped chromosomes have been observed in both types of interphase nuclei. By prophase the nucleus becomes oval, many nuclear plaques appear on the nuclear envelope, and many microtubules radiate from these nuclear plaques within the nucleus. Metaphase can be identified by the characteristic arrangement of the chromosomes; an equatorial metaphase plate is absent. As in many higher organisms, anaphase includes two stages: anaphase A and anaphase B. During anaphase A the nucleus does not apparently elongate and the chromosomes migrate towards the poles by a combination of the shortening of the chromosome-associated microtubules and the elongation of those located between daughter chromosomes. During anaphase B the nucleus elongates to about twice its former length. This elongation may result from growth of the interzonal nuclear envelope. Dividing nucleoli are associated with microtubules, which suggests that microtubules may play an active role in the division of the nucleolus. The evolution of mitosis and the phylogenetic relationships between Oxyrrhis, typical dinoflagellates and Syndinium are discussed.

scholarly journals Photon Atomic Parameters of Nonessential Amino Acids for Radiotherapy and Diagnostics

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ertuğrul O. Bursalıoğlu ◽  
Orhan İçelli ◽  
Begüm Balkan ◽  
H. Birtan Kavanoz ◽  
Mustafa Okutan
Keyword(s):  
Amino Acids ◽  
Cross Sections ◽  
Total Mass ◽  
Attenuation Coefficients ◽  
Wide Energy ◽  
Mass Attenuation Coefficients ◽  
Photon Interactions ◽  
Nonessential Amino Acids ◽  
Atomic Parameters ◽  
Mass Attenuation

The total mass attenuation coefficients (μt) (cm2/g) and atomic, molecular, and electronic effective cross sections have been calculated for nonessential amino acids that contain H, C, N, and O such as tyrosine, aspartate, glutamine, alanine, asparagine, aspartic acid, cysteine, and glycine in the wide energy region 0.015–15 MeV. The variations with energy of total mass attenuation coefficients and atomic, molecular, and electronic cross sections are shown for all photon interactions.

scholarly journals A measurement of cross sections for 16O Al and 16O Pb interactions at 60 and 200 GeV/c per nucleon

1988 ◽  
Vol 206 (1) ◽  
pp. 146-150 ◽  
Author(s):  
P.D. Barnes ◽  
R. Blaes ◽  
H. Braun ◽  
B. Castano ◽  
M. Cherney ◽  
...  
Keyword(s):  
Cross Sections ◽  
200 Gev
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