Quark Model and High Energy Collisions

Anisovich, V.V.; Kobrinsky, M. N.; Shabelski, Yu. M.; Nyíri, J.

doi:10.1142/9789812794925

Cited by 28 publications

(25 citation statements)

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“…This approach resembles the Landau phenomenological hydrodynamic approach of multiparticle production in relativistic particle interactions [3], which was found to be in good agreement with the multiplicity data in particle and nuclear collisions in the wide energy range. In the picture proposed in [15,16], the Landau hydrodynamics is combined with the constituent quark model [17]. This makes the secondary particle production to be basically driven by the amount of the initial effective energy deposited by participants-quarks or nucleons, into the Lorentz contracted overlap region.…”

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confidence: 99%

Effective-energy budget in multiparticle production in nuclear collisions

et al. 2014

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The dependencies of charged particle pseudorapidity density and transverse energy pseudorapidity density at midrapidity on the collision energy and on the number of nucleon participants, or centrality, measured in nucleusnucleus collisions are studied in the energy range spanning a few GeV to a few TeV per nucleon. The approach in which the multiparticle production is driven by the dissipating effective energy of participants is introduced. This approach is based on the earlier proposed consideration, combining the constituent quark picture together with Landau relativistic hydrodynamics shown to interrelate the measurements from different types of collisions. Within this picture, the dependence on the number of participants in heavy-ion collisions are found to be well described in terms of the effective energy defined as a centrality-dependent fraction of the collision energy. For both variables under study, the effective-energy approach reveals a similarity in the energy dependence obtained for the most central collisions and centrality data in the entire available energy range. Predictions are made for the investigated dependencies for the forthcoming higher-energy measurements in heavy-ion collisions at the LHC. 1.Multiparticle production in high-energy particle and nuclear collisions attracts high interest, as, on the one hand, the observables measured first in high-energy collisions, namely multiplicity and transverse energy, are immediate characteristics of this process and bring important information on the underlying dynamics of strong interactions, while on the other hand, this process still eludes its complete understanding. It is already more than half a century as the multia e-mail: Aditya.Nath.Mishra@cern.ch b e-mail: Raghunath.Sahoo@cern.ch c e-mail: sedward@mail.cern.ch d e-mail: Alexandre.Sakharov@cern.ch plicity of the produced particles are considered to be derived by the collision energy [1][2][3]. In this picture the energy pumped into the collision zone in the very first stage of the collision defines the volume of the interaction lump of participant patterns. Later on, the approach of "wounded" nucleons, or nucleon participants, has been proposed to describe the multiplicity and particle distributions [4]; for a review, see [5]. In this approach the multiplicity is expected to be proportional to the number of participants. However, it was observed at RHIC and similarly at LHC energies, the concept of wounded nucleons does not describe the measurements where the data found to demonstrate an increase with the number of nucleon participants. The problem has been addressed in the nuclear overlap model using Monte Carlo simulation in the constituent quark framework, and the scaling has been shown to be restored [6][7][8][9][10][11]. In addition, it was observed that the multiplicity and midrapidity-density distributions are similar in e + e − and in the most central (headon) nuclear collisions [12] at the same center-of-mass (c.m.) energy pointing to the universality of multihadron pro...

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Effective-energy budget in multiparticle production in nuclear collisions

et al. 2014

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“…The estimate made for high energy collisions gives λ = 0.4 − 0.6 [1], while in hadron decays it was evaluated as λ ≃ 0.8 [19].…”

Section: Quark Combinatoric Rules For the Decay Couplings Of The Quarmentioning

confidence: 99%

“…Phenomenological investigations, as well as theoretical estimates, show that in the strong interaction region we deal with constituent quarks and effective massive gluons (for more detail see, for example, [1] and references therein). In the paper [2], V.N.…”

Section: Introductionmentioning

confidence: 99%

Scalar Mesons and Low-Mass Sigma: Does the Σ Reveal the Confinement Singularity?

Anisovich

2006

Int. J. Mod. Phys. A

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I present a short review of the current understanding of the scalar meson sector, with special attention to the problem of the low-mass σ. The dispersion relation N/D-method used for the restoration of the low-energy ππ (IJ P C = 00 ++ )-wave amplitude is discussed. The low-energy ππ amplitude was determined from the data in the energy region 280-500 MeV and it was sewn with the previously found K-matrix solution for the region MeV. The N/D-amplitude has a pole on the second sheet of the complex-s plane, near the ππ threshold at √ s ≃ 430 − i325 MeV, that corresponds to the low-mass σ-meson. I discuss the hypothesis that this pole may be related to the confinement forces, thus being the eyewitness of confinement.

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“…A better knowledge of the details of g A (s) is necessary. 4 For the pseudoscalar coupling f 5 P (n), making use of the expression (36), we obtain…”

Section: A Decay Constants Of Pseudoscalar Mesonsmentioning

confidence: 99%

“…For the description of the mass spectrum of hadrons and their interactions at low momentum transfers, QCD-inspired constituent quark models (i.e., models based on constituent-quark degrees of freedom in which mesons appear asQQ bound states in a potential) proved to be quite successful [2,3]. Moreover, there are many pieces of evidence that the constituent-quark picture provides a good description not only of the mass spectrum of hadrons, but also of their interactions at not too large momentum transfers [4,5,6,7]. Just because of the proper description of the hadron mass spectrum, the Lagrangian of the constituent quark model cannot be chirally invariant (otherwise it would produce a chirally invariant spectrum of hadron states).…”

Section: Introductionmentioning

confidence: 99%

Constituent quarks, chiral symmetry, and chiral point of the constituent quark model

2006

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We construct the full axial current of the constituent quarks by a summation of the infinite number of diagrams describing constituent-quark soft interactions. By requiring that the conservation of this current is violated only by terms of order O(M 2 π ), where Mπ is the mass of the lowest pseudoscalar QQ bound state, we derive important constraints on (i) the axial coupling gA of the constituent quark and (ii) theQQ potential at large distances. We define the chiral point of the constituent quark model as those values of the parameters, such as the masses of the constituent quarks and the couplings in theQQ potential, for which Mπ vanishes. At the chiral point the main signatures of the spontaneously broken chiral symmetry are shown to be present, namely: the axial current of the constituent quarks is conserved, the leptonic decay constants of the excited pseudoscalar bound states vanish, and the pion decay constant has a nonzero value.

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Quark Model and High Energy Collisions

Abstract: He has published over 150 research papers on the theory and the phenomenological aspects of multiparticle production processes, nuclear target phenomena, heavy quark production on nucleon targets, heavy ion physics and some applied physics problems.

Cited by 28 publications

References 1 publication

Effective-energy budget in multiparticle production in nuclear collisions

Effective-energy budget in multiparticle production in nuclear collisions

Scalar Mesons and Low-Mass Sigma: Does the Σ Reveal the Confinement Singularity?

Constituent quarks, chiral symmetry, and chiral point of the constituent quark model

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