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Compressibility of Nuclear Matter from the Chiral Soliton Model
Ulugbek Yakhshiev 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.3
The compressibility of isospin symmetric nuclear matter is studied in the framework of the in-medium modi¯ed chiral soliton model. On one hand, in the mesonic sector, the model is related to pion physics in nuclear matter while on the other hand, in the many baryonic sector, it reproduces the volume term coe±cient aV of the semi-empirical binding energy formula. Within our framework,we found an interesting result that aV became density independent in the region ½ 2 [0:35½0; 1:08½0]. The model reproduces well the compression modulus, K » 300 MeV, of isospin symmetric and in¯nite nuclear matter. The compressibility of isospin symmetric nuclear matter is studied in the framework of the in-medium modi¯ed chiral soliton model. On one hand, in the mesonic sector, the model is related to pion physics in nuclear matter while on the other hand, in the many baryonic sector, it reproduces the volume term coe±cient aV of the semi-empirical binding energy formula. Within our framework,we found an interesting result that aV became density independent in the region ½ 2 [0:35½0; 1:08½0]. The model reproduces well the compression modulus, K » 300 MeV, of isospin symmetric and in¯nite nuclear matter.
Test of the nonrelativistic $$c\bar{c}$$ potential
Yakhshiev Ulugbek 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.4
We analyze the charmonium states by testing a phenomenological nonrelativistic potential and propose a new set of parameters. This new set of parameters is fixed using only the lowest lying S-wave states of charmonia where the spin-orbit and the tensor interactions will not contribute. After fitting the parameters, we analyze the whole fine structure of charmonium states taking into account the spin-orbit and the tensor interactions. Calculations showed that the nonrelativistic potential model with a phenomenologically defined parameters was indeed a good approximation for describing the charmonium states.
Jung, Ju-Hyun,Yakhshiev, Ulugbek,Kim, Hyun-Chul,Schweitzer, Peter American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.11
We investigate the energy-momentum tensor form factors of the nucleon in a nuclear medium, based on an in-medium modified pi-rho-omega soliton model, with medium modifications of the mesons considered. The results allow us to establish general features of medium modifications of the structure of nucleons bound in a nuclear medium.
Mesons and nucleons from holographic QCD in a unified approach
Kim, Hyun-Chul,Kim, Youngman,Yakhshiev, Ulugbek IOP Publishing Ltd 2009 Journal of high energy physics Vol.2009 No.11
We investigate masses and coupling constants of mesons andnucleons within a hard wall model of holographic QCD in a unifiedapproach. We first examine an appropriate form of fermionicsolutions by restricting the mass coupling for the five dimensionalbulk fermions and bosons. We then derive approximated <I>analytic</I>solutions for the nucleons and the corresponding masses in a smallmass coupling region. In order to treat meson and nucleonproperties on the same footing, we introduce the same infrared (IR)cut in such a way that the meson-nucleon coupling constants, i.e.,<I>g</I><SUB>π<I>NN</I></SUB> and <I>g</I><SUB>ρ<I>NN</I></SUB> are uniquely determined. The firstorder approximation with respect to a dimensionless expansionparameter, which is valid in the small mass coupling region,explicitly shows difficulties to avoid the IR scale problem of thehard wall model. We discuss possible ways of circumventing theseproblems.