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931 results on '"Simonov, Yu."'

43. The scalar exotic resonances $$X(3915), X(3960), X_0(4140)$$ <math> <mrow> <mi>X</mi> <mrow> <mo>(</mo> <mn>3915</mn> <mo>)</mo> </mrow> <mo>,</mo> <mi>X</mi> <mrow> <mo>(</mo> <mn>3960</mn> <mo>)</mo> </mrow> <mo>,</mo> <msub> <mi>X</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mn>4140</mn> <mo>)</mo> </mrow> </mrow> </math>

Author

Badalian, A. and Simonov, Yu.

Abstract

The scalar resonances $$X(3915), X(3960), X_0(4140)$$ X ( 3915 ) , X ( 3960 ) , X 0 ( 4140 ) are considered as exotic four-quark states: $$cq\bar{c} \bar{q}, cs\bar{c} \bar{s}, cs\bar{c}\bar{s}$$ c q c ¯ q ¯ , c s c ¯ s ¯ , c s c ¯ s ¯ , while the X(3863) is proved to be the $$c\bar{c}, 2\,^3P_0$$ c c ¯ , 2 3 P 0 state. The masses and the widths of these resonances are calculated in the framework of the Extended Recoupling Model, where a four-quark system is formed inside the bag and has relatively small size ( $$\lesssim 1.0$$ ≲ 1.0 fm). Then the resonance X(3915) appears due to the transitions: $$J/\psi \omega $$ J / ψ ω into $$D^{*+}D^{*-}$$ D ∗ + D ∗ - (or $$D^{*0}\bar{D}^{*0})$$ D ∗ 0 D ¯ ∗ 0 ) and back, while the X(3960) is created due to the transitions $$D_s^+D_s^-$$ D s + D s - into $$J/\psi \phi $$ J / ψ ϕ and back, and the $$X_0(4140)$$ X 0 ( 4140 ) is formed in the transitions $$J/\psi \phi $$ J / ψ ϕ into $$D_s^{*+}D_s^{*-}$$ D s ∗ + D s ∗ - and back. The characteristic feature of the recoupling mechanism is that this type of resonances can be predominantly in the S-wave decay channels and has $$J^P=0^+$$ J P = 0 + . In two-channel case the resonance occurs to be just near the lower threshold, while due to coupling to third channel (like the $$c\bar{c}$$ c c ¯ channel) it is shifted up and lies by (20–30) MeV above the lower threshold. The following masses and widths are calculated: $$M(X(3915))=3920$$ M ( X ( 3915 ) ) = 3920 MeV, $$\Gamma (X(3915))=20$$ Γ ( X ( 3915 ) ) = 20 MeV; $$M(X(3960))=3970$$ M ( X ( 3960 ) ) = 3970 MeV, $$\Gamma (X(3960)=45(5)$$ Γ ( X ( 3960 ) = 45 ( 5 ) MeV, $$M(X_0(4140))= 4120(20)$$ M ( X 0 ( 4140 ) ) = 4120 ( 20 ) MeV, $$\Gamma (X_0(4140))=100$$ Γ ( X 0 ( 4140 ) ) = 100 MeV, which are in good agreement with experiment.

Published
2023

44. Theory of the deconfinement process in QCD

Author

Lukashov, M. S. and Simonov, Yu. A.

Subjects
High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Lattice, High Energy Physics - Lattice (hep-lat), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

The phenomenon of the deconfinement -- the spectacular drop of the colorelectric string tension at the critical temperature $T_c$-is studied within the method of field correlators (FCM) taking into account directly the contribution of the gluon condensate into the hadronic free energy. Using the resulting expressions for the free energy as a sum of the gluon condensate (the vacuum energy) and the hadronic pressure one obtains the possibility to calculate the deconfinement temperature $T_c$ and the temperature behavior of the string tension $\sigma_E(T)$ and the gluonic condensate $G_2(T)$ below $T_c$. The connection between the string tension and the quark condensate found in the framework of FCM allows the predict also the latter as a function of $T$ . These results are compared to the known lattice data of $T_c,\sigma_E(T)$, $\langle \bar q q\rangle(T)$ for hadronic media with different $n_f$ and $m_q$ and in the external magnetic field $eB$. The good agreement of the results of this approach with lattice data is demonstrated., Comment: 23 pages,3 figures

Published
2023

49. Theory of the Deconfinement in QCD.

Author

Lukashov, M. S. and Simonov, Yu. A.

Subjects
*QUANTUM chromodynamics, *GLUONS, *CRITICAL temperature, *MAGNETIC fields, *CORRELATORS, *QUARKS
Abstract

The phenomenon of the deconfinement—the spectacular drop of the colorelectric string tension at the critical temperature —is studied within the method of field correlators (FCM) taking into account directly the contribution of the gluon condensate into the hadronic free energy. Using the resulting expressions for the free energy as a sum of the gluon condensate (the vacuum energy) and the hadronic pressure one obtains the possibility to calculate the deconfinement temperature and the temperature behavior of the string tension and the gluonic condensate below . The connection between the string tension and the quark condensate found in the framework of FCM allows to predict also the latter as a function of . These results are compared to the known lattice data of , , for hadronic media with different and and in the external magnetic field . The good agreement of the results of this approach with lattice data is demonstrated. [ABSTRACT FROM AUTHOR]

Published
2023
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