TY  - CONF
AU  - Ignjatović, Siniša R.
AU  - Borka Jovanović, Vesna
AU  - Borka, Duško
AU  - Jovanović, Predrag
PY  - 2019
UR  - http://aip.scitation.org/doi/abs/10.1063/1.5091205
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8093
AB  - The simplest form of the Hyperfine Interaction (HFI) of quarks is a color-spin interaction, sometimes called Fermi-Breit (FB) HFI. For conventional hadrons, this HFI for quark-antiquark (qq) pairs is twice as strong as the same HFI for quark-quark (qq or qq) pairs, but this difference is absorbed into the different HFI constants for mesons and baryons, which are free parameters of the fits. For tetraquarks, however, qqHFI is only half as strong as the qq/qqHFI and both kinds of pairs coexist within the same state. Hence it is worth investigating a model with different fit constants for qq and qq/q pairs. We have investigated 3 models of spin-color HFI for light scalar tetraquarks: 2 models with single constants for both kinds of pairs and one model with different fit constants. The light scalar nonet is chosen because of a lack of other experimentally observed multiplets interpretable as pure exotic states. Since even the nonet contains only 3 particles with distinct masses (i. e. 3 fit points), the constituent quark masses had to be taken from conventional hadron fits obtained in our previous work. The two-constant model did not prove to be a viable alternative to the one-constant models. © 2019 Author(s).
C3  - AIP Conference Proceedings
T1  - Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states
VL  - 2075
SP  - 080004
DO  - 10.1063/1.5091205
ER  - 

@conference{
author = "Ignjatović, Siniša R. and Borka Jovanović, Vesna and Borka, Duško and Jovanović, Predrag",
year = "2019",
abstract = "The simplest form of the Hyperfine Interaction (HFI) of quarks is a color-spin interaction, sometimes called Fermi-Breit (FB) HFI. For conventional hadrons, this HFI for quark-antiquark (qq) pairs is twice as strong as the same HFI for quark-quark (qq or qq) pairs, but this difference is absorbed into the different HFI constants for mesons and baryons, which are free parameters of the fits. For tetraquarks, however, qqHFI is only half as strong as the qq/qqHFI and both kinds of pairs coexist within the same state. Hence it is worth investigating a model with different fit constants for qq and qq/q pairs. We have investigated 3 models of spin-color HFI for light scalar tetraquarks: 2 models with single constants for both kinds of pairs and one model with different fit constants. The light scalar nonet is chosen because of a lack of other experimentally observed multiplets interpretable as pure exotic states. Since even the nonet contains only 3 particles with distinct masses (i. e. 3 fit points), the constituent quark masses had to be taken from conventional hadron fits obtained in our previous work. The two-constant model did not prove to be a viable alternative to the one-constant models. © 2019 Author(s).",
journal = "AIP Conference Proceedings",
title = "Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states",
volume = "2075",
pages = "080004",
doi = "10.1063/1.5091205"
}

Ignjatović, S. R., Borka Jovanović, V., Borka, D.,& Jovanović, P.. (2019). Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states. in AIP Conference Proceedings, 2075, 080004.
https://doi.org/10.1063/1.5091205

Ignjatović SR, Borka Jovanović V, Borka D, Jovanović P. Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states. in AIP Conference Proceedings. 2019;2075:080004.
doi:10.1063/1.5091205 .

Ignjatović, Siniša R., Borka Jovanović, Vesna, Borka, Duško, Jovanović, Predrag, "Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states" in AIP Conference Proceedings, 2075 (2019):080004,
https://doi.org/10.1063/1.5091205 . .

TY  - JOUR
AU  - Ignjatović, Siniša R.
AU  - Borka Jovanović, Vesna
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10286
AB  - There are several kinds of exotic hadron states. In this paper, we are concerned with the flavor exotic meson states: the tetraquarks and meson molecules. Two distinct models of tetraquarks are studied: diquark-antidiquark bound states and uncorrelated quarks. Although diquark is not a color singlet, there is a strong theoretical evidence that such states do exist within hadrons. Both tetraquark models as well as methods used to study such states are reviewed. The meson-meson molecules are also mentioned. It is remarked that hadron spectroscopy per se may not always be sufficient to discern between physically distinct models.
T2  - Facta Universitatis, Series: Physics, Chemistry and Technology
T1  - On some models of the exotic hadron states
VL  - 12
IS  - 2
SP  - 151
EP  - 158
DO  - 10.2298/FUPCT1402151I
ER  - 

@article{
author = "Ignjatović, Siniša R. and Borka Jovanović, Vesna",
year = "2014",
abstract = "There are several kinds of exotic hadron states. In this paper, we are concerned with the flavor exotic meson states: the tetraquarks and meson molecules. Two distinct models of tetraquarks are studied: diquark-antidiquark bound states and uncorrelated quarks. Although diquark is not a color singlet, there is a strong theoretical evidence that such states do exist within hadrons. Both tetraquark models as well as methods used to study such states are reviewed. The meson-meson molecules are also mentioned. It is remarked that hadron spectroscopy per se may not always be sufficient to discern between physically distinct models.",
journal = "Facta Universitatis, Series: Physics, Chemistry and Technology",
title = "On some models of the exotic hadron states",
volume = "12",
number = "2",
pages = "151-158",
doi = "10.2298/FUPCT1402151I"
}

Ignjatović, S. R.,& Borka Jovanović, V.. (2014). On some models of the exotic hadron states. in Facta Universitatis, Series: Physics, Chemistry and Technology, 12(2), 151-158.
https://doi.org/10.2298/FUPCT1402151I

Ignjatović SR, Borka Jovanović V. On some models of the exotic hadron states. in Facta Universitatis, Series: Physics, Chemistry and Technology. 2014;12(2):151-158.
doi:10.2298/FUPCT1402151I .

Ignjatović, Siniša R., Borka Jovanović, Vesna, "On some models of the exotic hadron states" in Facta Universitatis, Series: Physics, Chemistry and Technology, 12, no. 2 (2014):151-158,
https://doi.org/10.2298/FUPCT1402151I . .