Hyperfine interactions of constituent quarks and the mass spectrum of tetraquark states
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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 fi...t 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).
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AIP Conference Proceedings, 2019, 2075, 080004-Funding / projects:
- Gravitation and the large scale structure of the Universe (RS-176003)
- Ministry of Science and Technology of the Republic of Srpska [19/6-020/961-158/14]
DOI: 10.1063/1.5091205
ISBN: 9780735418035
ISSN: 0094-243X
WoS: 000472653800088
Scopus: 2-s2.0-85062831220
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http://aip.scitation.org/doi/abs/10.1063/1.5091205https://vinar.vin.bg.ac.rs/handle/123456789/8093
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VinčaTY - 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 . .