Exploring fully heavy scalar tetraquarks QQQ‾Q‾
The masses, current couplings and widths of the fully heavy scalar tetraquarks X4Q=QQQ‾Q‾, Q=c,b are calculated by modeling them as four-quark systems composed of axial-vector diquark and antidiquark. The masses m(′) and couplings f(′) of these tetraquarks are computed in the context of the QCD sum...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323004239 |
| _version_ | 1797736875814813696 |
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| author | S.S. Agaev K. Azizi B. Barsbay H. Sundu |
| author_facet | S.S. Agaev K. Azizi B. Barsbay H. Sundu |
| author_sort | S.S. Agaev |
| collection | DOAJ |
| description | The masses, current couplings and widths of the fully heavy scalar tetraquarks X4Q=QQQ‾Q‾, Q=c,b are calculated by modeling them as four-quark systems composed of axial-vector diquark and antidiquark. The masses m(′) and couplings f(′) of these tetraquarks are computed in the context of the QCD sum rule method by taking into account a nonperturbative term proportional to the gluon condensate 〈αsG2/π〉. Results m=(6570±55)MeV and m′=(18540±50)MeV are used to fix kinematically allowed hidden-flavor decay channels of these states. It turns out that, the processes X4c→J/ψJ/ψ, X4c→ηcηc, and X4c→ηcχc1(1P) are possible decay modes of X4c. The partial widths of these channels are evaluated by means of the couplings gi,i=1,2,3 which describe strong interactions of tetraquark X4c and mesons at relevant vertices. The couplings gi are extracted from the QCD three-point sum rules by extrapolating corresponding form factors gi(Q2) to the mass-shell of a final meson. The mass of the scalar tetraquark X4b is below the ηbηb and ϒ(1S)ϒ(1S) thresholds, therefore it does not fall apart to these bottomonia, but transforms to conventional particles through other mechanisms. Comparing m=(6570±55)MeV and Γ4c=(110±21)MeV with parameters of structures observed by the LHCb, ATLAS and CMS collaborations, we interpret X4c as the resonance X(6600) reported by CMS. Comparisons are made with other theoretical predictions. |
| first_indexed | 2024-03-12T13:20:27Z |
| format | Article |
| id | doaj.art-6fe85a78bbcc4e34936330837387859f |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-12T13:20:27Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-6fe85a78bbcc4e34936330837387859f2023-08-26T04:42:33ZengElsevierPhysics Letters B0370-26932023-09-01844138089Exploring fully heavy scalar tetraquarks QQQ‾Q‾S.S. Agaev0K. Azizi1B. Barsbay2H. Sundu3Institute for Physical Problems, Baku State University, Az–1148 Baku, AzerbaijanDepartment of Physics, University of Tehran, North Karegar Avenue, Tehran 14395-547, Iran; Department of Physics, Doǧuş University, Dudullu-Ümraniye, 34775 Istanbul, Türkiye; Corresponding author.Division of Optometry, School of Medical Services and Techniques, Doǧu ş University, 34775 Istanbul, TürkiyeDepartment of Physics Engineering, Istanbul Medeniyet University, 34700 Istanbul, TürkiyeThe masses, current couplings and widths of the fully heavy scalar tetraquarks X4Q=QQQ‾Q‾, Q=c,b are calculated by modeling them as four-quark systems composed of axial-vector diquark and antidiquark. The masses m(′) and couplings f(′) of these tetraquarks are computed in the context of the QCD sum rule method by taking into account a nonperturbative term proportional to the gluon condensate 〈αsG2/π〉. Results m=(6570±55)MeV and m′=(18540±50)MeV are used to fix kinematically allowed hidden-flavor decay channels of these states. It turns out that, the processes X4c→J/ψJ/ψ, X4c→ηcηc, and X4c→ηcχc1(1P) are possible decay modes of X4c. The partial widths of these channels are evaluated by means of the couplings gi,i=1,2,3 which describe strong interactions of tetraquark X4c and mesons at relevant vertices. The couplings gi are extracted from the QCD three-point sum rules by extrapolating corresponding form factors gi(Q2) to the mass-shell of a final meson. The mass of the scalar tetraquark X4b is below the ηbηb and ϒ(1S)ϒ(1S) thresholds, therefore it does not fall apart to these bottomonia, but transforms to conventional particles through other mechanisms. Comparing m=(6570±55)MeV and Γ4c=(110±21)MeV with parameters of structures observed by the LHCb, ATLAS and CMS collaborations, we interpret X4c as the resonance X(6600) reported by CMS. Comparisons are made with other theoretical predictions.http://www.sciencedirect.com/science/article/pii/S0370269323004239 |
| spellingShingle | S.S. Agaev K. Azizi B. Barsbay H. Sundu Exploring fully heavy scalar tetraquarks QQQ‾Q‾ Physics Letters B |
| title | Exploring fully heavy scalar tetraquarks QQQ‾Q‾ |
| title_full | Exploring fully heavy scalar tetraquarks QQQ‾Q‾ |
| title_fullStr | Exploring fully heavy scalar tetraquarks QQQ‾Q‾ |
| title_full_unstemmed | Exploring fully heavy scalar tetraquarks QQQ‾Q‾ |
| title_short | Exploring fully heavy scalar tetraquarks QQQ‾Q‾ |
| title_sort | exploring fully heavy scalar tetraquarks qqq‾q‾ |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323004239 |
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