Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model
The recently discovered Tcc+ is evaluated as a DD⁎ molecular structure in the JP=1+ sector. A coupled-channels calculation in charged basis, considering the D0D⁎+, D+D⁎0 and D⁎0D⁎+ channels, is done in the framework of a constituent quark model that successfully described other molecular candidates...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323002526 |
| _version_ | 1827942711634690048 |
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| author | P.G. Ortega J. Segovia D.R. Entem F. Fernández |
| author_facet | P.G. Ortega J. Segovia D.R. Entem F. Fernández |
| author_sort | P.G. Ortega |
| collection | DOAJ |
| description | The recently discovered Tcc+ is evaluated as a DD⁎ molecular structure in the JP=1+ sector. A coupled-channels calculation in charged basis, considering the D0D⁎+, D+D⁎0 and D⁎0D⁎+ channels, is done in the framework of a constituent quark model that successfully described other molecular candidates in the charmonium spectrum such as the X(3872). The Tcc+ is found as a D0D⁎+ molecule (87%) with a binding energy of 387 keV/c2 and a width of 81 keV, in agreement with the experimental measurements. The quark content of the state forces the inclusion of exchange diagrams to treat indistinguishable quarks between the D mesons, which are found to be essential to bind the molecule. The D0D0π+ line shape, scattering lengths and effective ranges of the molecule are also analyzed, which are found to be in agreement with the LHCb analysis. We search for further partners of the Tcc+ in other charm and bottom sectors, finding different candidates. In particular, in the charm sector we find a shallow JP=1+ D+D⁎0 molecule (83%), dubbed Tcc′, just 1.8 MeV above the Tcc+ state. In the bottom sector, we find an isoscalar and an isovector JP=1+ bottom partners, as BB⁎ molecules lying 21.9 MeV/c2 (I=0) and 10.5 MeV/c2 (I=1), respectively, below the B0B⁎+ threshold. |
| first_indexed | 2024-03-13T10:03:18Z |
| format | Article |
| id | doaj.art-8be79b7eac5e4ac2abcc9982e07825b1 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-13T10:03:18Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-8be79b7eac5e4ac2abcc9982e07825b12023-05-23T04:20:45ZengElsevierPhysics Letters B0370-26932023-06-01841137918Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark modelP.G. Ortega0J. Segovia1D.R. Entem2F. Fernández3Departamento de Física Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain; Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, E-37008 Salamanca, Spain; Corresponding author.Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, E-41013 Sevilla, SpainDepartamento de Física Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain; Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, E-37008 Salamanca, SpainInstituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, E-37008 Salamanca, SpainThe recently discovered Tcc+ is evaluated as a DD⁎ molecular structure in the JP=1+ sector. A coupled-channels calculation in charged basis, considering the D0D⁎+, D+D⁎0 and D⁎0D⁎+ channels, is done in the framework of a constituent quark model that successfully described other molecular candidates in the charmonium spectrum such as the X(3872). The Tcc+ is found as a D0D⁎+ molecule (87%) with a binding energy of 387 keV/c2 and a width of 81 keV, in agreement with the experimental measurements. The quark content of the state forces the inclusion of exchange diagrams to treat indistinguishable quarks between the D mesons, which are found to be essential to bind the molecule. The D0D0π+ line shape, scattering lengths and effective ranges of the molecule are also analyzed, which are found to be in agreement with the LHCb analysis. We search for further partners of the Tcc+ in other charm and bottom sectors, finding different candidates. In particular, in the charm sector we find a shallow JP=1+ D+D⁎0 molecule (83%), dubbed Tcc′, just 1.8 MeV above the Tcc+ state. In the bottom sector, we find an isoscalar and an isovector JP=1+ bottom partners, as BB⁎ molecules lying 21.9 MeV/c2 (I=0) and 10.5 MeV/c2 (I=1), respectively, below the B0B⁎+ threshold.http://www.sciencedirect.com/science/article/pii/S0370269323002526Potential modelsQuark modelsCoupled-channels calculation |
| spellingShingle | P.G. Ortega J. Segovia D.R. Entem F. Fernández Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model Physics Letters B Potential models Quark models Coupled-channels calculation |
| title | Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model |
| title_full | Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model |
| title_fullStr | Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model |
| title_full_unstemmed | Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model |
| title_short | Nature of the doubly-charmed tetraquark Tcc+ in a constituent quark model |
| title_sort | nature of the doubly charmed tetraquark tcc in a constituent quark model |
| topic | Potential models Quark models Coupled-channels calculation |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323002526 |
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