Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches
Aiming at self-consistent descriptions of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks) by means of QCD sum rules, we note that the totality of contributions to two-point or three-point correlation functions that involve, respectively, either two or just a single operator capable...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2022-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03004.pdf |
| _version_ | 1797951151398715392 |
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| author | Lucha Wolfgang Melikhov Dmitri Sazdjian Hagop |
| author_facet | Lucha Wolfgang Melikhov Dmitri Sazdjian Hagop |
| author_sort | Lucha Wolfgang |
| collection | DOAJ |
| description | Aiming at self-consistent descriptions of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks) by means of QCD sum rules, we note that the totality of contributions to two-point or three-point correlation functions that involve, respectively, either two or just a single operator capable of interpolating the particular multiquark under study can be straightforwardly disentangled into two disjoint classes defined by unambiguously identifiable members. The first is formed by so-called multiquark-phile contributions which indeed might support multiquarks. In the case of flavour-exotic tetraquarks, by definition composed of four (anti–) quarks of mutually different flavours, a tetraquark-phile contribution has to exhibit two or more gluon exchanges of appropriate topology. The second consists of contributions evidently not bearing any relation to multiquarks; these must be discarded when studying multiquarks by QCD sum rules. The first class only should enter the “multiquark-adequate” QCD sum rules for exotic hadrons. |
| first_indexed | 2024-04-10T22:26:08Z |
| format | Article |
| id | doaj.art-515ea2f1966b44ec8cf3bb6e1dcdc55a |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-10T22:26:08Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-515ea2f1966b44ec8cf3bb6e1dcdc55a2023-01-17T09:14:37ZengEDP SciencesEPJ Web of Conferences2100-014X2022-01-012740300410.1051/epjconf/202227403004epjconf_confxv2022_03004Zooming in on Multiquark Hadrons within QCD Sum-Rule ApproachesLucha Wolfgang0Melikhov Dmitri1Sazdjian Hagop2Institute for High Energy Physics, Austrian Academy of SciencesD. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State UniversityUniversité Paris-SaclayAiming at self-consistent descriptions of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks) by means of QCD sum rules, we note that the totality of contributions to two-point or three-point correlation functions that involve, respectively, either two or just a single operator capable of interpolating the particular multiquark under study can be straightforwardly disentangled into two disjoint classes defined by unambiguously identifiable members. The first is formed by so-called multiquark-phile contributions which indeed might support multiquarks. In the case of flavour-exotic tetraquarks, by definition composed of four (anti–) quarks of mutually different flavours, a tetraquark-phile contribution has to exhibit two or more gluon exchanges of appropriate topology. The second consists of contributions evidently not bearing any relation to multiquarks; these must be discarded when studying multiquarks by QCD sum rules. The first class only should enter the “multiquark-adequate” QCD sum rules for exotic hadrons.https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03004.pdf |
| spellingShingle | Lucha Wolfgang Melikhov Dmitri Sazdjian Hagop Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches EPJ Web of Conferences |
| title | Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches |
| title_full | Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches |
| title_fullStr | Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches |
| title_full_unstemmed | Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches |
| title_short | Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches |
| title_sort | zooming in on multiquark hadrons within qcd sum rule approaches |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2022/18/epjconf_confxv2022_03004.pdf |
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