Interpretation of Yb(10750) as a tetraquark and its production mechanism
Recently, the Belle Collaboration has updated the analysis of the cross sections for the processes e+e−→ϒ(nS)π+π− (n=1,2,3) in the e+e− center-of-mass energy range from 10.52 to 11.02 GeV. A new structure, called here Yb(10750), with the mass M(Yb)=(10752.7±5.9−1.1+0.7) MeV and the Breit-Wigner widt...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-03-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269320300216 |
| _version_ | 1819212701412360192 |
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| author | Ahmed Ali Luciano Maiani Alexander Ya. Parkhomenko Wei Wang |
| author_facet | Ahmed Ali Luciano Maiani Alexander Ya. Parkhomenko Wei Wang |
| author_sort | Ahmed Ali |
| collection | DOAJ |
| description | Recently, the Belle Collaboration has updated the analysis of the cross sections for the processes e+e−→ϒ(nS)π+π− (n=1,2,3) in the e+e− center-of-mass energy range from 10.52 to 11.02 GeV. A new structure, called here Yb(10750), with the mass M(Yb)=(10752.7±5.9−1.1+0.7) MeV and the Breit-Wigner width Γ(Yb)=(35.5−11.3−3.3+17.6+3.9) MeV was observed [1]. We interpret Yb(10750) as a compact JPC=1−− state with a dominant tetraquark component. The mass eigenstate Yb(10750) is treated as a linear combination of the diquark-antidiquark and bb¯ components due to the mixing via gluonic exchanges shown recently to arise in the limit of large number of quark colors. The mixing angle between Yb and ϒ(5S) can be estimated from the electronic width, recently determined to be Γee(Yb)=(13.7±1.8) eV. The mixing provides a plausible mechanism for Yb(10750) production in high energy collisions from its bb¯ component and we work out the Drell-Yan and prompt production cross sections for pp→Yb(10750)→ϒ(nS)π+π− at the LHC. The resonant part of the dipion invariant mass spectrum in Yb(10750)→ϒ(1S)π+π− and the corresponding angular distribution of π+-meson in the dipion rest frame are presented as an example. |
| first_indexed | 2024-12-23T06:47:09Z |
| format | Article |
| id | doaj.art-63ecb249bc3b43139bc6f804c98efb0d |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-23T06:47:09Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-63ecb249bc3b43139bc6f804c98efb0d2022-12-21T17:56:32ZengElsevierPhysics Letters B0370-26932020-03-01802Interpretation of Yb(10750) as a tetraquark and its production mechanismAhmed Ali0Luciano Maiani1Alexander Ya. Parkhomenko2Wei Wang3Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg, Germany; Corresponding author.T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai, 200240, China; Dipartimento di Fisica and INFN, Sapienza Università di Roma, Piazzale Aldo Moro 2, I-00185 Roma, ItalyDepartment of Theoretical Physics, P.G. Demidov Yaroslavl State University, Sovietskaya 14, 150003 Yaroslavl, RussiaINPAC, SKLPPC, MOE KLPPC, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, ChinaRecently, the Belle Collaboration has updated the analysis of the cross sections for the processes e+e−→ϒ(nS)π+π− (n=1,2,3) in the e+e− center-of-mass energy range from 10.52 to 11.02 GeV. A new structure, called here Yb(10750), with the mass M(Yb)=(10752.7±5.9−1.1+0.7) MeV and the Breit-Wigner width Γ(Yb)=(35.5−11.3−3.3+17.6+3.9) MeV was observed [1]. We interpret Yb(10750) as a compact JPC=1−− state with a dominant tetraquark component. The mass eigenstate Yb(10750) is treated as a linear combination of the diquark-antidiquark and bb¯ components due to the mixing via gluonic exchanges shown recently to arise in the limit of large number of quark colors. The mixing angle between Yb and ϒ(5S) can be estimated from the electronic width, recently determined to be Γee(Yb)=(13.7±1.8) eV. The mixing provides a plausible mechanism for Yb(10750) production in high energy collisions from its bb¯ component and we work out the Drell-Yan and prompt production cross sections for pp→Yb(10750)→ϒ(nS)π+π− at the LHC. The resonant part of the dipion invariant mass spectrum in Yb(10750)→ϒ(1S)π+π− and the corresponding angular distribution of π+-meson in the dipion rest frame are presented as an example.http://www.sciencedirect.com/science/article/pii/S0370269320300216 |
| spellingShingle | Ahmed Ali Luciano Maiani Alexander Ya. Parkhomenko Wei Wang Interpretation of Yb(10750) as a tetraquark and its production mechanism Physics Letters B |
| title | Interpretation of Yb(10750) as a tetraquark and its production mechanism |
| title_full | Interpretation of Yb(10750) as a tetraquark and its production mechanism |
| title_fullStr | Interpretation of Yb(10750) as a tetraquark and its production mechanism |
| title_full_unstemmed | Interpretation of Yb(10750) as a tetraquark and its production mechanism |
| title_short | Interpretation of Yb(10750) as a tetraquark and its production mechanism |
| title_sort | interpretation of yb 10750 as a tetraquark and its production mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S0370269320300216 |
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