X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps
The LHCb data on B+→J/ψϕK+ show four peaks and three dips in the J/ψϕ invariant mass distribution, and the peaks are interpreted as X(4140), X(4274), X(4500) and X(4685)/X(4700) resonance contributions. Interestingly, all the peaks and dips are located at (or close to) Ds⁎D¯s(⁎), Ds0⁎(2317)D¯s(⁎), D...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269322006207 |
| _version_ | 1798029166784806912 |
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| author | Satoshi X. Nakamura |
| author_facet | Satoshi X. Nakamura |
| author_sort | Satoshi X. Nakamura |
| collection | DOAJ |
| description | The LHCb data on B+→J/ψϕK+ show four peaks and three dips in the J/ψϕ invariant mass distribution, and the peaks are interpreted as X(4140), X(4274), X(4500) and X(4685)/X(4700) resonance contributions. Interestingly, all the peaks and dips are located at (or close to) Ds⁎D¯s(⁎), Ds0⁎(2317)D¯s(⁎), Ds1(2536)D¯s(⁎), and ψ′ϕ thresholds. These coincidences suggest a close connection between the structures and the thresholds, which however has not been seriously considered in previous theoretical studies on the X structures. In fact, if we utilize this connection and interpret the X structures as common s-wave threshold cusps, we face a difficulty: X(4274) and X(4500) have spin-parity that conflict with the experimentally determined ones. In this work, we introduce double triangle mechanisms that cause threshold cusps significantly sharper than the ordinary one-loop ones of the same spin-parity. We demonstrate that all the X and dip structures are well described by a combination of one-loop and double-triangle threshold cusps, thereby proposing a novel interpretation of the X and dip structures. |
| first_indexed | 2024-04-11T19:19:53Z |
| format | Article |
| id | doaj.art-68370083bba7467189b4ea3915590687 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-11T19:19:53Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-68370083bba7467189b4ea39155906872022-12-22T04:07:19ZengElsevierPhysics Letters B0370-26932022-11-01834137486X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cuspsSatoshi X. Nakamura0University of Science and Technology of China, Hefei 230026, People's Republic of China; State Key Laboratory of Particle Detection and Electronics (IHEP-USTC), Hefei 230036, People's Republic of China; Correspondence to: University of Science and Technology of China, Hefei 230026, People's Republic of China.The LHCb data on B+→J/ψϕK+ show four peaks and three dips in the J/ψϕ invariant mass distribution, and the peaks are interpreted as X(4140), X(4274), X(4500) and X(4685)/X(4700) resonance contributions. Interestingly, all the peaks and dips are located at (or close to) Ds⁎D¯s(⁎), Ds0⁎(2317)D¯s(⁎), Ds1(2536)D¯s(⁎), and ψ′ϕ thresholds. These coincidences suggest a close connection between the structures and the thresholds, which however has not been seriously considered in previous theoretical studies on the X structures. In fact, if we utilize this connection and interpret the X structures as common s-wave threshold cusps, we face a difficulty: X(4274) and X(4500) have spin-parity that conflict with the experimentally determined ones. In this work, we introduce double triangle mechanisms that cause threshold cusps significantly sharper than the ordinary one-loop ones of the same spin-parity. We demonstrate that all the X and dip structures are well described by a combination of one-loop and double-triangle threshold cusps, thereby proposing a novel interpretation of the X and dip structures.http://www.sciencedirect.com/science/article/pii/S0370269322006207 |
| spellingShingle | Satoshi X. Nakamura X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps Physics Letters B |
| title | X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps |
| title_full | X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps |
| title_fullStr | X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps |
| title_full_unstemmed | X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps |
| title_short | X structures in B+ → J/ψ ϕ K+ as one-loop and double-triangle threshold cusps |
| title_sort | x structures in b j ψ ϕ k as one loop and double triangle threshold cusps |
| url | http://www.sciencedirect.com/science/article/pii/S0370269322006207 |
| work_keys_str_mv | AT satoshixnakamura xstructuresinbjpsphkasoneloopanddoubletrianglethresholdcusps |