Observation of structure in the J/ψ-pair mass spectrum
Using proton-proton collision data at centre-of-mass energies of √s = 7; 8 and 13 TeV recorded by the ffiffi LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb , the invariant mass spectrum of J/w pairs is studied. A narrow structure around 6:9 GeV=c mat...
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| Format: | Article |
| Language: | English |
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Elsevier BV
2022
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| Online Access: | https://hdl.handle.net/1721.1/142456 |
| _version_ | 1811072101804670976 |
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| author | Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Williams, Michael |
| author_sort | Williams, Michael |
| collection | MIT |
| description | Using proton-proton collision data at centre-of-mass energies of √s = 7; 8 and 13 TeV recorded by the ffiffi LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb , the invariant mass spectrum of J/w pairs is studied. A narrow structure around 6:9 GeV=c matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6:2 and 7:4 GeV=c , covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape. -1 2 2 |
| first_indexed | 2024-09-23T09:00:54Z |
| format | Article |
| id | mit-1721.1/142456 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:00:54Z |
| publishDate | 2022 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1424562023-04-19T19:22:14Z Observation of structure in the J/ψ-pair mass spectrum Williams, Michael Massachusetts Institute of Technology. Department of Physics Using proton-proton collision data at centre-of-mass energies of √s = 7; 8 and 13 TeV recorded by the ffiffi LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb , the invariant mass spectrum of J/w pairs is studied. A narrow structure around 6:9 GeV=c matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6:2 and 7:4 GeV=c , covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape. -1 2 2 2022-05-10T19:26:13Z 2022-05-10T19:26:13Z 2020-12-15 2022-05-10T19:21:48Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142456 Williams, Michael. 2020. "Observation of structure in the J/ψ-pair mass spectrum." Science Bulletin, 65 (23). en 10.1016/j.scib.2020.08.032 Science Bulletin Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0 application/pdf Elsevier BV Elsevier |
| spellingShingle | Williams, Michael Observation of structure in the J/ψ-pair mass spectrum |
| title | Observation of structure in the J/ψ-pair mass spectrum |
| title_full | Observation of structure in the J/ψ-pair mass spectrum |
| title_fullStr | Observation of structure in the J/ψ-pair mass spectrum |
| title_full_unstemmed | Observation of structure in the J/ψ-pair mass spectrum |
| title_short | Observation of structure in the J/ψ-pair mass spectrum |
| title_sort | observation of structure in the j ψ pair mass spectrum |
| url | https://hdl.handle.net/1721.1/142456 |
| work_keys_str_mv | AT williamsmichael observationofstructureinthejpspairmassspectrum |