Observation of structure in the J/ψ-pair mass spectrum; Science Bulletin; Vol. 65, iss. 23
| Parent link: | Science Bulletin Vol. 65, iss. 23.— 2020.— [P. 1983-1993] |
|---|---|
| Autor corporatiu: | , |
| Altres autors: | , , , , , |
| Sumari: | Title screen Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb-1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c2 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 7.4GeV/c2, 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. |
| Idioma: | anglès |
| Publicat: |
2020
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| Matèries: | |
| Accés en línia: | http://earchive.tpu.ru/handle/11683/73240 https://doi.org/10.1016/j.scib.2020.08.032 |
| Format: | MixedMaterials Electrònic Capítol de llibre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666466 |
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| 200 | 1 | |a Observation of structure in the J/ψ-pair mass spectrum |f R. Aaij, C. A. Beteta, T. Ackernley [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
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| 330 | |a Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb-1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c2 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 7.4GeV/c2, 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. | ||
| 461 | |t Science Bulletin | ||
| 463 | |t Vol. 65, iss. 23 |v [P. 1983-1993] |d 2020 | ||
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