Observation of the Λ0b→χc1Λb0→χc1 (3872) pK− decay; Journal of High Energy Physics; Vol. 2019, iss. 9
| Parent link: | Journal of High Energy Physics Vol. 2019, iss. 9.— 2019.— [28, 19 p.] |
|---|---|
| Autor corporatiu: | , |
| Altres autors: | , , , , , , |
| Sumari: | Title screen Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b→χc1Λb0→χc1(3872)pK− with χc1(3872) → J/ψ π+π− is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872)Λ(1520). The branching fraction with respect to that of the Λ0bΛb0 → ψ(2S)pK− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+π− final state, is measured to be:β(Λ0b→χc1(3872)pK−)/β(Λ0b→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)/β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,β(Λb0→χc1(3872)pK−)β(Λb0→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,where the first uncertainty is statistical and the second is systematic. |
| Idioma: | anglès |
| Publicat: |
2019
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| Matèries: | |
| Accés en línia: | https://doi.org/10.1007/JHEP09(2019)028 |
| Format: | Electrònic Capítol de llibre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663413 |
MARC
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| 200 | 1 | |a Observation of the Λ0b→χc1Λb0→χc1 (3872) pK− decay |f R. Aaij, C. A. Beteta, B. Adeva [et al.] | |
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| 330 | |a Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b→χc1Λb0→χc1(3872)pK− with χc1(3872) → J/ψ π+π− is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872)Λ(1520). The branching fraction with respect to that of the Λ0bΛb0 → ψ(2S)pK− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+π− final state, is measured to be:β(Λ0b→χc1(3872)pK−)/β(Λ0b→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)/β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,β(Λb0→χc1(3872)pK−)β(Λb0→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,where the first uncertainty is statistical and the second is systematic. | ||
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| 463 | |t Vol. 2019, iss. 9 |v [28, 19 p.] |d 2019 | ||
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