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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185370
Observation of the decay B¯s0→χc2K+ K− in the ϕ mass region
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Studies of two-body b-hadron decays to final states containing a hidden charm meson such as a χcJ state (J = 0, 1, 2) provide powerful probes of the strong interaction. These decays proceed predominantly via a colour-suppressed b → ccs¯ transition. Theoretically, such decays are often studied in the factorization approach [1,2]. It is predicted, in the absence of final-state interactions, that decays to spin-0 and 2 charmonium states are highly suppressed compared to decays to spin-1 states [1]. Experimentally, factorization has been observed to hold for B+ → χc1,c2K+ decays,1 for which the Belle collaboration reported B(B+ → χc2K+)/B(B+ → χc1K+) = (2.25+0.73 −0.69 (stat) ± 0.17 (syst)) × 10−2 [3]. In other modes, less suppression is observed. For example, the LHCb collaboration has measured B(B0 → χc2K∗ (892)0 )/B(B0 → χc1K∗ (892)0 ) = (17.1 ± 5.0 (stat) ± 1.7 (syst) ± 1.1 (B)) × 10−2 [4], where the third uncertainty is due to the knowledge of external branching fractions, and the Belle collaboration has measured B(B+ → χc2K+π +π −)/B(B+ → χc1K+π +π −) = 0.36 ± 0.05 [5], where the total uncertainty is quoted. Even more strikingly, the LHCb collaboration reported [6] B(Λ 0 b → χc2pK−)/B(Λ 0 b → χc1pK−) = 1.02 ± 0.10 (stat) ± 0.02 (syst) ± 0.05 (B). These observations are difficult to reconcile with the factorization hypothesis. It is thus interesting to probe this ratio with other exclusive decay modes.
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ALFONSO ALBERO, Alejandro, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, LHCb Collaboration. Observation of the decay B¯s0→χc2K+ K− in the ϕ mass region. _Journal of High Energy Physics_. 2018. Vol. 2018, núm. 8, pàgs. 1-20. [consulta: 22 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185370]