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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221849
First observation of the Λ0 b → D+D−Λ decay
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The Λ 0 b → D+D−Λ decay is observed for the frst time using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.3 fb−1 . Using the B0 → D+D−K0 S decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be R = σΛ0 b σB0 × B(Λ0 b → D+D−Λ) B(B0 → D+D−K0 S ) = 0.179 ± 0.022 ± 0.014 , where the frst uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, B(B0 → D+D−K0 S ), and the cross-section ratio, σΛ0 b /σB0 , previously measured by LHCb are used to derive the branching fraction of the Λ 0 b → D+D−Λ decay B(Λ0 b → D+D−Λ) = (1.24 ± 0.15 ± 0.10 ± 0.28 ± 0.11) × 10−4 , where the third and fourth contributions are due to uncertainties of B(B0 → D+D−K0 S ) and σΛ0 b /σB0 , respectively. Inspection of the D+Λ and D+D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λ 0 b → D∗+D−Λ decay is also observed for the frst time as a partially reconstructed component in the D+D−Λ invariant mass spectrum.
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COMERMA MONTELLS, Albert, GARCIA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GIOVENTÙ, Alessandra, GIRONELLA GIRONELL, Pere, GOMEZ FERNANDEZ, Sergio, GRAUGÉS POUS, Eugeni, LOBO SALVIA, Aniol, LÓPEZ HUERTAS, Albert, MANERA ESCALERO, Rafel, MARIN BENITO, Carla, MAURICIO FERRE, Joan, CALEFICE, Lukas, VAZQUEZ GOMEZ, Ricardo, LHCb Collaboration. First observation of the Λ0 b → D+D−Λ decay. _Journal of High Energy Physics_. 2024. Vol. 2024, núm. 140. [consulta: 25 de febrer de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/221849]