The Λb0 → D+ D− Λ decay is observed for the first 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− K0S decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be R = σ_Λb0/σ_B0 × B(Λb0 → D+ D− Λ)/B(B0 → D+ D− K0S) = 0.179 ± 0.022 ± 0.014, where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, B(B0 → D+ D− K0S), and the cross-section ratio, σ_Λb0/σ_B0, previously measured by LHCb are used to derive the branching fraction of the Λb0 → D+ D− Λ decay B(Λb0 → 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− K0S) and σ_Λb0/σ_B0, respectively. Inspection of the D+ Λ and D+ D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+ D− Λ decay is also observed for the first time as a partially reconstructed component in the D+ D− Λ invariant mass spectrum.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adams, J.A., et al. (2024). First observation of the Λb0 → D+ D− Λ decay. JOURNAL OF HIGH ENERGY PHYSICS, 2024(7), 0-21 [10.1007/jhep07(2024)140].

First observation of the Λb0 → D+ D− Λ decay

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

Abstract

The Λb0 → D+ D− Λ decay is observed for the first 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− K0S decay as a reference channel, the product of the relative production cross-section and decay branching fractions is measured to be R = σ_Λb0/σ_B0 × B(Λb0 → D+ D− Λ)/B(B0 → D+ D− K0S) = 0.179 ± 0.022 ± 0.014, where the first uncertainty is statistical and the second is systematic. The known branching fraction of the reference channel, B(B0 → D+ D− K0S), and the cross-section ratio, σ_Λb0/σ_B0, previously measured by LHCb are used to derive the branching fraction of the Λb0 → D+ D− Λ decay B(Λb0 → 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− K0S) and σ_Λb0/σ_B0, respectively. Inspection of the D+ Λ and D+ D− invariant-mass distributions suggests a rich presence of intermediate resonances in the decay. The Λb0 → D*+ D− Λ decay is also observed for the first time as a partially reconstructed component in the D+ D− Λ invariant mass spectrum.
2024
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adams, J.A., et al. (2024). First observation of the Λb0 → D+ D− Λ decay. JOURNAL OF HIGH ENERGY PHYSICS, 2024(7), 0-21 [10.1007/jhep07(2024)140].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adams, J. A.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1006011
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