Observation of the Λ0b→ J/ψΞ− K+ and Ξ0b → J/ψΞ−π+ decays

LHCb Collaboration; R. Aaij; A.S.W. Abdelmotteleb; C. Abellan Beteta; F. Abudinén; T. Ackernley; A. A. Adefisoye; B. Adeva; Kristof de Bruyn; Daniel Martinez Gomez; Mick Mulder; Ann-Kathrin Perrevoort; Andrej Sarnatskiy

doi:10.1140/epjc/s10052-025-14129-6

Observation of the Λ⁰_b→ J/ψΞ⁻ K⁺ and Ξ⁰_b → J/ψΞ⁻π⁺ decays

LHCb Collaboration
, R. Aaij
, A.S.W. Abdelmotteleb
, C. Abellan Beteta
, F. Abudinén
, T. Ackernley
, A. A. Adefisoye
, B. Adeva
, Kristof de Bruyn
, Daniel Martinez Gomez
, Mick Mulder
, Ann-Kathrin Perrevoort
, Andrej Sarnatskiy

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Abstract

The first observation of the Ξb0→J/ψΞ-π+ decay and the most precise measurement of the branching fraction of the Λb0→J/ψΞ-K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13\,TeV, corresponding to an integrated luminosity of 5.4\,fb-1. Using the Λb0→J/ψΛ and Ξb-→J/ψΞ- decays as normalisation channels, the ratios of branching fractions are measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

Original language	English
Article number	812
Number of pages	15
Journal	The European Physical Journal C
Volume	85
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-025-14129-6
Publication status	Published - Jul-2025

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LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., Adeva, B., de Bruyn, K., Martinez Gomez, D., Mulder, M., Perrevoort, A.-K., & Sarnatskiy, A. (2025). Observation of the Λ⁰_b→ J/ψΞ⁻ K⁺ and Ξ⁰_b → J/ψΞ⁻π⁺ decays. The European Physical Journal C, 85(7), Article 812. https://doi.org/10.1140/epjc/s10052-025-14129-6

@article{1c7f5f7bfe3745689c7635f5fb830b18,

title = "Observation of the Λ0b→ J/ψΞ− K+ and Ξ0b → J/ψΞ−π+ decays",

abstract = "The first observation of the Ξb0→J/ψΞ-π+ decay and the most precise measurement of the branching fraction of the Λb0→J/ψΞ-K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13\textbackslash{},TeV, corresponding to an integrated luminosity of 5.4\textbackslash{},fb-1. Using the Λb0→J/ψΛ and Ξb-→J/ψΞ- decays as normalisation channels, the ratios of branching fractions are measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic. ",

author = "\{LHCb Collaboration\} and R. Aaij and A.S.W. Abdelmotteleb and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and \{de Bruyn\}, Kristof and \{Martinez Gomez\}, Daniel and Mick Mulder and Ann-Kathrin Perrevoort and Andrej Sarnatskiy",

year = "2025",

month = jul,

doi = "10.1140/epjc/s10052-025-14129-6",

language = "English",

volume = "85",

journal = "The European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "7",

}

LHCb Collaboration, Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adefisoye, AA, Adeva, B, de Bruyn, K , Martinez Gomez, D , Mulder, M , Perrevoort, A-K & Sarnatskiy, A 2025, 'Observation of the Λ⁰_b→ J/ψΞ⁻ K⁺ and Ξ⁰_b → J/ψΞ⁻π⁺ decays', The European Physical Journal C, vol. 85, no. 7, 812. https://doi.org/10.1140/epjc/s10052-025-14129-6

TY - JOUR

T1 - Observation of the Λ0b→ J/ψΞ− K+ and Ξ0b → J/ψΞ−π+ decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abdelmotteleb, A.S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - de Bruyn, Kristof

AU - Martinez Gomez, Daniel

AU - Mulder, Mick

AU - Perrevoort, Ann-Kathrin

AU - Sarnatskiy, Andrej

PY - 2025/7

Y1 - 2025/7

N2 - The first observation of the Ξb0→J/ψΞ-π+ decay and the most precise measurement of the branching fraction of the Λb0→J/ψΞ-K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13\,TeV, corresponding to an integrated luminosity of 5.4\,fb-1. Using the Λb0→J/ψΛ and Ξb-→J/ψΞ- decays as normalisation channels, the ratios of branching fractions are measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

AB - The first observation of the Ξb0→J/ψΞ-π+ decay and the most precise measurement of the branching fraction of the Λb0→J/ψΞ-K+ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13\,TeV, corresponding to an integrated luminosity of 5.4\,fb-1. Using the Λb0→J/ψΛ and Ξb-→J/ψΞ- decays as normalisation channels, the ratios of branching fractions are measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

U2 - 10.1140/epjc/s10052-025-14129-6

DO - 10.1140/epjc/s10052-025-14129-6

M3 - Article

SN - 1434-6044

VL - 85

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 7

M1 - 812

ER -