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First observation of the B[bar]0s→ [Lambda]+c [Lambda][bar]−c decay and evidence for the B[bar]0 → [Lambda]+c [Lambda][bar]−c decay

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A search is presented for the two-body charmed baryonic decays, ¯𝐵0(𝑠)→Λ+𝑐⁢¯Λ−𝑐, using a data sample collected by the LHCb experiment during 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb−1. The first observation of the ¯𝐵0𝑠→Λ+𝑐⁢¯Λ−𝑐 decay is reported with 6.2⁢𝜎 significa...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Cocha Toapaxi, Carlos (Author) , Dittmann, Lucas (Author) , Glaser, Fabian (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Kolb, Ruben (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Ruiz Diaz, Miguel (Author) , Schiller, Manuel (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Wolf, Thomas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal) Editorial
Language:English
Published: 13 February, 2026
In: Physical review letters
Year: 2026, Volume: 136, Issue: 6, Pages: 1-14
ISSN:1079-7114
DOI:10.1103/cxn3-8t4g
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/cxn3-8t4g
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/cxn3-8t4g
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Author Notes:R. Aaij et al. (LHCb Collaboration*)
Description
Summary:A search is presented for the two-body charmed baryonic decays, ¯𝐵0(𝑠)→Λ+𝑐⁢¯Λ−𝑐, using a data sample collected by the LHCb experiment during 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb−1. The first observation of the ¯𝐵0𝑠→Λ+𝑐⁢¯Λ−𝑐 decay is reported with 6.2⁢𝜎 significance along with 4.3⁢𝜎 evidence for the ¯𝐵0→Λ+𝑐⁢¯Λ−𝑐 decay. The branching fractions are measured to be ℬ⁡(¯𝐵0→Λ+𝑐⁢¯Λ−𝑐)=(1.0⁢1+0.27−0.28±0.08±0.15)×10−5 and ℬ⁡(¯𝐵0𝑠→Λ+𝑐⁢¯Λ−𝑐)=(5.0±1.3±0.5±0.8)×10−5, where the first uncertainty is statistical, the second systematic, and the third due to external inputs. These results provide novel experimental inputs for the theoretical framework describing two-body baryonic decays of 𝐵 mesons via 𝑊-emission and 𝑊-exchange mechanisms.
Item Description:Veröffentlicht: 13. Februar 2026
Im Titel steht der Buchstabe B sowie das zweite Lambda mit einem Oberstrich
Im Titel sind die Plus- und Minuszeichen sowie die Zahl 0 hochgestellt
Im Titel ist der Buchstabe s und c tiefgestellt
*LHCb Collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, C. Cocha Toapaxi, L. Dittmann, F.C. Glaser, X. Han, S. Hansmann-Menzemer, P. Herrero Gascon, R. Kolb, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, M. Ruiz Diaz, M. Schiller, M.D. Tat, G. Tuci, L.H. Uecker, U. Uwer, C. Wang, T. Wolf, Y. Zhao, A. Zhelezov [und 1183 weitere Personen]
Gesehen am 20.04.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/cxn3-8t4g

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