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Observation of a new charmed baryon decaying to Ξ c + π − π +

The Ξ+𝑐⁢𝜋−⁢𝜋+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measu...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Dittmann, Lucas (Author) , Esen, Sevda (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schmelling, Michael (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zavertyaev, Mikhail (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 14 October 2025
In: Physical review letters
Year: 2025, Volume: 135, Issue: 16, Pages: 1-14
ISSN:1079-7114
DOI:10.1103/gghl-m6fm
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/gghl-m6fm
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/gghl-m6fm
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Author Notes:LHCb Collaboration
Description
Summary:The Ξ+𝑐⁢𝜋−⁢𝜋+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be 𝑚⁡[Ξ𝑐⁢(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ⁡[Ξ𝑐⁢(2815)+]=2.07±0.08±0.12 MeV, 𝑚⁡[Ξ𝑐⁢(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ⁡[Ξ𝑐⁢(2923)+]=5.3±0.9±1.4 MeV, 𝑚⁡[Ξ𝑐⁢(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ⁡[Ξ𝑐⁢(2970)+]=31.7±1.7±1.9 MeV, 𝑚⁡[Ξ𝑐⁢(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ⁡[Ξ𝑐⁢(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξ+𝑐 mass, respectively. The Ξ𝑐⁢(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξ𝑐⁢(2923)0 state. Most of the measured parameters are more precise than existing world averages.
Item Description:Im Titel sind "+" und "-" hochgestellt und c ist tiefgestellt
The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, M. De Cian, L. Dittmann, S. Esen, F. Glaser, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M. Schmelling, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, M. Zavertyaev, Y. Zhao, A. Zhelezov und weitere 1128
Gesehen am 04.05.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/gghl-m6fm

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