PreprintCC BY 4.0HAL
Observation of the doubly charmed baryon varOmega+cc
Abstract
A search for the doubly charmed baryon varOmega+cc in the varOmega0cπ+ decay channel is performed using proton-proton collision data corresponding to an integrated luminosity of 6.3fb−1, collected with the upgraded LHCb detector in 2024 at a center-of-mass energy of 13.6TeV. A peaking structure with a global significance of 8.7σ is observed in the varOmega0cπ+ mass spectrum, where the varOmega0c baryon is reconstructed in the pK-K-π+ final state. The structure is consistent with originating from a weakly decaying particle and is identified as the doubly charmed baryon varOmega+cc. Its mass is determined to be 3725.9 ± 1.0 (stat) ± 0.2 (syst) ± 0.4 (lifetime) ± 0.6 (ext) MeV/c2, where the third uncertainty arises from the dependence of the selection-induced bias on the unknown varOmega+cc lifetime, and the fourth is due to the uncertainties on the masses of the varOmega0c, varXi+c, and varXi++cc baryons.
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BibTeX
@misc{aaij2026observation,
title = {{Observation of the doubly charmed baryon $\varOmega^+_cc$}},
author = {Roel Aaij and Mohammed Abdelfatah and Ahmed Sameh Wagih Abdelmotteleb and Carlos Abellan Beteta and Fernando Jesus Abudinén and Thomas Ackernley and Ayomide Matthew Adefisoye and Bernardo Adeva and Marco Adinolfi and Patrik Harri Adlarson and Christina Agapopoulou and Christine Angela Aidala and Simon Akar and Kazuyoshi Akiba and Hussain Hassan A Al Saleh and Pietro Albicocco and Johannes Albrecht and Ramunas Aleksiejunas and Federico Alessio and Paula Alvarez Cartelle and Sandra Amato and Jake Lewis Amey and Yasmine Amhis and Zachariah Benjamin Amos and Liupan An and Lucio Anderlini and Pasquale Andreola and Mirco Andreotti and Sergio Andres Estrada and Alessia Anelli and Dong Ao and Carolina Arata and Flavio Archilli and Zaratsyan Areg and Matteo Argenton and Sergio Arguedas Cuendis and Lisa Arnone and Marina Artuso and Elie Aslanides and Rita Ataíde da Silva and Michele Atzeni and Benjamin Audurier and Juliette Authier and David Bacher and Irene Bachiller Perea and Sebastian Bachmann and Marie Bachmayer and John Back and Maoze Bai and Ziyu Bai and Vladislav Balagura and Anna Balboni and Wander Baldini and Zachary Baldwin and Luca Balzani and Haoran Bao and Juan Baptista de Souza Leite and Carlos Javier Barbero Pretel and Matteo Barbetti and Ivanildo Rui Barbosa},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21921},
eprint = {2609.21921},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05763134v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of the doubly charmed baryon varOmega^+_cc
AU - Roel Aaij
AU - Mohammed Abdelfatah
AU - Ahmed Sameh Wagih Abdelmotteleb
AU - Carlos Abellan Beteta
AU - Fernando Jesus Abudinén
AU - Thomas Ackernley
AU - Ayomide Matthew Adefisoye
AU - Bernardo Adeva
AU - Marco Adinolfi
AU - Patrik Harri Adlarson
AU - Christina Agapopoulou
AU - Christine Angela Aidala
AU - Simon Akar
AU - Kazuyoshi Akiba
AU - Hussain Hassan A Al Saleh
AU - Pietro Albicocco
AU - Johannes Albrecht
AU - Ramunas Aleksiejunas
AU - Federico Alessio
AU - Paula Alvarez Cartelle
AU - Sandra Amato
AU - Jake Lewis Amey
AU - Yasmine Amhis
AU - Zachariah Benjamin Amos
AU - Liupan An
AU - Lucio Anderlini
AU - Pasquale Andreola
AU - Mirco Andreotti
AU - Sergio Andres Estrada
AU - Alessia Anelli
AU - Dong Ao
AU - Carolina Arata
AU - Flavio Archilli
AU - Zaratsyan Areg
AU - Matteo Argenton
AU - Sergio Arguedas Cuendis
AU - Lisa Arnone
AU - Marina Artuso
AU - Elie Aslanides
AU - Rita Ataíde da Silva
AU - Michele Atzeni
AU - Benjamin Audurier
AU - Juliette Authier
AU - David Bacher
AU - Irene Bachiller Perea
AU - Sebastian Bachmann
AU - Marie Bachmayer
AU - John Back
AU - Maoze Bai
AU - Ziyu Bai
AU - Vladislav Balagura
AU - Anna Balboni
AU - Wander Baldini
AU - Zachary Baldwin
AU - Luca Balzani
AU - Haoran Bao
AU - Juan Baptista de Souza Leite
AU - Carlos Javier Barbero Pretel
AU - Matteo Barbetti
AU - Ivanildo Rui Barbosa
PY - 2026
DA - 2026/09/18
PB - HAL
DO - 10.48550/arxiv.2609.21921
UR - https://hal.science/hal-05763134v1
AB - A search for the doubly charmed baryon varOmega^+_cc in the varOmega^0_cπ^+ decay channel is performed using proton-proton collision data corresponding to an integrated luminosity of 6.3fb^−1, collected with the upgraded LHCb detector in 2024 at a center-of-mass energy of 13.6TeV. A peaking structure with a global significance of 8.7σ is observed in the varOmega^0_cπ^+ mass spectrum, where the varOmega^0_c baryon is reconstructed in the pK^-K^-π^+ final state. The structure is consistent with originating from a weakly decaying particle and is identified as the doubly charmed baryon varOmega^+_cc. Its mass is determined to be 3725.9 ± 1.0 (stat) ± 0.2 (syst) ± 0.4 (lifetime) ± 0.6 (ext) MeV/c^2, where the third uncertainty arises from the dependence of the selection-induced bias on the unknown varOmega^+_cc lifetime, and the fourth is due to the uncertainties on the masses of the varOmega^0_c, varXi^+_c, and varXi^++_cc baryons.
ER -