PreprintCC BY 4.0HAL
Measurement of the Ωb- baryon lifetime
Abstract
The lifetime ratio rτ≡τΩb-/τΞb- between the Ωb- and Ξb- baryons is measured using a sample of pp collision data corresponding to an integrated luminosity of 6 fb−1 and collected by the LHCb experiment during LHC Run 2 (2015−2018). The ratio rτ is measured in two sets of decays modes, (Ωb-,Ξb-)→(Ωc0π-,Ξc0π-) and (Ωb-,Ξb-)→(J/ψΩ-, J/ψΞ-), with (Ωc0,Ξc0)→ pK-K-π+, (Ω-,Ξ-)→(Λ0 K-,Λ0π-), Λ0→ pπ- and J/ψ→μ+μ-. The measured rτ values are averaged and combined with Run 1 (2011−2012) measurements in the same decay modes to obtain rτ = 1.109±0.055±0.010. Multiplying by the known Ξb- lifetime results in the Ωb- lifetime τΩb- = 1.751±0.089±0.022 ps, where the uncertainties are statistical and systematic. This measurement improves on the precision of the Ωb- lifetime by about a factor of two over the previous world average. The value of rτ is in agreement with the most recent theoretical predictions from the heavy quark expansion framework.
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BibTeX
@misc{aaij2026measurement,
title = {{Measurement of the $Ω_b^-$ baryon lifetime}},
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 Antonio Augusto Alves 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 Ivanildo Rui Barbosa},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.25370},
eprint = {2609.25370},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05780364v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measurement of the Ω_b^- baryon lifetime
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 - Antonio Augusto Alves
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 - Ivanildo Rui Barbosa
PY - 2026
DA - 2026/09/21
PB - HAL
DO - 10.48550/arxiv.2609.25370
UR - https://hal.science/hal-05780364v1
AB - The lifetime ratio r_τ≡τ_Ω_b^-/τ_Ξ_b^- between the Ω_b^- and Ξ_b^- baryons is measured using a sample of pp collision data corresponding to an integrated luminosity of 6 fb^−1 and collected by the LHCb experiment during LHC Run 2 (2015−2018). The ratio r_τ is measured in two sets of decays modes, (Ω_b^-,Ξ_b^-)→(Ω_c^0π^-,Ξ_c^0π^-) and (Ω_b^-,Ξ_b^-)→(J/ψΩ^-, J/ψΞ^-), with (Ω_c^0,Ξ_c^0)→ pK^-K^-π^+, (Ω^-,Ξ^-)→(Λ^0 K^-,Λ^0π^-), Λ^0→ pπ^- and J/ψ→μ^+μ^-. The measured r_τ values are averaged and combined with Run 1 (2011−2012) measurements in the same decay modes to obtain r_τ = 1.109±0.055±0.010. Multiplying by the known Ξ_b^- lifetime results in the Ω_b^- lifetime τ_Ω_b^- = 1.751±0.089±0.022 ps, where the uncertainties are statistical and systematic. This measurement improves on the precision of the Ω_b^- lifetime by about a factor of two over the previous world average. The value of r_τ is in agreement with the most recent theoretical predictions from the heavy quark expansion framework.
ER -