PreprintCC BY 4.0HAL
Discovery of an unexpectedly light and narrow beauty-strange state
Abstract
As the essential building blocks of visible matter, hadrons have traditionally been classified by the quark model as mesons composed of quark-antiquark pairs and baryons built from three valence quarks. Yet, this classical picture does not account for the intricate chiral dynamics of the strong force and the emergence of exotic multi-quark hadrons. While experimental evidence for such unconventional dynamics has surfaced in the charm sector, the open-beauty system remains the long-sought frontier for testing the universality of these mechanisms. Here the observation of a new resonance in the beauty-strange sector with a global significance exceeding seven standard deviations is reported using proton-proton collision data recorded by the Large Hadron Collider beauty (LHCb) experiment at the European Organization for Nuclear Research (CERN). It exhibits a narrow natural width and a substantial mass deficit compared to the conventional quark model predictions. This result marks the first observation of a nonconventional single-beauty hadron, providing crucial insights into the chiral dynamics of the strong interaction and heavy-quark spin symmetry in the exotic domain.
Related
- The new LHCb beauty-strange state as the bottom partner of the Ds0*(2317): a LQCD constrained coupled-channel chiral analysis
- Theoretical Review on Bulk Properties and Light/Strange Hadron Production in Heavy-Ion Collisions
- Experimental Review on Bulk Properties and Light/Strange Hadron Production in Heavy-Ion Collisions
- Exact flavor conservation at the quark level in causal clusters: strange particles, protons and light nuclei in small collision systems
- Constraining Light and Strange Flavor Equilibration in Relativistic Heavy-Ion Collisions
BibTeX
@misc{aaij2026discovery,
title = {{Discovery of an unexpectedly light and narrow beauty-strange state}},
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.2609.25178},
eprint = {2609.25178},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05780362v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Discovery of an unexpectedly light and narrow beauty-strange state
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 - 2026/09/21
PB - HAL
DO - 10.48550/arxiv.2609.25178
UR - https://hal.science/hal-05780362v1
AB - As the essential building blocks of visible matter, hadrons have traditionally been classified by the quark model as mesons composed of quark-antiquark pairs and baryons built from three valence quarks. Yet, this classical picture does not account for the intricate chiral dynamics of the strong force and the emergence of exotic multi-quark hadrons. While experimental evidence for such unconventional dynamics has surfaced in the charm sector, the open-beauty system remains the long-sought frontier for testing the universality of these mechanisms. Here the observation of a new resonance in the beauty-strange sector with a global significance exceeding seven standard deviations is reported using proton-proton collision data recorded by the Large Hadron Collider beauty (LHCb) experiment at the European Organization for Nuclear Research (CERN). It exhibits a narrow natural width and a substantial mass deficit compared to the conventional quark model predictions. This result marks the first observation of a nonconventional single-beauty hadron, providing crucial insights into the chiral dynamics of the strong interaction and heavy-quark spin symmetry in the exotic domain.
ER -