Observation of Orbitally Excited (Formula presented) States

LHCb Collaboration

doi:10.1103/fc8j-tb8k

Observation of Orbitally Excited (Formula presented) States

LHCb Collaboration

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
Instituto Galego de Física de Altas Enerxías (IGFAE)
University of Bristol
Uppsala University
University of Glasgow
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
National Institute for Nuclear Physics
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
CERN
University of Manchester
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
University of A Coruna
Ramon Llull University
University of Milan - Bicocca
University of Chinese Academy of Sciences
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
CPPM
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
Laboratoire Leprince-Ringuet
University of Oxford
Heidelberg University
Pontifícia Universidade Católica do Rio de Janeiro
University of Edinburgh
AGH University of Krakow
CAS - Institute of High Energy Physics
Centro Brasileiro de Pesquisas Físicas
Kyiv National Taras Shevchenko University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
University of Bonn
Imperial College London
Université Savoie Mont Blanc
University of Modena and Reggio Emilia
University of Victoria BC
Los Alamos National Laboratory
Maastricht University
University of Ferrara
Monash University
Cracow University of Technology
Ohio State University
University of Padua
Tsinghua University
Wuhan University
University of Barcelona
Universidade Estadual de Campinas
University of Bologna
University of Genoa
University of Milan
Eötvös Loránd University
NASU - Institute of Nuclear Research
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Cincinnati
National Autonomous University of Honduras
Hunan University
Central China Normal University
University of Cagliari
University of Groningen
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
University of Bari
University College Dublin
South China Normal University
Rutherford Appleton Laboratory
University of Perugia
University of Valencia
University of Maryland, College Park
NASU - Kharkov Institute of Physics and Technology
University of Freiburg
National Centre for Nuclear Research
University of Pisa
RWTH Aachen University
Universidad Nacional de Colombia
University of Birmingham
Vrije Universiteit Amsterdam
Scuola Normale Superiore di Pisa
Henan Normal University
Lanzhou University
University of Bergamo
Ruhr University Bochum
Universidad de Ingeniería y Tecnología
University of Siena
Vilnius University
University of Basilicata
Max Planck Institute for Nuclear Physics
University of Alcalá
University of Urbino

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.

Original language	English
Article number	231902
Journal	Physical Review Letters
Volume	135
Issue number	23
DOIs	https://doi.org/10.1103/fc8j-tb8k
State	Published - 5 Dec 2025
Externally published	Yes

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10.1103/fc8j-tb8k

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@article{104862a4d8b24815b1a038a413a000e4,

title = "Observation of Orbitally Excited (Formula presented) States",

abstract = "The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.",

author = "\{LHCb Collaboration\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and Z. Aliouche and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and \{Andres Estrada\}, S. and A. Anelli and D. Ao and F. Archilli and Z. Areg and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2025 CERN, for the LHCb Collaboration.",

year = "2025",

month = dec,

day = "5",

doi = "10.1103/fc8j-tb8k",

language = "Ingl{\'e}s",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "23",

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TY - JOUR

T1 - Observation of Orbitally Excited (Formula presented) States

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Aliouche, Z.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andres Estrada, S.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

AU - Areg, Z.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Authier, J. A.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Calderon Ramirez, S.

PY - 2025/12/5

Y1 - 2025/12/5

N2 - The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.

AB - The observation of a wide peaking structure in the (Formula presented) mass spectrum is reported using proton-proton collision data collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of (Formula presented). The statistical significance over the background-only hypothesis exceeds seven standard deviations. The width of the observed structure is larger than the expectation from a single-peak hypothesis, and is well described by an effective minimal model consisting of two narrow peaks located at (Formula presented) and (Formula presented). The uncertainty terms are statistical, systematic, and associated to the knowledge of the (Formula presented) mass, respectively. The measured peak locations are in line with theoretical predictions for lowest excited (Formula presented)-wave (Formula presented) states, marking the first observation of orbitally excited beauty-charm mesons and providing important insights into the internal dynamics of hadrons containing two heavy quarks.

UR - https://www.scopus.com/pages/publications/105024949672

U2 - 10.1103/fc8j-tb8k

DO - 10.1103/fc8j-tb8k

M3 - Artículo

AN - SCOPUS:105024949672

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 23

M1 - 231902

ER -

Observation of Orbitally Excited (Formula presented) States

Abstract

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