Observation of the Very Rare ς+ →pμ+μ- Decay

LHCb Collaboration

doi:10.1103/r3v2-kmmp

Observation of the Very Rare ς+ →pμ+μ- Decay

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
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 Urbino
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
University of Oxford
Heidelberg University
Laboratoire Leprince-Ringuet
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
Ramon Llull University
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
Los Alamos National Laboratory
Maastricht University
Monash University
Cracow University of Technology
Ohio State University
University of Alcalá
University of Padua
Wuhan University
University of Ferrara
University of Barcelona
Facultad de Ciencias Fisicas
University of Bologna
University of Genoa
University of Milan
Tsinghua University
NASU - Institute of Nuclear Research
University of A Coruna
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Glasgow
University of Cincinnati
National Autonomous University of Honduras
Hunan University
University of Cagliari
University of Groningen
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
University of Bari
Central China Normal University
Eötvös Loránd University
University College Dublin
South China Normal University
Rutherford Appleton Laboratory
University of Perugia
University of Valencia
University of Maryland, College Park
University of Freiburg
University of Basilicata
National Centre for Nuclear Research
University of Pisa
RWTH Aachen University
Universidad Nacional de Colombia
University of Birmingham
NASU - Kharkov Institute of Physics and Technology
Vrije Universiteit Amsterdam
Scuola Normale Superiore di Pisa
Henan Normal University
Lanzhou University
University of Florence
University of Bergamo
Ruhr University Bochum
Universidad de Ingeniería y Tecnología
University of Siena
Vilnius University
Max Planck Institute for Nuclear Physics

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Resumen

The first observation of the ς+→pμ+μ- decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237±16 ς+→pμ+μ- decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08±0.17)×10-8 is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.

Idioma original	Inglés
Número de artículo	051801
Publicación	Physical Review Letters
Volumen	135
N.º	5
DOI	https://doi.org/10.1103/r3v2-kmmp
Estado	Publicada - 1 ago 2025
Publicado de forma externa	Sí

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@article{37b3d7f7764741e6871e3fb36f64616e,

title = "Observation of the Very Rare ς+ →pμ+μ- Decay",

abstract = "The first observation of the ς+→pμ+μ- decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237±16 ς+→pμ+μ- decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08±0.17)×10-8 is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.",

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 A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli 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 D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and A. Balboni and \{Calderon Ramirez\}, S.",

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

year = "2025",

month = aug,

day = "1",

doi = "10.1103/r3v2-kmmp",

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

volume = "135",

journal = "Physical Review Letters",

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T1 - Observation of the Very Rare ς+ →pμ+μ- Decay

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 - Andreianov, A.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andreou, D.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

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 - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Balboni, A.

AU - Calderon Ramirez, S.

PY - 2025/8/1

Y1 - 2025/8/1

N2 - The first observation of the ς+→pμ+μ- decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237±16 ς+→pμ+μ- decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08±0.17)×10-8 is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.

AB - The first observation of the ς+→pμ+μ- decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237±16 ς+→pμ+μ- decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08±0.17)×10-8 is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.

UR - https://www.scopus.com/pages/publications/105013688388

U2 - 10.1103/r3v2-kmmp

DO - 10.1103/r3v2-kmmp

M3 - Artículo

C2 - 40824789

AN - SCOPUS:105013688388

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 051801

ER -

Observation of the Very Rare ς+ →pμ+μ- Decay

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