Observation of the Rare Decay of the η Meson to Four Muons

CMS Collaboration

doi:10.1103/PhysRevLett.131.091903

Observation of the Rare Decay of the η Meson to Four Muons

CMS Collaboration

A. Alikhanian Yerevan Institute of Physics
Yerevan State University
Austrian Academy of Sciences
Indian Institute of Technology Madras
TU Wien
University of Antwerp
Arab Academy for Science, Technology and Maritime Transport
Vrije Universiteit Brussel
Ghent University
Université libre de Bruxelles
Korea University
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Centro Brasileiro de Pesquisas Físicas
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Universidade Estadual Paulista Júlio de Mesquita Filho
Bulgarian Academy of Sciences
Sofia University St. Kliment Ohridski
Universidad de Tarapacá
Beihang University
Tsinghua University
Nanjing Normal University
University of Iowa
CAS - Institute of High Energy Physics
University of Chinese Academy of Sciences
University of Florida
Massachusetts Institute of Technology
Peking University
Sun Yat-Sen University
University of Science and Technology of China
CAS - Institute of Modern Physics
Rice University
Zhejiang University
Universidad de los Andes Colombia
Universidad de Antioquia
University of Split
Ruder Boskovic Institute
CERN
University of Cyprus
Charles University
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The British University in Egypt
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National Institute of Chemical Physics and Biophysics, Tallinn
Birla Institute of Technology, Mesra
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German Electron Synchrotron
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University College Dublin
National Institute for Nuclear Physics
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Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile
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Benemerita Universidad Autonoma de Puebla
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Wayne State University
Academy of Sciences of the Republic of Uzbekistan

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15 Citations (Scopus)

Abstract

A search for the rare Formula Presented double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of Formula Presented. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the Formula Presented decay as normalization, the branching fraction Formula Presented is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.

Original language	English
Article number	091903
Journal	Physical Review Letters
Volume	131
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.131.091903
Publication status	Published - 1 Sept 2023

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10.1103/PhysRevLett.131.091903

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@article{cbf6c4f2563d429fb398d722722f6b27,

title = "Observation of the Rare Decay of the η Meson to Four Muons",

abstract = "A search for the rare Formula Presented double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of Formula Presented. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the Formula Presented decay as normalization, the branching fraction Formula Presented is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.",

author = "\{CMS Collaboration\} and A. Hayrapetyan and A. Tumasyan and W. Adam and Andrejkovic, \{J. W.\} and T. Bergauer and S. Chatterjee and K. Damanakis and M. Dragicevic and \{Escalante Del Valle\}, A. and Hussain, \{P. S.\} and M. Jeitler and N. Krammer and D. Liko and I. Mikulec and J. Schieck and R. Sch{\"o}fbeck and D. Schwarz and M. Sonawane and S. Templ and W. Waltenberger and Wulz, \{C. E.\} and Darwish, \{M. R.\} and T. Janssen and \{Van Mechelen\}, P. and Bols, \{E. S.\} and J. D{\textquoteright}Hondt and S. Dansana and \{De Moor\}, A. and M. Delcourt and \{El Faham\}, H. and S. Lowette and I. Makarenko and A. Morton and D. M{\"u}ller and Sahasransu, \{A. R.\} and S. Tavernier and M. Tytgat and \{Van Putte\}, S. and D. Vannerom and B. Clerbaux and \{De Lentdecker\}, G. and L. Favart and D. Hohov and J. Jaramillo and A. Khalilzadeh and K. Lee and M. Mahdavikhorrami and A. Malara and S. Paredes and Strautnieks, \{N. R.\}",

note = "Publisher Copyright: {\textcopyright} 2023 CERN, for the CMS Collaboration.",

year = "2023",

month = sep,

day = "1",

doi = "10.1103/PhysRevLett.131.091903",

language = "English",

volume = "131",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

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TY - JOUR

T1 - Observation of the Rare Decay of the η Meson to Four Muons

AU - CMS Collaboration

AU - Hayrapetyan, A.

AU - Tumasyan, A.

AU - Adam, W.

AU - Andrejkovic, J. W.

AU - Bergauer, T.

AU - Chatterjee, S.

AU - Damanakis, K.

AU - Dragicevic, M.

AU - Escalante Del Valle, A.

AU - Hussain, P. S.

AU - Jeitler, M.

AU - Krammer, N.

AU - Liko, D.

AU - Mikulec, I.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Schwarz, D.

AU - Sonawane, M.

AU - Templ, S.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Darwish, M. R.

AU - Janssen, T.

AU - Van Mechelen, P.

AU - Bols, E. S.

AU - D’Hondt, J.

AU - Dansana, S.

AU - De Moor, A.

AU - Delcourt, M.

AU - El Faham, H.

AU - Lowette, S.

AU - Makarenko, I.

AU - Morton, A.

AU - Müller, D.

AU - Sahasransu, A. R.

AU - Tavernier, S.

AU - Tytgat, M.

AU - Van Putte, S.

AU - Vannerom, D.

AU - Clerbaux, B.

AU - De Lentdecker, G.

AU - Favart, L.

AU - Hohov, D.

AU - Jaramillo, J.

AU - Khalilzadeh, A.

AU - Lee, K.

AU - Mahdavikhorrami, M.

AU - Malara, A.

AU - Paredes, S.

AU - Strautnieks, N. R.

PY - 2023/9/1

Y1 - 2023/9/1

N2 - A search for the rare Formula Presented double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of Formula Presented. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the Formula Presented decay as normalization, the branching fraction Formula Presented is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.

AB - A search for the rare Formula Presented double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of Formula Presented. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the Formula Presented decay as normalization, the branching fraction Formula Presented is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.

UR - https://www.scopus.com/pages/publications/85171697132

U2 - 10.1103/PhysRevLett.131.091903

DO - 10.1103/PhysRevLett.131.091903

M3 - Article

C2 - 37721839

AN - SCOPUS:85171697132

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 091903

ER -

Observation of the Rare Decay of the η Meson to Four Muons

Abstract

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