Search for π 0 decays to invisible particles

The NA62 Collaboration

doi:10.1007/JHEP02(2021)201

Search for π ⁰ decays to invisible particles

The NA62 Collaboration

University of Louvain
LNF-INFN
European Organization for Nuclear Research
Brookhaven National Laboratory
Institute for Nuclear Research of the Russian Academy of Sciences
Comenius University
TRIUMF
University of British Columbia
University of California, Los Angeles
Charles University
Lund University
Johannes Gutenberg University
University of Würzburg
Universität Hamburg
Sezione INFN di Ferrara
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Modena and Reggio Emilia
Sofia University St. Kliment Ohridski
INFN Sezione di Napoli
University of Liverpool
INFN Sezione di Perugia
Institute of Meteorology and Climate Research
University of Birmingham
Goethe University Frankfurt am Main
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
University of Rome
Sezione di Roma
University of Rome “Tor Vergata”
INFN Sezione di Torino
Laboratory of Molecular Pathology
Universidad Autónoma de San Luis Potosi
Universidad de Guanajuato
Horia Hulubei National Institute of Physics and Nuclear Engineering
Joint Institute for Nuclear Research, Dubna
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
National Research Nuclear University MEPhI
Moscow Institute of Physics and Technology
Kurchatov Institute
c/o DESY
Imperial College London
Aix Marseille Université
University of Toronto
University of Warwick
Università di Roma La Sapienza
University of Bristol
University of Glasgow
Lancaster University
George Mason University
Stanford Linear Accelerator Center

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 10⁹ tagged π⁰ mesons from K⁺ → π⁺π⁰(γ), searching for the decay of the π⁰ to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10⁻⁹ is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K⁺ → π⁺X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c² and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

langue originale	Anglais
Numéro d'article	201
journal	Journal of High Energy Physics
Volume	2021
Numéro de publication	2
Les DOIs	https://doi.org/10.1007/JHEP02(2021)201
état	Publié - 1 févr. 2021

Accès au document

10.1007/JHEP02(2021)201

Autres fichiers et liens

Lien vers la publication dans Scopus

Contient cette citation

@article{66b94d73310a4d22ab15c02d72eccf5a,

title = "Search for π 0 decays to invisible particles",

abstract = "The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90\% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.",

keywords = "Beyond Standard Model, Exotics, Fixed target experiments, Rare decay",

author = "\{The NA62 Collaboration\} and \{Cortina Gil\}, E. and A. Kleimenova and E. Minucci and S. Padolski and P. Petrov and A. Shaikhiev and R. Volpe and T. Numao and B. Velghe and D. Bryman and J. Fu and T. Husek and J. Jerhot and K. Kampf and M. Zamkovsky and R. Aliberti and G. Khoriauli and J. Kunze and D. Lomidze and R. Marchevski and L. Peruzzo and M. Vormstein and R. Wanke and P. Dalpiaz and M. Fiorini and I. Neri and A. Norton and F. Petrucci and H. Wahl and \{Cotta Ramusino\}, A. and A. Gianoli and E. Iacopini and G. Latino and M. Lenti and A. Parenti and A. Bizzeti and F. Bucci and A. Antonelli and G. Georgiev and V. Kozhuharov and G. Lanfranchi and S. Martellotti and M. Moulson and T. Spadaro and F. Ambrosino and T. Capussela and M. Corvino and \{Di Filippo\}, D. and P. Massarotti and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s).",

year = "2021",

month = feb,

day = "1",

doi = "10.1007/JHEP02(2021)201",

language = "English",

volume = "2021",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

number = "2",

}

TY - JOUR

T1 - Search for π 0 decays to invisible particles

AU - The NA62 Collaboration

AU - Cortina Gil, E.

AU - Kleimenova, A.

AU - Minucci, E.

AU - Padolski, S.

AU - Petrov, P.

AU - Shaikhiev, A.

AU - Volpe, R.

AU - Numao, T.

AU - Velghe, B.

AU - Bryman, D.

AU - Fu, J.

AU - Husek, T.

AU - Jerhot, J.

AU - Kampf, K.

AU - Zamkovsky, M.

AU - Aliberti, R.

AU - Khoriauli, G.

AU - Kunze, J.

AU - Lomidze, D.

AU - Marchevski, R.

AU - Peruzzo, L.

AU - Vormstein, M.

AU - Wanke, R.

AU - Dalpiaz, P.

AU - Fiorini, M.

AU - Neri, I.

AU - Norton, A.

AU - Petrucci, F.

AU - Wahl, H.

AU - Cotta Ramusino, A.

AU - Gianoli, A.

AU - Iacopini, E.

AU - Latino, G.

AU - Lenti, M.

AU - Parenti, A.

AU - Bizzeti, A.

AU - Bucci, F.

AU - Antonelli, A.

AU - Georgiev, G.

AU - Kozhuharov, V.

AU - Lanfranchi, G.

AU - Martellotti, S.

AU - Moulson, M.

AU - Spadaro, T.

AU - Ambrosino, F.

AU - Capussela, T.

AU - Corvino, M.

AU - Di Filippo, D.

AU - Massarotti, P.

AU - Maurice, E.

PY - 2021/2/1

Y1 - 2021/2/1

N2 - The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

AB - The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.

KW - Beyond Standard Model

KW - Exotics

KW - Fixed target experiments

KW - Rare decay

UR - https://www.scopus.com/pages/publications/85101791870

U2 - 10.1007/JHEP02(2021)201

DO - 10.1007/JHEP02(2021)201

M3 - Article

AN - SCOPUS:85101791870

SN - 1126-6708

VL - 2021

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 2

M1 - 201