期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP02(2021)201
关键词
Beyond Standard Model; Exotics; Fixed target experiments; Rare decay
资金
- F.R.S. FNRS (Fonds de la Recherche Scientifique -FNRS), Belgium
- BMES (Ministry of Education, Youth and Science), Bulgaria
- NSERC (Natural Sciences and Engineering Research Council) [SAPPJ-2018-0017]
- MEYS (Ministry of Education, Youth and Sports), Czech Republic
- BMBF (Bundesministerium fur Bildung und Forschung) [05H12UM5]
- INFN (Istituto Nazionale di Fisica Nucleare), Italy
- MIUR (Ministero dell'Istruzione, dell'Universita e della Ricerca), Italy
- CONACyT (Consejo Nacional de Ciencia y Tecnologia), Mexico
- IFA (Institute of Atomic Physics) Romanian CERN-RO [1/16.03.2016]
- Nucleus Programme PN 19 06
- INR-RAS
- MESRF (Ministry of Education and Science of the Russian Federation), Russia
- MESRS (Ministry of Education, Science, Research and Sport), Slovakia
- NSF (National Science Foundation) [1506088, 1806430]
- ERC (European Research Council) [268062, 336581]
- Charles University Research Center [UNCE/SCI/013]
- Ministry of Education, Universities and Research (MIUR) [RBFR12JF2Z]
- (Project GAP), Italy
- Russian Foundation for Basic Research [18-32-00072, 18-32-00245]
- Russian Science Foundation [RSF 19-72-10096]
- Royal Society [UF100308, UF0758946]
- STFC [ST/J00412X/1, ST/M005798/1]
- ERC [268062, 336581, 802836]
- EU [701386, 842407, 893101]
- Marie Curie Actions (MSCA) [842407, 893101, 701386] Funding Source: Marie Curie Actions (MSCA)
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506088, 1806430] Funding Source: National Science Foundation
- STFC [ST/J00412X/1] Funding Source: UKRI
- Royal Society [UF100308, UF0758946] Funding Source: Royal Society
- European Research Council (ERC) [802836, 268062, 336581] Funding Source: European Research Council (ERC)
The NA62 experiment at the CERN SPS conducted a study on pi (0) mesons from K+ -> pi (+)pi (0)(gamma), setting an upper limit on the branching ratio for the decay process. No signal of pi (0) decay to invisible particles was observed, improving previous results by a factor of 60. This result can also be interpreted as an independent upper limit on the branching ratio for the decay K+ -> pi X+, where X is a particle escaping detection with specific characteristics.
The NA62 experiment at the CERN SPS reports a study of a sample of 4 x 10(9) tagged pi (0) mesons from K+ -> pi (+)pi (0)(gamma), searching for the decay of the pi (0) to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 x 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+ -> pi X+, where X is a particle escaping detection with mass in the range 0.110-0.155 GeV/c(2) 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.
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