期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP03(2021)058
关键词
Beyond Standard Model; Exotics; Fixed target experiments
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), Canada [SAPPJ-2018-0017]
- NRC (National Research Council), Canada
- MEYS (Ministry of Education, Youth and Sports), Czech Republic
- BMBF (Bundesministerium fur Bildung und Forschung), Germany [05H12UM5, 05H15UMCNA, 05H18UMCNA]
- 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, Romania [1/16.03.2016]
- INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences), Moscow, Russia
- JINR (Joint Institute for Nuclear Research), Dubna, Russia
- NRC (National Research Center) Kurchatov Institute, Russia
- MESRF (Ministry of Education and Science of the Russian Federation), Russia
- MESRS (Ministry of Education, Science, Research and Sport), Slovakia
- CERN (European Organization for Nuclear Research), Switzerland
- STFC (Science and Technology Facilities Council), United Kingdom
- NSF (National Science Foundation), U.S.A [1506088, 1806430]
- ERC (European Research Council), Europe [268062, 336581]
- Charles University Research Center, Czech Republic [UNCE/SCI/013]
- Ministry of Education, Universities and Research (MIUR), Italy [RBFR12JF2Z]
- Russian Foundation for Basic Research (RFBR), Russia [18-32-00072, 18-32-00245]
- Russian Science Foundation, Russia [RSF 19-72-10096]
- Royal Society, United Kingdom [UF100308, UF0758946]
- STFC, United Kingdom [ST/J00412X/1, ST/M005798/1]
- ERC [268062, 336581, 802836]
- EU Horizon 2020 (Marie Sklodowska-Curie grant [701386, 842407, 893101]
- IFA (Institute of Atomic Physics) Romanian Nucleus Programme, Romania [PN 19 06 01 04]
- European Research Council (ERC) [802836, 268062] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [893101, 842407, 701386] Funding Source: Marie Curie Actions (MSCA)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1806430] Funding Source: National Science Foundation
- STFC [ST/J00412X/1] Funding Source: UKRI
The search for K+ -> pi X+ decay with long-lived feebly interacting particles was conducted using data from the 2017 NA62 experiment at CERN. Limits were set on the branching ratio in two different X mass ranges, showing competitive results in the first range and significant improvements in the second range.
A search for the K+ -> pi X+ decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ -> pi+nu nu analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of X masses, 0-110 MeV/c(2) and 154-260 MeV/c(2), and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(K+ -> pi X+), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.
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