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Search for π 0 decays to invisible particles

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dc.contributor.authorCortina, G. E.
dc.contributor.authorKleimenova, A.
dc.contributor.authorMinucci, E.
dc.contributor.authorPadolski, S.
dc.contributor.authorKudenko, Y.
dc.contributor.authorКуденко, Юрий Григорьевич
dc.date.accessioned2024-11-29T12:07:58Z
dc.date.available2024-11-29T12:07:58Z
dc.date.issued2021
dc.description.abstract© 2021, The Author(s).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.
dc.identifier.citationSearch for π 0 decays to invisible particles / Cortina, Gil, E. [et al.] // Journal of High Energy Physics. - 2021. - 2021. - № 2. - 10.1007/JHEP02(2021)201
dc.identifier.doi10.1007/JHEP02(2021)201
dc.identifier.urihttps://www.doi.org/10.1007/JHEP02(2021)201
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85101791870&origin=resultslist
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/23744
dc.relation.ispartofJournal of High Energy Physics
dc.titleSearch for π 0 decays to invisible particles
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue2
oaire.citation.volume2021
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relation.isAuthorOfPublication.latestForDiscovery3751163c-7e93-4ea0-9549-f690efd6753e
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