Searches for lepton number violation and resonances in the K± → ΠΜΜ decays at the NA48/2 experiment

NA48/2 Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The NA48/2 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2003–2004. A new upper limit on the rate of the lepton number violating decay K± → πμ±μ± obtained from this sample is reported: B(K± → πμ±μ±) < 8.6 × 1011 at 90% CL. Searches for two-body resonances in the K± → πμμ decays (including heavy neutral leptons N4 and inflatons χ) in the accessible range of masses and lifetimes are also presented. In the absence of a signal, upper limits are set on the products of branching ratios B(K± → μ±N4)B(N4 → πμ±) and B(K± → π±χ)B(χ → μ+μ) as functions of the resonance mass and lifetime. These limits are in the 1010 − 109 range for resonance lifetimes below 100 ps.

Original languageEnglish (US)
Title of host publicationProceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016
EditorsEtienne Auge, Jacques Dumarchez, Jean Tron Thanh Van
PublisherARISF
Pages109-116
Number of pages8
ISBN (Electronic)9782954640099
StatePublished - 2016
Event51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016 - La Thuile, Italy
Duration: Mar 12 2016Mar 19 2016

Publication series

NameProceedings of the 51st Rencontres de Moriond - 2016 Electroweak Interactions and Unified Theories, EW 2016

Conference

Conference51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016
CountryItaly
CityLa Thuile
Period3/12/163/19/16

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Atomic and Molecular Physics, and Optics

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