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± → π∓μ±μ± obtained from this sample is reported: B(K± → π∓μ±μ±) < 8.6 × 10−11 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 → π∓μ±) and B(K± → π±χ)B(χ → μ+μ−) as functions of the resonance mass and lifetime. These limits are in the 10−10 − 10−9 range for resonance lifetimes below 100 ps.
Searches for lepton number violation and resonances in the K± → ΠΜΜ decays at the NA48/2 experiment / Massri K.; Anzivino G.; Arcidiacono R.; Baldini W.; Balev S.; Batley J.R.; Behler M.; Bifani S.; Biino C.; Bizzeti A.; Bloch-Devaux B.; Bocquet G.; Cabibbo N.; Calvetti M.; Cartiglia N.; Ceccucci A.; Cenci P.; Cerri C.; Cheshkov C.; Cheze J.B.; Clemencic M.; Collazuol G.; Costantini F.; Cotta Ramusino A.; Coward D.; Cundy D.; Dabrowski A.; Dalpiaz P.; Damiani C.; de Beer M.; Derre J.; Dibon H.; DiLella L.; Doble N.; Eppard K.; Falaleev V.; Fantechi R.; Fidecaro M.; Fiorini L.; Fiorini M.; Fonseca Martin T.; Frabetti P.L.; Gatignon L.; Gersabeck E.; Gianoli A.; Giudici S.; Gonidec A.; Goudzovski E.; Goy Lopez S.; Holder M.; Hristov P.; Iacopini E.; Imbergamo E.; Jeitler M.; Kalmus G.; Kekelidze V.; Kleinknecht K.; Kozhuharov V.; Kubischta W.; Lamanna G.; Lazzeroni C.; Lenti M.; Litov L.; Madigozhin D.; Maier A.; Mannelli I.; Marchetto F.; Marel G.; Markytan M.; Marouelli P.; Martini M.; Masetti L.; Mazzucato E.; Michetti A.; Mikulec I.; Molokanova N.; Monnier E.; Moosbrugger U.; Morales Morales C.; Munday D.J.; Nappi A.; Neuhofer G.; Norton A.; Patel M.; Pepe M.; Peters A.; Petrucci F.; Petrucci M.C.; Peyaud B.; Piccini M.; Pierazzini G.; Polenkevich I.; Potrebenikov Yu.; Raggi M.; Renk B.; Rubin P.; Ruggiero G.; Savrie M.; Scarpa M.; Shieh M.; Slater M.W.; Sozzi M.; Stoynev S.; Swallow E.; Szleper M.; Valdata-Nappi M.; Vallage B.; Velasco M.; Veltri M.; Venditti S.; Wache M.; Wahl H.; Walker A.; Wanke R.; Widhalm L.; Winhart A.; Winston R.; Wood M.D.; Wotton S.A.; Zinchenko A.; Ziolkowski M.. - ELETTRONICO. - (2016), pp. 109-116. ( 51st Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2016 Aosta Valley, ita 2016).
Searches for lepton number violation and resonances in the K± → ΠΜΜ decays at the NA48/2 experiment
Calvetti M.
;Cerri C.;Collazuol G.;Fantechi R.;Iacopini E.
;Lenti M.
;Mannelli I.;Peters A.;Ruggiero G.
;
2016
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± → π∓μ±μ± obtained from this sample is reported: B(K± → π∓μ±μ±) < 8.6 × 10−11 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 → π∓μ±) and B(K± → π±χ)B(χ → μ+μ−) as functions of the resonance mass and lifetime. These limits are in the 10−10 − 10−9 range for resonance lifetimes below 100 ps.
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