Test of lepton flavour universality in K+→ℓ+ν decays C Lazzeroni , A Romano , A Ceccucci , H O Danielsson , V Falaleev , L Gatignon , S Goy Lopez , B Hallgren , A Maier , A Peters , M Piccini , P Riedler , M Dyulendarova , P L Frabetti , V Kekelidze , D Madigozhin , E Marinova , N Molokanova , S A Movchan , Yu Potrebenikov , S Shkarovskiy , A Zinchenko , P Rubin , W Baldini , A Cotta Ramusino , P F Dalpiaz , M Fiorini , A Gianoli , A J Norton , F Petrucci , M Savrie , H Wahl , A Bizzeti , F Bucci , E Iacopini , M Lenti , M Veltri , A Antonelli , M Moulson , M Raggi , T Spadaro , K Eppard , M Hitahochgesand , Konrad Kleinknecht , B Renk , R Wanke , A Winhart , Roland Winston , V N Bolotov , V A Duk , E Gushchin , F Ambrosino , D Di Filippo , P Massarotti , M Napolitano , V Palladino , G Saracino , G Anzivino , E Imbergamo , R Piandani , A Sergi , P Cenci , M Pepe , F Costantini , N Doble , S Giudici , G M Pierazzini , M Sozzi , S Venditti , S Balev , G Collazuol , L Dilella , S Gallorini , E Goudzovski , G Lamanna , I Mannelli , G Ruggiero , C Cerri , R Fantechi , V F Kurshetsov , V Obraztsov , I Popov , V K Semenov , O Yushchenko , G Dʼagostini , E Leonardi , Michael J Serra , P Valente , A Fucci , Andrea Salamon , B Blochdevaux , B Peyaud , Jurgen Engelfried , D H Coward , V Kozhuharov , L Litov , R Arcidiacono , S Bifani , C Biino , G Dellacasa , F Marchetto , T Numao , F Retiere Physics Letters B（2011）
摘要
Abstract A precision test of lepton flavour universality has been performed by measuring the ratio R K of kaon leptonic decay rates K + → e + ν and K + → μ + ν in a sample of 59 813 reconstructed K + → e + ν candidates with ( 8.71 ± 0.24 ) % background contamination. The result R K = ( 2.487 ± 0.013 ) × 10 − 5 is in agreement with the Standard Model expectation.
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关键词
Lepton universality, Leptonic kaon decay
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