Precision measurement of the ratio of the charged kaon leptonic decay rates

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,P L Frabetti,E Gersabeck,V Kekelidze,D Madigozhin, M Misheva,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 Norton, F Petrucci,M Savrie,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,M Serra,P Valente, A Fucci,Andrea Salamon,B Blochdevaux,B Peyaud,J Engelfried, D H Coward,V Kozhuharov,Leander Litov,R Arcidiacono,S Bifani, C Biino,G Dellacasa,F Marchetto,T Numao,F Retiere

PHYSICS LETTERS B（2013）

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摘要

A precision measurement of the ratio R-K of the rates of kaon leptonic decays K-+/- -> e(+/-)v and K-+/- -> mu(+/-)v with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing similar to 150 000 reconstructed K-+/- -> e(+/-)v candidates with 11% background contamination, is R-K = (2.488 +/- 0.010) x 10(-5), in agreement with the Standard Model expectation. (c) 2013 Elsevier B.V. All rights reserved.

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