New measurement of the K±→π+π−e±ν(Ke4) decay branching ratio and hadronic form factors

Na, J R Batley,G Kalmus,C Lazzeroni,D J Munday,M Slater,S A Wotton,R Arcidiacono,G Bocquet,Nicola Cabibbo,A Ceccucci,D Cundy,V Falaleev,M Fidecaro,L Gatignon, A Gonidec,W Kubischta,A Norton,A Maier, M Patel,A Peters,S Balev,P L Frabetti,E Gersabeck,E Goudzovski,P Hristov,V Kekelidze,V Kozhuharov,L Litov,D Madigozhin,N Molokanova,I Polenkevich,Yu Potrebenikov, S Stoynev, A Zinchenko, E Monnier, E C Swallow,Roland Winston,P Rubin,A Walker,W Baldini,A Cotta Ramusino,P F Dalpiaz,Chiara Damiani,M Fiorini,A Gianoli,M Martini,F Petrucci,M Savrie,Marco Scarpa,H Wahl,A Bizzeti,M Lenti,M Veltri,M Calvetti,E Iacopini,G Ruggiero,M Behler,K Eppard, K Kleinknecht,P Marouelli,L Masetti,U Moosbrugger,C Morales Morales,B Renk,M Wache,R Wanke,A Winhart, D H Coward,A Dabrowski,T Fonseca Martin,M Shieh,M Szleper,Mayda Velasco,Michael Wood,P Cenci,M Pepe,M C Petrucci,G Anzivino,E Imbergamo, A Nappi,M Piccini,M Raggi,M Valdatanappi,C Cerri,R Fantechi,G Collazuol,L Dilella,G Lamanna,I Mannelli,A Michetti,F Costantini,N Doble,L Fiorini,S Giudici,G M Pierazzini,M Sozzi,S Venditti,B Blochdevaux,C Cheshkov,J B Cheze,M De Beer,J Derre,G Marel, E Mazzucato,B Peyaud,B Vallage,M Holder,Michael Ziolkowski, C Biino,N Cartiglia,F Marchetto,S Bifani,M Clemencic,S Goy Lopez,H Dibon, M Jeitler,M Markytan, I Mikulec,G Neuhofer,L Widhalm

PHYSICS LETTERS B（2012）

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摘要

A sample of more than one million K-+/- -> pi(+)pi(-)e(+/-)v (K-e4) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003-2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of K-e4 gamma decays, is measured to be BR(K-e4) = (4.257 +/- 0.016(exp) +/- 0.031(ext)) x 10(-5) with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the pi pi scattering lengths conducted on the same data sample. The overall form factor normalization f(s) = 5.705 +/- 0.017(exp) +/- 0.031(ext) is obtained with a total relative precision of 0.6%. (c) 2012 Elsevier B.V. All rights reserved.

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关键词

Kaon rare decays,Branching ratio,Hadronic form factors,Semileptonic K-e4 decay

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