This Letter reports on a new high precision measurement of the form factors of the K-L -> pi(+/-) mu(-/+) nu(mu) decay. The data sample of about 2.3 x 10(6) events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, lambda(+)' = (20.5 +/- 2.2(stat) +/- 2.4(syst)) x 10(-3), and a quadratic, lambda(+)''(2.6 +/- 0.9(stat) +/- 1.0(syst)) x 10(-3) term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be lambda(o) = (9.5 +/- 1.1(stat) +/- 0.8(syst)) x 10(-3). Using a linear fit our results were: lambda(+) = (26.7 +/- 0.6(stat) +/- 0.8(syst)) x 10(-3) and lambda(o) = (11.7 +/- 0.7(stat) +/- 1.0(syst)) x 10(-3). A pole fit of the form factors yields: M-V = (905 +/- 9(stat) +/- 17(syst)) MeV/c(2) and m(S) = (1400 +/- 46(stat) +/- 53(syst)) Mev/c(2). (c) 2007 Elsevier B.V. All rights reserved.
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Autori: | Lai A; Marras D; Bevan A; Dosanjh RS; Gershon TJ; Hay B; Kalmus GE; Lazzeroni C; Munday DJ; Olaiya E; Parker MA; White TO; Wotton SA; Barr G; Bocquet G; Ceccucci A; Cuhadar-Donszelmann T; Cundy D; D'Agostini G; Doble N; Falaleev V; Gatignon L; Gonidec A; Gorini B; Govi G; Grafstrom P; Kubischta W; Lacourt A; Norton A; Palestini S; Panzer-Steindel B; Taureg H; Velasco M; Wahl H; Cheshkov C; Hristov P; Kekelidze V; Litov L; Madigozhin D; Molokanova N; Potrebenikov Y; Stoynev S; Zinchenko A; Knowles I; Martin V; Sacco R; Walker A; Contalbrigo M; Dalpiaz P; Duclos J; Frabetti PL; Gianoli A; Martini M; Petrucci F; Savrie M; Bizzeti A; Calvetti M; Collazuol G; Graziani G; Iacopini E; Lenti M; Ruggiero G; Veltri M; Becker HG; Eppard K; Eppard M; Fox H; Kalter A; Kleinknecht K; Koch U; Kopke L; da Silva PL; Marouelli P; Pellmann I; Peters A; Renk B; Schmidt SA; Schonharting V; Schue Y; Wanke R; Winhart A; Wittgen M; Chollet JC; Fayard L; Iconomidou-Fayard I; Ocariz J; Unal G; Wingerter-Seez I; Anzivino G; Cenci P; Imbergamo E; Lubrano P; Mestvirishvili A; Nappi A; Pepe M; Piccini M; Bertanza L; Carosi R; Casali R; Cerri C; Cirilli A; Costantini F; Fantechi R; Giudici S; Mannelli I; Pierazzini G; Sozzi A; Cheze JB; Cogan J; De Beer M; Debu P; Formica A; de Cassagnac RG; Mazzucato E; Peyaud B; Turlay R; Vallage B; Bernhard R; Holder M; Maier A; Ziolkowski M; Arcidiacono R; Biino C; Cartiglia N; Marchetto F; Menichetti E; Pastrone N; Nassalski J; Rondio E; Szleper M; Wislicki W; Wronka S; Dibon H; Fischer G; Jeitler M; Markytan M; Mikulec I; Neuhofer G; Pernicka M; Taurok A; Widhalm L |
Titolo: | Measurement of K-mu 3(0) form factors |
Anno del prodotto: | 2007 |
Digital Object Identifier (DOI): | 10.1016/j.physletb.2007.02.039 |
Appare nelle tipologie: | 1.1 Articolo in rivista |