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.

Measurement of K-mu 3(0) form factors

COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2007

Abstract

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.
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, Flavio; Fantechi, R; Giudici, Sergio; Mannelli, I; Pierazzini, G; Sozzi, MARCO STANISLAO; 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/182065
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