The semileptonic decay of the neutral K meson, K-L(0) --> pi+/-e-/+upsilon (K-e3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q(2))), scalar (f(S)) and tensor (f(T)) interactions were measured. The linear slope of the vector form factor lambda(+) = 0.0284 � 0.0007 � 0.0013 and values for the ratios |f(S)/f(+)(0)| = 0.015(-0.010)(+0.007) � 0.012 and |f(T)/f(+)(0)| = 0.05(-0.04)(+0.03) � 0.03 were obtained. The values for f(S) and f(T) are consistent with zero. Assuming only vector-axial-vector couplings, lambda(+) = 0.0288 � 0.0004 � 0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859 � 18 MeV, consistent with the K*(892) mass. (C) 2004 Elsevier B.V. All rights reserved.

Measurement of K-e3(0) form factors RID A-4071-2012

COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2004-01-01

Abstract

The semileptonic decay of the neutral K meson, K-L(0) --> pi+/-e-/+upsilon (K-e3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q(2))), scalar (f(S)) and tensor (f(T)) interactions were measured. The linear slope of the vector form factor lambda(+) = 0.0284 � 0.0007 � 0.0013 and values for the ratios |f(S)/f(+)(0)| = 0.015(-0.010)(+0.007) � 0.012 and |f(T)/f(+)(0)| = 0.05(-0.04)(+0.03) � 0.03 were obtained. The values for f(S) and f(T) are consistent with zero. Assuming only vector-axial-vector couplings, lambda(+) = 0.0288 � 0.0004 � 0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859 � 18 MeV, consistent with the K*(892) mass. (C) 2004 Elsevier B.V. All rights reserved.
2004
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; Madigojine, 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; Martelli, F; 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, L; 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, M; 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; 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: https://hdl.handle.net/11568/90581
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