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Bevan, A.; Dosanjh, R. S.; Gershon, T. J.; Hay, B.; Kalmus, G. E.; Lazzeroni, C.; Munday, D. J.; Olaiya, E.; Parker, M. A.; White, T. O.; Wotton, S. A.; Barr, G.; Bocquet, G.; Ceccucci, A.; Cuhadar-Dnszelmann, T.; Cundy, D.; d'Agostini, G.; Doble, N.; Falaleev, V.; Gatignon, L.; Gonidec, A.; Gorini, B.; Govi, G.; Grafstrm, P.; Kubischta, O W; Lacourt, A.; Norton, A.; Palestini, S.; Panzer-Steindel, B.; Taureg, H.; Velasco, M.; Wahl, H.; Cheshkov, C.; Khristov, P. Z.; Kekelidze, V.; Litov, L.; Madigozhin, D. T.; Molokanova, N.; Potrebenikov, Yu; Stoynev, S.; Zinchenko, A.; Knowles, I.; Martin, V.; Sacco, R.; Walker, A.; Contalbrigo, M.; Dalpiaz, P.; Duclos, J.; Frabetti, P. L.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Bizzeti, A.; Calvetti, M.; Collazuol, G.; Graziani, G.; Iacopini, E.; Lenti, M.; Ruggiero, G.; Veltri, M.; Becker, H. G.; Eppard, K.; Eppard, M.; Fox, H.; Kalter, A.; Kleinknecht, K.; Koch, U.; Köpke, L.; Lopes da Silva, P.; Marouelli, O P; Pellmann, I.; Peters, A.; Renk, B.; Schmidt, S. A.; Schönharting, V.; Schué, Yu; Wanke, R.; Winhart, A.; Wittgen, M.; Chollet, J.C.; Fayard, L.; Iconomidou-Fayard, L.; Ocariz, J.; Unal, G.; Wingerter-Seez, Isabelle; Anzivino, G.; Cenci, P.; Imbergamo, E.; Lubrano, P.; Mestvirishvili, A.; Nappi, A.; Pepé, M.; Piccini, M.; Bertanza, L.; Carosi, R.; Casali, R.; Cerri, C.; Cirilli, M.; Costantini, F.
Physics letters. B, 2007, Volume: 647Journal Article
This paper reports on a new high precision measurement of the form factors of the K_{L}\to \pi^{\pm} \mu^{\mp} \nu_{\mu} decay. The data sample of about 2.3$\times 10^{6}$ events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, $\lambda^{'}_{+} = (20.5\pm 2.2_{stat} \pm 2.4_{syst})\times 10^{-3}$, and a quadratic, $\lambda^{''}_{+} = (2.6\pm 0.9_{stat} \pm 1.0_{syst})\times 10^{-3}$ 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 $\lambda_{0} = (9.5\pm 1.1_{stat} \pm 0.8_{syst})\times 10^{-3}$. Using a linear fit our results were: $\lambda_{+} = (26.7\pm 0.6_{stat} \pm 0.8_{syst} )\times 10^{-3}$ and, $\lambda_{0} = (11.7\pm 0.7_{stat} \pm 1.0_{syst})\times 10^{-3}$. A pole fit of the form factors yields: $m_V = (905 \pm 9_{stat} \pm 17_{syst})$ MeV/c$^2$ and $m_S = (1400 \pm 46_{stat} \pm 53_{syst})$ MeV/c$^2$.
