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Measurement of $k^0 _{\mu 3}$ form factors (2006) |
- Lai, A,
- Marras, D,
- Bevan, A,
- Dosanjh, R S,
- Gershon, T J,
- Hay, B,
- Kalmus, George Ernest,
- Lazzeroni, C,
- Munday, D J,
- Olaiya, E,
- Parker, M A,
- White, T O,
- Wotton, S A,
- Barr, G,
- Bocquet, G,
- Ceccucci, A,
- Çuhadar-Dönszelmann, T,
- Cundy, Donald C,
- D'Agostini, G,
- Doble, Niels T,
- Falaleev, V,
- Gatignon, L,
- Gonidec, A,
- Gorini, B,
- Govi, G,
- Grafström, P,
- Kubischta, Werner,
- Lacourt, A,
- Norton, A,
- Palestini, S,
- Panzer-Steindel, B,
- Taureg, H,
- Velasco, M,
- Wahl, H,
- Cheshkov, C,
- Khristov, P Z,
- Kekelidze, V D,
- Litov, L,
- Madigozhin, D T,
- Molokanova, N A,
- Potrebenikov, Yu K,
- Stoynev, S,
- Zinchenko, A I,
- 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,
- Marouelli, 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, I,
- Anzivino, Giuseppina,
- 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,
- Fantechi, R,
- Giudici, S,
- Mannelli, I,
- Pierazzini, G M,
- Sozzi, M,
- Chèze, J B,
- Cogan, J,
- De Beer, M,
- Debu, P,
- Formica, A,
- Mazzucato, E,
- Peyaud, B,
- Turlay, René,
- Vallage, B
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Abstract |
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This paper reports on a new high precision measurement of the form factors of the $\rm K_{L}\rightarrow~\pi^{\pm}~\mu^{\mp}~\nu_{\mu}$} decay. The data sample of about 2.3X10^6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, $\lambda^{'}_{+} = (16.8\pm 2.3_{stat} \pm 2.4_{syst})\times 10^{-3}$, and a quadratic, $\lambda^{''}_{+} = (4.0\pm 1.0_{stat} \pm 1.0_{syst})\times 10^{-3}$ 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 $\lambda_{0} = (9.1\pm 1.1_{stat} \pm 0.8_{syst})\times 10^{-3}$. \noindent Using a linear fit our results were: $\lambda_{+} = (26.1\pm 0.6_{stat} \pm 0.8_{syst} )\times 10^{-3}$ and, $\lambda_{0} = (12.6\pm 0.7_{stat} \pm 1.0_{syst} )\times 10^{-3}$.\\ \noindent A pole fit of the form factors yields: $m_V = ( 915 \pm 10_{stat} \pm 17_{syst} )$ MeV/c$^2$ and $m_S = (1348 \pm 43_{stat} \pm 53_{syst} )$ MeV/c$^2$. |
Publication details |
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