We report results from the analysis of the K(+/-) -> pi(+)pi(-) C(+/-)nu (Ke4) decay by the NA48/ 2 collaboration at the CERN SPS, based on the total statistics of 1.13 million decays collected in 2003- 2004. The hadronic form factors in the S- and P- wave and their variation with energy are obtained. The phase difference between the S- and P- wave states of the pp system is accurately measured and allows a precise determination of a(0)(0) and a(2) (0), the I = 0 and I = 2 S- wave pi pi scattering lengths: a(0) (0) = 0.2220 +/- 0.0128 (stat) +/- 0.0050(syst) +/- 0.0037th, a(2) (0) = - 0.0432 +/- 0.0086(stat) +/- 0.0034(syst) +/- 0.0028th. Combination of this result with the other NA48/ 2 measurement obtained in the study of K +/- -> pi(0)pi(0) pi(+/-) decays brings an improved determination of a(0)(0) and the first precise experimental measurement of a(2) (0), providing a stringent test of Chiral Perturbation Theory predictions and lattice QCD calculations. Using constraints based on analyticity and chiral symmetry, even more precise values are obtained: a(0) (0) = 0.2196 +/- 0.0028(stat) +/- 0.0020(syst) and a(2) (0) =- 0.0444 +/- 0.0007(stat) +/- 0.0005(syst) +/- 0.0008(ChPT).

Precise tests of low energy QCD from K(e4) decay properties

LAMANNA, GIANLUCA;COSTANTINI, FLAVIO;GIUDICI, SERGIO;SOZZI, MARCO STANISLAO;
2010-01-01

Abstract

We report results from the analysis of the K(+/-) -> pi(+)pi(-) C(+/-)nu (Ke4) decay by the NA48/ 2 collaboration at the CERN SPS, based on the total statistics of 1.13 million decays collected in 2003- 2004. The hadronic form factors in the S- and P- wave and their variation with energy are obtained. The phase difference between the S- and P- wave states of the pp system is accurately measured and allows a precise determination of a(0)(0) and a(2) (0), the I = 0 and I = 2 S- wave pi pi scattering lengths: a(0) (0) = 0.2220 +/- 0.0128 (stat) +/- 0.0050(syst) +/- 0.0037th, a(2) (0) = - 0.0432 +/- 0.0086(stat) +/- 0.0034(syst) +/- 0.0028th. Combination of this result with the other NA48/ 2 measurement obtained in the study of K +/- -> pi(0)pi(0) pi(+/-) decays brings an improved determination of a(0)(0) and the first precise experimental measurement of a(2) (0), providing a stringent test of Chiral Perturbation Theory predictions and lattice QCD calculations. Using constraints based on analyticity and chiral symmetry, even more precise values are obtained: a(0) (0) = 0.2196 +/- 0.0028(stat) +/- 0.0020(syst) and a(2) (0) =- 0.0444 +/- 0.0007(stat) +/- 0.0005(syst) +/- 0.0008(ChPT).
2010
Batley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; Ceccucci, A.; Cundy, D.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Norton, A.; Maier, A.; Patel, M.; Peters, A.; Balev, S.; Frabetti, P. L.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Marinova, E.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Y. u.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E.; Winston, R.; Rubin, P.; Walker, A.; Baldini, W.; Ramusino A., Cotta; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrie, M.; Scarpa, M.; Wahl, H.; Bizzeti, A.; Lenti, M.; Veltri, M.; Calvetti, M.; Celeghini, E.; Iacopini, E.; Ruggiero, G.; Behler, M.; Eppard, K.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales, Morales C.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Martin T., Fonseca; Shieh, M.; Szleper, M.; Velasco, M.; Wood, M. D.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata Nappi, M.; Cerri, C.; Fantechi, R.; Collazuol, G.; Dilella, L.; Lamanna, Gianluca; Mannelli, I.; Michetti, A.; Costantini, Flavio; Doble, N.; Fiorini, L.; Giudici, Sergio; Pierazzini, G.; Sozzi, MARCO STANISLAO; Venditti, S.; Bloch Devaux, B.; Cheshkov, C.; Cheze, J. B.; De Beer, M.; Derre, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Biino, C.; Cartiglia, N.; Marchetto, F.; Bifani, S.; Clemencic, M.; Goy Lopez, S.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/183716
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