We report the results from a study of the full sample of similar to 6.031 x 10(7) K-+/- -> pi(+/-)pi(0)pi(0) decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the pi(0)pi(0) invariant mass (M-00) distribution shows a cusp-like anomaly in the region around M-00 = 2m(+), where m(+) is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process pi(+)pi(-) -> pi(0)pi(0) in K-+/- -> pi(+/-)pi(+)pi(-) decay. Fits to the M-00 distribution using two different theoretical formulations provide the presently most precise determination of a(0) - a(2), the difference between the pi pi S-wave scattering lengths in the isospin I = 0 and I = 2 states. Higher-order pi pi rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a(2).

Determination of the S-wave pi pi scattering lengths from a study of K-+/- -> pi(+/-)pi(0)pi(0) decays

BALDINI, Wander;COTTA RAMUSINO, Angelo;DALPIAZ, Pietro;DAMIANI, Chiara;FIORINI, Massimiliano;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;SCARPA, MARCELLA;
2009

Abstract

We report the results from a study of the full sample of similar to 6.031 x 10(7) K-+/- -> pi(+/-)pi(0)pi(0) decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the pi(0)pi(0) invariant mass (M-00) distribution shows a cusp-like anomaly in the region around M-00 = 2m(+), where m(+) is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process pi(+)pi(-) -> pi(0)pi(0) in K-+/- -> pi(+/-)pi(+)pi(-) decay. Fits to the M-00 distribution using two different theoretical formulations provide the presently most precise determination of a(0) - a(2), the difference between the pi pi S-wave scattering lengths in the isospin I = 0 and I = 2 states. Higher-order pi pi rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a(2).
J. R., Batley; A. J., Culling; G., Kalmus; C., Lazzeroni; D. J., Munday; M. W., Slater; S. A., Wotton; R., Arcidiacono; G., Bocquet; N., Cabibbo; A., Ceccucci; D., Cundy; V., Falaleev; M., Fidecaro; L., Gatignon; A., Gonidec; W., Kubischta; A., Norton; A., Maier; M., Patel; A., Peters; S., Balev; P. L., Frabetti; E., Goudzovski; P., Hristov; V., Kekelidze; V., Kozhuharov; L., Litov; D., Madigozhin; E., Marinova; N., Molokanova; I., Polenkevich; Y., Potrebenikov; S., Stoynev; A., Zinchenko; E., Monnier; E., Swallow; R., Winston; P., Rubin; A., Walker; Baldini, Wander; COTTA RAMUSINO, Angelo; Dalpiaz, Pietro; Damiani, Chiara; Fiorini, Massimiliano; Gianoli, Alberto; Martini, Mara; Petrucci, Ferruccio Carlo; Savrie', Mauro; Scarpa, Marcella; H., Wahl; M., Calvetti; E., Iacopini; G., Ruggiero; A., Bizzeti; M., Lenti; M., Veltri; M., Behler; K., Eppard; K., Kleinknecht; P., Marouelli; L., Masetti; U., Moosbrugger; C. M., Morales; B., Renk; M., Wache; R., Wanke; A., Winhart; D., Coward; A., Dabrowski; T. F., Martin; M., Shieh; M., Szleper; M., Velasco; M. D., Wood; G., Anzivino; E., Imbergamo; A., Nappi; M., Piccini; M., Raggi; M., Valdata Nappi; P., Cenci; M., Pepe; M. C., Petrucci; C., Cerri; R., Fantechi; G., Collazuol; L., Dilella; G., Lamanna; I., Mannelli; A., Michetti; F., Costantini; N., Doble; L., Fiorini; S., Giudici; G., Pierazzini; M., Sozzi; S., Venditti; B., Bloch Devaux; C., Cheshkov; J. B., Cheze; M. D., Beer; J., Derre; G., Marel; E., Mazzucato; B., Peyaud; B., Vallage; M., Holder; M., Ziolkowski; C., Biino; N., Cartiglia; F., Marchetto; S., Bifani; M., Clemencic; S. G., Lopez; H., Dibon; M., Jeitler; M., Markytan; I., Mikulec; G., Neuhofer; L., Widhalm
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1395336
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