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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

Batley J. R.;Culling A. J.;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.;Calvetti M.;Iacopini E.;Ruggiero G.;Bizzeti A.;Lenti M.;Veltri M.;Behler M.;Eppard K.;Kleinknecht K.;Marouelli P.;Masetti L.;Moosbrugger U.;Morales C. Morales;Renk B.;Wache M.;Wanke R.;Winhart A.;Coward D.;Dabrowski A.;Martin T. Fonseca;Shieh M.;Szleper M.;Velasco M.;Wood M. D.;Anzivino G.;Imbergamo E.;Nappi A.;Piccini M.;Raggi M.;Valdata Nappi M.;Cenci P.;Pepe M.;Petrucci M. C.;Cerri C.;Fantechi R.;Collazuol G.;DiLella L.;LAMANNA, GIANLUCA;Mannelli I.;Michetti A.;COSTANTINI, FLAVIO;Doble N.;Fiorini L.;GIUDICI, SERGIO;PIERAZZINI, GIUSEPPE;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.;Lopez S. Goy;Dibon H.;Jeitler M.;Markytan M.;Mikulec I.;Neuhofer G.;Widhalm L.

2009-01-01

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).

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	Anno
	
			2009
		
	Codice DOI
	
			https://dx.doi.org/10.1140/epjc/s10052-009-1171-3
		
	Tutti gli autori
	
			Batley, J. R.; Culling, A. J.; 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.; Calvetti, M.; Iacopini, E.; Ruggiero, G.; Bizzeti, A.; Lenti, M.; Veltri, M.; 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.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata Nappi, M.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Cerri, C.; Fantechi, R.; Collazuol, G.; Dilella, L.; Lamanna, Gianluca; Mannelli, I.; Michetti, A.; Costantini, Flavio; Doble, N.; Fiorini, L.; Giudici, Sergio; Pierazzini, Giuseppe; 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.; Lopez S., Goy; 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/11568/204609

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