Determination of the S-wave p p scattering lengths from a study of K super(c)1p super(c) p super(0) p super(0) decays

• Published in: The European physical journal. C, Particles and fields Vol. 64; no. 4; pp. 589 - 608
• Main Authors: Batley, J R, Culling, A J, Kalmus, G, Munday, D J, Wotton, SA, Arcidiacono, R, Bocquet, G, Cabibbo, N, Ceccucci, A, Cundy, D, Gatignon, L, Kubischta, W, Norton, A, Maier, A, Patel, M, Peters, A, Balev, S, Frabetti, P L, Goudzovski, E, Kekelidze, V, Kozhuharov, V, Litov, L, Madigozhin, D, Marinova, E, Molokanova, N, Polenkevich, I, Potrebenikov, Yu, Stoynev, S, Zinchenko, A, Monnier, E, Swallow, E, Winston, R, Rubin, P, Walker, A, Baldini, W, Ramusino, ACotta, Dalpiaz, P, Damiani, C, 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, Marouelli, P, Masetti, L, Morales, CMorales, Renk, B, Wanke, R, Winhart, A, Coward, D, Dabrowski, A, Martin, TFonseca, Szleper, M, Velasco, M, Anzivino, G, Imbergamo, E, Nappi, A, Piccini, M, Raggi, M, Valdata-Nappi, M, Cenci, P, Pepe, M, Petrucci, M C, Fantechi, R, Collazuol, G, DiLella, L, Lamanna, G, Mannelli, I, Michetti, A, Costantini, F, Doble, N, Fiorini, L, Giudici, S, Pierazzini, G, Sozzi, M, Venditti, S, Bloch-Devaux, B, Derre, J, Marel, G, Mazzucato, E, Peyaud, B, Vallage, B, Biino, C, Cartiglia, N, Marchetto, F, Lopez, SGoy, Dibon, H, Jeitler, M, Markytan, M, Mikulec, I, Neuhofer, G, Widhalm, L
• Format: Journal Article
• Language: English
• Published: 01-12-2009
• Subjects: Anomalies; Charging; Decay; Formulations; Invariants; Pions; Scattering; Spark plasma sintering
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-009-1171-3

We report the results from a study of the full sample of 66.03110 super(7) K super(c)1p super(c) p super(0) p super(0) decays recorded by the NA48/2 experiment at the CERN SPS. As first observed in this experiment, the p super(0) p super(0) invariant mass (M sub(00)) distribution shows a cusp-like anomaly in the region around M sub(00)=2m sub(+), where m sub(+) is the charged pion mass. This anomaly has been interpreted as an effect due mainly to the final state charge exchange scattering process p super(+) p super(-)1p super(0) p super(0) in K super(c)1p super(c) p super(+) p super(-) decay. Fits to the M sub(00) distribution using two different theoretical formulations provide the presently most precise determination of a sub(0)-a sub(2), the difference between the p p S-wave scattering lengths in the isospin I=0 and I=2 states. Higher-order p p rescattering terms, included in the two formulations, allow also an independent, though less precise, determination of a sub(2).