Empirical parameterization of the K-+/- -> pi(+/-)pi(0)pi(0) decay Dalitz plot

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.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E.; Winston, R.; Rubin, P.; Walker, A.; Baldini, Wander; COTTA RAMUSINO, Angelo; Dalpiaz, Pietro; Damiani, Chiara; Fiorini, Massimiliano; Gianoli, Alberto; Martini, Mara; Petrucci, Ferruccio Carlo; Savrie, M.; Scarpa, Marcella; 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. M.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Martin, T. F.; 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, G.; Mannelli, I.; Michetti, A.; Costantini, F.; Doble, N.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.; Bloch Devaux, B.; Cheshkov, C.; Cheze, J. B.; Beer, M. D.; 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. G.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.

doi:10.1016/j.physletb.2010.02.036

As first observed by the NA48/2 experiment at the CERN SPS, the pi(0)pi(0) invariant mass (M-00) distribution from K-+/- -> pi(+/-)pi(0)pi(0) decay shows a cusp-like anomaly at M-00 = 2m(+), where m(+) is the charged pion mass An analysis to extract the pi pi scattering lengths in the isospin I = 0 and I = 2 states. a(0) and a(2), respectively, has been recently reported In the present work the Dahtz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K-+/- -> pi(+/-)pi(0)pi(0) decays (C) 2010 Elsevier B V All rights reserved