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Measurement of the I=1 /2 Kπ S -wave amplitude from Dalitz plot analyses of ηc →k K ¯ π in two-photon interactions

  • Author(s): Lees, JP;
  • Poireau, V;
  • Tisserand, V;
  • Grauges, E;
  • Palano, A;
  • Eigen, G;
  • Brown, DN;
  • Kolomensky, YG;
  • Koch, H;
  • Schroeder, T;
  • Hearty, C;
  • Mattison, TS;
  • McKenna, JA;
  • So, RY;
  • Blinov, VE;
  • Buzykaev, AR;
  • Druzhinin, VP;
  • Golubev, VB;
  • Kravchenko, EA;
  • Onuchin, AP;
  • Serednyakov, SI;
  • Skovpen, YI;
  • Solodov, EP;
  • Todyshev, KY;
  • Lankford, AJ;
  • Gary, JW;
  • Long, O;
  • Eisner, AM;
  • Lockman, WS;
  • Panduro Vazquez, W;
  • Chao, DS;
  • Cheng, CH;
  • Echenard, B;
  • Flood, KT;
  • Hitlin, DG;
  • Kim, J;
  • Miyashita, TS;
  • Ongmongkolkul, P;
  • Porter, FC;
  • Röhrken, M;
  • Huard, Z;
  • Meadows, BT;
  • Pushpawela, BG;
  • Sokoloff, MD;
  • Sun, L;
  • Smith, JG;
  • Wagner, SR;
  • Bernard, D;
  • Verderi, M;
  • Bettoni, D;
  • Bozzi, C;
  • Calabrese, R;
  • Cibinetto, G;
  • Fioravanti, E;
  • Garzia, I;
  • Luppi, E;
  • Santoro, V;
  • Calcaterra, A;
  • De Sangro, R;
  • Finocchiaro, G;
  • Martellotti, S;
  • Patteri, P;
  • Peruzzi, IM;
  • Piccolo, M;
  • Zallo, A;
  • Passaggio, S;
  • Patrignani, C;
  • Bhuyan, B;
  • Mallik, U;
  • Chen, C;
  • Cochran, J;
  • Prell, S;
  • Ahmed, H;
  • Pennington, MR;
  • Gritsan, AV;
  • Arnaud, N;
  • Davier, M;
  • Le Diberder, F;
  • Lutz, AM;
  • Wormser, G;
  • Lange, DJ;
  • Wright, DM;
  • Coleman, JP;
  • Gabathuler, E;
  • Hutchcroft, DE;
  • Payne, DJ;
  • Touramanis, C;
  • Bevan, AJ;
  • Di Lodovico, F;
  • Sacco, R;
  • Cowan, G;
  • Banerjee, S;
  • Brown, DN;
  • Davis, CL;
  • Denig, AG;
  • Fritsch, M;
  • Gradl, W;
  • Griessinger, K;
  • Hafner, A;
  • Schubert, KR
  • et al.
Abstract

We study the processes γγ→KS0K±πℓ and γγ→K+K-π0 using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the Υ(nS) (n=2, 3, 4) resonances. We observe ηc decays to both final states and perform Dalitz plot analyses using a model-independent partial wave analysis technique. This allows a model-independent measurement of the mass-dependence of the I=1/2 Kπ S-wave amplitude and phase. A comparison between the present measurement and those from previous experiments indicates similar behavior for the phase up to a mass of 1.5 GeV/c2. In contrast, the amplitudes show very marked differences. The data require the presence of a new a0(1950) resonance with parameters m=1931±14±22 MeV/c2 and Γ=271±22±29 MeV.

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