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Study of e+e-→pp̄ using initial state radiation with BABAR

  • Author(s): Aubert, B;
  • Barate, R;
  • Boutigny, D;
  • Couderc, F;
  • Karyotakis, Y;
  • Lees, JP;
  • Poireau, V;
  • Tisserand, V;
  • Zghiche, A;
  • Grauges, E;
  • Palano, A;
  • Pappagallo, M;
  • Pompili, A;
  • Chen, JC;
  • Qi, ND;
  • Rong, G;
  • Wang, P;
  • Zhu, YS;
  • Eigen, G;
  • Ofte, I;
  • Stugu, B;
  • Abrams, GS;
  • Battaglia, M;
  • Best, DS;
  • Brown, DN;
  • Button-Shafer, J;
  • Cahn, RN;
  • Charles, E;
  • Day, CT;
  • Gill, MS;
  • Gritsan, AV;
  • Groysman, Y;
  • Jacobsen, RG;
  • Kadel, RW;
  • Kadyk, JA;
  • Kerth, LT;
  • Kolomensky, YG;
  • Kukartsev, G;
  • Lynch, G;
  • Mir, LM;
  • Oddone, PJ;
  • Orimoto, TJ;
  • Pripstein, M;
  • Roe, NA;
  • Ronan, MT;
  • Wenzel, WA;
  • Barrett, M;
  • Ford, KE;
  • Harrison, TJ;
  • Hart, AJ;
  • Hawkes, CM;
  • Morgan, SE;
  • Watson, AT;
  • Fritsch, M;
  • Goetzen, K;
  • Held, T;
  • Koch, H;
  • Lewandowski, B;
  • Pelizaeus, M;
  • Peters, K;
  • Schroeder, T;
  • Steinke, M;
  • Boyd, JT;
  • Burke, JP;
  • Cottingham, WN;
  • Walker, D;
  • Cuhadar-Donszelmann, T;
  • Fulsom, BG;
  • Hearty, C;
  • Knecht, NS;
  • Mattison, TS;
  • McKenna, JA;
  • Khan, A;
  • Kyberd, P;
  • Saleem, M;
  • Teodorescu, L;
  • Blinov, AE;
  • Blinov, VE;
  • Bukin, AD;
  • Druzhinin, VP;
  • Golubev, VB;
  • Kravchenko, EA;
  • Onuchin, AP;
  • Serednyakov, SI;
  • Skovpen, YI;
  • Solodov, EP;
  • Yushkov, AN;
  • Bondioli, M;
  • Bruinsma, M;
  • Chao, M;
  • Curry, S;
  • Eschrich, I;
  • Kirkby, D;
  • Lankford, AJ;
  • Lund, P;
  • Mandelkern, M;
  • Mommsen, RK;
  • Roethel, W;
  • Stoker, DP;
  • Abachi, S
  • et al.
Abstract

The e+e-→pp̄ cross section is determined over a range of pp̄ masses, from threshold to 4.5GeV/c2, by studying the e+e-→pp̄γ process. The data set corresponds to an integrated luminosity of 232fb-1, collected with the BABAR detector at the PEP-II storage ring, at an e+e- center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |GE/GM|, is measured for pp̄ masses below 3GeV/c2; its value is found to be significantly larger than 1 for masses up to 2.2GeV/c2. We also measure J/ψ→pp̄ and ψ(2S)→pp̄ branching fractions and set an upper limit on Y(4260)→pp̄ production and decay. © 2006 The American Physical Society.

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