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ψ(2S)→π+π-J/ψ decay distributions

  • Author(s): Bai, JZ;
  • Ban, Y;
  • Bian, JG;
  • Blum, I;
  • Chen, GP;
  • Chen, HF;
  • Chen, J;
  • Chen, JC;
  • Chen, Y;
  • Chen, YB;
  • Chen, YQ;
  • Cheng, BS;
  • Cui, XZ;
  • Ding, HL;
  • Dong, LY;
  • Du, ZZ;
  • Dunwoodie, W;
  • Gao, CS;
  • Gao, ML;
  • Gao, SQ;
  • Gratton, P;
  • Gu, JH;
  • Gu, SD;
  • Gu, WX;
  • Gu, YF;
  • Guo, ZJ;
  • Guo, YN;
  • Han, SW;
  • Han, Y;
  • Harris, FA;
  • He, J;
  • He, JT;
  • He, KL;
  • He, M;
  • Heng, YK;
  • Hitlin, DG;
  • Hu, GY;
  • Hu, HM;
  • Hu, JL;
  • Hu, QH;
  • Hu, T;
  • Hu, XQ;
  • Huang, GS;
  • Huang, YZ;
  • Izen, JM;
  • Jiang, CH;
  • Jin, Y;
  • Jones, BD;
  • Ju, X;
  • Ke, ZJ;
  • Kelsey, MH;
  • Kim, BK;
  • Kong, D;
  • Lai, YF;
  • Lang, PF;
  • Lankford, A;
  • Li, CG;
  • Li, D;
  • Li, HB;
  • Li, J;
  • Li, JC;
  • Li, PQ;
  • Li, RB;
  • Li, W;
  • Li, WG;
  • Li, XH;
  • Li, XN;
  • Liu, HM;
  • Liu, J;
  • Liu, RG;
  • Liu, Y;
  • Lou, XC;
  • Lowery, B;
  • Lu, F;
  • Lu, JG;
  • Luo, XL;
  • Ma, EC;
  • Ma, JM;
  • Malchow, R;
  • Mao, HS;
  • Mao, ZP;
  • Meng, XC;
  • Nie, J;
  • Olsen, SL;
  • Oyang, J;
  • Paluselli, D;
  • Pan, LJ;
  • Panetta, J;
  • Porter, F;
  • Qi, ND;
  • Qi, XR;
  • Qian, CD;
  • Qiu, JF;
  • Qu, YH;
  • Que, YK;
  • Rong, G;
  • Schernau, M;
  • Shao, YY;
  • Shen, BW;
  • Shen, DL
  • et al.
Abstract

Using a sample of 3.8 M ψ(2S) events accumulated with the BES detector, the process ψ(2S) →π+π-J/ψ is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D wave amplitude, as well as S wave. On the other hand, the J/ψ-(π+π-) relative angular momentum is consistent with being pure S wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter κ, predicts that D wave pions should be present. We determine κ=0.183 ±0.002±0.003 based on the joint mππ-cos θπ* distribution. The fraction of D wave amplitude as a function of mππ is found to decrease with increasing mππ, in agreement with the model. We have also fit the Mannel-Yan model, which is another model that allows D wave pions. ©2000 The American Physical Society.

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