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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
  • Jiana, 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.
Creative Commons 'BY' version 4.0 license
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 θ*π 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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