- Main
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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