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Measurement of the mass and full width of the ηc meson

  • Author(s): Bai, JZ
  • Ban, Y
  • Bian, JG
  • Blum, I
  • Chen, AD
  • Chen, GP
  • Chen, HF
  • Chen, HS
  • Chen, J
  • Chen, JC
  • Chen, XD
  • Chen, Y
  • Chen, YB
  • Cheng, BS
  • Choi, JB
  • Cui, XZ
  • Ding, HL
  • Dong, LY
  • Du, ZZ
  • Dunwoodie, W
  • Gao, CS
  • Gao, ML
  • Gao, SQ
  • Gratton, P
  • Gu, JH
  • Gu, SD
  • Gu, WX
  • Guo, YN
  • Guo, ZJ
  • 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
  • Huang, GS
  • Huang, XP
  • Huang, YZ
  • Izen, JM
  • Jiang, CH
  • Jin, Y
  • Jones, BD
  • Ju, X
  • Kang, JS
  • Ke, ZJ
  • Kelsey, MH
  • Kim, BK
  • Kim, HJ
  • Kim, SK
  • Kim, TY
  • Kong, D
  • Lai, YF
  • Lang, PF
  • Lankford, A
  • Li, CG
  • Li, D
  • Li, HB
  • Li, J
  • Li, JC
  • Li, PQ
  • Li, W
  • Li, WG
  • Li, XH
  • Li, XN
  • Li, XQ
  • Li, ZC
  • Liu, B
  • Liu, F
  • Liu, F
  • Liu, HM
  • Liu, J
  • Liu, JP
  • Liu, RG
  • Liu, Y
  • Liu, ZX
  • Lou, XC
  • Lowery, B
  • Lu, GR
  • Lu, F
  • Lu, JG
  • Luo, XL
  • Ma, EC
  • Ma, JM
  • Malchow, R
  • Mao, HS
  • Mao, ZP
  • Meng, XC
  • Mo, XH
  • Nie, J
  • Olsen, SL
  • Oyang, J
  • Paluselli, D
  • et al.
Abstract

In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ→γηc is observed for five different ηc decay channels: K+K-π+π-, π+π-π+π-, K±KS0π∓ (with KS0→π+π-), φφ (with φ→K+K-) and K+K-π0. From these signals, we determine the mass of ηc to be 2976.6±2.9 ±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γηc detected in the same spectrometer gives mηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γηc=11.0±8.1±4.1 MeV. ©2000 The American Physical Society.

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