Observation of a threshold enhancement in the pΛ invariant-mass spectrum


Journal Article

The threshold enhancement in the pλ̄ invariant- mass spectrum is discussed. The enhancement can be fit with an S-wave breit-wigner resonance with a mass m = 2075±12(stat) ±5(syst) MeV and a width ofγ =90±35(stat)±9(syst) MeV. The analysis was done on samples of 5.8 ×107 J/ψ and 1.4 × 107ψ′ decays accumulated in the BES II detector. The result show that S-wave and P-wave breit-wigner resonance functions can fit the enhancement.

Full Text

Duke Authors

Cited Authors

  • Ablikim, M; Bai, JZ; Ban, Y; Bian, JG; Cai, X; Chang, JF; Chen, HF; Chen, HS; Chen, HX; Chen, JC; Chen, J; Chen, ML; Chen, YB; Chi, SP; Chu, YP; Cui, XZ; Dai, HL; Dai, YS; Deng, ZY; Dong, LY; Du, SX; Du, ZZ; Fang, J; Fang, SS; Fu, CD; Fu, HY; Gao, CS; Gao, YN; Gong, MY; Gong, WX; Gu, SD; Guo, YN; Guo, YQ; Guo, ZJ; Harris, FA; He, KL; He, M; He, X; Heng, YK; Hu, HM; Hu, T; Huang, GS; Huang, L; Huang, XP; Ji, XB; Jia, QY; Jiang, CH; Jiang, XS; Jin, DP; Jin, S; Jin, Y; Lai, YF; Li, F; Li, G; Li, HH; Li, J; Li, JC; Li, QJ; Li, RB; Li, RY; Li, SM; Li, WG; Li, XL; Li, XQ; Li, XS; Liang, YF; Liao, HB; Liu, CX; Liu, F; Liu, HM; Liu, JB; Liu, JP; Liu, RG; Liu, ZA; Liu, ZX; Lu, F; Lu, GR; Lu, JG; Luo, CL; Luo, XL; Ma, FC; Ma, JM; Ma, LL; Ma, QM; Ma, XY; Mao, ZP; Mo, XH; Nie, J; Nie, ZD; Olsen, SL; Peng, HP; Qi, ND; Qian, CD; Qin, H; Qiu, JF; Ren, ZY; Rong, G; Shan, LY

Published Date

  • September 10, 2004

Published In

Volume / Issue

  • 93 / 11

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.93.112002

Citation Source

  • Scopus