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. 2004 Sep 10;93(11):112002.
doi: 10.1103/PhysRevLett.93.112002. Epub 2004 Sep 10.

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

M Ablikim  1 , J Z Bai, Y Ban, J G Bian, X Cai, J F Chang, H F Chen, H S Chen, H X Chen, J C Chen, Jin Chen, Jun Chen, M L Chen, Y B Chen, S P Chi, Y P Chu, X Z Cui, H L Dai, Y S Dai, Z Y Deng, L Y Dong, S X Du, Z Z Du, J Fang, S S Fang, C D Fu, H Y Fu, C S Gao, Y N Gao, M Y Gong, W X Gong, S D Gu, Y N Guo, Y Q Guo, Z J Guo, F A Harris, K L He, M He, X He, Y K Heng, H M Hu, T Hu, G S Huang, L Huang, X P Huang, X B Ji, Q Y Jia, C H Jiang, X S Jiang, D P Jin, S Jin, Y Jin, Y F Lai, F Li, G Li, H H Li, J Li, J C Li, Q J Li, R B Li, R Y Li, S M Li, W G Li, X L Li, X Q Li, X S Li, Y F Liang, H B Liao, C X Liu, F Liu, Fang Liu, H M Liu, J B Liu, J P Liu, R G Liu, Z A Liu, Z X Liu, F Lu, G R Lu, J G Lu, C L Luo, X L Luo, F C Ma, J M Ma, L L Ma, Q M Ma, X Y Ma, Z P Mao, X H Mo, J Nie, Z D Nie, S L Olsen, H P Peng, N D Qi, C D Qian, H Qin, J F Qiu, Z Y Ren, G Rong, L Y Shan, L Shang, D L Shen, X Y Shen, H Y Sheng, F Shi, X Shi, H S Sun, S S Sun, Y Z Sun, Z J Sun, X Tang, N Tao, Y R Tian, G L Tong, G S Varner, D Y Wang, J X Wang, J Z Wang, K Wang, L Wang, L S Wang, M Wang, P Wang, P L Wang, S Z Wang, W F Wang, Y F Wang, Zhe Wang, Z Wang, Zheng Wang, Z Y Wang, C L Wei, D H Wei, N Wu, Y M Wu, X M Xia, X X Xie, B Xin, G F Xu, H Xu, Y Xu, S T Xue, M L Yan, F Yang, H X Yang, J Yang, S D Yang, Y X Yang, M Ye, M H Ye, Y X Ye, L H Yi, Z Y Yi, C S Yu, G W Yu, C Z Yuan, J M Yuan, Y Yuan, Q Yue, S L Zang, Yu Zeng, Y Zeng, B X Zhang, B Y Zhang, C C Zhang, D H Zhang, H Y Zhang, J Zhang, J Y Zhang, J W Zhang, L S Zhang, Q J Zhang, S Q Zhang, X M Zhang, X Y Zhang, Y J Zhang, Y Y Zhang, Yiyun Zhang, Z P Zhang, Z Q Zhang, D X Zhao, J B Zhao, J W Zhao, M G Zhao, P P Zhao, W R Zhao, X J Zhao, Y B Zhao, Z G Zhao, H Q Zheng, J P Zheng, L S Zheng, Z P Zheng, X C Zhong, B Q Zhou, G M Zhou, L Zhou, N F Zhou, K J Zhu, Q M Zhu, Y C Zhu, Y S Zhu, Yingchun Zhu, Z A Zhu, B A Zhuang, B S Zou; BES Collaboration
Affiliations

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

M Ablikim et al. Phys Rev Lett. .

Abstract

An enhancement near the m(p)+M(Lambda) mass threshold is observed in the combined pLambda and pLambda invariant-mass spectrum from J/psi-->pK(-)Lambda;+c.c. decays. It can be fit with an S-wave Breit-Wigner resonance with a mass m=2075+/-12(stat)+/-5(syst) MeV and a width of Gamma=90+/-35(stat)+/-9(syst) MeV; it can also be fit with a P-wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in psi(')-->pK(-)Lambda;+c.c. decays. The analysis is based on samples of 5.8x10(7)J/psi and 1.4x10(7)psi(') decays accumulated in the BES II detector at the Beijing Electron-Positron Collider.

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