The Linearσ-model and the Observed Enhancement in the Mass Spectrum of pp in J/ψ→γpp

LIU Xiang; ZENG Xiao-Qiang; DING Yi-Bing; LI Xue-Qian; SHENG Hong; SHEN Peng-Nian

Chinese Physics C> 2006, Vol. 30> Issue(1) : 1-12

The Linearσ-model and the Observed Enhancement in the Mass Spectrum of pp in J/ψ→γpp

Department of Physics,Nankai University,Tianjin 300071,China2 Institute of Theoretical Physics,CAS,Beijing 100080,China3 Department of Physics,Graduate University of the CAS,Beijing 100049,China4 Institute of High Energy Physics,CAS,Beijing 100049,China

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Abstract：
Provided the enhancement in the pp spectrum in radiative decay J/ψ→γpp observed by the BES collaboration is due to an existence of a pp molecular state, we calculate its binding energy and lifetime in the linear σ model. Concretely, we consider a possibility that the enhancement is due to a pp resonance which is in either S-wave or P-wave structure and compare our results with the data. Moreover, pp can annihilate at s-channel which is absent in deuteron, thus by studying the total width of the pp bound state, we may gain more information about the linear σ model and some concerned issues

References

[1]

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LIU Xiang, ZENG Xiao-Qiang, DING Yi-Bing, LI Xue-Qian, SHENG Hong and SHEN Peng-Nian. The Linearσ-model and the Observed Enhancement in the Mass Spectrum of pp in J/ψ→γpp[J]. Chinese Physics C, 2006, 30(1): 1-12.

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Received: 2005-06-20
Revised: 2005-08-09

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沈阳化工大学材料科学与工程学院沈阳 110142

The Linearσ-model and the Observed Enhancement in the Mass Spectrum of pp in J/ψ→γpp

Corresponding author: LI Xue-Qian,

Department of Physics,Nankai University,Tianjin 300071,China2 Institute of Theoretical Physics,CAS,Beijing 100080,China3 Department of Physics,Graduate University of the CAS,Beijing 100049,China4 Institute of High Energy Physics,CAS,Beijing 100049,China

Received Date: 2005-06-20

Accepted Date: 2005-08-09

Available Online: 2006-01-05

Abstract: Provided the enhancement in the pp spectrum in radiative decay J/ψ→γpp observed by the BES collaboration is due to an existence of a pp molecular state, we calculate its binding energy and lifetime in the linear σ model. Concretely, we consider a possibility that the enhancement is due to a pp resonance which is in either S-wave or P-wave structure and compare our results with the data. Moreover, pp can annihilate at s-channel which is absent in deuteron, thus by studying the total width of the pp bound state, we may gain more information about the linear σ model and some concerned issues

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The Linearσ-model and the Observed Enhancement in the Mass Spectrum of pp in J/ψ→γpp

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