Paper Code |
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Title |
Vector mesons and electromagnetic form factor of the Lambda hyperon |
Authors |
Cao, Xu; Dai, Jiang-Ping; Xie, Ya-Ping |
Corresponding Author |
Dai, JP (reprint author) |
Year |
2018 |
Title of Journal |
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Volume |
98 |
Number |
9 |
Page |
94006 |
Abstract |
The measured electromagnetic form factors of A hyperon in the timelike region are significantly deviated from pQCD prediction. We attribute the nonvanishing cross section near threshold to be the contribution of below-threshold phi(2170) state, supporting its exotic structure. Above the threshold, we find significant role of a wide vector meson with the mass of around 2.34 GeV, which would be the same state present in pp annihilation reactions. As a result, we give a satisfactory description of the behavior of existing data without modifying pQCD expectation. |
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Others: |
The measured electromagnetic form factors of A hyperon in the timelike region are significantly deviated from pQCD prediction. We attribute the nonvanishing cross section near threshold to be the contribution of below-threshold phi(2170) state, supporting its exotic structure. Above the threshold, we find significant role of a wide vector meson with the mass of around 2.34 GeV, which would be the same state present in pp annihilation reactions. As a result, we give a satisfactory description of the behavior of existing data without modifying pQCD expectation. |
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