Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon

15 Nov 2018  ·  Cao Xu, Dai Jian-Ping, Xie Ya-Ping ·

The measured electromagnetic form factors of $\Lambda$ hyperon in the time-like region are significantly deviated from pQCD prediction. We attribute the non-vanishing 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 $p\bar{p}$ annihilation reactions. As a result, we give a satisfactory description of the behavior of existing data without modifying pQCD expectation. read more

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High Energy Physics - Phenomenology Nuclear Theory