Vector mesons and electromagnetic form factor of the Λ hyperon

The measured electromagnetic form factors of Λ 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 ϕ(2170) state, supporting its exotic structure. Above the threshold, we...

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Bibliographic Details
Published in:Physical review. D 2018-11, Vol.98 (9), p.094006, Article 094006
Main Authors: Cao, Xu, Dai, Jian-Ping, Xie, Ya-Ping
Format: Article
Language:English
Subjects:
Annihilation reactions
Form factors
Mesons
Vector mesons
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Summary:The measured electromagnetic form factors of Λ 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 ϕ(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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.98.094006