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arxiv: 0902.3633 · v2 · submitted 2009-02-20 · ⚛️ nucl-th

Searching for signatures around 1920 MeV of a N^* state of three hadron nature

classification ⚛️ nucl-th
keywords statearoundclosegammareactionthresholdargumentsbound
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We provide a series of arguments which support the idea that the peak seen in the $\gamma p \to K^+ \Lambda$ reaction around 1920 MeV should correspond to the recently predicted state of $J^P=1/2^+$ as a bound state of $K \bar{K}N$ with a mixture of $a_0(980)N$ and $f_0(980)N$ components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross section for $\gamma p \to K^+ K^- p$ at energies close to threshold and of $d \sigma/d M_{inv}$ for invariant masses close to the two kaon threshold.

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