Photoproduction and electroproduction of via $gamma^{()} pto K^{+}pi^0Sigma^0$

$gamma^{()} pto K^{+}pi^0Sigma^0$ 反応における光・電磁生成でみる

We study the photo- and electro-productions of the vector kaon off the proton, i.e., $gamma^{(*)} pto K^{*+}pi^0Sigma^0$ , and investigate the line shape of the invariant mass in an effective Lagrangian approach with the inclusion of a $K^{*}NLambda^{*}$ interaction. Relevant electromagnetic form factors for the neutral hyperons and charged strange mesons are constructed by considering experimental and theoretical information. We find that the $Lambda^{*}$ peak is clearly observed for the photo- and electro-productions with the finite $K^{*}NLambda^{*}$ interaction, whereas the clear peak signals survive only for the electro-production, when we ignore the interaction. These different behaviors can be understood by different dependences in the $K^{*}$ electromagnetic and $K^{*}togamma K$ transition form factors. We suggest a photon-polarization asymmetry to extract information of the $K^{*}NLambda^{*}$ interaction. It turns out that near the $Lambda^{*}$ peak region becomes negative with a finite $K^{*}NLambda^{*}$ interaction while positive without it for , due to the different naturalities of and $K^{*}$ exchanges. For , we observe more obvious signals in the peak region due to the additional contribution of the longitudinal virtual photon for $Lambda^{*}$ .

発表言語	:	English
掲載資料名	:	Physical Review C
巻	:	100
号	:	1
ページ数	:	p.015205_1 - 015205_10
発行年月	:	2019/07
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論文URL	:	https://doi.org/10.1103/PhysRevC.100.015205
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抄録集掲載番号 : 47001435
論文投稿番号 : 22060

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