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Near-threshold $$Lambda (1520)$$ production by the $$vec{gamma}$$ $$p$$ $$rightarrow$$ $$K$$$$^{+}$$ $$Lambda$$ (1520) reaction at forward $$K^+$$ angles

しきい値近くでの$$vec{gamma}$$ $$p$$ $$rightarrow$$ $$K$$$$^{+}$$ $$Lambda$$(1520)反応の$$K$$$$^{+}$$前方測定による$$Lambda$$(1520)生成

郡 英輝*; 今井 憲一; LEPS Collaboration*

Kori, Hideki*; Imai, Kenichi; LEPS Collaboration*

$$vec{gamma}$$ $$p$$ $$rightarrow$$ $$K$$$$^{+}$$ $$Lambda$$(1520)反応の微分断面積と直線偏光による非対称を、反応のしきい値から2.4GeVまでのエネルギー範囲で測定した。重心系エネルギーで2.11GeVのところに新しいバンプ構造を見つけた。このバンプ構造はスピン5/2以上の核子共鳴によるものか、又は新しい反応過程、たとえば同じようなバンプ構造が見つかっている$$phi$$生成との干渉効果によるものと思われる。

Differential cross sections and photon-beam asymmetries for the $$vec{gamma}$$ $$p$$ $$rightarrow$$ $$K$$$$^{+}$$ $$Lambda$$ (1520) reaction have been measured with linearly polarized photon beams at energies from the threshold to 2.4 GeV. A new bump structure was found at $$W$$ = 2.11 GeV in the cross sections. The bump structure might be produced by a nucleon resonance with $$J$$ $$geq 5/2$$ or by a new reaction process, for example, an interference effect with the $$phi$$ photoproduction having a similar bump structure.

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パーセンタイル:16.07

分野:Physics, Multidisciplinary

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