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Search for the $$K^-pp$$ bound state via $$gamma d rightarrow K^+pi^- X$$ reaction at $$E_{gamma}$$ = 1.5 - 2.4 GeV

$$E_{gamma}$$=1.5 $$-$$ 2.4GeVでの$$gamma d rightarrow K^+pi^- X$$の反応を介して$$K^-pp$$束縛状態を検索する

時安 敦史*; 今井 憲一; Hwang, S. H.*; LEPS Collaboration*

Tokiyasu, Atsushi*; Imai, Kenichi; Hwang, S. H.*; LEPS Collaboration*

A search for the $$K^- pp$$ bound state (the lightest kaonic nucleus) has been performed using the $$gamma d rightarrow K^+pi^-X$$ reaction at $$E_gamma$$ = 1.5 $$-$$ 2.4 GeV at LEPS/SPring-8. The differential cross section of the $$K^+pi^-$$ photo-production off deuterium ($$d^2 sigma / d rm{cos}theta^{lab}_{K^+}/drm{cos}theta^{lab}_{pi^-}$$) has been measured for the first time in this $$K^+ pi^-$$ energy region. A peak structure was searched for in the inclusive missing mass spectrum. A statistically significant peak structure was not observed in the region from 2.22 to 2.36 GeV/$$c^2$$. The upper limits of the differential cross section of the $$K^-pp$$ bound state production were determined to be (0.17$$-$$0.55), (0.55$$-$$1.7) and (1.1$$-$$2.9) $$mu b$$ at 95% confidence level with the assumed widths of 20 MeV, 60 MeV and 100 MeV.

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パーセンタイル:2.8

分野:Astronomy & Astrophysics

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