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Search for the deeply bound $$K^- pp$$ state from the semi-inclusive forward-neutron spectrum in the in-flight $$K^-$$ reaction on helium-3

$$^{3}$$Heターゲットと飛行$$K^-$$の反応における前方中性子スペクトルを用いた強束縛$$K^-pp$$状態の探索

橋本 直*  ; 谷田 聖  ; J-PARC E15 Collaboration*; 他65名*

Hashimoto, Tadashi*; Tanida, Kiyoshi; J-PARC E15 Collaboration*; 65 of others*

An experiment to search for the $$K^-pp$$ bound state was performed via the in-flight $$^3{rm He}(K^-,n)$$ reaction using $$5.3 times 10^9$$ kaons at 1 GeV/$$c$$ at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $$theta^{rm lab}_n=0^{circ}$$, no significant peak was observed in the region corresponding to $$K^- pp$$ binding energy larger than 80 MeV, where a bump structure has been reported in the $$Lambda p$$ final state in different reactions. Assuming the state to be isotropically decaying into $$Lambda p$$, mass-dependent upper limits on the production cross section were determined to be 30-180, 70-250, and 100-270 $$mu$$b/sr, for the natural widths of 20, 60, and 100 MeV, respectively, at 95% confidence level.

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パーセンタイル:87.13

分野:Physics, Multidisciplinary

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