Observation of the ""-like structure in the reaction at 1.69 GeV/

Ichikawa, Yudai ; Hasegawa, Shoichi ; Hosomi, Kenji ; Imai, Kenichi; Sako, Hiroyuki ; Sato, Susumu ; Sugimura, Hitoshi; 37 of others*

We have observed a ""-like structure in the reaction at 1.69 GeV/. In this reaction a hyperon resonance is expected to be produced as a doorway to form through the process. However, most of the produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum ( 250 MeV/) proton(s)at large emission angles ( $39^circ<theta_{rm lab.}<122 circ$ ) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/, which corresponds to the binding energy of 95 $^{+18}_{-17}$ (stat.) $^{+30}_{-21}$ (syst.) MeV and the width of 162 $^{+87}_{-45}$ (stat.) $^{+66}_{-78}$ (syst.) MeV.

Language	:	English
Journal	:	Progress of Theoretical and Experimental Physics (Internet)
Volume	:	2015
Number	:	2
Pages	:	p.021D01_1 - 021D01_8
Publication Year/Month	:	2015/02
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Paper URL	:	https://doi.org/10.1093/ptep/ptv002
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	J-PARC原子核素粒子実験施設
Press Release	:
Article of JAEA R&D Review	:	Search for a New Type of Nuclei; Observation of the Bound State between Kaons and Nuclei[/]
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Registration No. : AA20140870
JAEA Abstracts No. : 44000250
Paper Submission No. : 16939

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