Sequential single pion production explaining the dibaryon "d*(2380)" peak |
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| Authors: | R. Molina Natsumi Ikeno Eulogio Oset |
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| Affiliation: | 1. Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain2. Department of Agricultural, Life and Environmental Sciences, Tottori University, Tottori 680-8551, Japan |
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| Abstract: | In this study, we investigate the two step sequential one pion production mechanism, that is, begin{document}$ np(I=0)to $end{document}![]() ![]() begin{document}$ pi^-pp $end{document}![]() ![]() followed by the fusion reaction begin{document}$ ppto pi^+d $end{document}![]() ![]() , to describe the begin{document}$ npto pi^+pi^-d $end{document}![]() ![]() reaction with begin{document}$ pi^+pi^- $end{document}![]() ![]() in state begin{document}$ I=0 $end{document}![]() ![]() . In this reaction, a narrow peak identified with a "begin{document}$ d(2380) $end{document}![]() ![]() " dibaryon has been previously observed. We discover that the second reaction step begin{document}$ ppto pi^+d $end{document}![]() ![]() is driven by a triangle singularity that determines the position of the peak of the reaction and the high strength of the cross section. The combined cross section of these two mechanisms produces a narrow peak with a position, width, and strength, that are compatible with experimental observations within the applied approximations made. This novel interpretation of the peak accomplished without invoking a dibaryon explains why this peak has remained undetected in other reactions. |
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| Keywords: | dibaryon sequential mechanism explanation |
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