Journal
PHYSICAL REVIEW C
Volume 104, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.104.014614
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Funding
- JSPS Overseas Research Fellowships
- JSPS KAKENHI [JP19K14709]
- CIDEGENT program [CIDEGENT/2019/015]
- Spanish National Grant [PID2019-106080GB-C21]
- Spanish Ministerio de Economia y Competitividad
- European FEDER [FIS2017-84038-C2-1-P B, FIS2017-84038-C2-2-P B]
- European Union [824093]
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The model developed for the pp -> pi(+)d reaction involves multiple transitions and fusions, resulting in a large cross section for the reaction. The process is dominated by the pp system and transfers angular momentum effectively, making it suitable for describing another reaction.
We develop a model for the pp -> pi(+)d reaction based on the pp -> Delta(1232)N transition followed by Delta(1232) -> pi N' decay and posterior fusion of NN' to give the deuteron. We show that the triangle diagram depicting this process develops a triangle singularity leading to a large cross section of this reaction compared to ordinary fusion reactions. The results of the calculation also show that the process is largely dominated by the pp system in L = 2 and S = 0, which transfers J = 2 to the final pi(+)d system. This feature is shown to be well suited to provide L = 2, S = 1, and J(tot) = 3 for np in the np(I = 0) pi(-)pp reaction followed by the pp -> pi(+)d reaction, which has been proposed recently, as a means of describing the so far assumed dibaryon d* (2380) peak.
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