Sequential single pion production explaining the dibaryon"d^(*)(2380)"peak  

作　　者：R.Molina Natsumi Ikeno Eulogio Oset 

机构地区：[1]Departamento de Física Teórica and IFIC,Centro Mixto Universidad de Valencia-CSIC,Institutos de Investigación de Paterna,Aptdo.22085,46071 Valencia,Spain [2]Department of Agricultural,Life and Environmental Sciences,Tottori University,Tottori 680-8551,Japan

出　　处：《Chinese Physics C》2023年第4期1-10,共10页中国物理C（英文版）

基　　金：support from the CIDEGENT program with Ref.CIDEGENT/2019/015;from the spanish national grant PID2019-106080GB-C21;partly supported by JSPS Overseas Research Fellowships;JSPS KAKENHI Grant Number JP19K14709;partly supported by the Spanish Ministerio de Economia y Competitividad and European FEDER funds under Contracts No.FIS2017-84038-C2-1-P B and No.FIS2017-84038-C2-2-P B;funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No.824093 for the STRONG-2020 project。

摘　　要：In this study,we investigate the two step sequential one pion production mechanism,that is,np(I=0)→π^(-)pp followed by the fusion reaction pp→π^(+)d,to describe the np→π^(+)π^(-)d reaction withπ^(+)π^(-)in state I=0.In this reaction,a narrow peak identified with a"d(2380)"dibaryon has been previously observed.We discover that the second reaction step pp→π^(+)d 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.

关 键 词：DIBARYON sequential mechanism EXPLANATION 

分 类 号：O572.33[理学—粒子物理与原子核物理]