Detailed derivation of the ^(3)P_(0) strong decay model applied to baryons  

作　　者：T.Aguilar A.Capelo-Astudillo M.Conde-Correa A.Duenas-Vidal P.G.Ortega J.Segovia 

机构地区：[1]Departamento de Física,Escuela Politécnica Nacional,Quito 170143,Ecuador [2]Departamento de Física Fundamental,Universidad de Salamanca,E-37008 Salamanca,Spain [3]Instituto Universitario de Física Fundamental y Matemáticas(IUFFyM),Universidad de Salamanca,E-37008 Salamanca,Spain [4]Departamento de Sistemas Físicos,Químicos y Naturales,Universidad Pablo de Olavide,E-41013 Sevilla,Spain

出　　处：《Chinese Physics C》2025年第1期139-153,共15页中国物理C(英文版)

基　　金：Work partially financed by the Escuela Politécnica Nacional under projects PIS-22-04 and PIM 19-01;EU Horizon 2020 research and innovation program,STRONG-2020 project,under grant no.824093;Ministerio Español de Ciencia e Innovación under grant nos.PID2022-141910NB-I00 and PID2022-140440NB-C22;Junta de Andalucía under contract no.PAIDI FQM-370。

摘　　要：By using the ^(3)P_(0) pair creation model,we provide a detailed derivation of the transition matrix for a baryon decaying into a meson-baryon system.This analysis was successfully conducted for a meson in[J.Segovia,D.R.Entem,and F.Fernandez,Phys.Lett.B 715,322(2012),and we extend the same formalism to the baryon sector,focusing on the △(1232)→πN strong decay width because all hadrons involved in the reaction are very well established,the two hadrons in the final state are stable and require no further analysis,all quarks are light and thus equivalent,and the decay width of the process is relatively well measured.Utilizing a very common Rayleigh-Ritz variational method to solve the 2-and 3-body Schodinger bound-state equation in which the hadron's radial wave functions are expanded in terms of a Gaussian basis,we can relate the expression of the invariant matrix element with the mean-square radii of hadrons involved in the decay.We use their experimental measures in such a way that only the strength of the quark-antiquark pair creation from the vacuum is a free parameter.This is then taken from our previous study on strong decay widths in the meson sector[J.Segovia,D.R.Entem,and F.Fernandez,Phys.Lett.B 715,322(2012),and the obtained results are compatible with the experimental results for the calculated △(1232)→πN decay width.Despite requiring the calculation of additional baryon strong decays,a feasible avenue towards a unified description of both baryon and meson strong decay widths within a single constituent quark model framework may be attainable.Finally,this research has been developed to lay the foundation for a novel raft of applications to exotic hadrons,i.e.,the description of the baryon's coupling to meson-baryon thresholds,one of the mechanisms that is considered to be responsible for providing either a large renormalization to naive states or genuine dynamicallygenerated meson-baryon molecules.

关 键 词：baryon strong decays ^(3)P_(0)decay model quark model 

分 类 号：O57[理学—粒子物理与原子核物理]