Canonical Interpretation Of The D_s0（2590）⁺ Resonance

Hadron physics,as an important branch of particle physics and nuclear physics,mainly studies the internal structure and strong interaction of hadrons.Quantum chromodynamics（QCD）is the basic theory to describe strong interaction,which is based on SU（3）group and Yang-Mills theory,predicting that the strong coupling coefficient decreases（increases）with the increase（decrease）of the energy standard,which well explains a large number of hadron physics experimental data,as well as the important characteristics of quark confinement under low energy and asymptotic freedom under high energy of strong interaction.At present,people’s understanding of the properties of QCD in the low energy region is still very limited,and the hadron state is in the low energy region of QCD,so the study of the hadron properties helps people to better understand the non-perturbation properties of QCD in the low energy region.Since the hadron resonance state is in the non-perturbation region of QCD,this makes it impossible to use the basic Lassen quantity,that is,the familiar perturbation expansion method cannot be used to solve the problem.Therefore,it is necessary to study the properties of hadron resonance states by carrying out various non-perturbation methods and phenomenological models with QCD spirit.Common non-perturbation methods and phenomenological models include relativistic quark model,quark pair generation model,chiral perturbation theory,chiral monopoly theory,QCD summation rule,etc.,which are widely used in the theoretical research of hadronic physics.The study of hadron resonance states requires the close cooperation of theoretical and experimental physicists at home and abroad.Theoretically,using the phenomenological model to analyze and interpret the experimental data,we can further extract the information of related hadron resonance states.Experimentally,in recent years,many large international scientific institutions have carried out research on the resonance states of hadrons and accumulated some experimental data,which provides a good platform for the theoretical study of the properties of hadronic states.Usually,for experimentally discovered hadronic states,one first analyzes their possibility as ordinary hadronic states before considering more complex structures.If the newly discovered resonance state can be explained reasonably under the framework of the traditional quark model,more complicated discussion is not necessary.In the traditional quark model,hadrons include mesons,where mesons are made up of quark-antiquark pairs,and baryons,which are made up of three quarks.In addition,QCD theory allows for the existence of some exotic states such as tetraquark states,glueballs,hadron molecular states and so on.Its mediator is the simplest strongly interacting system,and its energies range from the lightest π meon of 140 MeV to the b（?） system of 10 GeV,spanning the non-perturbation region and the perturbation region,making it an ideal place for us to study the properties of strongly acting systems.In the meson family,charm strange has always been one of the hot issues in hadron physics because of its mass and complex physical properties.Charm strange meson is written by a charm quark（c）and a strange quark（s）of hadron bound state,there are two kinds of concrete combination forms:c（?） and （?）s.The research on the charm strange meson theory can help us to further understand the charm strange spectrum and enrich the research of it.Theoretically,in the charm strange meson spectrum,since the discovery of a much smaller than theoretically predicted meson masses that are much smaller than the D_s0*（2317）and D_s1（2460）,the study of charm strange mesons has been of wide interest.Based on the spin cosmology and strong decay modes,The LHCb collaboration has recently discovered a new excited D_s⁺ meson state in the D⁺K⁺π^- terminal state of B⁰→D⁺D^-K⁺π^- decay process,named as D_s0（2590）⁺,its mass,width and spin scale are m=2591±6±7MeV,r=89±16±12MeV,Jp=0-.However,the experimentally measured mass appears to be lower than previous theoretical predictions,which has led to extensive theoretical studies,with some theoretical work treating this new particle as a product obtained via coupled-channel effects.In this work we describe the shielding effect in the potential model by considering the D_s0（2590）⁺resonance states.This is done by studying the mass spectrum of charmed singular mesons using a modified relativistic quark model that includes the shielding potential effect,and by ³P₀ model using the spatial wave function inside the meson obtained from the relativistic quark model to study the D_s0（2590）⁺ as D_s0（2 ¹S₀）of the strong decay,and finally compare whether the calculated decay widths and the experimental values match.Our theoretical results are that the charmed strange meson mass spectrum obtained in the relativistic quark model is in general agreement with the experimental results;in the model we take the D_s0（2590）⁺as D_s0（2 ¹S₀）state,the calculated decay width is about 75 MeV,which is within the experimental results within the error margin of 89±16±12 MeV.Our calculations suggest that the experimentally observed new resonance states can be interpreted as the conventional D_s0（2 ¹S₀）state.