Spectrum Of Heavy Flavor Hadrons And Regge Trajectories

For a heavy flavor hadron(singly heavy hadron)with only one heavy quark,heavy quark effective theory predicts that its properties has the heavy quark symmetry,that is,they are symmetric for the exchange of the heavy flavors in the infinitely heavy limit of the heavy quark.(heavy quark mass MQ→∞),Hadron properties have heavy quark symmetry(HQS),For example,the total angular momentum of heavy quark spin and light flavor freedom is a conserved quantity.Thus,the quantum states of singly heavy hadron are classified by quantum Numbers of light flavor degrees of freedom.The discoveries of the first doubly heavy baryonΞcc++=ccu in 2017,as well as a few singly heavy hadrons(B(5970)+、Ac(2860)+、Ξc(2942)、Ξb(6227)-、∑b(609 7)+-)and the five Ωc(=ssc)are extremely important for the building the families of the heavy flavor hadron and checking the HQS.In addition,the unknown decay constant and shape factor of Bc mesons are closely related to the physics beyond SM.In this thesis,the naive quark model constrained by HQS is used to study the ground state of singly heavy baryon and the mass of low excited state of heavy mesons.The main content of this paper is divided into three chapters:The first chapter firstly gives a brief introduction to the experimental detection and basic theory of hadron physics.Then,we review the symmetry of the hadrons and the quark model.Finally,we introduce the hot topic of hadron physics--heavy hadrons and multi-quark states and their inter-relations.The second chapter reviews Karliner-Rosner’s naive quark model of heavy flavor baryon containing heavy flavor binding energy and its phenomenological basis.Nextly,We give the Regge mass formula of heavy flavor hadron system under QCD string model picture and a mapping of this relation to singly heavy baryon and meson mass.Then,we give some predictions of the formula for higher excited states.Finally,we show that the origin of the short-range binding in the heavy flavor mass formula is the short-range colorcoulomb attraction between quarks.In the third chapter,we tentatively put forward the picture of the tadpole model with help of the string model and the corresponding calculation method of hadron mass.The constituent quark mass in hadron consists of the relativistic effective mass of the quark plus the part of the string energy that tied to the quarks.Secondly,we introduce the method for calculating the mass splitting of the spin orbital interaction and tensor interaction in the P-wave of heavy and light meson.Then,we introduce the 1D wave D meson mass splitting.Finally,we end with a summary and outlook about the development of this work in the future.