The Central Dependence Of The Hadrons In The LHC Energy Region

Quantum Chromo Dynamics predicts that it can produce a novel physical form — the quark-gluon Plasma in the condition of extremely high temperature and high density. Studying the property and hadronization mechanism of this new material form has always been an important and challenging task for high-energy physics. Relativistic Heavy Ion Collider experiments show that the QGP have been produced under the heart collision energy of 200 Ge V in Au + Au collisions and show a series of interesting features, such as strong collective behavior,the strangeness enhancement, etc. The Large Hadron Collider experiment which began to run in recent years has increased the collision energy to Te V magnitude that can produce larger and longer life QGP matter. It provides broader benefit platform for further studying the properties of the QGP and hadronization mechanism. So far, the LHC experimental data has accumulated a large amount of the experimental results about hadron production which show some new phenomena in RHIC, such as the restrained of protons and antiprotons production; the broken of hadron elliptic flows, etc.Quark combination mechanism can successfully explain many experimental phenomena in heavy-ion collisions of RHIC area, which is a strong candidate of QGP hadronization mechanism.Can quark combination mechanism give reasonable explanation of the experimental phenomena in the LHC area heavy-ion collisions? Is quark combination mechanism in higher energy region still available? What new features QGP that produced in the LHC early collision have? To solve these problems, this paper adopts the Shan Dong Quark Combination Model(SDQCM) to systematically research different hadron production in the various centralities under the LHC area Pb + Pb collision, mainly from two aspects of quantum yield and distribution ofTp made the following work:Firstly, we use the Shan Dong Quark Combination Model(SDQCM) to systematically research the yield density of various hadrons that are in different collision centralities from the center to the semi central collisions and edge collision under the heart collision energy of2.76 Tev in Pb + Pb collisions. We calculate the yield density of,πh,K ++±,p,--,Λ,Φ,ΞK,Ωs0and their antihadrons and compared their with the experimental data.Then we extract that can reflect the behavior of the QGP singularity changes with collision centrality.Secondly, we use Shan Dong Quark Combination Model to systematically study the dependence on centrality ofTp spectrum that is under mass heart energy system of the Pb + Pb hadrons collision.We calculate spectrum of various hadrons, such as,πh,K ++±,p,--,Λ,Φ,ΞK,Ωs0and so on, in the mid rapidity region,and the ratios of K/p 、 p/p 、0/sLK changed withTp, then compare with the experimental data and analysis the distribution of the group quarks which are extracted and directly reflect the nature of QGP.The above research results indicate: the SDQCM give us the self consistent explanation in heavy ion collisions at LHC energies of different centralities, including a variety of hadron yields and distributions in the edge of collisions. This embodies the quark combination hadronization mechanism in the high energy region of more general. This further suggests that, in the high energy reaction of Te V, even at the edge of the collision, QGP may also have produced.