Search For New Phyiscs At High Energy Collider

The Higgs particle is the last observed particle in the standard model.Fermions and other gauge bosons obtain masses by spontaneous symmetry breaking.The European Organization for Nuclear Research(CERN)has declared that a new particle has been discovered at the LHC in 2012,which can be the candidate for Higgs particle being consistent with the production and decay in the Standard Model(SM).The discovery of the new particle opens a new door for further study of the electro-weak symmetry breaking mechanism and the property of Higgs,such as mass,spin,coupling,etc.Confirming whether it is the SM-Higgs and exploring the extension of Higgs sector are the hot topics for particle physics.Recently,the experiments have presented the results for the interaction between Higgs and bottom quark via H? bb process.Many theories beyond the standard model predicted the Higgs boson.The measurement of the Higgs boson can deeper research on the Beyond Standard Model(BSM)and constrain the parameters space.A well-motivated extension of the standard model 2HDM,which is obtained by adding a second SU(2)L Higgs doublet,leads to five physical Higgs particles:h0,H0,A0,H+.The h0 is served for the SM-Higgs traditionally.This dissertation focuses on the SM Higgs and exotic Higgs associated production.The main process is pp?bb?k with cpk?bb and ?k??+?-decaying modes.The process has advantages for the Higgs studies.One is that the process is explored and researched in the experiments easily,the other is it can further study the Yukawa interaction and provide a theoretical basis for further understanding of Higgs properties.Recently,the experiments have performed extensive research on the exotic Higgs,which constrained the exotic Higgs mass and interaction parameters and given the existence range for the parameter space of the 2HDM.The main work of this paper has presented as follows.The b-tagging becomes an important tool to search for new heavy resonance production at LHC.We use b-tagging method to investigate the neutral Higgs production in association with a bottom quark,and perform the detector simulation for the signal process with the Higgs decaying into bb or?+?-together with the dominant backgrounds.For the SM Higgs,the bbh process is hard to be observed at LHC 14 TeV due to the large background,but for the exotic Heavy Higgs,the bbH and bbA production can be enhanced by tan B.For the bb?+?-channel,its significance after all cuts is higher than that of bbbb,x-tagging may be another useful tool to search for heavy resonance production.Our work shows that bbbb and bb?+?-processes will play an important role to search for the production of the exotic heavy Higgs or other heavy resonance particles at LHC and other future hadron colliders.