Doubly Heavy-flavored Hadron And VV'H Production At High Energy Colliders

In this thesis,we study the production of doubly heavy-flavored hadrons and VV'H at the high energy colliders in the framework of the Standard Model(SM).Specifically,we study the S-wave Bc(*)meson,P-wave Bc**meson and doubly heavy-flavored bary-on ?cc,?bc,?bb photoproduction at leading-order(LO)at the Large Hadron Electron Collider(LHeC),and we also study the W-W+H?W±H? and ZH? production up to next-to-leading-order(NLO)QCD+NLO electroweak(EW)accuracy at the Large Hadron Collider(LHC).With the discovery of Higgs boson by ATLAS and CMS at the LHC,all the fun-damental particles in the SM are confirmed and a tremendous achievement is made for the particle physics.Thus the SM is proved to be the most successful theory for the description of fundamental particles and their interactions.However,the SM is only considered as an effective theory at the TeV scale region,besides,the SM can not de-scribe the dark matter and dark energy and fails to explain asymmetry of matter and antimatter,neutrino oscillation and tuning problem,etc.Any deviation between theo-retical predictions and experimental data means the possible window for new physics,therefore one of the most important missions at the LHC at present or in the near future is precision test of the SM.Precision test of the SM can be roughly divided into the test of the QCD and the test of the EW theory.Doubly heavy-flavored hadron production at high energy colliders involves both the features of perturbative QCD(pQCD)and nonperturbative QCD and is predicted to have a factorization form:the hard production of a heavy quark pair at short distance perturbatively and the hadronization of the heavy quark pair to physical doubly heavy-flavored hadron at long distance nonperturbatively.The typical energy scale of the production of a heavy quark pair is above the twice of the heavy quark mass(2mQ>>1 GeV),thus the short distance coefficients can be calculated in pQCD,while the evolu-tion of the heavy quark pair into a doubly heavy-flavored hadron at long distance reveals the nonperturbative aspects of QCD.Thus,the study of doubly heavy-flavored hadrons plays an important role in testing and understanding the perturbative and nonperturba-tive features of QCD.The Higgs boson plays a critical role in the EW symmetry spontaneous breaking(EWSB)and accounts for the mass of fundamental particles.Gauge bosons associat-ed with Higgs boson production is also directly related to the gauge couplings(triple and quartic gauge couplings)and the gauge boson-Higgs boson couplings and can be used to test the anomalous Higgs gauge couplings.Thus,these processes can provide a good way to probe the EWSB and search for new physics beyond the SM.Besides,the production of VV'H is also irreducible background to some important processes,for example,pp?W-W+H?W-W+bb is the background of pp?HH?W-W+bb and pp?tt?W-W+bb.Gauge bosons associated with Higgs boson production is important for the test of EW theory and the studies of Higgs physics and top physics.Within the framework of nonrelativistic quantum chromodynamics(NRQCD),we predict the S-wave Bc(*)meson,P-wave Bc**meson and doubly heavy-flavored baryon?cc,?bc,?bb photoproduction at leading order(LO)at e-p colliders.The total cross sections of doubly heavy-flavored hadrons are predicted at different e-p colliding en-ergies and the kinematic distributions,the scale uncertainty,the quark mass uncertainty and parton distribution function(PDF)uncertainty are given at the 1.30 TeV LHeC.We study the NLO QCD+EW corrections of the production of VV'H at the LHC.The QCD corrected cross sections are matched with Parton Shower(PS)and the unstable particles subsequent decays are also studied.The total cross sections and relative cor-rections are given at different colliding energy at the LHC.Kinematic distributions and exhaustive discussions about the uncertainties of renormalization scale,factorization scale and PDF are given at the 14 TeV LHC.Some innovations of the production of doubly heavy-flavored hadrons are listed as follows:· The results of the photoproduction of Bc(*)meson,Bc*meson,?cc,?bc and ?bb at LHeC are presented for for the first time.· We investigate the production of doubly heavy-flavored hadrons induced by the heavy quarks inside the collision hadrons at e-p collider and apply the general-mass variable-flavor-number(GM-VFN)scheme to the production of doubly heavy-flavored hadrons at e-p collider for the first time.Some innovations of the production of VV'H are listed as follows:· The NLO QCD+EW corrected results for the production of VV'H at the LHC are presented for the first time,besides for the production of W-W+H,we also calculate the subprocess ?+??W-W+H at the LHC for the first time.· Four subtraction schemes are adopted to avoid the“double counting”from the top quark production subprocess b+g/??W-tH?W-W+Hb.· For the production of V?H,two photon-jet isolation schemes,quark-to-photon fragmentation function and the Frixione isolation method,are adopted for the event classification as well as the definition of theoretical IR safe observable.