Effect Of Rpv On Pp/p(p|-)â†'eÏ„/μτ+X Processes At The Hadron Collider

Based on the gauge group ofSU （3）C SU（2）L U（1）Y, the standard model（SM） is a gauge theorywhich describes the strong, eletronmagnetic and weak interactions. It makes many theoretical predictionshighly in agreement with experimental data, and to some extent survives the practice testing. But it is not afinal and perfect theory, and still has some deficiencies. At present, people generally consider SM is aneffective theory in low energy scale. In order to deal with the problems in higher energy scale, one shouldexplore the new physics.Among many new physics scenarios, R parity violating minimal supersymmetry standard model（RPVMSSM） is an ideal candidate with special advantages. The gauge invariance requires that lepton number （L）and baryon number （B） must conserve in the SM. While in the RPV MSSM, the lepton number violatingprocesses could occur and single SUSY particle is generated and decays to dilepton. Hence,ν^qâ†'liljprocesses become an ideal field to search for the signal of R parity violating （RPV）. If suchprocesses are observed in the hadron collider, it will provide experimental evidence for the new physics.Therefore, it has a vital significance to study the RPV effects onpp ppâ†'ν%（q%）â†'eÏ„ μτ+Xprocesses atthe hadron collider.In experiment, Tevatron and LHC collaborations have probed ppâ†'lilj+Xand ppâ†'eμ+Xprocesses with the RPV interaction, respectively. The CDF and D0detectors in Tevatron collider have gotthe upper limit of cross section of the ppâ†'lilj+Xprocesses, and restricted the coupling parametersspace. The ATLAS detector in the LHC have given the stronger limits on the mass of theÏ„sneutrino andZ ’vector boson using the collected data than those of Tevatron.Theoretically, physicsts have researched the relevant processes with RPV interaction at the hadroncollidetrs, predicted cross sections, and restricted the coupling parameters. In this thesis, we study the treelevel processespp ppâ†'eÏ„ μτ+Xat colliders Tevatron and LHC in RPV MSSM model. The resultsshow that, squarks and sneutrinos have small contribution to the crosss section ofpp ppâ†'eÏ„+X process, while squarks are dominated in thepp ppâ†'μτ+Xprocess. Moreover,ν%2,ν3andq₂mainlycontribute to the crosss section ofpp ppâ†'eÏ„+Xamong sfermions and the latter two generation ofsquarks play a dominate role in thepp ppâ†'μτ+Xprocess. Our conclusion could provide reference tosearch for RPV signal at hadron colliders and we expect it could be tested with more accumulated data inthe future.</sup>