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Charged Higgs Pair Production in a General Two Higgs Doublet Model at e^+e^- and μ^+μ^- linear colliders

Communications in Theoretical Physics 2014年第1期61卷 69-74页

作者： M.Hashemi Physics Department and Biruni Observatory College of SciencesShiraz University

In this paper, charged Higgs pair production through l^＋l^- → H^＋ H^-, where l = e or μ, is studied within the framework of a general Two Higgs Doublet Model （2HDM）. The analysis is relevant to a future e^＋e^- or μ^＋ μ^- collider operating at center of mass energy of √s = 500 GeV. Two different scenarios of small and large a values are studied. Here a is the parameter, which diagonMizes the neutral CP-even Higgs boson mass matrix. Within the Minimal Supersymmetric Standard Model （MSSM）, cross section of this process is almost the same at e＋ e- and #＋#- colliders. It is shown that at e^＋e^- eolliders within a general 2HDM, cross section is not sensitive to the mass of neutral Higgs bosons, however, it can acquire large values up to several picobarn at μ^＋μ^- colliders with the presence of heavy neutral Higgs bosons. A scan over Higgs boson mass parameter space is performed to analyze the effect of large masses of neutral Higgs bosons involved in the s-channel propagator and thus in the total cross section of this process.

关键词： 2HDM Higgs bosons linear colliders

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Effects of R-Parity Violating Supersymmetry in Top Pair Production at linear colliders with Polarized Beams

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Communications in Theoretical Physics 2007年第5X期48卷 891-894页

作者： WANG Xue-Lei LI Ji-Tao LIU Su-Zhen College of Physics and Information Engineering Henan Normal University Xinxiang 453007 China

In the minimal supersymmetric standard model with R-parity violation, the lepton number violating top quark interactions can contribute to the top pair production at a linear collider via tree-level u-channel squark exchange diagrams. We calculate such contributions and find that in the allowed range of these R-violating couplings, the top pair production rate as well as the top quark polarization and the forward-backward asymmetry can be significantly altered. By comparing the unpolarized beams with the polarized beams, we find that the polarized beams are more powerful in probing such new physics.

关键词： linear colliders minimal supersymmetric model top quark R-parity

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Single Charged Top-Pion Production at the Next Generation e^＋e^- colliders

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Communications in Theoretical Physics 2005年第1期43卷 133-138页

作者： WANGXue-Lei DULin-Lin XUWen-Na CollegeofPhysicsandInformationEngineering HenanNormalUniversityXinxiang453002China

The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e~- → tbΠ_t~-) Teaches the level of tens of fb andσ(e~+ e~- → W~+Π_t~-) reaches the level of a few fb. With the yearly integrated luminosity of ￡～ 500 fb~(-1) expected at the planned colliders, one could collect thousands of charged top-pion ofevents via the process e~+ e~- → tbΠ_t~- and hundreds of events via the process e~+ e~- →W~+Π_t~-. The flavor changing decay mode Π_t~- → bc is the best channel to detect chargedtop-pion due to the clean SM background. With a large number of events and the clean background, thecharged top-pion should be observable at the planned colliders. Therefore, our studies in thispaper can help us to search for charged top-pion, and furthermore, to test the TC2 model.

关键词： top-pion top-color-asisted technicolor model linear colliders

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