Flavor violating Higgs signals,such as the top FCNC decay t→ch0 and the LFV Higgs decay h0→τμ,have been studied at the LHC.These signals can arise within the general Two-Higgs Doublet Model(THDM),where each Higgs ...Flavor violating Higgs signals,such as the top FCNC decay t→ch0 and the LFV Higgs decay h0→τμ,have been studied at the LHC.These signals can arise within the general Two-Higgs Doublet Model(THDM),where each Higgs doublet couples to all fermion types through Yukawa matrices Yf 1 and Y f2.The Yukawa matrices can be assumed to have the same form or they could have different structures.In this paper we study the case when both Yf1 and Y f2 have completely different forms,but in such a way that they complement to produce a specific hermitian mass matrix.We find that for specific four-zero textures,the flavor violating Higgs couplings depend only on the free parameters tanβ,γf and the fermion masses.We use the current bounds on the low energy processes to derive constraints on the heavy Higgs boson mass,tanβandγf Then,we use these constraints to evaluate the LFV Higgs decays,which reach branching ratios that could be tested at the LHC.展开更多
We investigate in detail the charged Higgs production associated with a W boson at electron-positron colliders within the framework of the Type-I two-Higgs-doublet model(THDM).We calculate the integrated cross section...We investigate in detail the charged Higgs production associated with a W boson at electron-positron colliders within the framework of the Type-I two-Higgs-doublet model(THDM).We calculate the integrated cross section at the LO and analyze the dependence of the cross section on the THDM parameters and the colliding energy in a benchmark scenario of the input parameters of the Higgs sector.The numerical results show that the integrated cross section is sensitive to the charged Higgs mass,especially in the vicinity of mH±≃184 GeV at a 500 GeV e^+e^−collider,and decreases consistently with the increase of tanβin the low tanβregion.The peak in the colliding energy distribution of the cross section arises from the resonance of the loop integrals,and it moves towards the low colliding energy with the increase of mH±.We also study the two-loop NLO QCD corrections to both the integrated cross section and the angular distribution of the charged Higgs boson and find that the QCD relative correction is also sensitive to the charged Higgs mass and strongly depends on the final-state phase space.For tanβ=2,the QCD relative correction at a 500 GeV e^+e^−collider varies in the range of[-10%,11%]as mH±increases from 150 to 400 GeV.展开更多
Previous researches on the mechanical model of toppling failure mainly concentrated on twodimensional mechanical model(TwDM) analysis. The TwDM analysis assumes the width of the slab beam is unit width without conside...Previous researches on the mechanical model of toppling failure mainly concentrated on twodimensional mechanical model(TwDM) analysis. The TwDM analysis assumes the width of the slab beam is unit width without considering the lateral constraint force. The assumed conditions are obviously different from the site conditions, thus there is a certain difference between the calculated results and the field work. A three-dimensional mechanical model(ThDM)of toppling failure was established, considering that the slab beam was mainly subject to self-weight, the frictional resistance of interlayer and lateral constraint force. Due to the progressive characteristics of toppling failure, the concept and the formula of the first fracture depth(FFD) of toppling was raised and constructed. The case study indicates that the ThDM is more effective and can be accurately used to calculate the toppling fracture depth of the slab beam. The FFD decreases proportionally with the increase of slab beam width. FFD grows fast when the slab beam width is less than 2.0 m and it tends to be stable when the slab beam width is above 2.0 m. The FFD decreases with the increase of the lateral constraint coefficient, indicating that the boundary condition of the free space is positively correlated with the stability and depth of toppling. This is a good explanation of the free space effect. This study provides a reference for the stability evaluation and prevention-control design of toppling slope in the future.展开更多
文摘Flavor violating Higgs signals,such as the top FCNC decay t→ch0 and the LFV Higgs decay h0→τμ,have been studied at the LHC.These signals can arise within the general Two-Higgs Doublet Model(THDM),where each Higgs doublet couples to all fermion types through Yukawa matrices Yf 1 and Y f2.The Yukawa matrices can be assumed to have the same form or they could have different structures.In this paper we study the case when both Yf1 and Y f2 have completely different forms,but in such a way that they complement to produce a specific hermitian mass matrix.We find that for specific four-zero textures,the flavor violating Higgs couplings depend only on the free parameters tanβ,γf and the fermion masses.We use the current bounds on the low energy processes to derive constraints on the heavy Higgs boson mass,tanβandγf Then,we use these constraints to evaluate the LFV Higgs decays,which reach branching ratios that could be tested at the LHC.
基金Supported in part by the National Natural Science Foundation of China(11775211,11535002)the CAS Center for Excellence in Particle Physics(CCEPP)。
文摘We investigate in detail the charged Higgs production associated with a W boson at electron-positron colliders within the framework of the Type-I two-Higgs-doublet model(THDM).We calculate the integrated cross section at the LO and analyze the dependence of the cross section on the THDM parameters and the colliding energy in a benchmark scenario of the input parameters of the Higgs sector.The numerical results show that the integrated cross section is sensitive to the charged Higgs mass,especially in the vicinity of mH±≃184 GeV at a 500 GeV e^+e^−collider,and decreases consistently with the increase of tanβin the low tanβregion.The peak in the colliding energy distribution of the cross section arises from the resonance of the loop integrals,and it moves towards the low colliding energy with the increase of mH±.We also study the two-loop NLO QCD corrections to both the integrated cross section and the angular distribution of the charged Higgs boson and find that the QCD relative correction is also sensitive to the charged Higgs mass and strongly depends on the final-state phase space.For tanβ=2,the QCD relative correction at a 500 GeV e^+e^−collider varies in the range of[-10%,11%]as mH±increases from 150 to 400 GeV.
基金financially supported by the National Key R&D Program of China (2018YFC1504905)the Funds for Creative Research Groups of China (41521002)+1 种基金the Opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology, SKLGP2022K004)the National Natural Science Foundation of China (41907250, 41772317, 52104082)。
文摘Previous researches on the mechanical model of toppling failure mainly concentrated on twodimensional mechanical model(TwDM) analysis. The TwDM analysis assumes the width of the slab beam is unit width without considering the lateral constraint force. The assumed conditions are obviously different from the site conditions, thus there is a certain difference between the calculated results and the field work. A three-dimensional mechanical model(ThDM)of toppling failure was established, considering that the slab beam was mainly subject to self-weight, the frictional resistance of interlayer and lateral constraint force. Due to the progressive characteristics of toppling failure, the concept and the formula of the first fracture depth(FFD) of toppling was raised and constructed. The case study indicates that the ThDM is more effective and can be accurately used to calculate the toppling fracture depth of the slab beam. The FFD decreases proportionally with the increase of slab beam width. FFD grows fast when the slab beam width is less than 2.0 m and it tends to be stable when the slab beam width is above 2.0 m. The FFD decreases with the increase of the lateral constraint coefficient, indicating that the boundary condition of the free space is positively correlated with the stability and depth of toppling. This is a good explanation of the free space effect. This study provides a reference for the stability evaluation and prevention-control design of toppling slope in the future.
