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Associated Productions of HZZ and HHZ at Linear Colliders in Large Extra Dimension Model

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Communications in Theoretical Physics 2006年第3期45卷 437-446页

作者： ZHOU Ya-Jin MA Wen-Gan HAN Liang zhang ren-you JIANG Yi Department of Modern Physics University of Science and Technology of China Hefei 230026 China

In this paper we investigate the effects of the large extra dimensions on the two processes e＋ e-→＋ H^0 Z^0 Z^0 and e^＋e^-→ H^0H^0 Z^0 at linear colliders in both unpolarized and polarized collision modes. We find that the virtual Kaluza-Klein graviton exchange can significantly enhance the cross section from their standard model expectations for these two processes. The results show that the LED effect on the process e＋ e-→＋ H^0 Z^0 Z^0 allows the observation limits on the effective scale Ms to be probed up to 9. 75 TeV and 10.1 TeV in the unpolarized and ＋-（λe＋ =1/2, λe-= -1/2） polarized beam collision modes （with Pe＋ = 0.6, Pe-=0.8）, respectively. For the process e＋ e-→＋ H^0 H^0 Z^0, these limits on Ms can be probed up to 6.06 TeV and 6.38 TeV in the unpolarized and polarized collision modes separately. We find that the λe＋ = 1/2, λe-= -1/2 polarization collision mode in both processe＋ e-→＋ H^0 Z^0 Z^0 and e＋ e-→＋ H^0 H^0 Z^0 may provide a possibility to improve the sensitivity in probing the LED effects.

关键词： large extra dimensions linear collider Higgs boson gauge boson

eμ Production in R-Parity Violating Supersymmetric Model at Hadron Colliders

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Communications in Theoretical Physics 2007年第3X期48卷 491-501页

作者： WANG Shao-Ming HAN Liang MA Wen-Gan zhang ren-you JIANG Yi Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We investigate the lepton flavor violating productions pp/pp→eμ ＋ X in the framework of the R-parity violating （RPV） supersymmetric model at the Tevatron and the CERN large hadron collider （LHC）. We present the total cross sections including the next-to-leading order （NLO） QCD corrections and the contribution from gluon-gluon fusion subprocess. Our numerical results show that the one-loop QCD corrections significantly increase the tree-level cross sections, and the variation of K factor is in the range between 1.28 （1.32） and 1.79 （1.58） at the Tevatron （LHC）. We find that the QCD correction from the one-loop gluon-gluon fusion subprocess is remarkable at the LHC and should be taken into account.

关键词： R-parity violating supersymmetric model QCD corrections

SUSY QCD Impact on Top-Pair Production Associated with a Z^0-Boson at a Photon-Photon Collider

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Communications in Theoretical Physics 2009年第8期52卷 302-310页

作者： DONG Chuan-Fei MA Wen-Gan zhang ren-you GUO Lei WANG Shao-Ming Department of Modern Physics University of Science and Technology of China （USTC） Hefei 230026 China

The top-pair production in association with a Z^0-boson at a photon-photon collider is an important process in probing the coupling between top-quarks and vector boson and discovering the signature of possible new physics. We describe the impact of the complete supersymmetric QCD （SQCD） next-to-leading order （NLO） radiative corrections on this process at a polarized or unpolarized photon collider, and make a comparison between the effects of the SQCD and the standard model （SM） QCD. We investigate the dependence of the lowest-order （LO） and QCD NLO corrected cross sections in both the SM and minimal supersymmetric standard model （MSSM） on colliding energy √s in different polarized photon collision modes. The LO, SM NLO, and SQCD NLO corrected distributions of the invariant mass of tt^--pair and the transverse momenta of final Z^0-boson are presented. Our numerical results show that the pure SQCD effects in γγ →tt^- Z^0 process can be more significant in the ＋＋ polarized photon collision mode than in other collision modes, and the relative SQCD radiative correction in unpolarized photon collision mode varies from 32.09% to -1.89% when √s goes up from 500 GeV to 1.5 TeV.

关键词： supersymmetric QCD photon-photon collider top-gauge boson coupling

Top Quark Flavor Changing Decay t→ cH^0 in Little Higgs Model

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Communications in Theoretical Physics 2005年第4X期44卷 651-658页

作者： Farshid Tabbakh LIU Jing-Jing MA Wen-Gan zhang ren-you HOU Hong-Sheng Department of Modern Physics University of Science and Technology of China Hefei 230027 China

We study theoretically the quantum effects of the littlest Higgs model (LH) mediated by flavor changing one-loop Feynman diagrams on the rare decay process t → cH0. The comparison of the decay width in the LH model with that in the standard model (SM) is made. We find that the decay branch ratio of t → cH0 in the LH model is at most of the order ～ 10-12, which is two order larger than in the SM. The numerical results show that the difference between the branch ratios in the LH model and the SM is generally sensitive to the LH model parameters, such as symmetry breaking scale f, Higgs boson mass mH0, and x = v'4f /v2 in our chosen parameter space, but relatively insensitive to the value choice of the cosine of the mixing angle c and the ratio λ1/λ2.

关键词： littlest Higgs model top quark rare decay flavor changing neutral current

J/ψProduction Associated with the W-Boson at the 7 TeV Large Hadron Collider

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Chinese Physics Letters 2013年第9期30卷 39-42页

作者： SONG Mao LI Gang MA Wen-Gan zhang ren-you GUO Lei GUO Jian-you School of Physics and Material Science Anhui UniversityHefei 230039 Department of Modern Physics University of Science and Technology of ChinaHefei 230026

We calculate the complete next-to-leading order(NLO)QCD corrections to J/ψ+W associated production within the factorization formalism of nonrelativistic QCD at the 7 TeV Large Hadron *** provide the numerical results for the leading-order(LO),NLO QCD corrected differential cross sections of the J/ψtransverse momentum by adopting the event selection criteria requested by the ATLAS *** is found that the differential cross section at the LO is significantly enhanced by the NLO QCD corrections.

关键词： correction momentum transverse

Triple Z^(0)-Boson Production in a Large Extra Dimensions Model at the International Linear Collider

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Chinese Physics Letters 2012年第11期29卷 31-35页

作者： JIANG Ruo-Cheng LI Xiao-Zhou MA Wen-Gan GUO Lei zhang ren-you Department of Modern Physics University of Science and Technology of ChinaHefei 230026

We investigate the effects induced by the interactions of the Kaluza–Klein graviton with the standard model(SM)particles on the triple Z^(0)-boson production process at the International Linear Collider in the framework of the large extra dimension(LED)*** present the dependence of the integrated cross sections on the electron-positron colliding energy√s,and various kinematic distributions of final Z^(0) bosons and their subsequential decay products in both the SM and the LED *** also provide the relationship between the integrated cross section and the fundamental scale MS by taking the number of the extra dimensions(d)as 3,4,5,and 6,*** numerical results show that the LED effect can induce an observable relative discrepancy for the integrated cross section(δ_(LED)).We find that the relative discrepancy of the LED effect can even reach a few dozen percent in the high transverse momentum area or the central rapidity region of the final Z^(0)-bosons and muons.

关键词： dimensions momentum subsequent

Next-to-Leading Order QCD Corrections to tt^(ˉ)γ Production at the 7TeV LHC

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Chinese Physics Letters 2011年第11期28卷 76-78页

作者： DUAN Peng-Fei zhang ren-you MA Wen-Gan HAN Liang GUO Lei WANG Shao-Ming Department of Modern Physics University of Science and Technology of ChinaHefei 230026

We present theoretical predictions including the complete next-to-leading order(NLO)QCD corrections to the top quark pair production in association with a photon at the LHC with the center-of-mass system energy of *** uncertainties of the leading order(LO)and NLO QCD corrected cross sections due to the renormalization/factorization scale,and the distributions of the transverse momenta of the final top quark and the photon are ***,we provide the numerical results of the LO,NLO QCD corrected cross sections and the corresponding𝐾-factors with different photon transverse momentum *** also discuss the impact of QCD corrections to the𝑝pp→tt^(ˉ)γ𝛾+X𝑋in the case that there exists an exotic top quark with an electric charge of−4e/3 at the 7TeV LHC.

关键词： quark QCD correction

Inter-well internal resonance analysis of rectangular asymmetric cross-ply bistable composite laminated cantilever shell under transverse foundation excitation

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1353-1370页

作者： Lele ren Wei zhang Yufei zhang State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanics Guangxi UniversityNanning 530004China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures College of Mechanical EngineeringBeijing University of TechnologyBeijing 100124China

The chaotic dynamic snap-through and complex nonlinear vibrations are investigated in a rectangular asymmetric cross-ply bistable composite laminated cantilever shell,in cases of 1:2 inter-well internal resonance and primary *** transverse foundation excitation is applied to the fixed end of the structure,and the other end is in a free *** first-order approximate multiple scales method is employed to perform the perturbation analysis on the dimensionless two-degree-of-freedom ordinary differential motion control *** four-dimensional averaged equations are derived in both polar and rectangular coordinate *** from the obtained frequency-amplitude and force-amplitude response curves,a detailed analysis is conducted to examine the impacts of excitation amplitude,damping coefficient,and tuning parameter on the nonlinear internal resonance characteristics of the *** nonlinear softening characteristic is exhibited in the upper stable-state,while the lower stable-state demonstrates the softening and linearity *** simulation is carried out using the fourth-order Runge-Kutta method,and a series of nonlinear response curves are *** the excitation amplitude further elucidates the global bifurcation and chaotic dynamic snap-through characteristics of the bistable cantilever shell.

关键词： bistable composite laminated cantilever shell inter-well internal resonance primary resonance chaotic dynamic snap-through complex nonlinear vibration

Hollow FeCoNiAl microspheres with stabilized magnetic properties for microwave absorption

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Nano Research 2024年第3期17卷 2079-2087页

作者： Linhe Yu Gangjie Lian Guozhen Zhu Sue ren Yanfang Du Xuhui Xiong Rui Chen Jincang zhang Wenbin you renchao Che Institute of Advanced Materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Zhejiang Laboratory Hangzhou 311100China Capital Aerospace Machinery Corporation Limited Beijing 100000China AECC Beijing Institute of Aeronautical Materials Beijing 100095China International Center for Quantum and Molecular Structures Materials Genome InstitutePhysics DepartmentShanghai UniversityShanghai 200444China

Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains ***,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic *** alloy components is considered an effective way to solve the aforementioned ***,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient *** exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption ***,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis ***,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.

关键词： microwave absorption hollow structure magnetic stability multiple microwave absorption mechanism