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eμ Production in R-Parity Violating Supersymmetric Model at Hadron Colliders
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作者 WANG Shao-Ming HAN Liang MA Wen-Gan ZHANG Ren-You JIANG Yi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第3X期491-501,共11页
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... 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. 展开更多
关键词 R-parity violating supersymmetric model QCD corrections
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The Top-Charm Associated Production Within the R-Parity Violating Supersymmetric Model in Photon-Proton Collisions
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作者 HOUHong-sheng MAWen-Gan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期337-346,共10页
The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within t... The top-charm associated production with the effects from both B- and L-violating interactions in TeV scale photon-proton collisions is investigated in the framework of minimal supersymmetric standard model. Within the bounds on the relevant R-parity violating couplings, the total cross section will reach the order of 10 fb in some parts of the parameter space. 展开更多
关键词 R-parity violation minimal supersymmetric standard model flavor changing neutral current
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R-Parity Violation Effects on b_1 → bχ_1~0 in Minimal SupersymmetricStandard Model
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作者 ZHANGRen-You MAWen-Gan +2 位作者 JIANGYi HOUHong-Sheng SUNYan-Bin 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第2期257-267,共11页
We investigate in detail the effects of R-parity lepton number violation onthe decay b_1 → bχ_1~0 in the R-parity violating minimal supersymmetric standard model (R_p-MSSM)under the present experimental constraints ... We investigate in detail the effects of R-parity lepton number violation onthe decay b_1 → bχ_1~0 in the R-parity violating minimal supersymmetric standard model (R_p-MSSM)under the present experimental constraints on R_p parameters. In our numerical calculations weconsider two cases of input parameters of the squark and slepton sectors, M_(squark) 【 M_(slepton)and M_(squark) 】 M_(slepton), for comparison. The results show that the relative R-parity violatingcorrection is not very sensitive to the mass of the lightest neutralino bχ_1~0 the degenerateR-parity violating coupling parameter λ′_2 but strongly depends on M_(squark), M_(slepton) tan βand tie degenerate R-parity violating coupling parameter λ′_1. The relative correction is about -4~ 3% and can exceed -6% in some region of parameter space. Therefore, precise experiment analyseson the decay b_1 → bχ_1~0 may provide a probe of the R-parity violation. 展开更多
关键词 minimal supersymmetric standard model R-parity violation
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Exploration of heavy Higgs bosons at a 100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model
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作者 Kun Wang Pengfu Tian Jingya Zhu 《Chinese Physics C》 SCIE CAS CSCD 2024年第9期107-117,共11页
In this study,we explore the detectability of heavy Higgs bosons in the pp→bbH/A→bbtt channel at a100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model.We calculate their ... In this study,we explore the detectability of heavy Higgs bosons in the pp→bbH/A→bbtt channel at a100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model.We calculate their production cross sections and decay branching ratios and compare them with simulation results from literature.We focus on the heavy doublet-dominated CP-even Higgs H and CP-odd Higgs A,with mass limits set below 10TeV to ensure detectability.At a collider with an integrated luminosity of 3 ab^(-1),the potential for detecting heavy Higgs bosons varies significantly with their mass and tanβ.Heavy Higgs bosons with masses below 2 TeV are within the testable range,while those heavier than 7 TeV are below the exclusion and discovery thresholds,rendering them undetectable.For masses between 2 and 7 TeV,heavy Higgs bosons with tanβ smaller than 20 can be detected,whereas those with tanβ larger than 20 are beyond the current discovery or exclusion capabilities. 展开更多
关键词 next-to-minimal supersymmetric standard model heavy Higgs boson 100 TeV hadron collider
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Effects of Complex Parameters on t→ch^0 in Supersymmetric QCD
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作者 XINGLi-Rong MAWen-Gan ZHANGReu-You SUNYan-Bin HOUHong-Sheng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第2期241-246,共6页
We investigate the leading SUSY-QCD contributions to the branch ratio (BR) oft→ch~0 within the context of the minimal supersymmetric standard model (MSSM) with complex parameters,assuming more generally that there is... We investigate the leading SUSY-QCD contributions to the branch ratio (BR) oft→ch~0 within the context of the minimal supersymmetric standard model (MSSM) with complex parameters,assuming more generally that there is a misalignment between the squark and quark that leads to a flavor non-diagonal squark mass matrix.We introduce complex phases only in μ and At,namely φ_μ and φ_(Aq),for simplicity,and study the dependence of the BR of t→ch~0 on these phase parameters.Our calculations show that these CP-violation phases and the flavor mixing parameter λ influence the BR oft→ch~0 considerably,and the effect induced by φ_(At) is much larger than that by φ_μ and φ_(Ac(?)u.For different values of the complex parameters μ and A_t that are set in this paper,the BR of t -+ ch~ is in the range of 10~(-7)~10~(-6),depending mainly on the value of the trilinear coupling A_t. 展开更多
关键词 flavor changing rare decay SUSY-QCD minimal supersymmetric standard model complex parameters
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Influence of low-energy supersymmetric vector-like quirk particles on W mass increment and muon g–2 anomaly
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作者 周平 《Chinese Physics C》 SCIE CAS CSCD 2024年第3期39-45,共7页
In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We... In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses. 展开更多
关键词 low-energy supersymmetric vector-like quirk models W mass increment muon g-2 anomaly
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Effects of R-Parity Violating Supersymmetry in Top Pair Production at Linear Colliders with Polarized Beams
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作者 WANG Xue-Lei LI Ji-Tao LIU Su-Zhen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第5X期891-894,共4页
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 e... 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. 展开更多
关键词 linear colliders minimal supersymmetric model top quark R-PARITY
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Four-family N = 1 supersymmetric Pati-Salam models from intersecting D6-branes 被引量:1
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作者 Tianjun Li Rui Sun Chi Zhang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第6期39-60,共22页
We investigate the construction of four-family N= 1 supersymmetric Pati-Salam models from Type IIA T^(6)×Z_(2) Z_(2) orientifold with intersecting D6-branes. Utilizing the deterministic algorithm introduced in He... We investigate the construction of four-family N= 1 supersymmetric Pati-Salam models from Type IIA T^(6)×Z_(2) Z_(2) orientifold with intersecting D6-branes. Utilizing the deterministic algorithm introduced in He W, Li T and Sun R(2021 ar Xiv: hep-th/2112.09632), we obtain 274 types of models with three rectangular tori and distinct gauge coupling relations at string scale,while 6 types of models with two rectangular tori and one tilted torus. In both cases, there exists a class of models with gauge coupling unification at string scale. In particular, for the models with two rectangular tori, one tilted torus and gauge coupling unification, the gaugino condensations are allowed, and thus supersymmetry breaking and moduli stabilization are possible for further phenomenological study. 展开更多
关键词 supersymmetric Pati-Salam models intersecting D6-branes brane model building
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Study of diphoton decays of the lightest scalar Higgs boson in the Next-to-Minimal Supersymmetric Standard Model
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作者 范嘉伟 陶军全 +6 位作者 沈玉乔 陈国明 陈和生 S.Gascon-Shotkin M.Lethuillier L.Sgandurra P.Soulet 《Chinese Physics C》 SCIE CAS CSCD 2014年第7期1-8,共8页
The CMS and ATLAS experiments at the LHC have announced the discovery of a Higgs boson with mass at approximately 125 GeV/c2 in the search for the Standard Model Higgs boson via, notably, the 2/y and ZZ to four lepton... The CMS and ATLAS experiments at the LHC have announced the discovery of a Higgs boson with mass at approximately 125 GeV/c2 in the search for the Standard Model Higgs boson via, notably, the 2/y and ZZ to four leptons final states. Considering the recent results of the Higgs boson searches from the LHC, we study the lightest scalar Higgs boson hi in the Next-to-Minimal Supersymmetric Standard Model by restricting the next-to- lightest scalar Higgs boson h2 to be the observed to the 125 GeV/c2 state. We perform a scan over the relevant NMSSM parameter space that is favoured by low fine-tuning considerations. Moreover, we also take the experimental constraints from direct searches, B-physics observables, relic density, and anomalous magnetic moment of the muon measurements, as well as the theoretical considerations, into account in our specific scan. We find that the signal rate in the two-photon final state for the NMSSM Higgs boson hi with the mass range from about 80 GeV/e2 to about 122 CeV/c2 can be enhanced by a factor of up to 3.5 when the Higgs boson h2 is required to be compatible with the excess from latest LHC results. This motivates the extension of the search at the LHC for the Higgs boson hi in the diphoton final state down to masses of 80 GeV/c2, particularly with the upcoming proton-proton collision data to be taken at center-of-mass energies of 13-14 TeV. 展开更多
关键词 SUPERSYMMETRY Next-to-Minimal supersymmetric Standard model lightest scalar Higgs boson
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Search for a lighter Higgs boson in the Next-to-Minimal Supersymmetric Standard Model
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作者 Jun-Quan Tao M.Aamir Shahzad +7 位作者 Si-Jing Zhang Chu Wang Yu-Qiao Shen Guo-Ming Chen He-Sheng Chen S.Gascon-Shotkina L.Finco C.Camen 《Chinese Physics C》 SCIE CAS CSCD 2018年第10期51-58,共8页
Following the discovery of the Higgs boson with a mass of approximately 125 GeV at the LHC, many studies have been performed from both the theoretical and experimental viewpoints to search for a new Higgs Boson that i... Following the discovery of the Higgs boson with a mass of approximately 125 GeV at the LHC, many studies have been performed from both the theoretical and experimental viewpoints to search for a new Higgs Boson that is lighter than 125 GeV. We explore the possibility of constraining a lighter neutral scalar Higgs boson hi and a lighter pseudo-scalar Higgs boson al in the Next-to-Minimal Supersymmetric Standard Model by restricting the next-to-lightest scalar Higgs boson h2 to be the one observed at the LHC after applying the phenomenological constraints and those from experimental measurements. Such lighter particles are not yet completely excluded by the latest results of the search for a lighter Higgs boson in the diphoton decay channel from LHC data. Our results show that some new constraints on the Next-to-Minimal Supersymmetric Standard Model could be obtained for a lighter scalar Higgs boson at the LHC if such a search is performed by experimental collaborations and more data. The potentials of discovery for other interesting decay channels of such a lighter neutral scalar or pseudo-scalar particle are also discussed. 展开更多
关键词 Next-to-Minimal supersymmetric Standard model lighter Higgs boson discovery potentials
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B→ X8γ, X8l+l- Decays and Constraints on Mass Insertion Parameters in MSSM
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作者 XIAO Zhen-Jun LI Feng-Ying ZOU Wen-Jun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第4X期687-696,共10页
In this paper, we study the upper bounds on the mass insertion parameters (δAB^q)ij in the minimal super symmetric standard model. We found that the information from the measured branching ratio of B→ X8γ, X8l+l... In this paper, we study the upper bounds on the mass insertion parameters (δAB^q)ij in the minimal super symmetric standard model. We found that the information from the measured branching ratio of B→ X8γ, X8l+l- decay can help us to improve the upper bounds on the mass insertions parameters (δAB^u,d)3j,i3 Some regions allowed by the data of Br(B→ X8γ) are excluded by the requirement of an SM-like C7γ (rnb) imposedby the data of Br(B→ X8γ, X8l+l- ). 展开更多
关键词 B meson decay the minimal supersymmetric standard model mass insertion
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On two-point boundary correlations of the gl(1|1) supersymmetric vertex model
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作者 张陈俊 《Chinese Physics C》 SCIE CAS CSCD 2010年第8期1069-1075,共7页
The gl(1|1) supersymmetric vertex model with domain wall boundary conditions (DWBC) on an N ×N square lattice is considered. We obtain the reduction formulae for the two-point boundary correlation functions ... The gl(1|1) supersymmetric vertex model with domain wall boundary conditions (DWBC) on an N ×N square lattice is considered. We obtain the reduction formulae for the two-point boundary correlation functions of the model. 展开更多
关键词 gl(1|1) supersymmetric vertex model boundary correlation function domain wall boundaryconditions
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Color-kinematics duality and dual conformal symmetry for a four-loop form factor in N=4 SYM
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作者 Guanda Lin Gang Yang Siyuan Zhang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2024年第4期64-71,共8页
We obtain the integrand of full-color four-loop three-point form factor of the stress-tensor supermultiplet in N=4 SYM,based on the color-kinematics(CK)duality and generalized unitarity method.Our result not only mani... We obtain the integrand of full-color four-loop three-point form factor of the stress-tensor supermultiplet in N=4 SYM,based on the color-kinematics(CK)duality and generalized unitarity method.Our result not only manifests all dual Jacobi relations via CK duality but also contains 133 free parameters.This suggests the constructibility of the form factor at even higher loops via CK duality.We also find that the planar form factor has a hidden dual conformal symmetry in the lightlike limit of the operator momentum,which is checked up to four loops. 展开更多
关键词 S-MATRIX supersymmetric model perturbative calculations
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Study on the Effects of the Light CP-odd Higgs via the Leptonic Decays of Pseudoscalar Mesons
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作者 汤亮 柯红卫 李学潜 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第11期732-738,共7页
To explain the anomALously large decay rate of ∑+→p+μ+μ-, it was proposed that a new mechanism where a light CP-odd pseudoscaJar boson of mAo = 214.3 MeV makes a crucial contribution. Later, some authors have s... To explain the anomALously large decay rate of ∑+→p+μ+μ-, it was proposed that a new mechanism where a light CP-odd pseudoscaJar boson of mAo = 214.3 MeV makes a crucial contribution. Later, some authors have studied the transition π0→e+e- and γ→γA10 in terms of the same mechanism and their result indicates that with the suggested mass one cannot fit the data. This discrepancy might be caused by experimental error of ∑+→p+μ+μ- because there were only a few events. Whether the mechanism is a reasonable one motivates us to investigate the transitions π0→e+e-;η(η′)→μ+μ-;ηc→μ+μ-;ηb→τ+τ- within the same framework. It is noted that for π0→ e+ e-, the standard model (SM) prediction is smaller than the data, whereas the experimental central value of η→μ+μ- is also above the SM prediction. It means that there should be extra contributions from other mechanisms and the contribution of A may be a possible one. Theoretically calculating the branching ratios of the concerned modes, we would cheek if we can obtain a univers mass for A10 which reconcile the theoretical predictions and data for all the modes. Unfortunately, we find that it is impossible conclude that the phenomenology does not favor such a to have such a mass with the same coupling|gt|. Therefore we light A10, even though a small window is still open. 展开更多
关键词 supersymmetric Higgs bosons supersymmetric models leptonic decays of pseudoscalar mesons
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Gravitational Waves, baryon asymmetry of the universe and electric dipole moment in the CP-violating NMSSM
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作者 Ligong Bian Huai-Ke Guo Jing Shu 《Chinese Physics C》 SCIE CAS CSCD 2018年第9期56-70,共15页
In this work, we make the first study of electroweak baryogenesis(EWBG) based on the LHC data in the CP-violating next-to-minimal supersymmetric model(NMSSM) where a strongly first order electroweak phase transit... In this work, we make the first study of electroweak baryogenesis(EWBG) based on the LHC data in the CP-violating next-to-minimal supersymmetric model(NMSSM) where a strongly first order electroweak phase transition(EWPT) is obtained in the general complex Higgs potential. With representative benchmark points which pass the current LEP and LHC constraints, we demonstrate the structure of EWPT for those points and how a strongly first order EWPT is obtained in the complex NMSSM where the resulting gravitational wave production properties are found to be within the reaches of future space-based interferometers like BBO and Ultimate-DECIGO. We further calculate the generated baryon asymmetries where the CP violating sources are(1): higgsino-singlino dominated,(2): higgsino-gaugino dominated or(3): from both sources. It is shown that all three representing scenarios could evade the strong constraints set by various electric dipole moments(EDM) searches where cancellations among the EDM contributions occur at the tree level(higgsino-singlino dominated) or loop level(higgsino-gaugino dominated).The 125 GeV SM like Higgs can be either the second lightest neutral Higgs H_2 or the third lightest neutral Higgs H_3. Finally, we comment on the future direct and indirect probe of CPV in the Higgs sector from the collider and EDM experiments. 展开更多
关键词 finite-temperature field theory supersymmetric models electric and magnetic moments
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Pair production of Higgs boson in NMSSM at the LHC with the next-to-lightest C P-even Higgs boson being SM-like
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作者 Zhaoxia Heng Xue Gong Haijing Zhou 《Chinese Physics C》 SCIE CAS CSCD 2018年第7期24-29,共6页
The next-to-minimal supersymmetric standard model (NMSSM) more naturally accommodates a Higgs boson with a mass of approximately 125 GeV than the minimal supersymmetric standard model (MSSM). In this work, we assu... The next-to-minimal supersymmetric standard model (NMSSM) more naturally accommodates a Higgs boson with a mass of approximately 125 GeV than the minimal supersymmetric standard model (MSSM). In this work, we assume that the next-to-lightest CP-even Higgs boson h2 is the SM-like Higgs boson h, whereas the lightest CP-even Higgs boson h1 is dominantly singlet-like. We discuss the h1h1, h2h2, and h1h2 pair production processes via gluon-gluon fusion at the LHC for an collision energy of 14 TeV, and we consider the cases in which one Higgs boson decays to bb and the other decays to γγ or τ+τ-. We find that, for mh1? 62 GeV, the cross section of the gg→h1h1 process is relatively large and maximally reaches 5400 fb, and the production rate of the h1h1→bbτ+τ-final state can reach 1500 fb, which make the detection of this final state possible for future searches of an integrated luminosity of 300 and 3000 fb-1. This is mainly due to the contributions from the resonant production process pp→h2→h1h1 and the relatively large branching ratio of h1→bb and h1→τ+τ-. The cross sections of the pp→h2h2 and pp→h1h2 production processes maximally reach 28 fb and 133 fb, respectively. 展开更多
关键词 next-to-Minimal supersymmetric standard model (NMSSM) SM-like Higgs boson Higgs pair production
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