摘要 :
We review the status of the theoretical and experimental determinations of the muon magnetic moment anomaly, a_μ = (g_μ - 2)/2. We discuss future experimental efforts, as well as implications for physics beyond the Standard Mode...
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We review the status of the theoretical and experimental determinations of the muon magnetic moment anomaly, a_μ = (g_μ - 2)/2. We discuss future experimental efforts, as well as implications for physics beyond the Standard Model that come from past and future experiments.
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摘要 :
BLMSSM is introduced as a supersymmetric extension of the Standard Model (SM), where local gauged baryon number B and lepton number L are considered. Extending BLMSSM with exotic Higgs superfields (phi(NL), phi(NL)) and superfield...
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BLMSSM is introduced as a supersymmetric extension of the Standard Model (SM), where local gauged baryon number B and lepton number L are considered. Extending BLMSSM with exotic Higgs superfields (phi(NL), phi(NL)) and superfields (Y, Y '), one obtains the new model called EBLMSSM, where exotic leptons are heavy enough and have tree level couplings with the SM leptons. In this model, some new parameters with CP-violating phases are considered, so there are new contributions to lepton anomalous magnetic dipole moments (MDMs) and electric dipole moments (EDMs). Therefore, we study the one-loop, two-loop Barr-Zee and two-loop Rainbow type corrections to lepton MDMs and EDMs in the EBLMSSM. Considering the constraints from the lightest CP-even Higgs mass and decays, we discuss the numerical results of lepton MDMs and EDMs. In our used parameter space, the new physics contributions to lepton MDMs are large, which can remedy the deviation between the SM prediction and experimental result well. New introduced CP-violating phases also affect the lepton EDMs in a certain degree.
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The effect of the neutrino dipole magnetic moment on the properties of the muon is investigated within the standard model of electroweak interactions and a model based on the SU(2)_L x SU (2)R x U(1)_(R-L) gauge group (left-right ...
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The effect of the neutrino dipole magnetic moment on the properties of the muon is investigated within the standard model of electroweak interactions and a model based on the SU(2)_L x SU (2)R x U(1)_(R-L) gauge group (left-right model). In the case of the Dirac neutrino, muon decay through the channel μ~→ e~- γ is studied with allowance for the neutrino dipole magnetic moment. It is shown that, both in the standard model supplemented with an SU(2)L right-handed neutrino singlet and in the standard model featuring two doublets of Higgs fields, radiative muon decay is unobservable. In the left-right model, the contributions of diagrams associated with the neutrino dipole magnetic moment become significant only in the case of a mutual compensation of the contributions of diagrams involving the electromagnetic vertices of charged gauge bosons and singly charged Higgs bosons. At specific values of the parameters of the left-right model, one can then obtain an experimental upper limit on the branching fraction of this reaction. The contributions of the neutrino dipole magnetic moment to the muon anomalous magnetic moment are found for the Dirac and the Majorana neutrino. It is established that, both in the standard model and in the left-right model, values of the neutrino anomalous magnetic moment that are required for explaining the (g - 2)μ, anomaly are in excess of the theoretical predictions for this moment.
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The instrumentations for the measurement ofmagnetization vector m(r, t) and the methods for interpretingthese measurements are described. Some special methods forevaluating magnetization process are also introduced.
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Refractive indices of benzothiazolyl and benzimidazolyl derivatives with different concentration in binary liquid mixture such as acetone-water, Dioxane-water & DMSO-water at 35± 0 1 °C were measured by Abbe's refractometer The data obtained was utilized to calculate molar polarization & electric dipole moment which explain solute-solvent interactions The magnetic susceptibility and magnetic dipole moment calculated by using Gouy's method...
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Refractive indices of benzothiazolyl and benzimidazolyl derivatives with different concentration in binary liquid mixture such as acetone-water, Dioxane-water & DMSO-water at 35± 0 1 °C were measured by Abbe's refractometer The data obtained was utilized to calculate molar polarization & electric dipole moment which explain solute-solvent interactions The magnetic susceptibility and magnetic dipole moment calculated by using Gouy's method
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The experimental precision of the anomalous magnetic moment of the muon has been improved to 0.5 part-per-million by the Brookhaven E821 experiment, similar to the theoretical uncertainty. In the same experiment, a new limit on th...
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The experimental precision of the anomalous magnetic moment of the muon has been improved to 0.5 part-per-million by the Brookhaven E821 experiment, similar to the theoretical uncertainty. In the same experiment, a new limit on the electric dipole moment of 2.8 x 10(-19) e-cm (95% CL) was set. The experiment and plans to improve them are described.
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In several frameworks for leptons sectors of Two Higgs Doublet Models, we calculate the magnetic dipole moment for different flavor types of neutrino. Computations are carried out by assuming a normal hierarchy for neutrino masses...
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In several frameworks for leptons sectors of Two Higgs Doublet Models, we calculate the magnetic dipole moment for different flavor types of neutrino. Computations are carried out by assuming a normal hierarchy for neutrino masses, and analyzing the process v -> v gamma with a charged Higgs boson into the loop. The analysis was performed by sweeping the charged Higgs mass and taking into account the experimental constraints for relevant parameters in Two Higgs Doublet Models with and without flavor changing neutral currents; obtaining magnetic dipole moments close to the experimental thresholds for tau neutrinos in type II and lepton-specific cases. In the neutrino-specific scenario, the contribution of new physics could be sizeable to the current measurement for flavor magnetic dipole moment. This fact leads to excluding possible zones in the parameter space of charged Higgs mass and vacuum expectation value of the second doublet.
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The explanation of the nucleon’s resonance spectrum is a long standing challenge. Magnetic moments of resonances are a valuable testing ground for baryon structure calculations. We have shown in a former experiment that the extra...
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The explanation of the nucleon’s resonance spectrum is a long standing challenge. Magnetic moments of resonances are a valuable testing ground for baryon structure calculations. We have shown in a former experiment that the extraction of the Δ+(1232) magnetic dipole moment is feasible via the measurement and analysis of the reaction γp→π0γ′p, in which the photon γ′ carries the desired information. Such an experiment has been repeated with high precision using the Crystal Ball and TAPS detectors at the MAMI accelerator facility. Preliminary results will be presented. Furthermore, the perspectives for accessing the magnetic moment of the S11(1535) resonance in radiative η photoproduction γp→ηγ′p will be discussed.
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Using the quark-like model, we have improved the existing deviation between theoretical and experimental values of magnetic dipole moment of deuteron. Based upon Pauli Exclusion Principle, the constituent quarks form a ground stat...
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Using the quark-like model, we have improved the existing deviation between theoretical and experimental values of magnetic dipole moment of deuteron. Based upon Pauli Exclusion Principle, the constituent quarks form a ground state for l = 0. The expectation value of the deuteron magnetic dipole moment operator is determined to be equal to 0.861 597 8μ_N in better agreement with the measured value of 0.857 437 6μ_N as compared to the shell model calculations.
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