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MSSM Neutral Higgs Production Cross Section Via Gluon Fusion and Bottom Quark Fusion at NNLO in QCD
Issue:
Volume 2, Issue 1, January 2013
Pages:
1-6
Received:
29 December 2012
Abstract: MSSM Higgs production cross section in bottom-quark annihilation is evaluated at next-to-next-to-leading order (NNLO) in QCD. Scale dependence for both the factorization and renormalization scales for center of mass energies 7, 8 TeV was found. With the help of computer program HIGLU the neutral MSSM Higgs production cross section via gluon fusion at LHC with center of mass energies 7, 8, 14 TeV including next-to-next-to-leading order QCD corrections is presented. The result for neutral Higgs boson mass is in accordance with the last experimental data received at the LHC.
Abstract: MSSM Higgs production cross section in bottom-quark annihilation is evaluated at next-to-next-to-leading order (NNLO) in QCD. Scale dependence for both the factorization and renormalization scales for center of mass energies 7, 8 TeV was found. With the help of computer program HIGLU the neutral MSSM Higgs production cross section via gluon fusion ...
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Rayleigh Waves in a Non-Homogeneous, Thermo, Magneto, Prestressed Granular Material with Variable Density under the Effect of Gravity
Rajneesh Kakar,
Shikha Kakar
Issue:
Volume 2, Issue 1, January 2013
Pages:
7-20
Received:
20 December 2012
Abstract: The effect of various inhomogeneity factors on propagation of Rayleigh waves in prestressed elastic granular medium are investigated. Inhomogeneities have been assumed to vary exponentially with depth. Lame’s potential is used to solve the problem. Some special cases have also been deduced. Dispersion curves are computed numerically and presented graphically by using MathCAD. The results indicate that on neglecting various effects of inhomogeneity, initial stress and gravity, the calculations agrees with classical theories.
Abstract: The effect of various inhomogeneity factors on propagation of Rayleigh waves in prestressed elastic granular medium are investigated. Inhomogeneities have been assumed to vary exponentially with depth. Lame’s potential is used to solve the problem. Some special cases have also been deduced. Dispersion curves are computed numerically and presented g...
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A Method for Analyzing Physical Processes at the Vortex Front in High-Temperature Superconductors
Issue:
Volume 2, Issue 1, January 2013
Pages:
21-33
Published:
10 January 2013
Abstract: A method of simultaneous analysis of the magnetic and crystalline microstates of superconductors is proposed to find out the specific features of interaction between the crystalline and magnetic microstructures of polycrystalline HTSCs. Qualitatively new results are obtained for samples with different microstructures. For example, regular steps are observed on the magnetic-field dependence of the trapped magnetic flux density Btr(H0) in polycrystalline and epitaxial YBCO films for both increasing and decreasing field. The results of the analysis imply that epitaxial films, as well as bulk and film polycrystalline HTSCs, are "decomposed" into monodomains, crystallites, and subcrystallites with different demagnetization factors. The simultaneous penetration of vortices into crystallites of about the same size and into more regularly arranged subcrystallites gives rise to the above-mentioned steps. As the quality of the samples increases, these steps become more prominent, which is attributed to the enhanced short-range ordering. The absence of steps on Btr(H0) in bulk polycrystalline samples clearly demonstrates the absence of long-range ordering in these samples. It is the vitreousness of the crystalline microstructure of HTSCs that is responsible for the transformations in the vortex system. The similarity of the results obtained in samples with different microstructures points to the universal mechanism of penetration, distribution, and trapping of magnetic flux in these samples. It is found that polycrystalline HTSCs are in fact multistep, rather than two-step, systems. It is shown that the vitreousness of the microstructure of HTSCs and the dense arrangement of twinning boundaries lead to the penetration of magnetic flux in the form of hypervortices into samples and are responsible for the formation of a superconducting glass state on physical principles different from those of the Ebner--Strode model of granulated glass.
Abstract: A method of simultaneous analysis of the magnetic and crystalline microstates of superconductors is proposed to find out the specific features of interaction between the crystalline and magnetic microstructures of polycrystalline HTSCs. Qualitatively new results are obtained for samples with different microstructures. For example, regular steps are...
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Depolarization of the Resonance Line of C4+ due to the Electron Beam Density Effect
Issue:
Volume 2, Issue 1, January 2013
Pages:
34-37
Published:
10 January 2013
Abstract: We investigate theoretically the linear polarization of the Helium-like resonance line 1s2p 1P1 1s2 1S0 emitted from C4+ ions using a steady-state collisional-radiative model, taking into account both the excitation from the ground level 1s2 1S0 and the metastable level 1s2s 1S0 in the population of the 1s2p 1P1 upper level of the resonance line. We analyze the behavior of the linear polarization of the resonance line with respect to the electron density in a wide range varying from 1011 to 1017 cm-3 and for three specific energies of the electron beam. Our results show that when the electron density is sufficiently high, the excitation 1s2s 1S0 1s2p 1P1 provide a significant contribution to the population rate of 1s2p 1P1 level which lead to an important depolarization of the resonance line.
Abstract: We investigate theoretically the linear polarization of the Helium-like resonance line 1s2p 1P1 1s2 1S0 emitted from C4+ ions using a steady-state collisional-radiative model, taking into account both the excitation from the ground level 1s2 1S0 and the metastable level 1s2s 1S0 in the population of the 1s2p 1P1 upper level of the resonance line. ...
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