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Search Results: 1 - 10 of 120143 matches for " T. Kobayashi "
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Datos actuales sobre el sistema de cocción de clínker I.H.I. - S.F.
Kobayashi, T.
Materiales de Construccion , 1977,
Abstract: En este artículo tenemos la ocasión de informar acerca de una nueva técnica en el campo de la producción de clínker de cemento, que ha sido desarrollada por Ishikawajima- Harima Heavy Industries y es conocida como el sistema I.H.I.-S.F.
Selection Rules for Nonrenormalizable Couplings in Superstring Theories
T. Kobayashi
Physics , 1995, DOI: 10.1016/0370-2693(95)00643-Y
Abstract: We study nonrenormalizable coupling terms in $Z_N$ orbifold models. Nontrivial selection rules of couplings are provided and cannot be understood in terms of a simple symmetry of effective field theories. We also discuss phenomenological implications of theses selection rules for the quark mass matrices.
Minimal String Unification and Yukawa Couplings in Orbifold Models
T. Kobayashi
Physics , 1994, DOI: 10.1142/S0217751X9500067X
Abstract: We study the minimal supersymmetric standard model derived from $Z_N \times Z_M$ orbifold models. Moduli dependent threshold corrections of the gauge couplings are investigated to explain the measured values of the coupling constants. Also we study Yukawa couplings of the models. We find that the $Z_2 \times Z_6'$, $Z_2\times Z_6$, $Z_3 \times Z_6$ and $Z_6 \times Z_6$ orbifold models have the possibility to derive Yukawa couplings for the second and third generations as well as the measured gauge coupling constants. Allowed models are shown explicitly by combinations of modular weights for the matter fields.
Minimal String Unification and Hidden Sector in Z_8 Orbifold Models
T. Kobayashi
Physics , 1993, DOI: 10.1016/0370-2693(94)91315-3
Abstract: We study the minimal supersymmetric standard model derived from the $Z_8$ orbifold models and its hidden sectors. We use a target-space duality anomaly cancellation so as to investigate hidden sectors consistent with the MSSM unification. For the allowed hidden sectors, we estimate the running gauge coupling constants making use of threshold corrections due to the higher massive modes. The calculation is important from the viewpoint of gaugino condensations, which is one of the most promissing mechanism to break the supersymmetry.
Quark Mass Matrices in Orbifold Models
T. Kobayashi
Physics , 1995, DOI: 10.1016/0370-2693(95)01006-C
Abstract: We study left-right symmetric quark mass matrices whose up- and down-sectors have the same structure. This type of realistic mass matrices are derived from orbifold models. We cannot derive some of them by using an extra U(1) symmetry.
Quantum Mechanical Description of A Quasi-Sratic Process and An Application to Change of Temperatures
T. Kobayashi
Physics , 2001,
Abstract: A quasi-static process is realized in a purely quantum-mechanical model which is described by oscillator (or particle) systems having relative-phase interactions. Time development of a mixture of two oscillator (or particle) systems which have different temperatures is investigated in the quantum mechanical framework. We study how they go to a thermal equilibrium. Time dependence of the temperature of the object is numerically studied and the difference of the time dependence between classical objects and quantum objects is clearly pointed out.
Statistical Mechanics for States with Complex Eigenvalues and Quasi-stable Semiclassical Systems
T. Kobayashi,T. Shimbori
Physics , 2000,
Abstract: Statistical mechanics for states with complex eigenvalues, which are described by Gel'fand triplet and represent unstable states like resonances, are discussed on the basis of principle of equal ${\it a priori}$ probability. A new entropy corresponding to the freedom for the imaginary eigenvalues appears in the theory. In equilibriums it induces a new physical observable which can be identified as a common time scale. It is remarkable that in spaces with more than 2 dimensions we find out existence of stable and quasi-stable systems, even though all constituents are unstable. In such systems all constituents are connected by stationary flows which are generally observable and then we can say that they are semiclassical systems. Examples for such semiclassical systems are constructed in parabolic potential barriers. The flexible structure of the systems is also pointed out.
Stops in R-parity Breaking Model for High-$Q^2$ Events at HERA
T. Kon,T. Kobayashi
Physics , 1997, DOI: 10.1016/S0370-2693(97)00922-2
Abstract: We investigate an event excess in the reaction $e^+p \to e^+ X$ with large $x$ and high $Q^2$ observed at HERA and show that the events could naturally be interpreted as a signature of the production of the scalar top quarks (stops) in a supersymmetric model with $R$-parity breaking interactions. The HERA events are characterized by the broad mass distribution and in fact it can be simulated by our specific scenario if we consider almost degenerate two mass eigenstates $\tilde{t_1}$ and $\tilde{t_2}$ of the stops.
Vibrational dynamics resolved with sub-10-fs deep-ultraviolet pulses
Kobayashi T.,Kida Y.
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134105002
Abstract: Time-resolved ultrafast spectroscopy with sub-10-fs deep ultraviolet pulses was demonstrated for the first time. For the spectroscopy, the sub-10-fs pulses with smooth temporal and spectral profiles, which were suitable for spectroscopy, were prepared via the method of the broadband chirped-pulse four-wave mixing. The vibrational and electronically excited state dynamics in the aqueous solution of thymine were investigated with a sub-10-fs resolution. Vibrational wavepackets originating from the electronically excited state and ground state were observed simultaneously. Through this research, it was shown that the sub-10-fs pulses were successfully applied to the ultrafast spectroscopy, opening the door to the new research activity of ultrafast spectroscopy with a sub-10-fs time resolution in the deep ultraviolet.
Implications of Non-universal Soft Masses on Gauge Coupling Unification
R. Altendorfer,T. Kobayashi
Physics , 1995, DOI: 10.1142/S0217751X96000419
Abstract: We study the gauge coupling unification of the minimal supersymmetric standard model with non-universal soft scalar and gaugino masses. The unification scale of the gauge couplings is estimated for non-universal cases. It is sensitive to the non-universality. It turns out that these cases can be combined with the assumption of string unification, which leads to a prediction of $\sin^2 \theta_W(M_Z)$ and $k_1$, the normalisation of the $U(1)_Y$ generator. String unification predicts $k_1=1.3 - 1.4$. These values have non-trivial implications on string model building. Two-loop corrections are also calculated. Some of these cases exhibit a large discrepancy between experiment and string unification. We calculate string threshold corrections to explain the discrepancy.
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