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Search Results: 1 - 10 of 118242 matches for " T. Hayakawa "
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Pseudoscalar pole terms in the hadronic light-by-light scattering contribution to muon $ g - 2 $
M. Hayakawa,T. Kinoshita
Physics , 1997, DOI: 10.1103/PhysRevD.66.019902
Abstract: The pseudoscalar pole contribution is the dominant source of the $ {\cal O}(\alpha^3) $ hadronic light-by-light scattering effect in muon $g - 2$. We have examined this contribution taking account of the off-shell structure of the pseudoscalar-photon-photon anomaly vertex deduced from available experimental data. Our work leads to an improved estimate, $ -79.2 (15.4) \times 10^{-11}$, for the total hadronic light-by-light scattering contribution to the muon $g - 2$.
Hadronic corrections to the muon anomalous magnetic moment from lattice QCD
Blum, T.;Hayakawa, M.;Izubuchi, T.
High Energy Physics - Phenomenology , 2013,
Abstract: After a brief self-contained introduction to the muon anomalous magnetic moment, (g-2), we review the status of lattice calculations of the hadronic vacuum polarization contribution and present first results from lattice QCD for the hadronic light-by-light scattering contribution. The signal for the latter is consistent with model calculations. While encouraging, the statistical error is large and systematic errors are mostly uncontrolled. The method is applied first to pure QED as a check.
Hadronic corrections to the muon anomalous magnetic moment from lattice QCD
T. Blum,M. Hayakawa,T. Izubuchi
Physics , 2013,
Abstract: After a brief self-contained introduction to the muon anomalous magnetic moment, (g-2), we review the status of lattice calculations of the hadronic vacuum polarization contribution and present first results from lattice QCD for the hadronic light-by-light scattering contribution. The signal for the latter is consistent with model calculations. While encouraging, the statistical error is large and systematic errors are mostly uncontrolled. The method is applied first to pure QED as a check.
The effect of earth tides as observed in seismo-electromagnetic precursory signals
M. Hayakawa, Y. Sue,T. Nakamura
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2009,
Abstract: Studies on the effect of earth tides in triggering earthquakes (EQs) had a great progress in recent years, which has provided convincing evidence of earth tides in EQ triggering. On the other hand, there have been accumulated a lot of evidences on the presence of seismogenic electromagnetic effects (such as ULF electromagnetic emissions from the lithosphere, ionospheric perturbations as detected by subionospheric VLF/LF propagation, etc.). Since the initial agent of these seismogenic electromagnetic effects is obviously due to some mechanical action around the EQ focal zone, the tidal effect as seen in EQ sequence should appear also in seismo-electromagnetic phenomena. Based on this expectation we have studied the tidal effect in different seismogenic phenomena, and have found that lithospheric ULF emissions exhibit a clear maximum-minimum-maximum pattern synchronized with the lunar phase of the EQ during several months before the EQ. As for VLF/LF propagation anomaly representing the lower ionospheric perturbation, we have found the tidal modulation very similar to ULF emissions, but less clear, and also there are some differences from the ULF case (such as occasional shift with respect to the lunar phase and/or the presence of higher frequency modulation, etc.). These findings are indicative that those electromagnetic phenomena reported to be in possible association with an EQ are really related with any preparatory phase of an EQ. This kind of study would be a bridge between the seismology and our seismo-electromagnetic study.
Micro-Scale Thermal Imaging of Organic and Polymeric Materials with Cooled and Uncooled Infrared Cameras
J. Morikawa,E. Hayakawa,T. Hashimoto
Advances in Optical Technologies , 2012, DOI: 10.1155/2012/484650
Abstract:
Endoscopic Ultrasonography of the Pancreas: New Advances
Hayakawa T,Jin C X,Hirooka Y
JOP Journal of the Pancreas , 2000,
Abstract:
Micro-Scale Thermal Imaging of Organic and Polymeric Materials with Cooled and Uncooled Infrared Cameras
J. Morikawa,E. Hayakawa,T. Hashimoto
Advances in Optical Technologies , 2012, DOI: 10.1155/2012/484650
Abstract: The emissivity corrected thermal imaging combined with a real-time direct imposed-signal system on the freezing of biological cells is presented, which makes it possible to visualize the exothermic latent heat at a minus temperature. The applicability of the uncooled micro bolometer (thermal detector) to the micro-scale thermal analysis on the phase transitions of organic and polymeric materials is discussed in comparison with the photon detector, equipped with the optics originally designed. 1. Introduction Noncontact thermal imaging methods are preferred in the characterization of materials in the increasing number of applications. Creating and monitoring thermal distributions with a spatial resolution of ~10?μm is required, in particular, for the materials developed in the energy saving and renewable technology [1]. A recent advance in IR detectors arrays provides the enhanced applications [2]. Thermal imaging applied to the materials’ characterization in a micro-scale is summarized with actual imaging results of organic, polymeric, and biological materials, using a cooled and an un-cooled infrared cameras equipped with the optics originally designed in this study. Examples of microscale thermal analysis and the lock-in thermography are presented. The latent heat generation and dissipation at minus temperatures during the freezing of biological cells are visualized that clarifies the thermal diffusion effect on crystallization and the vitrification [3–7]. On-lamellae thermal analysis of n-alkane visualizes the early stage of anisotropic lamella formation and the difference of thermal propagation in crystallizations and the rotator phase transitions [8]. The crystallization front of polymeric spherulite of poly(ethylene oxide) visualizes the temperature rise of ~100?mK [9]. The basic results of lock-in thermography visualize the phase and amplitude image using a method of modulated spot heating with a diode laser that generates a thermal wave inside the specimen [10, 11]. A promising application of micro-bolometer sensor is additionally introduced [12]. 2. Approach and Techniques In order to visualize the material’s thermal phenomena with a spatial resolution ~10?μm and in a time scale ~10?ms, the following techniques have been developed. The measurement is done preferably under the dynamic temperature field such as a constant rate heating/cooling and a temperature modulation. 2.1. Optics Materials for optics suitable to the mid- and long-wave infrared cameras are chosen, respectively. Spatial resolutions 4.3?μm (calculated at ?μm, λ: wavelength) and
Chiral Lagrangian with higher resonances and flavour $ SU(3) $ breaking
M. Hayakawa,T. Kurimoto,A. I. Sanda
Physics , 1993, DOI: 10.1143/PTP.92.377
Abstract: A chiral Lagrangian with $ SU(3) $ breaking and higher resonances is proposed. In this model, the $ SU(3) $ breaking structure in vector-pseudoscalar sector is realized with the decay constants of pseudoscalar mesons and the masses of vector mesons used as inputs. We examine whether the resulting $ SU(3) $ breaking effect in the charge radii of pseudoscalar mesons is consistent with the experimental facts.
Liquid Crystal Analogue of Abrikosov Vortex Flow in Superconductors
A. Tanaka,T. Ota,R. Hayakawa
Physics , 1996,
Abstract: We extend the correspondence between the Renn-Lubensky Twist-Grain-Boundary-A phase in chiral liquid crystals and the Abrikosov mixed state in superconductors to dynamical aspects. We find that for a TGB sample with free boundaries, an external electric field applied along the helical axis induces a uniform translational motion of the grain boundary system - an analogue of the well-known mixed state flux flow. Likewise, an analogue of the mixed state Nernst effect is found. In much the same way in which the flux flow carries intercore electric fields generating Joule heat in an otherwise dissipation-free system, the grain boundary flow carries along polarized charges, resulting in a finite electric conductivity in a ferroelectric.
Hadronic Light-by-light Scattering Contribution to Muon $ g - 2 $
M. Hayakawa,T. Kinoshita,A. I. Sanda
Physics , 1996, DOI: 10.1103/PhysRevD.54.3137
Abstract: The hadronic light-by-light scattering contribution to muon $g-2$ is examined based on the low energy effective theories of QCD, the Nambu-Jona-Lasinio model and hidden local symmetry approach, supplemented by a general information concerning the asymptotic behavior of QCD. Our result is $- 52 \times 10^{-11}$ with an uncertainty of $\pm 18 \times 10^{-11}$, which includes our best estimate of model dependence. This is within the expected measurement uncertainty of $40\times 10^{-11}$ in the forthcoming experiment at Brookhaven National Laboratory. Our result removes one of the main theoretical obstacles in verifying the existence of the weak contribution to the muon $g-2$.
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