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Sep 18, 2013
09/13

by
K. Suzuki

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We study the time-reversal odd quark fragmentation function and its consequences on the hard processes. T-odd quark fragmentation function may arise, although QCD is T-invariant, from the non-perturbative dynamics in the fragmentation process. Assuming the factorization, we extract the T-odd fragmentation function from the inclusive pion production in the transversely polarized proton-proton collision. We then estimate the single spin asymmetry $A_{OT}$ of the semi-inclusive deep inelastic...

Source: http://arxiv.org/abs/hep-ph/0002218v1

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Sep 19, 2013
09/13

by
K. Suzuki

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We study the structure of constituent quarks by dressing bare quarks with the Goldstone bosons and its implications for quark distribution functions of hadrons $f_1(x)$, $g_1(x)$ and $h_1(x)$. In particular we discuss effects of the dressing on the nucleon spin structure, and find that contributions to chiral-odd $h_1(x)$ is quite different from those to $g_1 (x)$, which can be measured in the semi-inclusive polarized deep inelastic scattering.

Source: http://arxiv.org/abs/hep-ph/9709346v1

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Sep 21, 2013
09/13

by
Takeru K. Suzuki

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By explicitly taking into account effects of Alfven waves, I derive from a simple energetics argument a fundamental relation which predicts solar wind (SW) speeds in the vicinity of the earth from physical properties on the sun. Kojima et al. recently found from their observations that a ratio of surface magnetic field strength to an expansion factor of open magnetic flux tubes is a good indicator of the SW speed. I show by using the derived relation that this nice correlation is an evidence of...

Source: http://arxiv.org/abs/astro-ph/0602062v1

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Sep 23, 2013
09/13

by
Takeru K. Suzuki

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In this talk we introduce our recent results of global 1D MHD simulations for the acceleration of solar and stellar winds. We impose transverse photospheric motions corresponding to the granulations, which generate outgoing Alfven waves. The Alfven waves effectively dissipate by 3-wave coupling and direct mode conversion to compressive waves in density-stratified atmosphere. We show that the coronal heating and the solar wind acceleration in the open magnetic field regions are natural...

Source: http://arxiv.org/abs/0801.0050v1

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Sep 23, 2013
09/13

by
Takeru K. Suzuki

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We investigate coronal heating and acceleration of the high- and low-speed solar wind in the open field region by dissipation of fast and slow magnetohydrodynamical (MHD) waves through MHD shocks. Linearly polarized \Alfven (fast MHD) waves and acoustic (slow MHD) waves travelling upwardly along with a magnetic field line eventually form fast switch-on shock trains and hydrodynamical shock trains (N-waves) respectively to heat and accelerate the plasma. We determine one dimensional structure of...

Source: http://arxiv.org/abs/astro-ph/0312573v1

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Sep 20, 2013
09/13

by
Takeru K. Suzuki

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By performing MHD simulations, we investigate the mass loss of intermediate- and low-mass stars from main sequence (MS) to red giant branch (RGB) phases. Alfven waves, which are excited by the surface convections travel outwardly and dissipate by nonlinear processes to accelerate and heat the stellar winds. We dynamically treat these processes in open magnetic field regions from the photospheres to 25 stellar radii. When the stars evolve to slightly blueward positions of the dividing line...

Source: http://arxiv.org/abs/astro-ph/0608195v5

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Sep 21, 2013
09/13

by
Takeru K. Suzuki

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By extending our self-consistent MHD simulations for the solar wind, we study the evolution of stellar winds of solar-type stars from early main sequence stage to red giant phase. Young solar-type stars are active and the mass loss rates are larger by up to ~ 100 times than that of the present-day sun. We investigate how the stellar wind is affected when the magnetic field strength and fluctuation amplitude at the photosphere increase. While the mass loss rate sensitively depends on the input...

Source: http://arxiv.org/abs/1301.2359v1

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Sep 22, 2013
09/13

by
Takeru K. Suzuki

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We review our recent results of Alfven wave-driven winds. First, we present the result of a self-consistent 1D MHD simulations for solar winds from the photosphere to interplanetary region. Here, we emphasize the importance of the reflection of Alfven waves in the density stratified corona and solar winds. We also introduce the recent HINODE observation that might detect the reflection signature of transverse (Alfvenic) waves by Fujimura & Tsuneta (2009). Then, we show the results of Alfven...

Source: http://arxiv.org/abs/1001.2400v1

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Sep 21, 2013
09/13

by
Takeru K. Suzuki

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By using our previous results of magnetohydrodynamical simulations for the solar wind from open flux tubes, I discuss how the solar wind in the past is different from the current solar wind. The simulations are performed in fixed one-dimensional super-radially open magnetic flux tubes by inputing various types of fluctuations from the photosphere, which automatically determines solar wind properties in a forward manner. The three important parameters which determine physical properties of the...

Source: http://arxiv.org/abs/1104.3660v2

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Sep 19, 2013
09/13

by
Y. Unno; K. Suzuki

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We report an improved measurement of the partial-rate CP asymmetry in B+ => K0pi+ and B- => K0bar pi- decays. The analysis is based on a data sample of 85 million BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e+ e- storage ring. We measure Acp(K0pi+-) = 0.07^{+0.09 +0.01}_{-0.08 -0.03}, where the first and second errors are statistical and systematic, respectively; the corresponding 90% confidence-level interval is -0.10 < Acp(K0pi+-) < 0.22 .

Source: http://arxiv.org/abs/hep-ex/0304035v1

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Sep 21, 2013
09/13

by
K. Suzuki; W. Weise

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We investigate the structure of constituent quarks and study implications for quark distribution functions of hadrons. Constituent quarks are constructed by dressing bare quarks with Goldstone bosons using the chiral quark model. We calculate resulting corrections to the twist-2 structure functions $f_1(x)$, $g_1(x)$ and $h_1(x)$. The Goldstone boson fluctuations produce a flavor asymmetry of the quark distribution in the nucleon in agreement with experimental data. They also generate...

Source: http://arxiv.org/abs/hep-ph/9711368v1

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Sep 19, 2013
09/13

by
K. Suzuki; T. Shigetani

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We study the chiral-odd transversity spin-dependent quark distribution function $h_1 (x)$ of the nucleon in a constituent quark model. The twist-2 structure functions, $f_1(x)$, $g_1(x)$ and $h_1(x)$ are calculated within the diquark spectator approximation. Whereas an inequality $f_1(x) > h_1(x) > g_1(x)$ holds with the interaction between quark and diquark being scalar, the axial-vector effective quark-diquark interaction, which contributes to the $d$-quark distribution, does not lead...

Source: http://arxiv.org/abs/hep-ph/9709394v1

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Sep 22, 2013
09/13

by
T. K. Suzuki; S. Inutsuka

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By performing local three-dimensional MHD simulations of stratified accretion disks, we investigate disk winds driven by MHD turbulence. Initially given weak vertical magnetic fields are effectively amplified by magnetorotational instability and winding due to differential rotation. Large scale channel flows develop most effectively at 1.5 - 2 times the scale heights where the magnetic pressure is comparable to but slightly smaller than the gas pressure. The breakup of these channel flows...

Source: http://arxiv.org/abs/0812.0844v2

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Sep 23, 2013
09/13

by
Takeru K. Suzuki; Susumu Inoue

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The energy dissipated by virialization shocks during hierarchical structure formation of the Galaxy can exceed that injected by concomitant supernova (SN) explosions. Cosmic rays (CRs) accelerated by such shocks may therefore dominate over SNe in the production of $^6$Li through $\alpha + \alpha$ fusion without co-producing Be and B. This process can give a more natural account of the observed $^6$Li abundance in metal-poor stars compared to standard SN CR scenarios. Future searches for...

Source: http://arxiv.org/abs/astro-ph/0312574v1

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Sep 18, 2013
09/13

by
K. -I. Kubo; K. Suzuki

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We discuss interplay of the scalar and vector diquarks which decide the characteristics of the spin polarization as functions of $p_T$ and $x_F$ in the wide kinematical range. We demonstrate a significant effect of quark masses on the pair-creation probabilities from vacuum in $pp \to \Sigma^- X$ and $\gamma p \to \Lambda X$ collisions, and also a remarkable correction induced by the diquark form factor in $ \Sigma^- p \to \Lambda X $ collision.

Source: http://arxiv.org/abs/hep-ph/0505179v1

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Jun 26, 2018
06/18

by
Shohei Aoyama; Takeru K. Suzuki

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We investigate the effect of the axion cooling on the nucleosynthesis in a massive star with $16M_{\odot}$ by standard stellar evolution calculation. We find that the axion cooling suppresses the nuclear reactions in carbon, oxygen and silicon burning phases because of the extraction of the energy. As a result, larger amounts of the already synthesized neon and magnesium remain without being consumed to produce further heavier elements. Even in the case with the axion-photon coupling constant...

Topics: Solar and Stellar Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1502.02357

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Sep 24, 2013
09/13

by
Takeru K. Suzuki; Shigehiro Nagataki

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We propose magnetic proto-neutron star (PNS) winds driven by \Alfven waves as well as the neutrino heating as an appropriate site for the r-process nucleosynthesis. \Alfven waves excited by surface motions of a PNS propagate outwardly, and they heat and accelerate the wind by dissipation. Compared with the wind purely driven by the neutrino heating, larger entropy per baryon and shorter dynamical time scale are achieved, which favors the r-process. We study reasonable cases that a wave...

Source: http://arxiv.org/abs/astro-ph/0412362v3

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Jun 30, 2018
06/18

by
Takuma Matsumoto; Takeru K. Suzuki

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We have performed a 2.5 dimensional magnetohydrodynamic simulation that resolves the propagation and dissipation of Alfven waves in the solar atmosphere. Alfvenic fluctuations are introduced on the bottom boundary of the extremely large simulation box that ranges from the photosphere to far above the solar wind acceleration region. Our model is ab initio in the sense that no corona and no wind are assumed initially.The numerical experiment reveals the quasi-steady solution that has the...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1402.0316

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Sep 22, 2013
09/13

by
Takeru K. Suzuki; Susumu Inoue

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While the abundances of Be and B observed in metal-poor halo stars are well explained as resulting from spallation of CNO-enriched cosmic rays (CRs) accelerated by supernova shocks, accounting for the observed $^6$Li in such stars with supernova CRs is more problematic. Here we propose that gravitational shocks induced by infalling and merging sub-Galactic clumps during hierarchical structure formation of the Galaxy should dissipate enough energy at early epochs, and CRs accelerated by such...

Source: http://arxiv.org/abs/astro-ph/0201190v2

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Sep 18, 2013
09/13

by
A. Hayashigaki; K. Suzuki; K. Tanaka

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A first theoretical study for neutrino-induced diffractive productions of heavy pseudoscalar-mesons, \eta_c and \eta_b, off a nucleon is performed based on factorization formalism in QCD. We evaluate the forward diffractive production cross section in perturbative QCD in terms of the light-cone wave functions of Z boson and \eta_{c,b} mesons, and the gluon distribution of the nucleon. The diffractive production of \eta_c is governed by the axial vector coupling of the longitudinally polarized Z...

Source: http://arxiv.org/abs/hep-ph/0212088v1

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Sep 23, 2013
09/13

by
K. Suzuki; T. Shigetani; H. Toki

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The nucleon structure functions are studied with a special emphasis on diquark correlations inside the nucleon. Assuming a phenomenological diquark-quark model of the nucleon at the low energy hadronic scale, we calculate the leading twist contributions to the nucleon structure functions. We take the Nambu and Jona-Lasinio model for the calculation of the quark distributions in the diquarks, and use the convolution method for the diquark scattering process. The resulting quark distributions are...

Source: http://arxiv.org/abs/hep-ph/9310266v1

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Sep 20, 2013
09/13

by
T. Shigetani; K. Suzuki; H. Toki

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We study the deep inelastic structure functions of mesons within the Nambu and Jona-Lasinio model. We calculate the valence quark distributions in $\pi $, $K $, and $\rho $ mesons at the low energy model scale, which are evoluted to the experimental momentum scale in terms of the Altarelli-Parisi equation. The resulting distribution functions show reasonable agreements with experiment. We also discuss the semi-inclusive lepton nucleon scattering process with a slow nucleon in coincidence in the...

Source: http://arxiv.org/abs/hep-ph/9402277v1

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0.0

Jun 30, 2018
06/18

by
Y. Kuno; K. Suzuki; I. Ichinose

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The bosonic t-J model is a strong-on-site repulsion limit of the two-component Bose-Hubbard model and is expected to be realized by experiments of cold atoms in an optical lattice. In previous papers, we studied the bosonic t-J model by both analytical methods and numerical Monte - Carlo (MC) simulations. However, in the case of finite $J_z$, where $J_z$ is the $z$-component coupling constant of the pseudospin interaction, the phase diagram of the model was investigated by assuming the...

Topics: Quantum Gases, Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1402.0284

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Sep 20, 2013
09/13

by
Takeru K. Suzuki; Shu-ichiro Inutsuka

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We show that the coronal heating and the fast solar wind acceleration in the coronal holes are natural consequence of the footpoint fluctuations of the magnetic fields at the photosphere, by performing one-dimensional magnetohydrodynamical simulation with radiative cooling and thermal conduction. We initially set up a static open flux tube with temperature 10^4K rooted at the photosphere. We impose transverse photospheric motions corresponding to the granulations with velocity = 0.7km/s and...

Source: http://arxiv.org/abs/astro-ph/0506639v4

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Sep 22, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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A method for a microscopic description of Lambda hypernuclei is formulated in the framework of the unitary-model-operator approach. A unitarily transformed hamiltonian is introduced and given in a cluster expansion form. The structure of three-body-cluster terms are discussed especially on the Lambda single-particle energy. The Lambda single-particle energies including the three-body-cluster contributions are calculated for the 0s_{1/2}, 0p_{3/2} and 0p_{1/2} states in_{Lambda}^{17}O, and for...

Source: http://arxiv.org/abs/nucl-th/0003001v1

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Sep 19, 2013
09/13

by
Pin-Gao Gu; Takeru K. Suzuki

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We investigate the thermal response of the atmosphere of a solar-type star to an electron beam injected from a hot Jupiter by performing a 1-dimensional magnetohydrodynamic numerical experiment with non-linear wave dissipation, radiative cooling, and thermal conduction. In our experiment, the stellar atmosphere is non-rotating and is modelled as a 1-D open flux tube expanding super-radially from the stellar photosphere to the planet. An electron beam is assumed to be generated from the...

Source: http://arxiv.org/abs/0909.4602v1

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Sep 22, 2013
09/13

by
R. Okamoto; S. Fujii; K. Suzuki

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A general definition of the model-space effective interaction is given. The energy-independent effective hamiltonians derived in a time-independent way are classified systematically.

Source: http://arxiv.org/abs/nucl-th/0501081v1

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Jun 30, 2018
06/18

by
Y. Kuno; K. Suzuki; I. Ichinose

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In this paper, we study an extended bosonic t-J model in an optical lattice, which describes two-component hard-core bosons with a nearest-neighbor (NN) pseudo-spin interaction, and also inter- and intra-species dipole-dipole interactions (DDI). In particular, we focus on the case in which two component hard-core bosons have anti-parallel polarized dipoles with each other. The global phase diagram is studied by means of the Gutzwiller variational method and also the quantum Monte-Carlo...

Topics: Quantum Gases, Superconductivity, Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1410.2403

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Sep 21, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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The binding energies of the ground states and several excited states related to single-particle and -hole states in nuclei around ^{16}O are calculated taking charge dependence into account. Effective interactions on the particle basis are constructed from modern charge-dependent nucleon-nucleon interactions and the Coulomb force within the framework of the unitary-model-operator approach. Single-particle (-hole) energies are obtained from the energy differences of the binding energies between...

Source: http://arxiv.org/abs/nucl-th/0311053v1

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Sep 21, 2013
09/13

by
Takeru K. Suzuki; Shu-ichiro Inutsuka

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We show that the coronal heating and the acceleration of the fast solar wind in the coronal holes are natural consequence of the footpoint fluctuations of the magnetic fields at the photosphere by one-dimensional, time-dependent, and nonlinear magnetohydrodynamical simulation with radiative cooling and thermal conduction. We impose low-frequency (

Source: http://arxiv.org/abs/astro-ph/0508568v3

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Sep 19, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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Shell-model calculations in a large model space are performed for _{\Lambda}^{16}O and_{\Lambda}^{17}O. Effective interactions with degrees of freedom of \Sigma in addition to \Lambda and nucleons are derived from hyperon-nucleon and nucleon-nucleon interactions within the framework of the unitary-model-operator approach. Effects of the \Sigma degrees of freedom and the parity-mixing intershell coupling on the \Lambda hypernuclear structure are investigated, employing the Nijmegen NSC97a-f and...

Source: http://arxiv.org/abs/nucl-th/0206012v1

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Sep 23, 2013
09/13

by
Takeru K. Suzuki; Shu-ichiro Inutsuka

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(abridged) We investigate how the properties of the corona and solar wind in the open coronal holes depend on the properties of the magnetic fields and their footpoint motions at the surface, by perfoming 1D MHD simulations from the photosphere to 0.3 or 0.1AU. We impose low-frequency ( 10^6K by the dissipation of the Alfven waves through compressive-wave generation and wave reflection in the case of the sufficient wave input with photospheric amplitude, > 0.7km/s. The density, and...

Source: http://arxiv.org/abs/astro-ph/0511006v8

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Sep 18, 2013
09/13

by
A. Hayashigaki; K. Suzuki; K. Tanaka

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We report a first theoretical study for neutrino-induced diffractive productions of heavy pseudoscalar mesons, \eta_c and \eta_b, off a nucleon. Based on factorization formalism for exclusive processes, we evaluate the forward diffractive production cross section in perturbative QCD in terms of the light-cone Q\bar{Q} wave functions (WFs) of \eta_{c,b} mesons and the gluon distribution of the nucleon. The light-cone WFs of the \eta_c (\eta_b) meson are constructed to satisfy the spin symmetry...

Source: http://arxiv.org/abs/hep-ph/0212067v1

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Sep 20, 2013
09/13

by
T. Shigetani; K. Suzuki; H. Toki

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The pion structure function is studied in the Nambu and Jona-Lasinio (NJL) model. We calculate the forward scattering amplitude of a virtual photon from a pion target in the Bjorken limit, and obtain valence quark distributions of the pion at the low energy hadronic scale, where the NJL model is supposed to work. The calculated distribution functions are evolved to the experimental momentum scale using the Altarelli-Parisi equation. The resulting distributions are in a reasonable agreement with...

Source: http://arxiv.org/abs/hep-ph/9402286v1

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Sep 18, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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A method is formulated for the description of lambda hypernuclei in the framework of the unitary-model-operator approach (UMOA). The method is applied to $_{\Lambda}^{17}$O. A lambda-nucleon effective interaction is derived, taking the coupling of the sigma-nucleon channel into account. The lambda single-particle energies are calculated for the 0s_{1/2}, 0p_{3/2} and 0p_{1/2} states employing the Nijmegen soft-core (NSC), J\"ulich model-\~A (J\~A) and model-\~B (J\~B) hyperon-nucleon...

Source: http://arxiv.org/abs/nucl-th/9901055v2

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Sep 18, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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Microscopic nuclear structure calculations have been performed within the framework of the unitary-model-operator approach. Ground-state and single-particle energies are calculated for nuclei around ^{14}C, ^{16}O and ^{40}Ca with modern nucleon-nucleon interactions.

Source: http://arxiv.org/abs/nucl-th/0505076v1

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Sep 23, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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Shell structures in the N\simeq Z nucleus ^{17}O and the neutron-rich oxygen isotopes ^{23}O and ^{25}O are microscopically described by calculating single-particle energies with modern nucleon-nucleon interactions within the framework of the unitary-model-operator approach. It is found that the effect of three-body cluster terms on the single-particle energy is more important in ^{23}O and ^{25}O than ^{17}O.

Source: http://arxiv.org/abs/nucl-th/0312107v1

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Sep 22, 2013
09/13

by
S. Fujii; R. Okamoto; K. Suzuki

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We perform ab initio calculations for nuclei around ^{16}O, ^{40}Ca, and ^{56}Ni using realistic nucleon-nucleon forces. In particular, ^{56}Ni is computed as the heaviest nucleus in this kind of ab initio calculation. Ground-state and single-particle energies including three-body-cluster effects are obtained within the framework of the unitary-model-operator approach. It is shown that the CD-Bonn nucleon-nucleon potential gives quite good results close to the experimental values for all nuclei...

Source: http://arxiv.org/abs/0908.3376v2

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Jun 30, 2018
06/18

by
Satoko Sorahana; Takeru K. Suzuki; Issei Yamamura

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We propose that the 2.7 micron H_2O, 3.3 micron CH_4 and 4.6 micron CO absorption bands can be good tracers of chromospheric activity in brown dwarfs. In our previous study, we found that there are difficulties in explaining entire spectra between 1.0 and 5.0 microns with the Unified Cloudy Model (UCM), a brown dwarf atmosphere model. Based on simple radiative equilibrium, temperature in a model atmosphere usually decreases monotonically with height. However, if a brown dwarf has a...

Topics: Earth and Planetary Astrophysics, Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1401.5801

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Sep 20, 2013
09/13

by
T. K. Suzuki; A. Lazarian; A. Beresnyak

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We study the cascading of fast MHD modes in magnetically dominated plasma by performing one-dimensional (1D) dynamical simulations. We find that the cascading becomes more efficient as an angle between wave vector and underlying magnetic field increases and fast mode becomes more compressive. We also study imbalanced turbulence, in which wave packets propagating in one-direction have more power than those in the opposite direction. Unlike imbalanced \Alfvenic turbulence, the imbalanced fast...

Source: http://arxiv.org/abs/astro-ph/0608307v2

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Sep 18, 2013
09/13

by
T. K. Suzuki; K. Sumiyoshi; S. Yamada

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We investigate the role of Alfven waves in the core-collapse supernova (SN) explosion. We assume that Alfven waves are generated by convections inside a proto-neutron star (PNS) and emitted from its surface. Then these waves propagate outwards, dissipate via nonlinear processes, and heat up matter around a stalled prompt shock. To quantitatively assess the importance of this process for the revival of the stalled shock, we perform 1D time-dependent hydrodynamical simulations, taking into...

Source: http://arxiv.org/abs/0707.4345v2

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Sep 18, 2013
09/13

by
K. Suzuki; E. Hiyama; H. Toki; M. Kamimura

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Roles of quark-pair correlations in the baryon structure and the hyperon non-leptonic weak decay are studied within the non-relativistic constituent quark model. We construct the SU(3) ground state baryons by solving the three body problem rigorously with the confinement force and the short range spin-dependent attraction. We emphasize the importance of the $s=0$ quark-quark correlation to reproduce the $\Delta I=1/2$ enhancement of the hyperon decay, and demonstrate that resulting static...

Source: http://arxiv.org/abs/nucl-th/0002047v1

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Jul 20, 2013
07/13

by
S. Fujii; H. Kamada; R. Okamoto; K. Suzuki

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Binding energies of ^{3}H, ^{4}He, and ^{16}O are calculated, using low-momentum nucleon-nucleon interactions (V_{low-k}) for a wide range of the cutoff momentum \Lambda. In addition, single-particle energies in nuclei around ^{16}O are computed. The dependence of the binding energies and the single-particle energies in these nuclei on the cutoff momentum \Lambda of the V_{low-k} is examined. Furthermore, the availability of the V_{low-k} in nuclear structure calculations is discussed.

Source: http://arxiv.org/abs/nucl-th/0406082v1

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Jun 27, 2018
06/18

by
Tomoya Miyake; Takeru K. Suzuki; Shu-ichiro Inutsuka

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We investigate the dynamics of dust grains with various sizes in protoplanetary disk winds driven by magnetorotational turbulence, by simulating the time evolution of the dust grain distribution in the vertical direction. Small dust grains, which are well coupled to the gas, are dragged upward with the upflowing gas, while large grains remain near the midplane of a disk. Intermediate--size grains float at several scale heights from the midplane in time-averated force balance between the...

Topics: Earth and Planetary Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1505.03704

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Sep 19, 2013
09/13

by
Takayuki Muto; Takeru K. Suzuki; Shu-ichiro Inutsuka

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We analyze the physical processes of gap formation in an inviscid protoplanetary disk with an embedded protoplanet using two-dimensional local shearing-sheet model. Spiral density wave launched by the planet shocks and the angular momentum carried by the wave is transferred to the background flow. The exchange of the angular momentum can affect the mass flux in the vicinity of the planet to form an underdense region, or gap, around the planetary orbit. We first perform weakly non-linear...

Source: http://arxiv.org/abs/1009.4963v1

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27

Sep 18, 2013
09/13

by
J. Alam; A. Hayashigaki; K. Suzuki; T. Hatsuda

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The elastic leptoproduction of $\phi$ measured by the H1 collaboration at HERA is described by a perturbative QCD model, based on open $s\bar{s}$ production and parton hadron duality, proposed by Martin et al. We observe that both the total cross section and the ratio of the longitudinal and transverse cross sections are well reproduced with an effective strange-quark mass $m_s \sim 320- 380 $ MeV for various gluon distribution functions. Possible connection of the effective mass and the...

Source: http://arxiv.org/abs/hep-ph/0006284v2

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31

Sep 21, 2013
09/13

by
R. Okamoto; K. Suzuki; H. Kumagai; S. Fujii

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A new method is given for the model-space effective interaction. Introducing a new operator in place of the Q-box in the Krenciglowa-Kuo (KK) method, we derive a new equation for the effective interaction. This equation can be viewed as an extension of the KK method. We show that this equation can be solved both in iterative and non-iterative ways. We observe that the iteration procedure brings about fast acceleration of convergence compared to the KK approach. We also find that the...

Source: http://arxiv.org/abs/1011.1994v2

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22

Sep 21, 2013
09/13

by
K. Suzuki; E. Hiyama; H. Toki; M. Kamimura

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We study the roles of quark-pair correlations for baryon properties, in particular on non-leptonic weak decay of hyperons. We construct the quark wave function of baryons by solving the three body problem explicitly with confinement force and the short range attraction for a pair of quarks with their total spin being 0. We show that the existence of the strong quark-quark correlations enhances the non-leptonic transition amplitudes which is consistent with the data, while the baryon masses and...

Source: http://arxiv.org/abs/nucl-th/9905064v1

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28

Sep 21, 2013
09/13

by
E. Hiyama; K. Suzuki; H. Toki; M. Kamimura

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We study the role of quark-quark correlation in the baryon structure and, in particular, the hyperon non-leptonic weak decay, which is sensitive to the correlation between quarks in the spin-0 channel. We rigorously solve non-relativistic three-body problem for SU(3) ground state baryons to take into account the quark-pair correlation explicitly. With the suitable attraction in the spin-0 channel, resulting static baryon properties as well as the parity conserving weak decay amplitudes agree...

Source: http://arxiv.org/abs/nucl-th/0402007v1

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Sep 21, 2013
09/13

by
K. Suzuki; R. Okamoto; M. Kohno; S. Nagata

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Exact expressions of the Pauli exclusion operator Q in the nuclear matter calculation are presented in detail. Exact formulae are also given for the calculations of the single-particle-potential energy and the binding energy per nucleon with the exact Q operator. Numerical calculations of the G matrix in the lowest-order Brueckner theory are carried out to check the reliability of the standard angle-average approximation for the Q operator by employing the Bonn B and C NN potentials. It is...

Source: http://arxiv.org/abs/nucl-th/9907050v1