Tunneling Characteristics of La2-xSrxCuO4-y/Metal Contacts

Aoki, Ryôzô; Murakami, Hironaru; Sakai, Kazuo; Yamada, Kotaro

doi:10.1007/978-3-642-77154-5_32

Cited by 4 publications

(9 citation statements)

References 4 publications

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“…where the explicit forms of the operators are found in Ref. [7,9], and we obtain am res = 9.72 × 10 −5 , which roughly corresponds to m res ∼ 0.3 MeV.…”

Section: Simulation Parameterssupporting

confidence: 67%

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Application of DWF to heavy-light mesons

Yamada¹

2004

Nuclear Physics B - Proceedings Supplements

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“…where the explicit forms of the operators are found in Ref. [7,9], and we obtain am res = 9.72 × 10 −5 , which roughly corresponds to m res ∼ 0.3 MeV.…”

Section: Simulation Parameterssupporting

confidence: 67%

“…Nonperturbative renormalization, which is essential to high precision calculations, also seems to work remarkably well [6]. Simulating light quarks using DWF benefits from these advantages and has been successfully used in the light hadron system [7,8,9]. It is, then, natural to consider its application to the massive quarks.…”

Section: Introductionmentioning

confidence: 99%

Application of DWF to heavy-light mesons

Yamada¹

2004

Nuclear Physics B - Proceedings Supplements

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“…In [37] a result for the SU(3) breaking ratio ξ at a single lattice spacing a ∼ 0.11 fm and with a minimum pion mass of 430 MeV is presented. This result has been recently updated in [38] with two lattice spacings a ∼ 0.086, 0.11 fm and smaller pion masses ranging from 290 to 420 MeV. The authors of [38] also calculate B Bs(d) , f Bs(d) B Bs(d) and B Bs /B Bd .…”

Section: Neutral B (S) Mixing In the Standard Modelmentioning

confidence: 87%

“…This result has been recently updated in [38] with two lattice spacings a ∼ 0.086, 0.11 fm and smaller pion masses ranging from 290 to 420 MeV. The authors of [38] also calculate B Bs(d) , f Bs(d) B Bs(d) and B Bs /B Bd . For the matching between the HQET operators onto the QCD ones, one loop perturbative matching is implemented.…”

Section: Neutral B (S) Mixing In the Standard Modelmentioning

confidence: 87%

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Neutral meson oscillations on the lattice

Carrasco

2016

Nuclear and Particle Physics Proceedings

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Accurate measurements of K, D and B meson mixing amplitudes provide stringent constraints in the Unitary Triangle analysis, as well as useful bounds on New Physics scales. Lattice QCD provides a non perturbative tool to compute the hadronic matrix elements entering in the effective weak Hamiltonian, with errors at a few percent level and systematic uncertainties under control. I review recent lattice results for these hadronic matrix element performed with N f = 2, N f = 2 + 1 and N f = 2 + 1 + 1 dynamical sea quarks.

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Nucleon axial charge from quenched lattice QCD with domain wall fermions and improved gauge action

Sasaki

Blum

Ohta

et al. 2002

Nuclear Physics B - Proceedings Supplements

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In our previous DWF calculation with the Wilson gauge action at β = 6.0 (a −1 ≃ 1.9 GeV) on a 16 3 × 32 × 16 lattice, we found that g A had a fairly strong dependence on the quark mass. A simple linear extrapolation of g A to the chiral limit yielded a value that was almost a factor of two smaller than the experimental one. Here we report our recent study of this issue. In particular, we investigate possible errors arising from finite lattice volume, especially in the lighter quark mass region. We employ a RG-improved gauge action (DBW2), which maintains very good chiral behavior even on a coarse lattice (a −1 ≃ 1.3 GeV), in order to perform simulations at large physical volume (> (2fm) 3 ). Our preliminary results suggest that the finite volume effect is significant.The nucleon (iso-vector) axial charge g A is a particularly interesting quantity. We know precisely the experimental value g A = 1.2670(35) from neutron beta decay. Deviation of this quantity from unity, in contrast to the vector charge, g V = 1, reflects the fact that the axial current is only partially conserved in the strong interaction while the vector current is exactly conserved. However neither lattice-QCD nor any model calculation have successfully reproduced this value. Thus, the calculation of g A is an especially relevant test of the chiral properties of DWF in the baryon sector. In addition, calculation of g A is an important first step in studying polarized nucleon structure functions since g A = ∆u − ∆d where p, s|q f γ 5 γ µ q f |p, s = 2s µ ∆q f with s 2 = −1 and s · p = 0.We follow the standard practice [1] for the calculation of g V and g A . We define the three-point functions for the relevant components of the local vector current Jwhere Γ = V (vector) or A (axial) with P V = (1 + γ 4 )/2 and P A = P V γ i γ 5 . We use the nucleon interpolating operator N = ε abc (u T a Cγ 5 d b )u c . For the axial current, the three-point function is averaged over i = 1, 2, 3. The lattice estimates of vector and axial charges can be derived from the ratio between two-and three-point functionswhereRecall that in general lattice operators O lat and continuum operator O con are regularized in different schemes. The operators are related by a renormalization factorThis implies that the continuum value of vector and axial charges are given byIn the case of conventional Wilson fermions, the renormalization factor Z A is usually estimated in perturbation theory (Z A differs from unity because of explicit symmetry breaking). For DWF, the conserved axial current receives no renormalization. This is not true for the lattice local current. An important advantage with DWF, however, is that the lattice renormalizations, Z V and Z A , of the local currents are the same [2] so that

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Tunneling Characteristics of La2-xSrxCuO4-y/Metal Contacts

Cited by 4 publications

References 4 publications

Application of DWF to heavy-light mesons

Application of DWF to heavy-light mesons

Neutral meson oscillations on the lattice

Nucleon axial charge from quenched lattice QCD with domain wall fermions and improved gauge action

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