Non-Perturbative Renormalization for Staggered Fermions (Self-energy Analysis)

We present preliminary results of data analysis for the non-perturbative renormalization (NPR) on the self-energy of the quark propagators calculated using HYP improved staggered fermions on the MILC asqtad lattices. We use the momentum source to generate the quark propagators. In principle, using the vector projection operator of $(\bar{\bar{\gamma_\mu \otimes 1}})$ and the scalar projection operator $(\bar{\bar{1 \otimes 1}})$, we should be able to obtain the wave function renormalization factor $Z_q'$ and the mass renormalization factor $Z_q \cdot Z_m$. Using the MILC coarse lattice, we obtain a preliminary but reasonable estimate of $Z_q'$ and $Z_q \cdot Z_m$ from the data analysis on the self-energy.Comment: 7 pages, 4 figures, Contribution to proceedings of 30th International Symposium on Lattice Field Theory (Lattice 2012), June 24-29, 2012; Cairns, Australi

Neutron Electric Dipole Moment on the Lattice

For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD $\Theta$-term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.Comment: Plenary talk presented at the 35th International Symposium on Lattice Field Theory (Lattice 2017), Granada, Spain, June 2017. 15 pages, 10 figure

Non-perturbative Renormalization of Bilinear Operators with Improved Staggered Quarks

We present renormalization factors for the bilinear operators obtained using the non-perturbative renormalization method (NPR) in the RI-MOM scheme with improved staggered fermions on the MILC asqtad lattices ($N_f = 2+1$). We use the MILC coarse ensembles with $20^3 \times 64$ geometry and $am_{\ell}/am_s = 0.01/0.05$. We obtain the wave function renormalization factor $Z_q$ from the conserved vector current and the mass renormalization factor $Z_m$ from the scalar bilinear operator. We also present preliminary results of renormalization factors for other bilinear operators.Comment: 7 pages, 4 figures, Lattice 2013 Proceedin

Introduction To A New Geo-Referenced Street Level Content: 3D GEOPANO

Geospatial mash-up is to produce a new worthy value by combining geo-referenced contents and different kinds of service. Despite of its high popularity in aerial view contents such as Google Earth, it is hardly achieved especially in street level due to the poor georeferencing quality of the underlining street level contents. In this study we propose a new street-level georeferenced panorama image content, ‘3D GeoPano’. While the most existing contents provide only the location and orientation for each entire image not for each pixel, this new content is accurately georeferenced pixel by pixel so that one can derive 3D absolute coordinates for every pixel. Based on the precisely determined 3D ground coordinates per every pixel, GIS database linkage can be more close, flexible and organic. This can improve the quality of geospatial mash-up service in street level. Such ‘3D GeoPano’ will be developed in open source community. By doing so, we expect to activate the geospatial mashup in street-level as well as to spread the geospatial technology