1,727,111 research outputs found
Two-parton twist-3 factorization in perturbative QCD
We prove collinear factorization theorem for the process
at the twist-3 level in the covariant gauge by means of the Ward identity,
concentrating on the two-parton case. It is shown that soft divergences cancel
and collinear divergences are grouped into the pseudo-scalar and pseudo-tensor
two-parton twist-3 pion distribution amplitudes. The delicate summation of a
complete set of diagrams for achieving factorization in momentum, spin, and
color spaces is emphasized. The proof is then extended to the exclusive
semileptonic decay , assuming the hard scale to be of
, where is a hadronic scale and
the meson mass. We explain the distinction between the factorization of
collinear divergences for a pion distribution amplitude and of soft divergences
for a meson distribution amplitude. The gauge invariance and universality
of the two-parton twist-3 pion distribution amplitudes are confirmed. The proof
presented here can accommodate the leading twist-2 case. We then compare our
proof with that performed in the framework of soft-collinear effective theory.Comment: 43 pages, 7 figures, many parts rewritten and updated reference
Public Outreach Report: Templeton Planning and Design Studies Fall 2012
This Public Outreach Report provides a summary of community outreach efforts done as part of the process to develop a community shared vision for the future development of Templeton. This planning effort was conducted as a class project by fourth year students in the City and Regional Planning Department at California Polytechnic State University over a five months period during the academic year of 2012-2013
Shandon Plan, Fall 2003/ Winter 2004
Shandon is a small community located about twenty miles east of Paso Robles in northern San Luis Obispo County. The town is adjacent to state Highway 46, and its main street, Centre Street, is also a state route—Highway 41—which runs through the center of town. The town’s population is growing, and currently totals about one thousand residents. The town’s population comprises two main groups; there are roughly equal numbers of Latino and white residents living in Shandon.
Shandon has very few services to offer its residents. The population is currently too small to support many businesses such as shops, restaurants, and other commercial activities. There is also a shortage in medical services, with no local facilities. The only services located in Shandon now are a Post Office, a small market, and a supply store. Residents currently must travel to other cities to fulfill their everyday needs—or go without
Hubble Space Telescope Photometry of the Dwarf Spheroidal Galaxy ESO 410-G005
We present HST WFPC2 imaging of the nearby low-surface-brightness dwarf
spheroidal galaxy ESO 410-G005, which has been resolved into stars for the
first time. The resulting color-magnitude diagram for about 2500 stars shows a
red giant branch branch with a tip at I=(22.4+-0.15), which yields a distance
of D=(1.9+-0.2) Mpc. ESO 410-G005 is found to be metal-poor with a mean
metallicity of (-1.8+-0.4) dex estimated from its red giant branch. Upper
asymptotic giant branch stars appear to be present near the center of the
galaxy, indicative of a substantial, centrally concentrated intermediate-age
population, unless these objects are artifacts of crowding. Previous studies
did not detect ESO 410-G005 in H alpha or in HI. ESO 410-G005 is a probable
member of the Sculptor group. Its linear separation from the nearest spiral,
NGC 55, is 230 kpc on the sky. The deprojected separation ranges from 340 to
615 kpc depending on the assumed distance of NGC 55. ESO 410 G005 appears to be
a relatively isolated dSph within the Sculptor group. Its absolute magnitude,
Mv = (-12.1+-0.2) mag, its central surface brightness, mu_V = (22.7+-0.1)
mag/arcsec^2, and its mean metallicity, [Fe/H] = (-1.8+-0.4) dex, follow the
trend observed for dwarf galaxies in the Local Group. (abridged)Comment: Accepted for publication in the Astrophysical Journal, Vol. 542 (Oct
20). 23 pages in AASTEX style, 9 figures, partially in gif format to save
spac
Delano Strategic Plan, Fall 2008/ Winter 2009
From September 2008 through March 2009, the City and Regional Planning Department of California Polytechnic State University San Luis Obispo (Cal Poly) worked with the City of Delano and its residents to create a strategic plan for the City’s future. The Delano Strategic Plan (DSP) was developed to address the input received from the community during an extensive public outreach process. The chapters included in this strategic plan include Community Outreach, Fundamental Strategies, Land Use, Economic Development, Housing, Health and Safety, and Youth issues
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