4,265 research outputs found
Creating a Religious Properties Database for the City of New Bedford: an Analysis of Best Practices and Available Systems
This policy analysis was written to provide the city of New Bedford, the Waterfront Historic Area League, Inter-church Council of Greater New Bedford, and the congregations with possible database systems to consider in creating their historic religious properties database. It also provides the best methodology to use when choosing a database. Deciding on who will be involved in the choosing process, determining a budget, and listing the mandatory requirements the database should provide are all important to consider in the decision making process
Osteopathic Medicine and Primary Care completes first year of publication
Osteopathic Medicine and Primary Care affords authors the opportunity for rapid and universal dissemination of their work. We are keen to receive author manuscripts and reader comments on articles during 2008. A journal fund has been established to offset the cost of article processing charges for eligible authors who submit qualified manuscripts
Osteopathic Medicine and Primary Care: a new journal for changing times
Osteopathic Medicine and Primary Care is dedicated to the rapid and universal dissemination of peer-reviewed research and scholarly work within its scope. It aims to bridge diverse professional communities by providing a common forum for the publication of research relevant to the clinical practice of primary care
Space-like and time-like pion electromagnetic form factor and Fock state components within the Light-Front dynamics
The simultaneous investigation of the pion electromagnetic form factor in the
space- and time-like regions within a light-front model allows one to address
the issue of non-valence components of the pion and photon wave functions. Our
relativistic approach is based on a microscopic vector meson dominance (VMD)
model for the dressed vertex where a photon decays in a quark-antiquark pair,
and on a simple parametrization for the emission or absorption of a pion by a
quark. The results show an excellent agreement in the space like region up to
-10 , while in time-like region the model produces reasonable
results up to 10 .Comment: 74 pages, 11 figures, use revtex
Study of the semileptonic decay \Lambda_b^0 \to \Lambda_c^+ l^- \bar{\nu}_l
Within the framework of a nonrelativistic quark model we evaluate the six
form factors associated to the \Lambda_b^0 \to \Lambda_c^+ l^- \bar{\nu}_l
semileptonic decay. The baryon wave functions were evaluated using a
variational approach applied to a family of trial functions constrained by
Heavy Quark Symmetry (HQS). We use a spectator model with only one-body current
operators. For these operators we keep up to first order terms on the internal
(small) heavy quark momentum, but all orders on the transferred (large)
momentum. Our result for the partially integrated decay width is in good
agreement with lattice calculations. Comparison of our total decay width to
experiment allows us to extract the V_{cb} Cabbibo-Kobayashi-Maskawa matrix
element for which we obtain a value of |V_{cb}|=0.047\pm 0.005 in agreement
with a recent determination by the DELPHI Collaboration. Furthermore, we obtain
the universal Isgur-Wise function with a slope parameter \rho^2=0.98 in
agreement with lattice results.Comment: 4 pages, 3 figures. Presented at 6th International Conference on
Hyperons, Charm and Beauty Hadrons (BEACH 2004), Chicago, Illinois, 27 Jun -
3 Jul 200
Rare exclusive semileptonic b -> s transitions in the Standard Model
We study long-distance effects in rare exclusive semileptonic decays B -> (K,
K*) (l+ l-, nu bar{nu}) and analyze dilepton spectra and asymmetries within the
framework of the Standard Model. The form factors, describing the meson
transition amplitudes of the effective Hamiltonian are calculated within the
lattice-constrained dispersion quark model: the form factors are given by
dispersion representations through the wave functions of the initial and final
mesons, and these wave functions are chosen such that the B -> K* transition
form factors agree with the lattice results at large q**2. We calculate
branching ratios of semileptonic B -> K, K* transition modes and study the
sensitivity of observables to the long-distance contributions. The shape of the
forward-backward asymmetry and the longitudinal lepton polarization asymmetry
are found to be independent of the long-distance effects and mainly determined
by the values of the Wilson coefficients in the Standard Model.Comment: revtex, 17 pp., 5 figures with epsfig.st
A connection between inclusive semileptonic decays of bound and free heavy quarks
A relativistic constituent quark model, formulated on the light-front, is
used to derive a new parton approximation for the inclusive semileptonic decay
width of the B-meson. A simple connection between the decay rate of a free
heavy-quark and the one of a heavy-quark bound in a meson or in a baryon is
established. The main features of the new approach are the treatment of the
b-quark as an on-mass-shell particle and the inclusion of the effects arising
from the b-quark transverse motion in the B-meson. In a way conceptually
similar to the deep-inelastic scattering case, the B-meson inclusive width is
expressed as the integral of the free b-quark partial width multiplied by a
bound-state factor related to the b-quark distribution function in the B-meson.
The non-perturbative meson structure is described through various quark-model
wave functions, constructed via the Hamiltonian light-front formalism using as
input both relativized and non-relativistic potential models. A link between
spectroscopic quark models and the B-meson decay physics is obtained in this
way. Our predictions for the B -> X_c l nu_l and B -> X_u l nu_l decays are
used to extract the CKM parameters |V_cb| and |V_ub| from available inclusive
data. After averaging over the various quark models adopted and including
leading-order perturbative QCD corrections, we obtain |V_cb| = (43.0 +/-
0.7_exp +/- 1.8_th) 10^-3 and |V_ub| = (3.83 +/- 0.48_exp +/- 0.14_th) 10^-3,
implying |V_ub / V_cb| = 0.089 +/- 0.011_exp +/- 0.005_th, in nice agreement
with existing predictions.Comment: revised version with pQCD corrections included, to appear in Physical
Review
Scaling law for the electromagnetic form factors of the proton
The violation of the scaling law for the electric and magnetic form factors
of the proton are examined within the cloudy bag model. The suppression of the
ratio of the electric and magnetic form factors is natural in the bag model.
The pion cloud plays a moderate role in understanding the recent data from
TJNAF.Comment: 8 pages, REVTeX, 2 figures include
- …