3,984 research outputs found
transition in lattice QCD
We study the electromagnetic
transition in 2+1 flavor lattice QCD, which gives access to the dominant decay
mode of baryon. The magnetic dipole and the electric quadrupole
transition form factors are computed. The magnetic dipole form factor is found
to be mainly determined by the strange quark and the electric quadrupole form
factor to be negligibly small, in consistency with the quark model. We also
evaluate the helicity amplitudes and the decay rate.Comment: 8 pages, 1 figure. Added references and discussio
A look inside charmed-strange baryons from lattice QCD
The electromagnetic form factors of the spin-3/2 baryons, namely
, , and , are
calculated in full QCD on PACS-CS lattices with a pion mass of
156(9) MeV. The electric charge radii and magnetic moments from the and
multipole form factors are extracted. Results for the electric quadrupole
form factors, , are also given. Quark sector contributions are computed
individually for each observable and then combined to obtain the baryon
properties. We find that the charm quark contributions are systematically
smaller than the strange-quark contributions in the case of the charge radii
and magnetic moments. moments of the and
provide a statistically significant data to conclude that their electric charge
distributions are deformed to an oblate shape. Properties of the spin-1/2
and baryons are also computed and a thorough
comparison is given. This complete study gives valuable hints about the
heavy-quark dynamics in charmed hadrons.Comment: 14 pages, 14 figures. Includes a subsection on the systematic effect
Risky neighborhoods? House appreciation in underserved areas
This research project will investigate house price appreciation trends in traditionally underserved areas. The primary goal is to develop and test a methodology to determine what part of a home (appreciation)is due to structural and neighborhood effects, and what part may be attributable to other factors such as homeowners actions (including repair, maintenance, and upgrades). We will employ a space-time modeling framework to measure appreciation varying influences of structural and neighborhood, and other factors on appreciation overtime. We will compare appreciation trends across different submarkets (underserved and conventional) and for both high risk and low risk borrowers. The empirical analysis will employ thr TRW-REDI housing transaction data set for Miami MSA (USA) for the 1985-1993 period in conjunction with Census and American Housing Survey (AHS) data.
Electromagnetic structure of charmed baryons in Lattice QCD
As a continuation of our recent work on the electromagnetic properties of the
doubly charmed baryon, we compute the charge radii and the magnetic
moments of the singly charmed , and the doubly charmed
baryons in 2+1 flavor Lattice QCD. In general, the charmed
baryons are found to be compact as compared to the proton. The charm quark acts
to decrease the size of the baryons to smaller values. We discuss the mechanism
behind the dependence of the charge radii on the light valence- and sea-quark
masses. The magnetic moments are found to be almost stable with respect to
changing quark mass. We investigate the individual quark sector contributions
to the charge radii and the magnetic moments. The magnetic moments of the
singly charmed baryons are found to be dominantly determined by the light quark
and the role of the charm quark is significantly enhanced for the doubly
charmed baryons.Comment: Updated results, improved analysis. Version to appear in JHE
Electromagnetic properties of doubly charmed baryons in Lattice QCD
We compute the electromagnetic properties of \Xi_cc baryons in 2+1 flavor
Lattice QCD. By measuring the electric charge and magnetic form factors of
\Xi_cc baryons, we extract the magnetic moments, charge and magnetic radii as
well as the \Xi_cc \Xi_cc \rho coupling constant, which provide important
information to understand the size, shape and couplings of the doubly charmed
baryons. We find that the two heavy charm quarks drive the charge radii and the
magnetic moment of \Xi_cc to smaller values as compared to those of, e.g., the
proton.Comment: 15 pages, 5 figures; added discussions and references, version
accepted by PL
LHC Charge Asymmetry as Constraint on Models for the Tevatron Top Anomaly
The forward-backward asymmetry in top quark production at
the Tevatron has been observed to be anomalously large by both CDF and D0. It
has been suggested that a model with a coupling to and might
explain this anomaly, and other anomalies in mesons. Single-top-quark
production in this model is large, and arguably in conflict with Tevatron
measurements. However the model might still be viable if is
somewhat smaller than its current measured central value. We show that even
with smaller couplings, the model can be discovered (or strongly excluded) at
the LHC using the 2010 data sets. We find that a suitable charge-asymmetry
measurement is a powerful tool that can be used to constrain this and other
sources of anomalous single-top production, and perhaps other new high-energy
charge-asymmetric processes.Comment: 25 pages, 4 figures, note adde
Vector and axial-vector couplings of D and D* mesons in 2+1 flavor Lattice QCD
Using the axial-vector coupling and the electromagnetic form factors of the D
and D* mesons in 2+1 flavor Lattice QCD, we compute the D*D\pi, DD\rho and
D*D*\rho coupling constants, which play an important role in describing the
charm hadron interactions in terms of meson-exchange models. We also extract
the charge radii of D and D* mesons and determine the contributions of the
light and charm quarks separately.Comment: 19 pages, 3 figures; added references and comments, published versio
Robust Entanglement in Atomic Systems via Lambda-Type Processes
It is shown that the system of two three-level atoms in
configuration in a cavity can evolve to a long-lived maximum entangled state if
the Stokes photons vanish from the cavity by means of either leakage or
damping. The difference in evolution picture corresponding to the general model
and effective model with two-photon process in two-level system is discussed.Comment: 10 pages, 3 figure
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