22,152 research outputs found
Open charm meson spectroscopy: Where to place the latest piece of the puzzle
We discuss how to classify the meson recently
discovered by the BaBar Collaboration. We consider four possible assignments,
together with signatures useful to distinguish among them.Comment: RevTeX, 5 pages, 1 eps figur
Nuclear Parton Distributions at the future Electron-Ion Collider
The 2015 nuclear physics long-range plan endorsed the realization of an
Electron-Ion Collider (EIC) as the next large construction project after the
completion of FRIB. With its high luminosity ( ), wide
kinematic reach in center-of-mass-energy (45GeV to 145GeV) and high lepton and
proton beam polarization, an EIC provides an unprecedented opportunity to reach
new frontiers in our understanding of the spin and dynamic structure of nuclei.
Despite of the success of the HERA collider in investigating the structure of a
single nucleon, the partonic structure of nuclei at moderate-to-small Bjorken's
still remains elusive. We present the evaluated impact of an EIC in
extracting the nuclear structure-functions from measurements of the reduced
cross section in deep inelastic scattering, including also the case of
measuring heavy quark production events. The potential constraints offered by
the EIC data in extracting the nuclear parton distribution functions is also
discussed.Comment: 5 pages, 4 figures, DIS 2017 Conference proceeding
GPDs at an EIC
The feasibility for a measurement of the exclusive production of a real
photon, a process although known as Deeply Virtual Compton Scattering (DVCS) at
an Electron Ion Collider (EIC) has been explored. DVCS is universally believed
to be a golden measurement toward the determination of the Generalized Parton
Distribution (GPDs) functions. The high luminosity of the machine, expected in
the order of 10^34 cm^-2 s^-1 at the highest center-of-mass energy, together
with the large resolution and rapidity acceptance of a newly designed dedicated
detector, will open a opportunity for very high precision measurements of DVCS,
and thus for the determination of GPDs, providing an important tool toward a
2+1 dimensional picture of the internal structure of the proton and nuclei.Comment: 4 pages, 3 figures, Prepared for the XX Int. Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS 2011) - 26-30 March 2012,
University of Bon
Free Boundary Formulation for BVPs on a Semi-Infinite Interval and Non-Iterative Transformation Methods
This paper is concerned with two examples on the application of the free
boundary formulation to BVPs on a semi-infinite interval. In both cases we are
able to provide the exact solution of both the BVP and its free boundary
formulation. Therefore, these problems can be used as benchmarks for the
numerical methods applied to BVPs on a semi-infinite interval and to free BVPs.
Moreover, we emphasize how for two classes of free BVPs, we can define
non-iterative initial value methods, whereas BVPs are usually solved
iteratively. These non-iterative methods can be deduced within Lie's group
invariance theory. Then, we show how to apply the non-iterative methods to the
two introduced free boundary formulations in order to obtain meaningful
numerical results. Finally, we indicate several problems from the literature
where our non-iterative transformation methods can be applied.Comment: 30 pages, 7 figures, 4 table
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