122 research outputs found
Probing the existence of d and He with a few-body approach
We investigate the possible -deuteron and He bound states with
the and few body method. In order to solve the three body
and four body Schr\"odinger equations, we apply the Gaussian expansion method.
The realistic AV8' potential together with an extra 3N three body force
which reproduce the binding energies of deuteron, H and He, are used.
We construct the relations between the complex Gaussian-type energy-independent
interactions and the scattering lengths . The relations
between the binding energies in d and He, and the scattering
lengths are then obtained. We find that to have a bound d nucleus, the
real scattering length should exceed at least 1.35 fm. As for the
He system, the bound state exists when the real fm if
we neglect the imaginary part of the interaction. After solving the
full four body complex Schr\"odinger equation, we find the imaginary
potential causes the system more unbound. Thus, we give the relations between
the bound or unbound scenarios of the He system and the complex scattering lengths.Comment: 7 pages, 11 figure
Estimation of (1S) production in ep process near threshold
The near-threshold photo-productions of heavy quarkonia are important ways to
test the QCD-inspired models and to constrain the gluon distribution of nucleon
in the large x region. Investigating the various models, we choose a
photon-gluon fusion model and a pomeron exchange model for J/
photo-production near threshold, emphasising on the explanation of the recent
experimental measurement by GlueX at JLab. We find that these two models are
not only valid in a wide range of the center-of-mass energy of and
proton, but also can be generalized to describe the (1S)
photo-production. Using these two models, we predict the electro-production
cross-sections of (1S) at EicC to be 48 fb to 85 fb at the
center-of-mass energy of 16.75 GeV.Comment: 5 pages, 4 figure
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