10 research outputs found
A critical view on the deeply bound K^- pp system
We briefly review the situation around the claimed deeply bound K^- states in
different recent experiments and concentrate particularly on the state K^- pp
advocated by the FINUDA collaboration in nuclear K^- absorption. We perform a
theoretical simulation of the process and show that the peak in the Lambda p
spectrum that was interpreted as a deep K^- pp bound state corresponds mostly
to the process K^- p p --> Lambda p followed by final state interactions of the
produced particles with the daughter nucleus.Comment: 11 pages, 14 figure
Strange meson-nucleon states in the quark potential model
The quark potential model and resonating group method are used to investigate
the bound states and/or resonances. The model potential consists of
the t-channel and s-channel one-gluon exchange potentials and the confining
potential with incorporating the QCD renormalization correction and the
spin-orbital suppression effect in it. It was shown in our previous work that
by considering the color octet contribution, use of this model to investigate
the low energy elastic scattering leads to the results which are in pretty
good agreement with the experimental data. In this paper, the same model and
method are employed to calculate the masses of the bound systems.
For this purpose, the resonating group equation is transformed into a standard
Schr\"odinger equation in which a nonlocal effective interaction
potential is included. Solving the Schr\"odinger equation by the variational
method, we are able to reproduce the masses of some currently concerned
states and get a view that these states possibly exist as
molecular states. For the system, the same calculation gives no support to
the existence of the resonance which was announced
recently.Comment: 15 pages, 4 figure
Conventional view versus FINUDA claims of a deeply bound K
We critically revise the recent claims of a deeply bound K-pp state associated to a peak seen in the Λp invariant-mass spectrum following nuclear K- absorption reactions measured by the FINUDA Collaboration. An explicit theoretical simulation shows that the peak is simply generated from a two-nucleon absorption process, like K
-
pp→Λp, followed by final-state interactions of the produced particles with the residual nucleus