1,709 research outputs found
Associated strangeness production in the pp to pK^+K^-p and pp to pK^+ pi^0 Sigma^0 reactions
The total and differential cross sections for associated strangeness
production in the and reactions
have been studied in a unified approach using an effective Lagrangian model. It
is assumed that both the and final states originate from
the decay of the resonance which was formed in the production
chain . The available experimental data
are well reproduced, especially the ratio of the two total cross sections,
which is much less sensitive to the particular model of the entrance channel.
The significant coupling of the resonance to is
further evidence for large components in the quark wave function of
the resonance.Comment: Published in Phys. Rev.
Study of the K+K- Interaction at COSY-11
In this article we present studies of the near threshold pp-->ppK+K- reaction
in view of the K+K- final state interaction. The investigations include
analysis of both the low-energy K+K- invariant mass distributions measured by
COSY-11 collaboration at excess energies of Q = 10 MeV and Q = 28 MeV and the
near threshold excitation function for the pp-->ppK+K- reaction. As a result of
these studies we have estimated the K+K- scattering length more precise
compared to the previous analysis based only on the analysis of the
differential cross sections.Comment: Proceedings from the MESON2010 conference ,3 pages, 3 figure
An explanation of the ABC enhancement in the dd -> alpha X reaction at intermediate energies
The dd -> alpha X reaction is studied in a model where each pair of nucleons
in the projectile and target deuterons undergoes pion production through the NN
-> d pi reaction. The condition that the two deuterons fuse to form an
alpha-particle then leads to peaks at small missing masses, the well-known ABC
enhancement, but also a broad structure around the maximum missing mass. With a
simplified input amplitude the model gives a quantitative description of both
the alpha-particle momentum and angular distributions for a deuteron beam
energy of 1250 MeV.Comment: 10 pages, Latex2e, 1 eps figure, submitted to Phys. Lett.
Small scale noise and wind tunnel tests of upper surface blowing nozzle flap concepts. Volume 1. Aerodynamic test results
The results and analyses of aerodynamic and acoustic studies conducted on the small scale noise and wind tunnel tests of upper surface blowing nozzle flap concepts are presented. Various types of nozzle flap concepts were tested. These are an upper surface blowing concept with a multiple slot arrangement with seven slots (seven slotted nozzle), an upper surface blowing type with a large nozzle exit at approximately mid-chord location in conjunction with a powered trailing edge flap with multiple slots (split flow or partially slotted nozzle). In addition, aerodynamic tests were continued on a similar multi-slotted nozzle flap, but with 14 slots. All three types of nozzle flap concepts tested appear to be about equal in overall aerodynamic performance but with the split flow nozzle somewhat better than the other two nozzle flaps in the landing approach mode. All nozzle flaps can be deflected to a large angle to increase drag without significant loss in lift. The nozzle flap concepts appear to be viable aerodynamic drag modulation devices for landing
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