1,067 research outputs found
Search for the eta-mesic helium at COSY
We review status and perspectives of the search of the eta-mesic helium at
the cooler synchrotron COSY.Comment: Invited talk at the Excited QCD 09 Workshop, 8-14 February 2009,
Zakopane, Poland, 6 page
Combined analysis of the interaction using near threshold data
The final state interaction was investigated based on both the
invariant mass distributions measured at excess energies of Q = 10
and 28 MeV and the near threshold excitation function for the reaction. The final state enhancement factor was
parametrized using the effective range expansion. The effective range of the
interaction was estimated to be: and , and the
determined real and imaginary parts of the scattering length amount
to: and .Comment: 5 pages, 3 figures, article accepted for publication in Phys. Rev.
Search for the eta-mesic nuclei by means of COSY-11, WASA-at-COSY and COSY-TOF detector systems
We review status and perspectives of the search for the light eta-mesic
nuclei using COSY-11, WASA-at-COSY and COSY-TOF detector systems.Comment: Invited talk at the International Symposium on Mesic Nuclei, Krakow,
16 June 201
Test of charge conjugation invariance in the decay of the eta meson into pi(+)pi(-)pi(0)
In this work we present the preliminary results of the analysis of the pp->pp
eta(->pp pi(+)pi(-)pi(0) reaction aiming to test the charge conjugation
symmetry C in strong interactions. Based on approximately identified
eta->pi(+)pi(-)pi(0) decay events we have extracted asymmetry parameters
sensitive to C symmetry violation for different isospin values of the final
state and we have established that all are consistent with zero within the
obtained accuracy.Comment: MESON2012 - 12th International Workshop on Meson Production,
Properties and Interactio
Experimental proton-proton correlation function derived for the pp -> ppeta reaction
Based on the high statistics data from the pp -> ppX reaction measured by the
COSY-11 collaboration [1] we have derived a two-proton correlation function for
the production of the ppeta and pp+pions systems. The measured correlation
function normalized to the value simulated for a point-like source was compared
with a theoretical prediction in order to estimate the size of the reaction
volume.Comment: Talk given at the Symposium on Meson Physics at COSY-11 and
WASA-at-COSY Krakow, Poland, 17-22 June 200
Luminosity determination for the quasi-free nuclear reactions
A method for the calculation of the luminosity for the proton-nucleus
collisions based on the quasi-free proton-proton scattering is presented. As an
example of application the integrated luminosity for the scattering of protons
off the deuteron target is determined for the experiment of the quasi-free pn
--> pneta reaction performed by means of the COSY-11 facility.Comment: 7 pages, 5 figures, Presented at Symposium on Meson Physics at
COSY-11 and WASA-at-COSY, Cracow, Poland, 17-22 Jun 200
Genuine Multipartite Entanglement in the -Photon Decay of Positronium
The electron-positron annihilation into two photons is a standard technology
in medicine to observe e.g. metabolic processes in human bodies. A new
tomograph will provide the possibility to observe not only direct
annihilations but also the photons from the decay of ortho-positronium
atoms formed in the body. We show in this contribution that the three-photon
state with respect to polarisation degrees of freedom depends on the angles
between the photons and exhibits various specific entanglement features. In
particular genuine multipartite entanglement, a type of entanglement involving
all degrees of freedoms, is subsistent if the positronium was in a definite
spin eigenstate. Remarkably, when all spin eigenstates are mixed equally,
entanglement --and even stronger genuine multipartite entanglement-- survives.
Due to a "\textit{symmetrization}" process, however, -type of
entanglement remains whereas -type of entanglement vanishes. The survival
of particular entanglement properties in the mixing scenario may make it
possible to extract quantum information in form of distinct entanglement
features, e.g., from metabolic processes in human bodies.Comment: 9 pages, 5 figure
Luminosity determination for the deutron-deutron reactions using free and quasi-free reactions with WASA-at-COSY detector
Two methods of the luminosity determination for the experiment performed by
WASA collaboration to search for - bound state are
presented. During the measurement the technique of continous change of the beam
momentum in one accelerator cycle (called ramped beam) was applied. This
imposes the requirement to determine not only the total integrated luminosity,
but also its variation as a function of the beam momentum.Comment: Symposium on Applied Nuclear Physics and Innovative Technologies,
Krakow (Poland), 24-27.09.201
Multimeson production in pp interactions as a background for eta and eta' decays
Multimeson production in pp interactions comprises important background for
eta, omega and eta' mesons production experiments and for the studies of their
decays planned with WASA detector at COSY. The available information about the
reactions is summarized and the need for efforts to describe the processes is
stressed.Comment: Proceedings of MENU07 Conference Julich, Germany 200
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