8 research outputs found
Analysis of the differential cross sections for the reaction pp --> ppK+K- in view of the K+K- interaction
Measurements of the pp-->ppK+K- reaction, performed with the experiment
COSY-11 at the Cooler Synchrotron COSY, show a significant difference between
the obtained excitation function and theoretical expectations including pp-FSI
>. The discrepancy may be assigned to the influence of K+K- or K-p interaction.
This interaction should manifest itself in the distributions of the
differential cross section. This thesis presents an analysis of event
distributions as a function of the invariant masses of two particle subsystems.
In particular in the analysis two generalizations of the Dalitz plot proposed
by Goldhaber and Nyborg are used. The present Investigations are based on the
experimental data determined by the COSY-11 collaboration from two measurements
at excess energies of Q = 10 MeV and 28 MeV. The experimental distributions are
compared to results of Monte Carlo simulations generated with various
parameters of the K+K- and K-p interaction. The values of the K+K- scattering
length, extracted from two data sets for Q = 10 MeV and 28 MeV amount to:
a_K+K- = (11 +- 8) + i(0 +- 6) fm for Q = 10 MeV, and a_K+K- = (0.2 +-0.2) +
i(0.0 +- 0.5) fm for Q = 28 MeV, Due to the low statistics, the extracted
values have large uncertainties and are consistent with very low values of the
real and imaginary part of the scattering length.Comment: Master Thesis prepared in the Nuclear Physics Division of the
Jagiellonian University; 37 pages, 19 figure
kaonic atoms experiment at the daφne collider by siddharta siddharta 2
The excellent quality kaon beam provided by the
DA\PhiΦNE
collider of LNF-INFN (Italy) together with SIDDHARTA/SIDDHARTA-2 new
experimental techniques, as very precise and fast-response X-ray
detectors, allow to perform unprecedented measurements on light kaonic
atoms crucial for a deeper understanding of the low-energy quantum
chromodynamics (QCD) in the strangeness sector. In this paper an
overview of the main results obtained by the SIDDHARTA collaboration, as
well as the future plans related to the SIDDHARTA-2 experiment, are
discussed
A novel approach to the measurement of the hyperon nucleon/s interaction by AMADEUS
The AMADEUS collaboration is investigating the low-energy antikaon interactions with nucleons and nuclei, taking advantage of the lowmomentum antikaons beam provided by the DAΦNE collider at LNF-INFN.
In this work a novel technique is outlined for the measurement of the hyperonnucleon two and three body scattering cross sections. The method consists in producing hyperons by antikaons atomic captures in light nuclear targets, and extrapolating the cross sections from the measurement of the yields of the corresponding elastic final state interactions of the hyperons.
The feasibility of this kind of analyses is shown by comparison of calculated Σ0 production in 4He by K− absorption on three nucleons, with a sample of K−12C absorption measured by AMADEUS in collaboration with KLOE. The feasibility of a dedicated high statistics measurement is discussed
Studies of kaonic atoms at the DAΦNE collider: from SIDDHARTA to SIDDHARTA-2
The DAΦNE electron-positron collider of the Laboratori Nazionali di Frascati of
INFN is a worldwide unique low-energy kaon source and for this reason is suitable for low-energy
kaon physics like kaonic atoms and kaon-nucleons/nuclei interaction studies. Kaonic atoms
are atomic systems where an electron is replaced by a negatively charged kaon, containing
the strange quark, which interacts in the lowest orbits with the nucleus also by the strong
interaction. As a result, their study offers the unique opportunity to perform experiments
equivalent to scattering at vanishing relative energy. This allows to study the strong interaction
between the antikaon and the nucleon or the nucleus “at threshold”, without the need of ad hoc
extrapolation to zero energy, as in scattering experiments. The most precise kaonic hydrogen
measurement to date, together with an exploratory measurement of kaonic deuterium, were
carried out by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of
LNF-INFN, by combining the excellent quality kaon beam delivered by the collider with new
experimental techniques, as fast and precise Silicon-Drift X-ray Detectors. The measurement
of kaonic deuterium will be realized in the near future by SIDDHARTA-2, a major upgrade of
SIDDHARTA
X-ray Detectors for Kaonic Atoms Research at DAΦNE
This article presents the kaonic atom studies performed at the INFN National Laboratory of Frascati (Laboratori Nazionali di Frascati dell’INFN, LNF-INFN) since the opening of this field of research at the DA Φ NE collider in early 2000. Significant achievements have been obtained by the DA Φ NE Exotic Atom Research (DEAR) and Silicon Drift Detector for Hadronic Atom Research by Timing Applications (SIDDHARTA) experiments on kaonic hydrogen, which have required the development of novel X-ray detectors. The 2019 installation of the new SIDDHARTA-2 experiment to measure kaonic deuterium for the first time has been made possible by further technological advances in X-ray detection