10 research outputs found
Generalization of the model-independent Laurent-Pietarinen single-channel pole-extraction formalism to multiple channels
A method to extract resonance pole information from single-channel
partial-wave amplitudes based on a Laurent (Mittag-Leffler) expansion and
conformal mapping techniques has recently been developed. This method has been
applied to a number of reactions and provides a model-independent extraction
procedure which is particularly useful in cases where a set of amplitudes is
available only at descrete energies. This method has been generalized and
applied to the case of a multi-channel fit, where several sets of amplitudes
are analysed simultaneously. The importance of unitarity constraints is
discussed. The final result provides a powerful, model-independent tool for
analyzing partial-wave amplitudes of coupled or connected channels based
entirely on the concepts of analyticity and unitarity
Multichannel Anomaly of the Resonance Pole Parameters Resolved
Inspired by anomalies which the standard scattering matrix pole-extraction
procedures have produced in a mathematically well defined coupled-channel
model, we have developed a new method based solely on the assumption of
partial-wave analyticity. The new method is simple and applicable not only to
theoretical predictions but to the empirical partial-wave data as well. Since
the standard pole-extraction procedures turn out to be the lowest-order term of
the proposed method the anomalies are understood and resolved.Comment: 5 page
Direct Immunofluorescence and Immunohistochemistry in Diagnostics of Glomerulonephritis
The needle biopsies from 60 transplanted and native kidneys have been processed and a prospective analysis of pattern, intensity and distribution of immunoglobulin deposits (IgA, IgG and IgM) and complement components (C3c and C1q) identified in these lesions has been carried out by immunohistochemistry with three step immunoperoxidase, in the period from 2000 to 2004. Those deposits were previously detected and analyzed by immunofluorescence. The samples consisted of 30 renal biopsies, previously diagnosed with glomerulonephritis and positive immunofluorescence and 30 renal biopsies without morphologic changes and deposits on immunofluorescence. 78,7% of the analyzed samples showed the identical results of the deposits of immunoglobulin and components of the complement with both, immunohistochemistry and immunofluorescence method. Sensitivity of the immunohistochemistry method with three step immunoperoxidase for all analyzed immunoglobulin and complement components is high (0,93), while specificity for the same method is 0,79. Standardized method of the three step immunoperoxidase on the paraffin embedded, formalin fixed needle renal biopsies could successfully replace the immunofluorescence method in diagnostic of GN, with the emphasis on a follow up and control of each single step in the procedure of the method
Pole positions and residues from pion photoproduction using the Laurent-Pietarinen expansion method
Generalization of the model-independent Laurent–Pietarinen single-channel pole-extraction formalism to multiple channels
Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
Final version of the KLF Proposal [C12-19-001] approved by JLab PAC48. The intermediate version of the proposal was posted in arXiv:1707.05284 [hep-ex]. 103 pages, 52 figures, 8 tables, 324 references. Several typos were fixedWe propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron beam will enable a flux on the order of , which exceeds the flux of that previously attained at SLAC by three orders of magnitude. The use of a deuteron target will provide first measurements ever with neutral kaons on neutrons. The experiment will measure both differential cross sections and self-analyzed polarizations of the produced , , , and hyperons using the GlueX detector at the Jefferson Lab Hall D. The measurements will span CM from to 0.95 in the range W = 1490 MeV to 2500 MeV. The new data will significantly constrain the partial wave analyses and reduce model-dependent uncertainties in the extraction of the properties and pole positions of the strange hyperon resonances, and establish the orbitally excited multiplets in the spectra of the and hyperons. Comparison with the corresponding multiplets in the spectra of the charm and bottom hyperons will provide insight into he accuracy of QCD-based calculations over a large range of masses. The proposed facility will have a defining impact in the strange meson sector through measurements of the final state system up to 2 GeV invariant mass. This will allow the determination of pole positions and widths of all relevant -,-,-,-, and -wave resonances, settle the question of the existence or nonexistence of scalar meson and improve the constrains on their pole parameters. Subsequently improving our knowledge of the low-lying scalar nonet in general