scholarly journals Thermal modification of bottomonium spectra from QCD sum rules with the maximum entropy method

2013 ◽  
Vol 897 ◽  
pp. 28-41 ◽  
Author(s):  
Kei Suzuki ◽  
Philipp Gubler ◽  
Kenji Morita ◽  
Makoto Oka
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Sum Rules ◽  
Entropy Method ◽  
Thermal Modification ◽  
Qcd Sum Rules

Quarkonia at Finite T: An Approach Based On QCD Sum Rules and the Maximum Entropy Method

2013 ◽  
Vol 54 (7-10) ◽  
pp. 1059-1062
Author(s):  
Philipp Gubler ◽  
Kei Suzuki ◽  
Kenji Morita ◽  
Makoto Oka
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Sum Rules ◽  
Entropy Method ◽  
Qcd Sum Rules

Enhanced Information Recovery in 2D On-and Off-Resonance Nutation NQR using the Maximum Entropy Method

1996 ◽  
Vol 51 (5-6) ◽  
pp. 337-347 ◽  
Author(s):  
Mariusz Maćkowiak ◽  
Piotr Kątowski
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Theoretical Description ◽  
Entropy Method ◽  
Zero Field ◽  
Resonance Effects ◽  
Information Recovery ◽  
Truncation Errors ◽  
Enhanced Resolution ◽  
2D Data

Abstract Two-dimensional zero-field nutation NQR spectroscopy has been used to determine the full quadrupolar tensor of spin - 3/2 nuclei in serveral molecular crystals containing the 3 5 Cl and 7 5 As nuclei. The problems of reconstructing 2D-nutation NQR spectra using conventional methods and the advantages of using implementation of the maximum entropy method (MEM) are analyzed. It is shown that the replacement of conventional Fourier transform by an alternative data processing by MEM in 2D NQR spectroscopy leads to sensitivity improvement, reduction of instrumental artefacts and truncation errors, shortened data acquisition times and suppression of noise, while at the same time increasing the resolution. The effects of off-resonance irradiation in nutation experiments are demonstrated both experimentally and theoretically. It is shown that off-resonance nutation spectroscopy is a useful extension of the conventional on-resonance experiments, thus facilitating the determination of asymmetry parameters in multiple spectrum. The theoretical description of the off-resonance effects in 2D nutation NQR spectroscopy is given, and general exact formulas for the asymmetry parameter are obtained. In off-resonance conditions, the resolution of the nutation NQR spectrum decreases with the spectrometer offset. However, an enhanced resolution can be achieved by using the maximum entropy method in 2D-data reconstruction.

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