A Bayesian Analysis of QCD Sum Rules by Philipp Gubler

Author:Philipp Gubler
Language: eng
Format: epub, pdf
Publisher: Springer Japan, Tokyo

5.2.3 Investigation of the Stability of the Obtained Spectral Function

Next, we will briefly discuss the dependence of our results on the upper boundary of the employed Borel mass region . In Fig. 5.4, we show the results for the values , 2.0 and 2.5 GeV. Here, the default model with parameters and GeV was used. The spectral functions of these three cases almost coincide and have the same qualitative features. Quantitatively, the peak position of the -meson is shifted only 20 MeV when is raised from 1.5 to 2.5 GeV.

Fig. 5.4MEM results for three different values of the upper boundary of the Borel mass . For the default model, the same version as in Fig. 5.3, c was used. Thus, the red line of this figure is the same as the one of Fig. 5.3, c

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