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Bayesian model selection for electromagnetic kaon production on the nucleon | | L. De Cruz
; D.G. Ireland
; P. Vancraeyveld
; J. Ryckebusch
; | | Date: |
2 Apr 2010 | | Abstract: | We present the results of a Bayesian analysis of a Regge model to describe
the background contribution for K+ Lambda and K+ Sigma0 photoproduction. The
model is based on the exchange of K+(494) and K*+(892) trajectories in the
t-channel. We utilise the Bayesian evidence Z to determine the best model
variant for each channel. The Bayesian evidence integrals were calculated using
the Nested Sampling algorithm. For different prior widths, we find decisive
Bayesian evidence (Delta ln Z ~ 24) for a K+ Lambda photoproduction Regge
model with a positive vector coupling and a negative tensor coupling constant
for the K*+(892) trajectory, and a rotating phase factor for both trajectories.
Using the chi^2 minimisation method, one could not draw this conclusion from
the same dataset. For the K+ Sigma0 photoproduction Regge model, on the other
hand, the difference between the evidence integrals is insufficient to pinpoint
one model variant. | | Source: | arXiv, 1004.0353 | | Other source: | [GID 1353630] 1103.2048 | | Services: | Forum | Review | PDF | Favorites | |
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