The Hypernuclear Database ‒ General Information
Cite the Database
Click here to download the bibtex reference
to cite any plots or computed values from the database.
Procedures of Averaging
The standard procedure used in this database is the variance weighted mean. Further information can be found
The more advanced method which is robust to asymmetric statistical errors is the maximum likelihood method described by R. Barlow
and established by C. Rappold
Exclusion of Measurements
Measurements which contribute to an average with a weight of less than 2% are considered as obsolete and therefore excluded. The same holds for ones with up to 5% if they have an extreme χ² value. Excluded measurements will appear gray in the data table. However, one can still select them manually.
Scaling of Errors
Following the PDG procedure, the overall error of a mean value will get scaled if the χ² sum is larger than the number of degrees of freedom (ndf = number of contributing measurements – 1). Then a scaling factor is computed S
= ( χ² / ndf )¹/₂
and applied to the error.
All values in MeV/c
About this Site
Contact and support:
Prof. Dr. Patrick Achenbach
Don't hesitate to contact us via e-mail
This project is supported by the European Union's Horizon 2020 research and innovation programme under grant agreement No. 824093.