Hyperon Content: |

Chart Legend - available data

− less than 6 values

− less than 20 values

− at least 20 values

Data Table - Click on a nuclide |
---|

✕
**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 here.

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.

**Used Masses**

All values in MeV/*c*²:

**About this Site **

Contact and support:

Philipp Eckert

Sabrina Ries

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.

Click here to download the bibtex reference to cite any plots or computed values from the database.

The standard procedure used in this database is the variance weighted mean. Further information can be found here.

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.

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.

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

All values in MeV/

p | 938.272088 | π^{0} |
134.9766 | Λ | 1115.683 | ||

n | 939.565420 | π^{±} |
139.5702 | Σ^{-} |
1197.449 | ||

Ξ^{-} |
1321.71 |

Contact and support:

Philipp Eckert

Sabrina Ries

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.

✕

**40 keV Systematic Error**

As suggested by D.H. Davis [Nuclear Physics A547 (1992) 369c-378c], a systematic error of 40 keV should be assumed for any emulsion measurement done before 1990 if there was no unique error published. We recommend this practice to avoid an underestimation of errors within these data sets.

✕

Further Information

✕

References | |
---|---|

BibTeX | |

Reference | |

E-Print | |

DOI | |

INSPIRE | |

✕
**Export Text File**

✕
**People who contributed to the data base:**

Benjamin Dönigus | Goethe-Universität Frankfurt a. Main |

Christophe Rappold | GSI Helmholtz Center for Heavy Ion Research Darmstadt |

Sho Nagao | Tohoku University Sendai |

Tatsuhiro Ishige | |

Masahiro Yoshimoto | RIKEN |