When using this data, please cite the original publication:

Additionally, you should cite the record:

@misc{hepdata.66539, author = "{ATLAS Collaboration}", title = "{Search for resonant diboson production in the $\ell\ell q\bar{q}$ final state in pp collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector}", howpublished = "{HEPData (collection)}", year = 2015, note = "\url{https://doi.org/10.17182/hepdata.66539}" }

or, if you prefer, a specific version of the record:

@misc{hepdata.66539.v1, author = "{ATLAS Collaboration}", title = "{Search for resonant diboson production in the $\ell\ell q\bar{q}$ final state in pp collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector (Version 1)}", howpublished = "{HEPData (collection)}", year = 2015, note = "\url{https://doi.org/10.17182/hepdata.66539.v1}" }

You can also cite this table directly.

@misc{hepdata.66539.v1/t2, author = "{ATLAS Collaboration}", title = "{``Table 2'' of ``Search for resonant diboson production in the $\ell\ell q\bar{q}$ final state in pp collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector'' (Version 1)}", howpublished = "{HEPData (dataset)}", year = 2015, note = "\url{https://doi.org/10.17182/hepdata.66539.v1/t2}" }