Abstract
HERA was the first and only ep collider. It was in operation from 1992 to 2007 and the two collaborations ZEUS and H1 collected about 0.5 fb −1 of integrated luminosity each. Inclusive data from both collaborations were combined and used to determine the set of parton distribution functions called HERAPDF2.0. The history of HERA is presented as well as the long path to the final data combination and HERAPDF2.0. The proton remains full of wonders and parton distribution functions might have nothing to do with them. The legacy of HERA are the precise ep data which can be plotted as legacy plots.
Highlights
Sometimes it makes no sense to rewrite what was previously written
HERA was the first and only ep collider. It was in operation from 1992 to 2007 and the two collaborations ZEUS and H1 collected about 0.5 fb−1 of integrated luminosity each
The proton remains full of wonders and parton distribution functions might have nothing to do with them
Summary
Sometimes it makes no sense to rewrite what was previously written. Please consult the original paper [1] from H1 and ZEUS for the full story of HERA data combination and HERAPDF2.0.For a discussion on whether parton distribution functions at low Bjorken x have anything to do with the proton, please see [2].As I have decided not to rewrite the data combination and HERAPDF2.0 paper, I just provide some HERA legacy plots. HERA was the first and only ep collider.
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