A dataset representing the space of parton distribution function fit, each point in the variables labelled X1-X56 indicate moving +- 1 standard devation from the 'best' (maximum likelihood estimate) fit of the function. Each observation has all predictions of the corresponding measurement from an experiment.
Details
(see table 3 in that paper for more explicit details).
The remaining columns are:
InFit: A flag indicating whether an observation entered the fit of CT14HERA2 parton distribution function
Type: First number of ID
ID: contains the identifier of experiment, 1XX/2XX/5XX correpsonds to Deep Inelastic Scattering (DIS) / Vector Boson Production (VBP) / Strong Interaction (JET). Every ID points to an experimental paper.
pt: the per experiment observational id
x,mu: the kinematics of a parton. x is the parton momentum fraction, and mu is the factorisation scale.
References
Wang, B.-T., Hobbs, T. J., Doyle, S., Gao, J., Hou, T.-J., Nadolsky, P. M., & Olness, F. I. (2018). PDFSense: Mapping the sensitivity of hadronic experiments to nucleon structure. Retrieved from https://arxiv.org/abs/1808.07470
Cook, D., Laa, U., & Valencia, G. (2018). Dynamical projections for the visualization of PDFSense data. The European Physical Journal C, 78(9), 742. doi:10.1140/epjc/s10052-018-6205-2