This meeting of the PDF4LHC is a working meeting towards a new PDF4LHC combination. A meeting of the LHCHWG1 Higgs WG on aN3LO will also be held in the afternoon. The agenda for both parts of the meeting is provisional, all timings could alter dynamically according to the wished of the participants!
Before we can compare aN3LO PDFs we need to do some benchmarking of codes. The PDF4LHC meeting will be focussed on that.
Road map for PDF4LHC aN3Lo combination:
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Compare aN3LO PDFs, PDF luminosities among CT25, MSHT (new aN3LO PDF coming with updated input), NNPDF
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Compare NNLO->aN3LO ratios. Ratio of ratio plot which indicates how much of the difference between PDFs is due to the different data sets/treatments in each PDF set, and howmuch is due to the transition to aN3LO
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If differences still exist above the level we are comfortable with, come up with a framework to understand the origin of those differences, for example starting with a simpler data set
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Impact of QED corrections; is there a way of further reducing the spread
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Combination of the 3 PDFs for LHC phenomenology