1 ========== minutes of HERAFitter User's meeting 09.09.2013 ============= 2 Status: 3 -successful presentation of HERAFitter in QCD@LHC (talk) and ICNFP (poster, EPS prize) 4 conferences, upcoming posters in ISMD (Chicago), TOP2013 (Germany), 5 Atlas SM workshop, QCD tools for LHC Physics (Fermilab). 6 -preparation for stable release: many improvements since beta-3 version for data to 7 theory quantitative comparisons, treatment of experimental uncertainties, drawing tools 8 with additional possibility to draw pulls; 9 several developments to be implemented in the near future: improvements to uPDFs, 10 QED PDFs, fits of lead PDFs, global minima tool, several other code improvements. 11 -longer term plans include improvements in ACOT scheme, theory predictions for the 12 differential ttbar cross sections, intrinsic charm, etc. 13 -doodle for next User's meeting in October: http://doodle.com/fygtcqk6fydkz3zm 14 15 16 Renat presented the status of the LO QED +NLO QCD evolution implementation in QCDNUM: 17 -excellent agreement with partonevolution-1.1.3 using MSTW2004QED PDFs (FFNS and VFNS), 18 (remaining difference on photon PDF between programs (~1.5%) due to lepton PDF 19 contributions in PE program). 20 -official release of QCDNUM to be released by M.Botje in the near future, 21 the implementation into HERAFitter by Renat will be done in parallel. 22 23 Fred Olness (work with Alex Kusina) presented the possibilities of including nPDFs 24 in HERAFitter: 25 -two possible methods, one including nPDFs via LHAPDF interface as external grid, 26 another - fit proton PDF with QCDNUM and convert to nuclear case in HERAFitter 27 e.g. for lead: u_LEAD(x,Q)= 82 u_p(x,Q) +125 u_n(x,Q). Good agreement fond comparing 28 results obtained with those two methods. 29 -next step is fit lead PDFs in HERAFitter, requires limit parametrisation parameters. 30 31 HERAverager: there is an interest in the combination of measurements in different bins.
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