Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 7: Eingeladene Vorträge II
T 7.2: Eingeladener Vortrag
Dienstag, 29. März 2011, 14:30–15:00, 30.22: 130
Parton Distribution Functions, Uncertainties and Constraints — Burkard Reisert1 and •Ringaile Placakyte2 — 1Max-Planck-Institut für Physik, München — 2Universität Hamburg
The understanding of the structure of the proton is of fundamental interest. The precise knowledge of the proton parton distribution functions, PDFs, and their uncertainties is of importance when calculating predictions for the measurements at the LHC.
Traditionally global QCD fits like those of the CTEQ, MRST, GRV and ABKM groups combine results from many different experiments. The proper treatment of statistical and systematic uncertainties of those many experiments which may or may not be consistent with each other poses a problem not easy to be solved.
When the measurements of neutral current, NC, and charged current, CC, electron- and positron-proton cross sections became available first attempts to extract sets of PDFs from HERA data alone started. After the completion of the HERA program at DESY the final measurements of the NC and CC cross sections by the H1 and ZEUS collaborations are now being published, the results of both experiments are being combined and some new ideas, like NNPDF, are on the market. The combined QCD fit activities of the H1 and ZEUS collaborations, result in a series of PDF sets, known as HERAPDFs.
Apparently now is the right time to review - from an experimentalists point of view - the various approaches to extract the PDFs, their uncertainties and how those are influenced by the constraints, which are built into the fits.