Speaker
Hayk Pirumov
(PI Heidelberg)
Description
The proton parton distribution functions (PDFs)
are essential for precision physics at the LHC
and other hadron colliders. Their current level
of accuracy dominates the theory uncertainties
in Higgs production and it affects substantially
theory predictions for Beyond Standard Model
high mass production.
The determination of the PDFs is a complex
endeavor involving several physics process.
The main process is the lepton proton deep-
inelastic scattering (DIS), with data collected by
the HERA ep collider covering a large kinematic
phase space needed to extract PDFs.
Further processes (fixed target DIS, ppbar
collisions etc.) provide additional constraining
powers for flavour separation. In particular, the
precise measurements obtained or to come
from LHC will continue to improve the knowledge
of the PDF.
HERAFitter project is an open source QCD fit
framework ready to extract PDFs and assess the
impact of new data which we would like to present
here. The framework includes modules allowing for
a various theoretical and methodological options,
capable to fit a large number of relevant data sets
from HERA, Tevatron and LHC. This framework is
already used in many analyses at the LHC.
A new release is available publicly with added
features for different parametrisation methods,
alternative options to assess the impact of new
data based on bayesian reweighting techinque,
different representation of the chisquare, as well as
the option to accomodate for asymmetric systematic uncertainties.
Authors
Hayk Pirumov
(PI Heidelberg)
Ringaile Placakyte
(Hamburg University)
Voica Ana Maria Radescu
(Deutsches Elektronen-Synchrotron (DE))
