Speaker
Dr
Hannu Paukkunen
(University of Jyväskylä, Finland)
Description
In this talk, we discuss the compatibility of different deeply
inelastic neutrino-nucleus data sets and the universal nuclear
parton distribution functions (PDFs). This is an issue that has
lately been investigated by different groups but the conclusions
have been contradictory. While some studies have found a good overall
agreement between the nuclear PDFs and the neutrino data, others
have claimed for an incompatibility.
Here, we demonstrate that the independent neutrino data sets from
NuTeV, CHORUS and CDHSW collaborations differ in the absolute
overall normalization and that it is not possible to accurately
reproduce all the data simultaneously with a single set of PDFs.
Our strategy to overcome this difficulty and allow a consistent
use of all neutrino data in global PDF analyses is to normalize the
data by the integrated cross-sections thereby cancelling possible
inaccuracies in the absolute normalization. Indeed, this brings all
data to a surprisingly good mutual agreement underscoring the
x-dependence of the nuclear modifications in a model-independent
way. The consistency of these data with the present nuclear PDFs is
verified by introducing a method to test the effect of a new data
set in an existing global fit that performed a Hessian error analysis.
Author
Dr
Hannu Paukkunen
(University of Jyväskylä, Finland)
Co-author
Dr
Carlos Albert Salgado Lopez
(Universidade de Santiago de Compostela, Spain)
