We discuss c\bar{c} and b\bar{b} pair productions at ep collider for studying extremely small x(g) region. It has been shown that Large Hadron electron Collider (LHeC) has a reach of about x(g)>10^{-6}. The aim of this work is to show that the PDF uncertainties in the heavy flavour production. Maximum difference of cross section between PDFs 60% has been found in the process of ep\rightarrow eq\bar{q}X.
@article{arxiv.1306.4764,
title = {A search for b(c) quark pdf uncertainties at TeV scale ep collider},
author = {Husnu Aksakal and S. Okan Kara},
journal= {arXiv preprint arXiv:1306.4764},
year = {2013}
}