Wang, X.Thomas, A.Young, R.2016-07-082016-07-082016Physics Letters B, 2016; 753:595-5990370-26931873-2445http://hdl.handle.net/2440/100080We report a calculation of the combined effect of photon radiation and quark mass differences on charge symmetry violation (CSV) in the parton distribution functions of the nucleon. Following a recent suggestion of Martin and Ryskin, the initial photon distribution is calculated in terms of coherent radiation from the proton as a whole, while the effect of the quark mass difference is based on a recent lattice QCD simulation. The distributions are then evolved to a scale at which they can be compared with experiment by including both QCD and QED radiation. Overall, at a scale of 5 GeV², the total CSV effect on the phenomenologically important difference between the d and u-quark distributions is some 20% larger than the value based on quark mass differences alone. In total these sources of CSV account for approximately 40% of the NuTeV anomaly.en© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3Charge symmetry; parton distributions; electromagnetic correctionJournal article003004145910.1016/j.physletb.2015.12.0620003687836000822-s2.0-84952881388230969Wang, X. [0000-0001-9164-0027]Thomas, A. [0000-0003-0026-499X]Young, R. [0000-0002-4527-1811]