Status of Average-x from Lattice QCD

Details Status of Average-x from Lattice QCD Status of Average-x from Lattice QCD

2011-03-18

arxiv.org/abs/1103.3655v1

Physics

High Energy Physics

High Energy Physics - Lattice

proceedings for 3rd International Workshop on Nucleon Structure at Large Bjorken x

Scientific paper

As algorithms and computing power have advanced, lattice QCD has become a precision technique for many QCD observables. However, the calculation of nucleon matrix elements remains an open challenge. I summarize the status of the lattice effort by examining one observable that has come to represent this challenge, average-x: the fraction of the nucleon's momentum carried by its quark constituents. Recent results confirm a long standing tendency to overshoot the experimentally measured value. Understanding this puzzle is essential to not only the lattice calculation of nucleon properties but also the broader effort to determine hadron structure from QCD.

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