The matrix element method utilizes ab initio calculations of probability
densities as powerful discriminants for processes of interest in experimental
particle physics. The method has already been used successfully at previous and
current collider experiments...
However, the computational complexity of this
method for final states with many particles and degrees of freedom sets it at a
disadvantage compared to supervised classification methods such as decision
trees, k nearest-neighbour, or neural networks. This note presents a concrete
implementation of the matrix element technique using graphics processing units. Due to the intrinsic parallelizability of multidimensional integration,
dramatic speedups can be readily achieved, which makes the matrix element
technique viable for general usage at collider experiments.