Acceleration of matrix element computations for precision measurements
arXiv:1410.6319 · doi:10.1016/j.nima.2014.11.063
Abstract
The matrix element technique provides a superior statistical sensitivity for precision measurements of important parameters at hadron colliders, such as the mass of the top quark or the cross section for the production of Higgs bosons. The main practical limitation of the technique is its high computational demand. Using the concrete example of the top quark mass, we present two approaches to reduce the computation time of the technique by a factor of 90. First, we utilize low-discrepancy sequences for numerical Monte Carlo integration in conjunction with a dedicated estimator of numerical uncertainty, a novelty in the context of the matrix element technique. Second, we utilize a new approach that factorizes the overall jet energy scale from the matrix element computation, a novelty in the context of top quark mass measurements. The utilization of low-discrepancy sequences is of particular general interest, as it is universally applicable to Monte Carlo integration, and independent of the computing environment.
submitted to Nuclear Instruments and Methods in Physics Research A
References in corpus (5)
- Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
- PYTHIA 6.4 Physics and Manual
- Automation of the matrix element reweighting method
- Precision measurement of the top-quark mass in lepton+jets final states
- Top Quark Mass Measurement in the Lepton + Jets Channel Using a Matrix Element Method and in situ Jet Energy Calibration