Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-06-02
Nucl.Instrum.Meth.A624:184-191,2010
Physics
High Energy Physics
High Energy Physics - Experiment
14 pages, 4 figures
Scientific paper
10.1016/j.nima.2010.08.107
Kinematic fitting, where constraints such as energy and momentum conservation are imposed on measured four-vectors of jets and leptons, is an important tool to improve the resolution in high-energy physics experiments. At future e+ e- colliders, photon radiation parallel to the beam carrying away large amounts of energy and momentum will become a challenge for kinematic fitting. A photon with longitudinal momentum p_z^\gamma (\eta) is introduced, which is parametrized such that \eta ~follows a normal distribution. In the fit, \eta ~is treated as having a measured value of zero, which corresponds to p_z^\gamma (\eta)=0. As a result, fits with constraints on energy and momentum conservation converge well even in the presence of a highly energetic photon, while the resolution of fits without such a photon is retained. A fully simulated and reconstructed e+ e- -> qqqq event sample at \sqrt{s}=500 GeV is used to investigate the performance of this method under realistic conditions, as expected at the International Linear Collider.
Beckmann Moritz
List Benno
List Jenny
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