Consideration of Photon Radiation in Kinematic Fits for Future e+ e- Colliders

Details Consideration of Photon Radiation in Kinematic Fits for Future e+ e- Colliders Consideration of Photon Radiation in Kinematic Fits for Future e+ e- Colliders

2010-06-30

arxiv.org/abs/1007.0020v1

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 figures, conference proceeding of International Linear Collider Workshop 2010, Beijing

Scientific paper

Kinematic fitting 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 pz({\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 pz = 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.

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