Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-08-16
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, Contribution to the Conference on Advanced Statistical Techniques in Particle Physics, Durham, 18-22 March 2002
Scientific paper
Finite detector resolution and limited acceptance require to apply unfolding methods in high energy physics experiments. Information on the detector resolution is usually given by a set of Monte Carlo events. Based on the experience with a widely used unfolding program (RUN) a modified method has been developed. The first step of the method is a maximum likelihood fit of the Monte Carlo distributions to the measured distribution in one, two or three dimensions; the finite statistic of the Monte Carlo events is taken into account by the use of Barlows method with a new method of solution. A clustering method is used before to combine bins in sparsely populated areas. In the second step a regularization is applied to the solution, which introduces only a small bias. The regularization parameter is determined from the data after a diagonalization and rotation procedure.
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