Simultaneous least squares fitter based on the Lagrange multiplier method

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GUAN Ying-Hui, ZHENG Yang-Heng, ZHU Yong-Sheng and Simultaneous least squares fitter based on the Lagrange multiplier method[J]. Chinese Physics C, 2013, 37(10): 106201. doi: 10.1088/1674-1137/37/10/106201
GUAN Ying-Hui, ZHENG Yang-Heng, ZHU Yong-Sheng and Simultaneous least squares fitter based on the Lagrange multiplier method[J]. Chinese Physics C, 2013, 37(10): 106201.  doi: 10.1088/1674-1137/37/10/106201 shu
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Received: 2013-04-17
Revised: 2013-05-30
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Simultaneous least squares fitter based on the Lagrange multiplier method

Abstract: We developed a least squares fitter used for extracting expected physics parameters from the correlated experimental data in high energy physics. This fitter considers the correlations among the observables and handles the nonlinearity using linearization during the χ2 minimization. This method can naturally be extended to the analysis with external inputs. By incorporating with Lagrange multipliers, the fitter includes constraints among the measured observables and the parameters of interest. We applied this fitter to the study of the m D0-D0 mixing parameters as the test-bed based on MC simulation. The test results show that the fitter gives unbiased estimators with correct uncertainties and the approach is credible.

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