Kalman filter track fits and track breakpoint analysis

被引：7

作者：

Astier, P

Cardini, A

Cousins, RD

Letessier-Selvon, A

Popov, BA

Vinogradova, T

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Univ Paris 06, LPNHE, F-75252 Paris 05, France

[3] Univ Paris 07, LPNHE, F-75252 Paris 05, France

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2000年 / 450卷 / 01期

关键词：

breakpoints; Kalman filter; track fitting;

D O I：

10.1016/S0168-9002(00)00154-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We give an overview of track fitting using the Kalman filter method in the NOMAD detector at CERN, and emphasize how the wealth of by-product information can be used to analyze track breakpoints (discontinuities in track parameters caused by scattering, decay, etc.). After reviewing how this information has been previously exploited by others, we describe extensions which add power to breakpoint detection and characterization. We show how complete fits to the entire track, with breakpoint parameters added, can be easily obtained from the information from unbroken fits. Tests inspired by the Fisher F-test can then be used to judge breakpoints. Signed quantities (such as change in momentum at the breakpoint) can supplement unsigned quantities such as the various chisquares. We illustrate the method with electrons from real data, and with Monte Carlo simulations of pion decays. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：138 / 154

页数：17

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