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Calibration and Background Evaluation for Dalitz Plot Analysis in Particle Physics

This document details the calibration of the calorimeter using Monte Carlo data (MC.rad04) and evaluations of background in the process of analyzing the decay channel η → π+π-π0. The focus is on the selection procedure for optimizing the Dalitz plot analysis, emphasizing the association of tracks to clusters and methods to filter background noise effectively. It highlights the miscalibration issues faced at different energy levels, with potential suggestions for resolution improvement and discussions on reconstruction discrepancies related to energy distribution and cluster multiplicity.

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Calibration and Background Evaluation for Dalitz Plot Analysis in Particle Physics

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  1. Test on MC rad04 • “Calorimeter” calibration. • (II) Evaluation of background.

  2.  with final state +-. I

  3. NRUN [26707 – 26813] (2002) • We require: • The cuts used for Dalitz plot +-0 analysis. • Track to cluster association • … and we look the cluster of bkg: • No associated to + track && no associated to - track && no radiative photon && no photons from 0 decay. • The minimum distance between the cluster and cluster (bkg) > 50 cm. (II) Selection procedure

  4. NCLU_BKG

  5. Tcl_bkg && Ecl_bkg

  6. θcl_bkg

  7. Conclusions • EMC miscalibration of 1% for E > 50 MeV • and up to 3 – 4 % for lower energy. • Resolution  OK. • RMS of time and position along the fiber can be improved. • (II) MC_rad04 reproduces correctly the distribution of T and E but there is a problem with cluster multiplicity and θ distribution.

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