Application and performance of an ML-EM algorithm in NEXT
Abstract
The goal of the NEXT experiment is the observation of neutrinoless double beta decay in Xe using a gaseous xenon TPC with electroluminescent amplification and specialized photodetector arrays for calorimetry and tracking. The NEXT Collaboration is exploring a number of reconstruction algorithms to exploit the full potential of the detector. This paper describes one of them: the Maximum Likelihood Expectation Maximization (ML-EM) method, a generic iterative algorithm to find maximum-likelihood estimates of parameters that has been applied to solve many different types of complex inverse problems. In particular, we discuss a bi-dimensional version of the method in which the photosensor signals integrated over time are used to reconstruct a transverse projection of the event. First results show that, when applied to detector simulation data, the algorithm achieves nearly optimal energy resolution (better than 0.5% FWHM at the Q value of Xe) for events distributed over the full active volume of the TPC.
Keywords
Cite
@article{arxiv.1705.10270,
title = {Application and performance of an ML-EM algorithm in NEXT},
author = {NEXT Collaboration and A. Simón and C. Lerche and F. Monrabal and J. J. Gómez-Cadenas and V. Álvarez and C. D. R. Azevedo and J. M. Benlloch-Rodríguez and F. I. G. M. Borges and A. Botas and S. Cárcel and J. V. Carrión and S. Cebrián and C. A. N. Conde and J. Díaz and M. Diesburg and J. Escada and R. Esteve and R. Felkai and L. M. P. Fernandes and P. Ferrario and A. L. Ferreira and E. D. C. Freitas and A. Goldschmidt and D. González-Díaz and R. M. Gutiérrez and J. Hauptman and C. A. O. Henriques and A. I. Hernandez and J. A. Hernando Morata and V. Herrero and B. J. P. Jones and L. Labarga and A. Laing and P. Lebrun and I. Liubarsky and N. López-March and M. Losada and J. Martín-Albo and G. Martínez-Lema and A. Martínez and A. D. McDonald and C. M. B. Monteiro and F. J. Mora and L. M. Moutinho and J. Muñoz Vidal and M. Musti and M. Nebot-Guinot and P. Novella and D. R. Nygren and B. Palmeiro and A. Para and J. Pérez and M. Querol and J. Renner and L. Ripoll and J. Rodríguez and L. Rogers and F. P. Santos and J. M. F. dos Santos and C. Sofka and M. Sorel and T. Stiegler and J. F. Toledo and J. Torrent and Z. Tsamalaidze and J. F. C. A. Veloso and R. Webb and J. T. White and N. Yahlali},
journal= {arXiv preprint arXiv:1705.10270},
year = {2017}
}
Comments
19 pages, 16 figures