Gamma/Hadron Separation with the HAWC Observatory

Alfaro, R.; Alvarez, C.; Álvarez, J. D.; Angeles Camacho, J. R.; Arteaga-Velázquez, J. C.; Avila Rojas, D.; Ayala Solares, H. A.; Babu, R.; Belmont-Moreno, E.; Brisbois, C.; Caballero-Mora, K. S.; Capistrán, T.; Carramiñana, A.; Casanova, S.; Chaparro-Amaro, O.; Cotti, U.; Cotzomi, J.; de León, S. Coutiño; De la Fuente, E.; de León, C.; Hernandez, R. Diaz; Dingus, B. L.; DuVernois, M. A.; Durocher, M.; Díaz-Vélez, J. C.; Ellsworth, R. W.; Engel, K.; Espinoza, C.; Fan, K. L.; Alonso, M. Fernández; Fraija, N.; Garcia, D.; García-González, J. A.; Garfias, F.; González, M. M.; Goodman, J. A.; Harding, J. P.; Hernandez, S.; Hona, B.; Huang, D.; Hueyotl-Zahuantitla, F.; Hüntemeyer, P.; Iriarte, A.; Jardin-Blicq, A.; Joshi, V.; Kaufmann, S.; Lara, G. J. Kundem A.; Lee, W. H.; Lee, J.; Vargas, H. León; Linnemann, J. T.; Luis-Raya, G.; Lundeen, J.; Malone, K.; Marandon, V.; Martinez, O.; Martínez-Castro, J.; Matthews, J. A.; Miranda-Romagnoli, P.; Morales-Soto, J. A.; Nayerhoda, A.; Nellen, L.; Nisa, M. U.; Noriega-Papaqui, R.; Olivera Nieto, L.; Omodei, N.; Peisker, A.; Araujo, Y. Pérez; Pérez-Pérez, E. G.; Rho, C. D.; Rosa-González, D.; Ruiz-Velasco, E.; Salazar, H.; Greus, F. Salesa; Sandoval, A.; Parkinson, P. M. Saz; Serna-Franco, J.; Smith, A. J.; Springer, R. W.; Tibolla, O.; Tollefson, K.; Torres, I.; Torres-Escobedo, R.; Turner, R.; Ureña-Mena, F.; Villaseñor, L.; Wang, X.; Watson, I. J.; Werner, F.; Willox, E.; Wood, J.; Zepeda, A.; Zhou, H.

doi:10.1016/j.nima.2022.166984

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Gamma/Hadron Separation with the HAWC Observatory

MPS-Authors

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Jardin-Blicq, A.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Marandon, V.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Olivera Nieto, L.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Tibolla, O.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Alfaro, R., Alvarez, C., Álvarez, J. D., Angeles Camacho, J. R., Arteaga-Velázquez, J. C., Avila Rojas, D., et al. (2022). Gamma/Hadron Separation with the HAWC Observatory. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1039: 166984. doi:10.1016/j.nima.2022.166984.

Cite as: https://hdl.handle.net/21.11116/0000-000C-0091-F

Abstract

The High Altitude Water Cherenkov (HAWC) gamma-ray observatory observes
atmospheric showers produced by incident gamma rays and cosmic rays with energy
from 300 GeV to more than 100 TeV. A crucial phase in analyzing gamma-ray
sources using ground-based gamma-ray detectors like HAWC is to identify the
showers produced by gamma rays or hadrons. The HAWC observatory records roughly
25,000 events per second, with hadrons representing the vast majority
($>99.9\%$) of these events. The standard gamma/hadron separation technique in
HAWC uses a simple rectangular cut involving only two parameters. This work
describes the implementation of more sophisticated gamma/hadron separation
techniques, via machine learning methods (boosted decision trees and neural
networks), and summarizes the resulting improvements in gamma/hadron separation
obtained in HAWC.