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Detection of vertical muons with the HAWC water Cherenkov detectors and its application to gamma/hadron discrimination

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Title: Detection of vertical muons with the HAWC water Cherenkov detectors and its application to gamma/hadron discrimination
Authors: Zuñiga-Reyes, Ariel, Hernández, Alberto, Miranda-Aguilar, Aldo, Sandoval, Andrés, Martínez-Castro, J., Alfaro, Rubén, Belmont, Ernesto, León, Hermes, Vizcaya, Ana P.
Publication Year: 2017
Collection: Astrophysics
Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
More Details: The HAWC observatory reconstructs atmospheric showers induced by very high-energy primary cosmic- or gamma-rays. Cosmic-rays with hadronic nature are several orders of magnitude more frequent than primary gammas and therefore it is necessary to perform the best gamma-hadron discrimination for each event to be able to survey the gamma-ray sky. Single vertical muons cause very characteristic signals in the 300 HAWC detectors. Particularly, those events that produce signals in the four PMTs of a tank corresponding to muons traversing the tank in the central region. In such cases exist the correlation that the largest signal is also the earliest to arrive, this due to the geometry of the Cherenkov light emission and the fact that relativistic muons travel faster than the light in the medium. This pattern is different from that of electrons, positrons and low energy gammas showering in the first meter of the tank water, which is typical of electromagnetic showers. In this work, we explored whether in air-showers it is possible to identify muon signals and whether this can help in the gamma/hadron discrimination of the recorded events.
Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contributions
Document Type: Working Paper
Access URL: http://arxiv.org/abs/1708.09500
Accession Number: edsarx.1708.09500
Database: arXiv
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  Data: Detection of vertical muons with the HAWC water Cherenkov detectors and its application to gamma/hadron discrimination
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  Data: <searchLink fieldCode="AR" term="%22Zuñiga-Reyes%2C+Ariel%22">Zuñiga-Reyes, Ariel</searchLink><br /><searchLink fieldCode="AR" term="%22Hernández%2C+Alberto%22">Hernández, Alberto</searchLink><br /><searchLink fieldCode="AR" term="%22Miranda-Aguilar%2C+Aldo%22">Miranda-Aguilar, Aldo</searchLink><br /><searchLink fieldCode="AR" term="%22Sandoval%2C+Andrés%22">Sandoval, Andrés</searchLink><br /><searchLink fieldCode="AR" term="%22Martínez-Castro%2C+J%2E%22">Martínez-Castro, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Alfaro%2C+Rubén%22">Alfaro, Rubén</searchLink><br /><searchLink fieldCode="AR" term="%22Belmont%2C+Ernesto%22">Belmont, Ernesto</searchLink><br /><searchLink fieldCode="AR" term="%22León%2C+Hermes%22">León, Hermes</searchLink><br /><searchLink fieldCode="AR" term="%22Vizcaya%2C+Ana+P%2E%22">Vizcaya, Ana P.</searchLink>
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  Data: The HAWC observatory reconstructs atmospheric showers induced by very high-energy primary cosmic- or gamma-rays. Cosmic-rays with hadronic nature are several orders of magnitude more frequent than primary gammas and therefore it is necessary to perform the best gamma-hadron discrimination for each event to be able to survey the gamma-ray sky. Single vertical muons cause very characteristic signals in the 300 HAWC detectors. Particularly, those events that produce signals in the four PMTs of a tank corresponding to muons traversing the tank in the central region. In such cases exist the correlation that the largest signal is also the earliest to arrive, this due to the geometry of the Cherenkov light emission and the fact that relativistic muons travel faster than the light in the medium. This pattern is different from that of electrons, positrons and low energy gammas showering in the first meter of the tank water, which is typical of electromagnetic showers. In this work, we explored whether in air-showers it is possible to identify muon signals and whether this can help in the gamma/hadron discrimination of the recorded events.<br />Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contributions
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      – SubjectFull: Astrophysics - High Energy Astrophysical Phenomena
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