TY - JOUR
T1 - Improved Gamma-Hadron Separation for PeV Photon Searches with IceCube
AU - Icecube Collaboration
AU - Schroeder, Frank G.
AU - Bontempo, Federico
AU - Abbasi, R.
AU - Ackermann, M.
AU - Adams, J.
AU - Agarwalla, S. K.
AU - Aguilar, J. A.
AU - Ahlers, M.
AU - Alameddine, J. M.
AU - Ali, S.
AU - Amin, N. M.
AU - Andeen, K.
AU - Argüelles, C.
AU - Ashida, Y.
AU - Athanasiadou, S.
AU - Axani, S. N.
AU - Babu, R.
AU - Bai, X.
AU - Baines-Holmes, J.
AU - Balagopal, A.
AU - Barwick, S. W.
AU - Bash, S.
AU - Basu, V.
AU - Bay, R.
AU - Beatty, J. J.
AU - Tjus, J. Becker
AU - Behrens, P.
AU - Beise, J.
AU - Bellenghi, C.
AU - Benkel, B.
AU - BenZvi, S.
AU - Berley, D.
AU - Bernardini, E.
AU - Besson, D. Z.
AU - Blaufuss, E.
AU - Bloom, L.
AU - Blot, S.
AU - Bodo, I.
AU - Bontempo, F.
AU - Motzkin, J. Y.Book
AU - Meneguolo, C. Boscolo
AU - Böser, S.
AU - Botner, O.
AU - Böttcher, J.
AU - Braun, J.
AU - Brinson, B.
AU - Brisson-Tsavoussis, Z.
AU - Burley, R. T.
AU - Butterfield, D.
AU - Kiryluk, J.
N1 - Publisher Copyright:
© Copyright owned by the author(s)
PY - 2025/12/30
Y1 - 2025/12/30
N2 - IceTop, the km2 surface array of the IceCube Neutrino Observatory at the South Pole, is sensitive to air showers of all primary particles, including gamma rays. In particular, in the PeV energy range, the combination of IceTop and IceCube’s deep optical detector provides excellent gamma-hadron separation. Almost all air showers induced by cosmic-ray protons and heavier nuclei in this energy range contain high-energy muons detectable by the deep detector, while most photon-induced air showers do not. Therefore, IceCube’s deep detector can be used to strongly suppress hadronic background in photon searches. Furthermore, the lateral distribution of the air-shower signal in IceTop provides additional gamma-hadron separation. In the PeV energy range, the gamma-hadron separation achieved is better than 10−3: air-shower events measured with IceCube are suppressed more than 1000 times stronger than photon-induced showers of the same energy simulated with Sibyll 2.3d. This improved gamma-hadron separation in combination with an extension of the energy range to lower energies provides discovery potential for future searches for PeV photon sources in IceCube’s field of view.
AB - IceTop, the km2 surface array of the IceCube Neutrino Observatory at the South Pole, is sensitive to air showers of all primary particles, including gamma rays. In particular, in the PeV energy range, the combination of IceTop and IceCube’s deep optical detector provides excellent gamma-hadron separation. Almost all air showers induced by cosmic-ray protons and heavier nuclei in this energy range contain high-energy muons detectable by the deep detector, while most photon-induced air showers do not. Therefore, IceCube’s deep detector can be used to strongly suppress hadronic background in photon searches. Furthermore, the lateral distribution of the air-shower signal in IceTop provides additional gamma-hadron separation. In the PeV energy range, the gamma-hadron separation achieved is better than 10−3: air-shower events measured with IceCube are suppressed more than 1000 times stronger than photon-induced showers of the same energy simulated with Sibyll 2.3d. This improved gamma-hadron separation in combination with an extension of the energy range to lower energies provides discovery potential for future searches for PeV photon sources in IceCube’s field of view.
UR - https://www.scopus.com/pages/publications/105029043085
U2 - 10.22323/1.501.0837
DO - 10.22323/1.501.0837
M3 - Conference article
AN - SCOPUS:105029043085
SN - 1824-8039
VL - 501
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 837
T2 - 39th International Cosmic Ray Conference, ICRC 2025
Y2 - 15 July 2025 through 24 July 2025
ER -