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Title: First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector

Abstract

We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16 TeV remained after event selections in the diffuse analysis, with an expected total background contribution of 8.3{+-}3.6. At 90% confidence we set an upper limit of E{sup 2}{Phi}{sub 90%CL}<3.6x10{sup -7} GeV{center_dot}cm{sup -2}{center_dot}s{sup -1}{center_dot}sr{sup -1} on the diffuse flux of neutrinos of all flavors in the energy range between 24 TeV and 6.6 PeV assuming that {Phi}{proportional_to}E{sup -2} and the flavor composition of the {nu}{sub e} ratio {nu}{sub {mu}} ratio {nu}{sub {tau}} flux is 1 ratio 1 ratio 1 at the Earth. The atmospheric neutrino analysis was optimized for lower energies. A total of 12 events were observed with energies above 5 TeV. The observed number of events is consistent with the expected background, within the uncertainties.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
21607741
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 84; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.84.072001; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASTROPHYSICS; ELECTRONS; FLAVOR MODEL; NEUTRINO DETECTION; NEUTRINOS; PEV RANGE; TEV RANGE; COMPOSITE MODELS; DETECTION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; LEPTONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; PARTICLE MODELS; PHYSICS; QUARK MODEL; RADIATION DETECTION

Citation Formats

Abbasi, R., Aguilar, J. A., Andeen, K., Baker, M., BenZvi, S., Berghaus, P., Braun, J., Chirkin, D., Desiati, P., Diaz-Velez, J. C., Dumm, J. P., Eisch, J., Gladstone, L., Grullon, S., Halzen, F., Hill, G. C., Hoshina, K., Jacobsen, J., Karle, A., and Kelley, J. L. First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector. United States: N. p., 2011. Web. doi:10.1103/PHYSREVD.84.072001.
Abbasi, R., Aguilar, J. A., Andeen, K., Baker, M., BenZvi, S., Berghaus, P., Braun, J., Chirkin, D., Desiati, P., Diaz-Velez, J. C., Dumm, J. P., Eisch, J., Gladstone, L., Grullon, S., Halzen, F., Hill, G. C., Hoshina, K., Jacobsen, J., Karle, A., & Kelley, J. L. First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector. United States. doi:10.1103/PHYSREVD.84.072001.
Abbasi, R., Aguilar, J. A., Andeen, K., Baker, M., BenZvi, S., Berghaus, P., Braun, J., Chirkin, D., Desiati, P., Diaz-Velez, J. C., Dumm, J. P., Eisch, J., Gladstone, L., Grullon, S., Halzen, F., Hill, G. C., Hoshina, K., Jacobsen, J., Karle, A., and Kelley, J. L. Sat . "First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector". United States. doi:10.1103/PHYSREVD.84.072001.
@article{osti_21607741,
title = {First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector},
author = {Abbasi, R. and Aguilar, J. A. and Andeen, K. and Baker, M. and BenZvi, S. and Berghaus, P. and Braun, J. and Chirkin, D. and Desiati, P. and Diaz-Velez, J. C. and Dumm, J. P. and Eisch, J. and Gladstone, L. and Grullon, S. and Halzen, F. and Hill, G. C. and Hoshina, K. and Jacobsen, J. and Karle, A. and Kelley, J. L.},
abstractNote = {We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16 TeV remained after event selections in the diffuse analysis, with an expected total background contribution of 8.3{+-}3.6. At 90% confidence we set an upper limit of E{sup 2}{Phi}{sub 90%CL}<3.6x10{sup -7} GeV{center_dot}cm{sup -2}{center_dot}s{sup -1}{center_dot}sr{sup -1} on the diffuse flux of neutrinos of all flavors in the energy range between 24 TeV and 6.6 PeV assuming that {Phi}{proportional_to}E{sup -2} and the flavor composition of the {nu}{sub e} ratio {nu}{sub {mu}} ratio {nu}{sub {tau}} flux is 1 ratio 1 ratio 1 at the Earth. The atmospheric neutrino analysis was optimized for lower energies. A total of 12 events were observed with energies above 5 TeV. The observed number of events is consistent with the expected background, within the uncertainties.},
doi = {10.1103/PHYSREVD.84.072001},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}