Search for anomalies in the ν e appearance from a ν μ beam

  • M. Antonello
  • B. Baibussinov
  • P. Benetti
  • F. Boffelli
  • A. Bubak
  • E. Calligarich
  • N. Canci
  • S. Centro
  • A. Cesana
  • K. Cieślik
  • D. B. Cline
  • A. G. Cocco
  • A. Dabrowska
  • D. Dequal
  • A. Dermenev
  • R. Dolfini
  • A. Falcone
  • C. Farnese
  • A. Fava
  • A. Ferrari
  • G. Fiorillo
  • D. Gibin
  • S. Gninenko
  • A. Guglielmi
  • M. Haranczyk
  • J. Holeczek
  • M. Kirsanow
  • J. Kisiel
  • I. Kochanek
  • J. Lagoda
  • S. Mania
  • A. Menegolli
  • G. Meng
  • C. Montanari
  • S. Otwinowski
  • P. Picchi
  • F. Pietropaolo
  • P. Plonski
  • A. Rappoldi
  • G. L. Raselli
  • M. Rossella
  • C. Rubbia
  • P. Sala
  • A. Scaramelli
  • E. Segreto
  • F. Sergiampietri
  • D. Stefan
  • R. Sulej
  • M. Szarska
  • M. Terrani
  • M. Torti
  • F. Varanini
  • S. Ventura
  • C. Vignoli
  • H. G. Wang
  • X. Yang
  • A. Zalewska
  • A. Zani
  • K. Zaremba
Letter

Abstract

We report an updated result from the ICARUS experiment on the search for ν μ ν e anomalies with the CNGS beam, produced at CERN with an average energy of 20 GeV and traveling 730 km to the Gran Sasso Laboratory. The present analysis is based on a total sample of 1995 events of CNGS neutrino interactions, which corresponds to an almost doubled sample with respect to the previously published result. Four clear ν e events have been visually identified over the full sample, compared with an expectation of 6.4±0.9 events from conventional sources. The result is compatible with the absence of additional anomalous contributions. At 90 % and 99 % confidence levels, the limits to possible oscillated events are 3.7 and 8.3 respectively. The corresponding limit to oscillation probability becomes consequently 3.4×10−3 and 7.6×10−3, respectively. The present result confirms, with an improved sensitivity, the early result already published by the ICARUS Collaboration.

Keywords

Sterile Neutrino Neutrino Interaction Neutrino Beam Oscillation Probability Neutrino Data 

Notes

Acknowledgements

The ICARUS Collaboration acknowledges the fundamental contribution to the construction and operation of the experiment given by INFN and, in particular, by the LNGS Laboratory and its Directors. The Polish groups acknowledge the support of the Ministry of Science and Higher Education, and of National Science Centre, Poland. Finally, we thank CERN, in particular the CNGS staff, for the successful operation of the neutrino beam facility.

Open Access

This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • M. Antonello
    • 1
  • B. Baibussinov
    • 2
  • P. Benetti
    • 3
  • F. Boffelli
    • 3
  • A. Bubak
    • 11
  • E. Calligarich
    • 3
  • N. Canci
    • 1
  • S. Centro
    • 2
  • A. Cesana
    • 4
  • K. Cieślik
    • 5
  • D. B. Cline
    • 6
  • A. G. Cocco
    • 7
  • A. Dabrowska
    • 5
  • D. Dequal
    • 2
  • A. Dermenev
    • 8
  • R. Dolfini
    • 3
  • A. Falcone
    • 3
  • C. Farnese
    • 2
  • A. Fava
    • 2
  • A. Ferrari
    • 9
  • G. Fiorillo
    • 7
  • D. Gibin
    • 2
  • S. Gninenko
    • 8
  • A. Guglielmi
    • 2
  • M. Haranczyk
    • 5
  • J. Holeczek
    • 11
  • M. Kirsanow
    • 8
  • J. Kisiel
    • 11
  • I. Kochanek
    • 11
  • J. Lagoda
    • 10
  • S. Mania
    • 11
  • A. Menegolli
    • 3
  • G. Meng
    • 2
  • C. Montanari
    • 3
  • S. Otwinowski
    • 6
  • P. Picchi
    • 12
  • F. Pietropaolo
    • 2
  • P. Plonski
    • 14
  • A. Rappoldi
    • 3
  • G. L. Raselli
    • 3
  • M. Rossella
    • 3
  • C. Rubbia
    • 1
    • 13
    • 9
  • P. Sala
    • 4
  • A. Scaramelli
    • 4
  • E. Segreto
    • 1
  • F. Sergiampietri
    • 15
  • D. Stefan
    • 1
  • R. Sulej
    • 10
    • 9
  • M. Szarska
    • 5
  • M. Terrani
    • 4
  • M. Torti
    • 3
  • F. Varanini
    • 2
  • S. Ventura
    • 2
  • C. Vignoli
    • 1
  • H. G. Wang
    • 6
  • X. Yang
    • 6
  • A. Zalewska
    • 5
  • A. Zani
    • 3
  • K. Zaremba
    • 14
  1. 1.Laboratori Nazionali del Gran SassoINFNAssergiItaly
  2. 2.Dipartimento di Fisica e AstronomiaUniversità di Padova and INFNPadovaItaly
  3. 3.Dipartimento di FisicaUniversità di Pavia and INFNPaviaItaly
  4. 4.Politecnico di Milano and INFNMilanoItaly
  5. 5.H. Niewodniczański Institute of Nuclear PhysicsPolish Academy of ScienceKrakówPoland
  6. 6.Department of Physics and AstronomyUCLALos AngelesUSA
  7. 7.Dipartimento di Scienze FisicheUniversità Federico II di Napoli and INFNNapoliItaly
  8. 8.INR RASMoscowRussia
  9. 9.CERNGenevaSwitzerland
  10. 10.National Centre for Nuclear ResearchOtwock/SwierkPoland
  11. 11.Institute of PhysicsUniversity of SilesiaKatowicePoland
  12. 12.INFN Laboratori Nazionali di FrascatiFrascatiItaly
  13. 13.GSSIL’AquilaItaly
  14. 14.Institute for RadioelectronicsWarsaw University of TechnologyWarsawPoland
  15. 15.INFNPisaItaly

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