Final results of the search for νμνe oscillations with the OPERA detector in the CNGS beam

Abstract

The OPERA experiment has discovered the tau neutrino appearance in the CNGS muon neutrino beam, in agreement with the 3 neutrino flavour oscillation hypothesis. The OPERA neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by electrons can be distinguished from those induced by π0s, thus allowing the detection of charged current interactions of electron neutrinos. In this paper the results of the search for electron neutrino events using the full dataset are reported. An improved method for the electron neutrino energy estimation is exploited. Data are compatible with the 3 neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 neutrino mixing model, in which an additional mass eigenstate m4 is introduced. At high Δm 241 (≳0.1 eV2), an upper limit on sin2 2θμe is set to 0.021 at 90% C.L. and Δm 241  ≳ 4 × 10− 3 eV2 is excluded for maximal mixing in appearance mode.

A preprint version of the article is available at ArXiv.

References

  1. [1]

    OPERA collaboration, M. Guler at al., An appearance experiment to search for νμν τ oscillations in the CNGS beam. Experimental proposal, SPSC-2000-028 (2000) [CERN-SPSC-P-318] [LNGS-P25-00].

  2. [2]

    R. Acquafredda et al., The OPERA experiment in the CERN to Gran Sasso neutrino beam, 2009 JINST 4 P04018 [INSPIRE].

  3. [3]

    G. Acquistapace et al., The CERN neutrino beam to Gran Sasso (NGS), CERN-98-02 (1998) [INFN/AE-98/05].

  4. [4]

    R. Bailey et al., The CERN neutrino beam to Gran Sasso (NGS). Addendum to report CERN-98-02, INFN/AE-98/05, CERN-SL/99-034(DI) (1999) [INFN/AE-99/05].

  5. [5]

    OPERA collaboration, N. Agafonova et al., Discovery of τ neutrino appearance in the CNGS neutrino beam with the OPERA experiment, Phys. Rev. Lett. 115 (2015) 121802 [arXiv:1507.01417] [INSPIRE].

  6. [6]

    OPERA collaboration, N. Agafonova et al., Search for ν μν e oscillations with the OPERA experiment in the CNGS beam, JHEP 07 (2013) 004 [arXiv:1303.3953] [INSPIRE].

  7. [7]

    LSND collaboration, A. Aguilar et al., Evidence for neutrino oscillations from the observation of anti-neutrino(electron) appearance in a anti-neutrino(muon) beam, Phys. Rev. D 64 (2001) 112007 [hep-ex/0104049] [INSPIRE].

  8. [8]

    MiniBooNE collaboration, A.A. Aguilar-Arevalo et al., A combined ν μν e and \( {\overline{\nu}}_{\mu}\to {\overline{\nu}}_e \) oscillation analysis of the MiniBooNE excesses, arXiv:1207.4809 [FERMILAB-PUB-12-394-AD-PPD] [LA-UR-12-23041].

  9. [9]

    G. Mention et al., The reactor antineutrino anomaly, Phys. Rev. D 83 (2011) 073006 [arXiv:1101.2755] [INSPIRE].

    ADS  Google Scholar 

  10. [10]

    F. Kaether et al., Reanalysis of the GALLEX solar neutrino flux and source experiments, Phys. Lett. B 685 (2010) 47 [arXiv:1001.2731] [INSPIRE].

    Article  ADS  Google Scholar 

  11. [11]

    J.N. Abdurashitov et al., Measurement of the response of a Ga solar neutrino experiment to neutrinos from an Ar-37 source, Phys. Rev. C 73 (2006) 045805 [nucl-ex/0512041] [INSPIRE].

  12. [12]

    K. Niu, E. Mikumo and Y. Maeda, A possible decay in flight of a new type particle, Prog. Theor. Phys. 46 (1971) 1644 [INSPIRE].

    Article  ADS  Google Scholar 

  13. [13]

    OPERA collaboration, N. Agafonova et al., Determination of the muon charge sign with the dipolar spectrometers of the OPERA experiment, 2016 JINST 11 P07022 [arXiv:1404.5933] [INSPIRE].

  14. [14]

    Y.A. Gornushkin, S.G. Dmitrievsky and A.V. Chukanov, Locating of the neutrino interaction vertex with the help of electronic detectors in the OPERA experiment, Phys. Part. Nucl. Lett. 12 (2015) 89.

    Article  Google Scholar 

  15. [15]

    OPERA collaboration, N. Agafonova et al., Observation of a first ν τ candidate in the OPERA experiment in the CNGS beam, Phys. Lett. B 691 (2010) 138 [arXiv:1006.1623] [INSPIRE].

  16. [16]

    OPERA collaboration, N. Agafonova et al., Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays, Eur. Phys. J. C 74 (2014) 2986 [arXiv:1404.4357] [INSPIRE].

  17. [17]

    OPERA collaboration, N. Agafonova et al., New results on ν μν τ appearance with the OPERA experiment in the CNGS beam, JHEP 11 (2013) 036 [Erratum ibid. 04 (2014) 014] [arXiv:1308.2553] [INSPIRE].

  18. [18]

    A. Bertolin and N.T. Tran., OpCarac: an algorithm for the classification of the neutrino interactions recorded by the OPERA experiment, OPERA public note 100 (2009).

  19. [19]

    T.T. Böhlen et al., The FLUKA code: developments and challenges for high energy and medical applications, Nucl. Data Sheets 120 (2014) 211.

    Article  ADS  Google Scholar 

  20. [20]

    A. Ferrari, P. R. Sala, A. Fasso and J. Ranft, FLUKA: A multi-particle transport code, CERN-2005-010 (2005) [SLAC-R-773] [INFN-TC-05-11].

  21. [21]

    CNGS web site, http://proj-cngs.web.cern.ch/proj-cngs.

  22. [22]

    C. Andreopoulos et al., The GENIE neutrino Monte Carlo generator, Nucl. Instrum. Meth. A 614 (2010) 87 [arXiv:0905.2517] [INSPIRE].

    Article  ADS  Google Scholar 

  23. [23]

    C. Andreopoulos et al., The GENIE neutrino Monte Carlo generator: physics and user manual, arXiv:1510.05494 [INSPIRE].

  24. [24]

    Particle Data Group collaboration, C. Patrignani et al., Review of particle physics, Chin. Phys. C 40 (2016) 100001 [INSPIRE].

  25. [25]

    E. Longo and I. Sestili, Monte Carlo calculation of photon initiated electromagnetic showers in lead glass, Nucl. Instrum. Meth. 128 (1975) 283 [Erratum ibid. 135 (1976) 587] [INSPIRE].

  26. [26]

    G. Grindhammer and S. Peters, The parameterized simulation of electromagnetic shower in homogeneous and sampling calorimeters, hep-ex/0001020.

  27. [27]

    C. Leroy and P. Rancoita, Physics of cascading shower generation and propagation in matter: Principles of high-energy, ultrahigh-energy and compensating calorimetry, Rept. Prog. Phys. 63 (2000) 505 [INSPIRE].

    Article  ADS  Google Scholar 

  28. [28]

    S. Zemskova, ν μν e oscillations search in the OPERA experiment, Phys. Part. Nucl. 47 (2016) 1003 [INSPIRE].

  29. [29]

    G.J. Feldman and R.D. Cousins, A Unified approach to the classical statistical analysis of small signals, Phys. Rev. D 57 (1998) 3873 [physics/9711021] [INSPIRE].

  30. [30]

    G. Cowan, Statistical data analysis, Clarendon Press, Oxford U.K. (1998).

    Google Scholar 

  31. [31]

    NOMAD collaboration, P. Astier et al., Search for ν μν e oscillations in the NOMAD experiment, Phys. Lett. B 570 (2003) 19 [hep-ex/0306037] [INSPIRE].

  32. [32]

    KARMEN collaboration, B. Armbruster et al., Upper limits for neutrino oscillations \( {\overline{\nu}}_{\mu}\to {\overline{\nu}}_e \) from muon decay at rest, Phys. Rev. D 65 (2002) 112001 [hep-ex/0203021] [INSPIRE].

  33. [33]

    MINOS, Daya Bay collaboration, P. Adamson et al., Limits on active to sterile neutrino oscillations from disappearance searches in the MINOS, Daya Bay and Bugey-3 experiments, Phys. Rev. Lett. 117 (2016) 151801 [arXiv:1607.01177] [INSPIRE].

  34. [34]

    P. Huber, M. Lindner and W. Winter, Simulation of long-baseline neutrino oscillation experiments with GLoBES (General Long Baseline Experiment Simulator), Comput. Phys. Commun. 167 (2005) 195 [hep-ph/0407333] [INSPIRE].

  35. [35]

    P. Huber, J. Kopp, M. Lindner, M. Rolinec and W. Winter, New features in the simulation of neutrino oscillation experiments with GLoBES 3.0: General Long Baseline Experiment Simulator, Comput. Phys. Commun. 177 (2007) 432 [hep-ph/0701187] [INSPIRE].

  36. [36]

    A.M. Dziewonski and D.L. Anderson, Preliminary reference Earth model, Phys. Earth Planet. Interiors 25 (1981) 297.

    Article  ADS  Google Scholar 

  37. [37]

    F.D. Stacey and P.M. Davis, Physics of the Earth, 4th edition, Cambridge University Press, Cambridge U.K. (2008).

  38. [38]

    Planck collaboration, P.A.R. Ade et al., Planck 2015 results. XIII. Cosmological parameters, Astron. Astrophys. 594 (2016) A13 [arXiv:1502.01589] [INSPIRE].

Download references

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Author information

Affiliations

Authors

Consortia

Corresponding authors

Correspondence to M. Tenti or S. Vasina.

Additional information

ArXiv ePrint: 1803.11400

Deceased (A. Ljubicic)

Rights and permissions

This article is published under an open access license. Please check the 'Copyright Information' section for details of this license and what re-use is permitted. If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and re-use information, please contact the Rights and Permissions team.

About this article

Verify currency and authenticity via CrossMark

Cite this article

The OPERA collaboration., Agafonova, N., Aleksandrov, A. et al. Final results of the search for νμνe oscillations with the OPERA detector in the CNGS beam. J. High Energ. Phys. 2018, 151 (2018). https://doi.org/10.1007/JHEP06(2018)151

Download citation

Keywords

  • Neutrino Detectors and Telescopes (experiments)
  • Oscillation