The Reactor Antineutrino Anomaly

Illustration of the short baseline reactor antineutrino anomaly. The experimental results are compared to the prediction without oscillation (ratio = 1). Published experimental errors and antineutrino spectra errors are added in quadrature. The mean averaged ratio including correlations is 0.943 ± 0.023. The red line shows a possible 3 active neutrino mixing solution, with sin2(2θ13) = 0.15. The blue line displays a solution including a new neutrino mass state, such as |∆m2new| = 2 eV2, sin2(2θ13) = 0.085, and sin2(2θnew,R) = 0.12. The lines are not a fit to the data, but just added for illustration purpose.

The Reactor Antineutrino Anomaly

Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. To a good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances 1.5 eV^2 (95%) and sin^2(2\theta_{new})=0.17(0.08) (95%). Constraints on the theta13 neutrino mixing angle are revised.

Reference: Phys. Rev. D 83, 073006 (2011)
Article posted on Arxiv 1101.2755

Citations: SPIRES, SLAC, Stanford record

Authors: G. Mention, M. Fechner, Th. Lasserre(*), Th. A. Mueller, D. Lhuillier, M. Cribier, A. Letourneau

* Corresponding author: thierry.lasserre@cea.fr

Talks & Seminars:

Seminar at the APC laboratory, Paris, 1st of February 2011, M. Fechner (.pdf)
Seminar at the LAPP, Annecy, 4th of February 2011, Th. Lasserre (.pdf)
Workshop on Sterile Neutrinos and on the Reactor (anti)-Neutrino Anomaly T.U.M, 8th of February 2011, M. Fechner (.pdf)
Seminar at the Irfu/SPP, Saclay, 28th of February 2011, G. Mention (.pdf)
XIV International Workshop on Neutrino Telescopes, Venice, 15-18 March 2011, Th. Lasserre (.pdf)
Rencontres de Moriond EW 2011, Electroweak Interactions and Unified Theories, 13-20 March 2011, La Thuile, G. Mention (.pdf)
Seminar at the Lawrence Livermore Laboratory, 5th of April 2011, Th. Lasserre ( Lasserre-California2011.pdf)
Seminar at the Lawrence Berkeley Laboratory, 6th of April 2011, Th. Lasserre ( Lasserre-California2011.pdf)
Seminar at the Stanford University, 7th of April 2011, Th. Lasserre (. Lasserre-California2011.pdf)
Seminar at the University of California, Irvine, 8th of April 2011, Th. Lasserre ( Lasserre-California2011.pdf)
Seminar at the LAL, Orsay, 18 of April 2011, M. Fechner
Beyond3Nu @ LNGS, 3-4 May 2011, Gran Sasso, Italy, D. Lhuillier
Talk at the Short-Baseline Neutrino Workshop, May 12?14, 2011, G. Mention
Talk at the 23rd Rencontres de Blois -Particle Physics and Cosmology, May 29 - June 3 2011, Th. Mueller
Review talk on Reactor neutrino esperiment and anomaly at EPS-HEP 2011, July 23th, 2011, Th. Lasserre
Talk at the Nufact 2011 Conference, Geneva, August, 2011, G. Mention
Talk at the TAUP 2011 Conference, Munich, September 6th 2011, Th. Lasserre
Talk at the AAP 2011 Workshop, Vienna, September 15-16, 2011, Th. Lasserre
Talk at the Workshop on Baryon & Lepton Number Violation workshop, BLV-2011, Gatlinburg (USA), 22-24th of september 2011, D. Lhuillier
Talk at the Workshop Frontiers on Neutrino Physics, APC (Paris), October 04-06th, 2011, Th. Lasserre
Talk at the Low Nu 2011 Workshop, Korea, November 9th-12th, Th. Mueller
Seminar at the ICCR institute, Tokyo-Kashiwa, Japan, December 05th, 2011, Th. Lasserre
Seminar at the KEK institute, Tsukuba, Japan, December 06th, 2011, Th. Lasserre
Seminar at the ICEPP institute, Tokyo University, Japan, December 07th, 2011, Th. Lasserre
Seminar at the RCNS institute, Tohoku University, Sendai, Japan, December 08th, 2011, Th. Lasserre
Talk at the Neutrino 2012 Conference, (Japan), « Testing the Reactor and Gallium Anomalies with Intense (Anti)Neutrino Emitters », June 2012
Invited talk at the TPC Paris, December 18^th 2012, Review talk on Sterile Neutrinos

Outreach:

Dossier Science et Vie sur l'hypothèse d'un 4è neutrino (file below)
De la fission nucléaire à l’hypothèse d’un 4e neutrino : l’effet papillon !
Butterfly effect - from nuclear fission to the hypothesis of a 4th neutrino!
NATURE article: The amazing disappearing antineutrino
Science article : The Sterile Neutrino: Fertile Concept or Dead End?

White Paper on Sterile Neutrinos

This white paper builds upon the Sterile Neutrinos at the Crossroads Workshop held at Virginia Tech, Septermber 26-28, 2011. The workshop was designed to examine the evidence for and against light sterile neutrinos coming from all areas of physics (particle, nuclear, astrophysics and cosmology) and to explore possible new experiments that could be mounted to resolve the issue. At the conclusion of the workshop the concensus view of the participants was that a white paper should be written to layout the theory, review the experimental and observational data and summarize proposals for possible future experiments relevant to the light sterile neutrino.

Outline and Section Editors

(Editors: Patrick Huber, Virginia Tech and Jon Link, Virginia Tech)

Theory and Motivation
(Section Editors: Gabriela Barenboim, Valencia and Werner Rodejohann, MPI Heidelberg)
Astrophysical Evidence
(Section Editors: Kev Abazajian, UC Irvine and Yvonne Wong, Aachen)
Evidence from Oscillation Experiments
(Section Editors: Joachim Kopp, FNAL and Bill Louis, LANL)
Global Picture
(Section Editors: Thierry Lasserre, CEA Saclay and Thomas Schwetz, MPI Heidelberg)
Requirements for Future Measurements
(Section Editors: Bonnie Fleming, Yale and Joe Formaggio, MIT)
Appendix: Possible Future Experiments
(Section Editors: Patrick Huber, Virginia Tech and Jon Link, Virginia Tech

Published as : arXiv:1204.5379

articleScienceetVie_neutrino_la_particule_01062012.pdf

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