Abstract
The lepton mixing angle θ 13, the only unknown angle in the standard three-flavor neutrino mixing scheme, is finally measured by the recent reactor and accelerator neutrino experiments. We perform a combined analysis of the data coming from T2K, MINOS, Double Chooz, Daya Bay and RENO experiments and find sin2 2θ 13 = 0.096 ± 0.013(±0.040) at 1 σ (3 σ) CL and that the hypothesis θ 13 = 0 is now rejected at a significance level of 7.7 σ. We also discuss the near future expectation on the precision of the θ 13 determination by using expected data from these ongoing experiments.
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The T2K collaboration, Y. Itow et al., The JHF-Kamioka neutrino project, hep-ex/0106019 [INSPIRE].
V. Martemyanov, L. Mikaelyan, V. Sinev, V. Kopeikin and Y. Kozlov, The Kr2Det project: Search for mass 3 state contribution |U (e3)|2 to the electron neutrino using a one reactor-two detector oscillation experiment at Krasnoyarsk underground site, Phys. Atom. Nucl. 66 (2003) 1934 [hep-ex/0211070] [INSPIRE].
H. Minakata, H. Sugiyama, O. Yasuda, K. Inoue and F. Suekane, Reactor measurement of theta(13) and its complementarity to long baseline experiments, Phys. Rev. D 68 (2003) 033017 [Erratum ibid. D 70 (2004) 059901] [hep-ph/0211111] [INSPIRE].
Z. Maki, M. Nakagawa and S. Sakata, Remarks on the unified model of elementary particles, Prog. Theor. Phys. 28 (1962) 870 [INSPIRE].
K. Hiraide et al., Resolving θ 23 degeneracy by accelerator and reactor neutrino oscillation experiments, Phys. Rev. D 73 (2006) 093008 [hep-ph/0601258] [INSPIRE].
J. Burguet-Castell, M. Gavela, J. Gomez-Cadenas, P. Hernández and O. Mena, On the measurement of leptonic CP-violation, Nucl. Phys. B 608 (2001) 301 [hep-ph/0103258] [INSPIRE].
H. Minakata and H. Nunokawa, Exploring neutrino mixing with low-energy superbeams, JHEP 10 (2001) 001 [hep-ph/0108085] [INSPIRE].
G.L. Fogli and E. Lisi, Tests of three flavor mixing in long baseline neutrino oscillation experiments, Phys. Rev. D 54 (1996) 3667 [hep-ph/9604415] [INSPIRE].
T2K collaboration, K. Abe et al., Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam, Phys. Rev. Lett. 107 (2011) 041801 [arXiv:1106.2822] [INSPIRE].
CHOOZ collaboration, M. Apollonio et al., Search for neutrino oscillations on a long baseline at the CHOOZ nuclear power station, Eur. Phys. J. C 27 (2003) 331 [hep-ex/0301017] [INSPIRE].
F. Boehm et al., Final results from the Palo Verde neutrino oscillation experiment, Phys. Rev. D 64 (2001) 112001 [hep-ex/0107009] [INSPIRE].
K2K collaboration, S. Yamamoto et al., An Improved search for nu μ → ν e oscillation in a long-baseline accelerator experiment, Phys. Rev. Lett. 96 (2006) 181801 [hep-ex/0603004] [INSPIRE].
The MINOS collaboration, P. Adamson et al., New constraints on muon-neutrino to electron-neutrino transitions in MINOS, Phys. Rev. D 82 (2010) 051102 [arXiv:1006.0996] [INSPIRE].
MINOS collaboration, P. Adamson et al., Improved search for muon-neutrino to electron-neutrino oscillations in MINOS, Phys. Rev. Lett. 107 (2011) 181802 [arXiv:1108.0015] [INSPIRE].
Double CHOOZ collaboration, F. Ardellier et al., Double CHOOZ: a search for the neutrino mixing angle θ 13, hep-ex/0606025 [INSPIRE].
Double CHOOZ collaboration, Y. Abe et al., Indication for the disappearance of reactor electron antineutrinos in the Double CHOOZ experiment, Phys. Rev. Lett. 108 (2012) 131801 [arXiv:1112.6353] [INSPIRE].
H. de Kerrect, First results form the Double-Chooz experiments, talk given at the 6th International Workshop on Low energy neutrino physics, November 9-12, Seoul National University, South Korea (2011), http://workshop.kias.re.kr/lownu11/.
Daya-Bay collaboration, X. Guo et al., A precision measurement of the neutrino mixing angle θ 13 using reactor antineutrinos at Daya-Bay, hep-ex/0701029 [INSPIRE].
DAYA-BAY collaboration, F. An et al., Observation of electron-antineutrino disappearance at Daya Bay, arXiv:1203.1669 [INSPIRE].
RENO collaboration, J. Ahn et al., RENO: an experiment for neutrino oscillation parameter θ 13 using reactor neutrinos at Yonggwang, arXiv:1003.1391 [INSPIRE].
K.K. Joo, Status of the RENO Reactor Neutrino Experiment, talk given at the 6th International Workshop on Low energy neutrino physics, November 9-12, Seoul National University, South Korea (2011), http://workshop.kias.re.kr/lownu11/.
J.K. Ahn et al., Observation of reactor electron antineutrino disappearance in the RENO experiment, arXiv:1204.0626 [INSPIRE].
G. Fogli, E. Lisi, A. Marrone, A. Palazzo and A. Rotunno, Hints of θ 13 > 0 from global neutrino data analysis, Phys. Rev. Lett. 101 (2008) 141801 [arXiv:0806.2649] [INSPIRE].
T. Schwetz, M. Tortola and J.W. Valle, Three-flavour neutrino oscillation update, New J. Phys. 10 (2008) 113011 [arXiv:0808.2016] [INSPIRE].
M. Gonzalez-Garcia, M. Maltoni and J. Salvado, Updated global fit to three neutrino mixing: status of the hints of θ 13 > 0, JHEP 04 (2010) 056 [arXiv:1001.4524] [INSPIRE].
G. Fogli, E. Lisi, A. Marrone, A. Palazzo and A. Rotunno, Evidence of θ 13 > 0 from global neutrino data analysis, Phys. Rev. D 84 (2011) 053007 [arXiv:1106.6028] [INSPIRE].
T. Schwetz, M. Tortola and J. Valle, Where we are on θ 13: addendum to ’Global neutrino data and recent reactor fluxes: status of three-flavour oscillation parameters’, New J. Phys. 13 (2011) 109401 [arXiv:1108.1376] [INSPIRE].
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].
K. Abe et al., Letter of Intent: The hyper-Kamiokande experiment — detector design and physics potential, arXiv:1109.3262 [INSPIRE].
J. Kopp, P.A. Machado and S.J. Parke, Interpretation of MINOS data in terms of non-standard neutrino interactions, Phys. Rev. D 82 (2010) 113002 [arXiv:1009.0014] [INSPIRE].
J. Maeda and T. Matsubara, private communication.
T. Mueller et al., Improved predictions of reactor antineutrino spectra, Phys. Rev. C 83 (2011) 054615 [arXiv:1101.2663] [INSPIRE].
P. Huber, On the determination of anti-neutrino spectra from nuclear reactors, Phys. Rev. C 84 (2011) 024617 [Erratum ibid. C 85 (2012) 029901] [arXiv:1106.0687] [INSPIRE].
Super-Kamiokande collaboration, R. Wendell et al., Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II and III, Phys. Rev. D 81 (2010) 092004 [arXiv:1002.3471] [INSPIRE].
MINOS collaboration, P. Adamson et al., Measurement of the neutrino mass splitting and flavor mixing by MINOS, Phys. Rev. Lett. 106 (2011) 181801 [arXiv:1103.0340] [INSPIRE].
H. Minakata and H. Sugiyama, Exploring leptonic CP-violation by reactor and neutrino superbeam experiments, Phys. Lett. B 580 (2004) 216 [hep-ph/0309323] [INSPIRE].
T. Kajita, Recent results from atmospheric neutrino experiments, Nucl. Phys. (Proc. Suppl.) 217 (2011) 157.
Super-Kamiokande collaboration, Y. Takeuchi, Results from Super-Kamiokande, arXiv:1112.3425 [INSPIRE].
P. Huber, M. Lindner, T. Schwetz and W. Winter, First hint for CP-violation in neutrino oscillations from upcoming superbeam and reactor experiments, JHEP 11 (2009) 044 [arXiv:0907.1896] [INSPIRE].
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ArXiv ePrint: 1111.3330
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Machado, P.A.N., Minakata, H., Nunokawa, H. et al. Combining accelerator and reactor measurements of θ 13: the first result. J. High Energ. Phys. 2012, 23 (2012). https://doi.org/10.1007/JHEP05(2012)023
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DOI: https://doi.org/10.1007/JHEP05(2012)023