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Constraints on $θ_{13}$ from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND

A. Gando¹, Y. Gando¹, K. Ichimura¹, H. Ikeda¹, K. Inoue^1,2, Y. Kibe^1,*, Y. Kishimoto¹, M. Koga^1,2, Y. Minekawa¹ et al. (The KamLAND Collaboration)

Y. Minekawa¹, T. Mitsui¹, T. Morikawa¹, N. Nagai¹, K. Nakajima¹, K. Nakamura^1,2, K. Narita¹, I. Shimizu¹, Y. Shimizu¹, J. Shirai¹, F. Suekane¹, A. Suzuki¹, H. Takahashi¹, N. Takahashi¹, Y. Takemoto¹, K. Tamae¹, H. Watanabe¹, B. D. Xu¹, H. Yabumoto¹, H. Yoshida¹, S. Yoshida¹, S. Enomoto^2,†, A. Kozlov², H. Murayama^2,3, C. Grant⁵, G. Keefer^4,‡, A. Piepke^2,4, T. I. Banks³, T. Bloxham³, J. A. Detwiler³, S. J. Freedman^2,3, B. K. Fujikawa^2,3, K. Han³, R. Kadel³, T. O’Donnell³, H. M. Steiner³, D. A. Dwyer⁵, R. D. McKeown⁵, C. Zhang⁵, B. E. Berger⁶, C. E. Lane⁷, J. Maricic⁷, T. Miletic^7,§, M. Batygov^8,∥, J. G. Learned⁸, S. Matsuno⁸, M. Sakai⁸, G. A. Horton-Smith^2,9, K. E. Downum¹⁰, G. Gratta¹⁰, Y. Efremenko^2,11, O. Perevozchikov^11,¶, H. J. Karwowski¹², D. M. Markoff¹², W. Tornow¹², K. M. Heeger^2,13, and M. P. Decowski^2,3,14 (The KamLAND Collaboration)

¹Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
²Institute for the Physics and Mathematics of the Universe, Tokyo University, Kashiwa 277-8568, Japan
³Physics Department, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁴Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
⁵W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA
⁶Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
⁷Physics Department, Drexel University, Philadelphia, Pennsylvania 19104, USA
⁸Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
⁹Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
¹⁰Physics Department, Stanford University, Stanford, California 94305, USA
¹¹Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
¹²Triangle Universities Nuclear Laboratory and Physics Departments, Duke University, Durham, North Carolina 27708, USA;North Carolina Central University, Durham, North Carolina 27707, USA; and the University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
¹³Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
¹⁴Nikhef, Science Park 105, 1098 XG Amsterdam, the Netherlands

^*Present address: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
^†Also at Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
^‡Present address: Lawrence Livermore National Laboratory, Livermore, California 94550, USA
^§Present address: Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Road, Glassboro, New Jersey 08028, USA
^∥Present address: SNOLAB, Lively, ON P3Y 1N2, Canada
^¶Present address: Department of Physics, University of South Dakota, 414 E. Clark St., Vermillion, South Dakota 57069, USA

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Phys. Rev. D 83, 052002 – Published 4 March, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.052002

Abstract

We present new constraints on the neutrino oscillation parameters $Δ m_{21}^{2}$ , $θ_{12}$ , and $θ_{13}$ from a three-flavor analysis of solar and KamLAND data. The KamLAND data set includes data acquired following a radiopurity upgrade and amounts to a total exposure of $3.49 \times 10^{32}$ target-proton-year. Under the assumption of $C P T$ invariance, a two-flavor analysis ( $θ_{13} = 0$ ) of the KamLAND and solar data yields the best-fit values ${tan }^{2} θ_{12} = {0.444}_{- 0.030}^{+ 0.036}$ and $Δ m_{21}^{2} = {7.50}_{- 0.20}^{+ 0.19} \times 10^{- 5} {eV}^{2}$ ; a three-flavor analysis with $θ_{13}$ as a free parameter yields the best-fit values ${tan }^{2} θ_{12} = {0.452}_{- 0.033}^{+ 0.035}$ , $Δ m_{21}^{2} = {7.50}_{- 0.20}^{+ 0.19} \times 10^{- 5} {eV}^{2}$ , and ${sin }^{2} θ_{13} = {0.020}_{- 0.016}^{+ 0.016}$ . This $θ_{13}$ interval is consistent with other recent work combining the CHOOZ, atmospheric and long-baseline accelerator experiments. We also present a new global $θ_{13}$ analysis, incorporating the CHOOZ, atmospheric, and accelerator data, which indicates ${sin }^{2} θ_{13} = {0.009}_{- 0.007}^{+ 0.013}$ . A nonzero value is suggested, but only at the 79% C.L.

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Constraints on $θ_{13}$ from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND

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Constraints on θ13 from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND

Abstract

Article Text

References (47)

Constraints on $θ_{13}$ from a three-flavor oscillation analysis of reactor antineutrinos at KamLAND