Enhanced Constraints on $θ_{13}$ from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND

Enhanced Constraints on $θ_{13}$ from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND. Gando, A., Gando, Y., Ichimura, K., Ikeda, H., Inoue, K., Kibe, Y., Kishimoto, Y., Koga, M., Minekawa, Y., Mitsui, T., Morikawa, T., Nagai, N., Nakajima, K., Nakamura, K., Narita, K., Shimizu, I., Shimizu, Y., Shirai, J., Suekane, F., Suzuki, A., Takahashi, H., Takahashi, N., Takemoto, Y., Tamae, K., Watanabe, H., Xu, B. D., Yabumoto, H., Yoshida, H., Yoshida, S., Enomoto, S., Kozlov, A., Murayama, H., Grant, C., Keefer, G., Piepke, A., Banks, T. I., Bloxham, T., Detwiler, J. A., Freedman, S. J., Fujikawa, B. K., Han, K., Kadel, R., O'Donnell, T., Steiner, H. M., Dwyer, D. A., McKeown, R. D., Zhang, C., Berger, B. E., Lane, C. E., Maricic, J., Miletic, T., Batygov, M., Learned, J. G., Matsuno, S., Sakai, M., Horton-Smith, G. A., Downum, K. E., Gratta, G., Efremenko, Y., Perevozchikov, O., Karwowski, H. J., Markoff, D. M., Tornow, W., Heeger, K. M., & Decowski, M. P. 2010. cite arxiv:1009.4771 Comment: 10 pages, 7 figures
$Enhanced Constraints on $θ_{13}$ from A Three-Flavor Oscillation Analysis of Reactor Antineutrinos at KamLAND [link]$ Paper abstract bibtex

We present new constraints on the neutrino oscillation parameters $Δ m^{2}_{21}$, $θ_{12}$, 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 $3.49 × 10^{32}$ target-proton-year. Under the assumption of ıt CPT invariance, a two-flavor analysis ($θ_{13} = 0$) of the KamLAND and solar data yields the best-fit values $\tan^{2} θ_{12} = 0.444^{+0.036}_{-0.030}$ and $Δ m^{2}_{21} = 7.50^{+0.19}_{-0.20} × 10^{-5} {m̊ eV}^{2}$; a three-flavor analysis with $θ_{13}$ as a free parameter yields the best-fit values $\tan^{2} θ_{12} = 0.452^{+0.035}_{-0.033}$, $Δ m^{2}_{21} = 7.50^{+0.19}_{-0.20} × 10^{-5} {m̊ eV}^{2}$, 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 $\sin^{2} θ_{13} = 0.017^{+0.010}_{-0.009}$, a nonzero value at the 93% C.L. This finding will be further tested by upcoming accelerator and reactor experiments.

@article{Gando2010,
  abstract = {  We present new constraints on the neutrino oscillation parameters $\Delta
m^{2}_{21}$, $\theta_{12}$, and $\theta_{13}$ 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 {\it CPT} invariance, a two-flavor
analysis ({$\theta_{13} = 0$}) of the KamLAND and solar data yields the
best-fit values $\tan^{2} \theta_{12} = 0.444^{+0.036}_{-0.030}$ and $\Delta
m^{2}_{21} = 7.50^{+0.19}_{-0.20} \times 10^{-5} ~ {\rm eV}^{2}$; a
three-flavor analysis with $\theta_{13}$ as a free parameter yields the
best-fit values $\tan^{2} \theta_{12} = 0.452^{+0.035}_{-0.033}$, $\Delta
m^{2}_{21} = 7.50^{+0.19}_{-0.20} \times 10^{-5} ~ {\rm eV}^{2}$, and $\sin^{2}
\theta_{13} = 0.020^{+0.016}_{-0.016}$. This $\theta_{13}$ interval is
consistent with other recent work combining the CHOOZ, atmospheric and
long-baseline accelerator experiments. We also present a new global
$\theta_{13}$ analysis, incorporating the CHOOZ, atmospheric and accelerator
data, which indicates $\sin^{2} \theta_{13} = 0.017^{+0.010}_{-0.009}$, a
nonzero value at the 93% C.L. This finding will be further tested by upcoming
accelerator and reactor experiments.
},
  added-at = {2010-10-07T23:35:14.000+0200},
  author = {Gando, A. and Gando, Y. and Ichimura, K. and Ikeda, H. and Inoue, K. and Kibe, Y. and Kishimoto, Y. and Koga, M. and Minekawa, Y. and Mitsui, T. and Morikawa, T. and Nagai, N. and Nakajima, K. and Nakamura, K. and Narita, K. and Shimizu, I. and Shimizu, Y. and Shirai, J. and Suekane, F. and Suzuki, A. and Takahashi, H. and Takahashi, N. and Takemoto, Y. and Tamae, K. and Watanabe, H. and Xu, B. D. and Yabumoto, H. and Yoshida, H. and Yoshida, S. and Enomoto, S. and Kozlov, A. and Murayama, H. and Grant, C. and Keefer, G. and Piepke, A. and Banks, T. I. and Bloxham, T. and Detwiler, J. A. and Freedman, S. J. and Fujikawa, B. K. and Han, K. and Kadel, R. and O'Donnell, T. and Steiner, H. M. and Dwyer, D. A. and McKeown, R. D. and Zhang, C. and Berger, B. E. and Lane, C. E. and Maricic, J. and Miletic, T. and Batygov, M. and Learned, J. G. and Matsuno, S. and Sakai, M. and Horton-Smith, G. A. and Downum, K. E. and Gratta, G. and Efremenko, Y. and Perevozchikov, O. and Karwowski, H. J. and Markoff, D. M. and Tornow, W. and Heeger, K. M. and Decowski, M. P.},
  biburl = {https://www.bibsonomy.org/bibtex/29488f4f24aa118838e6e249931cf9d61/decowski},
  description = {Enhanced Constraints on $\theta_{13}$ from A Three-Flavor Oscillation
  Analysis of Reactor Antineutrinos at KamLAND},
  interhash = {31a690a463ea882677c879087eb4dc81},
  intrahash = {9488f4f24aa118838e6e249931cf9d61},
  keywords = {kamland reactor antineutrinos theta13},
  note = {cite arxiv:1009.4771
Comment: 10 pages, 7 figures},
  timestamp = {2010-10-07T23:35:14.000+0200},
  title = {Enhanced Constraints on $\theta_{13}$ from A Three-Flavor Oscillation
  Analysis of Reactor Antineutrinos at KamLAND},
  url = {http://arxiv.org/abs/1009.4771},
  year = 2010
}

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