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

被引：232

作者：

Gando, A. ^{[1
]}

Gando, Y. ^{[1
]}

Ichimura, K. ^{[1
]}

Ikeda, H. ^{[1
]}

Inoue, K. ^{[1
,2
]}

Kibe, Y. ^{[1
]}

Kishimoto, Y. ^{[1
]}

Koga, M. ^{[1
,2
]}

Minekawa, Y. ^{[1
]}

Mitsui, T. ^{[1
]}

Morikawa, T. ^{[1
]}

Nagai, N. ^{[1
]}

Nakajima, K. ^{[1
]}

Nakamura, K. ^{[1
,2
]}

Narita, K. ^{[1
]}

Shimizu, I. ^{[1
]}

Shimizu, Y. ^{[1
]}

Shirai, J. ^{[1
]}

Suekane, F. ^{[1
]}

Suzuki, A. ^{[1
]}

Takahashi, H. ^{[1
]}

Takahashi, N. ^{[1
]}

Takemoto, Y. ^{[1
]}

Tamae, K. ^{[1
]}

Watanabe, H. ^{[1
]}

Xu, B. D. ^{[1
]}

Yabumoto, H. ^{[1
]}

Yoshida, H. ^{[1
]}

Yoshida, S. ^{[1
]}

Enomoto, S. ^{[2
]}

Kozlov, A. ^{[2
]}

Murayama, H. ^{[2
,3
,4
]}

Grant, C. ^{[6
]}

Keefer, G. ^{[5
]}

Piepke, A. ^{[2
,5
]}

Banks, T. I. ^{[3
,4
]}

Bloxham, T. ^{[3
,4
]}

Detwiler, J. A. ^{[3
,4
]}

Freedman, S. J. ^{[2
,3
,4
]}

Fujikawa, B. K. ^{[2
,3
,4
]}

Han, K. ^{[3
,4
]}

Kadel, R. ^{[3
,4
]}

O'Donnell, T. ^{[3
,4
]}

Steiner, H. M. ^{[3
,4
]}

Dwyer, D. A. ^{[6
]}

McKeown, R. D. ^{[6
]}

Zhang, C. ^{[6
]}

Berger, B. E. ^{[7
]}

Lane, C. E. ^{[8
]}

Maricic, J. ^{[8
]}

机构：

[1] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan

[2] Univ Tokyo, Inst Phys & Math Univ, Kashiwa, Chiba 2778568, Japan

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[5] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[6] CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA

[7] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA

[8] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[9] Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA

[10] Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA

[11] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[12] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[13] Duke Univ, Triangle Univ Nucl Lab, Durham, NC 27708 USA

[14] Duke Univ, Dept Phys, Durham, NC 27708 USA

[15] N Carolina Cent Univ, Durham, NC 27707 USA

[16] Univ N Carolina, Chapel Hill, NC 27599 USA

[17] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[18] Nikhef, NL-1098 XG Amsterdam, Netherlands

来源：

PHYSICAL REVIEW D | 2011年 / 83卷 / 05期

基金：

美国国家科学基金会;

关键词：

NEUTRINO OSCILLATIONS; SPECTRUM; FLUX;

D O I：

10.1103/PhysRevD.83.052002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new constraints on the neutrino oscillation parameters Delta m(21)(2), 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 x 10(32) target-proton-year. Under the assumption of 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(-0.030)(+0.036) and Delta m(21)(2) = 7.50(-0.20)(+0.19) x 10(-5) eV(2); a three-flavor analysis with theta(13) as a free parameter yields the best-fit values tan(2)theta(12) = 0.452(-0.033)(+0.035), Delta m(21)(2) = 7.50(-0.20)(+0.19) x 10(-5) 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) = 0.009(-0.007)(+0.013). A nonzero value is suggested, but only at the 79% C.L.

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