Roa J E, Latimer D C, Ernst D J
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA.
Phys Rev Lett. 2009 Aug 7;103(6):061804. doi: 10.1103/PhysRevLett.103.061804. Epub 2009 Aug 5.
An atmospheric neutrino oscillation tool that uses full three-neutrino oscillation probabilities and a full three-neutrino treatment of the Mikheyev-Smirnov-Wolfenstein effect, together with an analysis of the K2K, MINOS, and CHOOZ data, is used to examine the bounds on theta_{13}. The recent, more finely binned, Super-K atmospheric data are employed. For L/E_{nu} greater, similar 10;{4} km/GeV, we previously found significant linear in theta_{13} terms. This analysis finds theta_{13} bounded from above by the atmospheric data while bounded from below by CHOOZ. The origin of this result arises from data in the previously mentioned very long baseline region; here, matter effects conspire with terms linear in theta_{13} to produce asymmetric bounds on theta_{13}. Assuming CP conservation, we find theta_{13} = -0.07_{-0.11};{+0.18} (90% C.L.).
一种大气中微子振荡工具，它使用完整的三 neutrino 振荡概率以及对米赫耶夫 - 斯米尔诺夫 - 沃尔芬斯坦效应的完整三 neutrino 处理，连同对 K2K、MINOS 和 CHOOZ 数据的分析，被用于检验 θ₁₃ 的边界。采用了近期分箱更精细的超级神冈大气数据。对于 L/Eₙᵤ 大于约 10⁴ km/GeV 的情况，我们之前发现了与 θ₁₃ 相关的显著线性项。该分析发现，大气数据给出了 θ₁₃ 的上限，而 CHOOZ 给出了下限。这一结果源于上述非常长基线区域的数据；在此，物质效应与 θ₁₃ 的线性项共同作用，产生了 θ₁₃ 的不对称边界。假设 CP 守恒，我们发现 θ₁₃ = -0.07₋₀.₁₁⁺₀.₁₈（90% 置信水平）。
