arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1012.0360hep-ph
收藏

2-3混合和质量分裂:大气中微子和磁化谱仪

The 2-3 mixing and mass split: atmospheric neutrinos and magnetized spectrometers

Abhijit Samanta, A. Yu. Smirnov

摘要:

本文研究了大气$ν_μ$和$\barν_μ$通量与2-3混合距最大值的偏差$|45^\circ - θ_{23}|$、$θ_{23}$ -八分圆和中微子质量分裂$Δm_{32}^2$的关系。推导了$θ_{23}-$偏差效应和八分圆不对称性的解析表达式。我们提出了保守的估计,这些参数的铁(磁化)量热计探测器(ICAL)的灵敏度。如果$| 45^\circ - θ_{23}| > 6^{\circ}$的暴露量为1 Mton $\cdot$/年,则ICAL可在高于3 $σ$置信水平下确定$θ_{23}$ -偏差。对于零或非常小的1-3混频,对八分圆的灵敏度低,但对于$θ_{13} > 3^\circ$,其可以被显著增强。ICAL可以测量$ν$和$\barν$通道中$Δm_{32}^2$的差异(CPT测试),其精确度为$0.8\times 10^{-4}$ eV $^2$(3 $σ$),暴露量为1 Mton $\cdot$ yr,并且可以在$>5σ$置信水平下排除当前MINOS结果。我们讨论了进一步提高磁化光谱仪灵敏度的可能途径。

英文摘要:

We study dependence of the atmospheric $ν_μ$ and $\barν_μ$ fluxes on the deviations of the 2-3 mixing from maximal, $|45^\circ - θ_{23}|$, on the $θ_{23}$-octant and on the neutrino mass splitting $Δm_{32}^2$. Analytic expressions for the $θ_{23}-$deviation effect and the octant asymmetry are derived. We present conservative estimations of sensitivities of the iron (magnetized) calorimeter detectors (ICAL) to these parameters. ICAL can establish the $θ_{23}$-deviation at higher than 3$σ$ confidence level if $| 45^\circ - θ_{23}| > 6^{\circ}$ with the exposure of 1 Mton$\cdot$yr. Sensitivity to the octant is low for zero or very small 1-3 mixing, but it can be substantially enhanced for $θ_{13} > 3^\circ$. ICAL can measure the difference of $Δm_{32}^2$ in $ν$ and $\barν$ channels (the CPT test) with accuracy $0.8\times 10^{-4}$ eV$^2$ (3$σ$) with 1 Mton$\cdot$yr exposure, and the present MINOS result can be excluded at $>5σ$ confidence level. We discuss possible ways to further improve sensitivity of the magnetized spectrometers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑