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arXiv 2201.10412hep-phhep-ex
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中微子非标准相互作用下NO $ν$ A和T2K张力的解析

Resolving the NO$ν$A and T2K tension in the presence of Neutrino Non-Standard interactions

Sabya Sachi Chatterjee, Antonio Palazzo

摘要:

两个长基线加速器实验NO $ν$ A和T2K的当前数据显示了超过90 $\%$ C.L.的张力。对于2个自由度,在中微子正常有序(NO)的情况下,在标准CP相$δ_{\mathrm {CP}}$的测定中。NO $ν$ A测量接近$δ_{\mathrm {CP}} \sim 0.8 π$的值,而T2 K优选$δ_{\mathrm {CP}} \sim 1.4 π$的值。我们表明,这样的紧张局势可以解决,如果一个假设存在的中性流的非标准相互作用(NSI)的中微子涉及的味道改变型$e-μ$或$e-τ$部门与耦合$|\varepsilon_{eμ}| \sim |\varepsilon_{eτ}|\sim 0.2$。值得注意的是,我们的分析表明,在存在这样的NSI的情况下,两个实验都指向标准CP相位$δ_{\mathrm {CP}} \sim 3π/2$的相同的共同值,从而指示标准$3ν$框架中的最大CP违反。我们还表明,新的CP阶段$ϕ_{eμ}$或$ ϕ_{eτ}$的最佳拟合值接近$\sim 3π/2$,因此指向NSI部门的最大CP违规。

英文摘要:

The current data of the two long-baseline accelerator experiments NO$ν$A and T2K, shows a tension at more than 90$\%$ C.L. for 2 degrees of freedom, in the determination of the standard CP-phase $δ_{\mathrm {CP}}$ in case of neutrino normal ordering (NO). NO$ν$A measures the value close to $δ_{\mathrm {CP}} \sim 0.8 π$, while T2K prefers the value of $δ_{\mathrm {CP}} \sim 1.4 π$. We show that such a tension can be resolved if one hypothesizes the existence of neutral-current non-standard interactions (NSI) of neutrinos involving the flavor changing type $e-μ$ or the $e-τ$ sectors with couplings $|\varepsilon_{eμ}| \sim |\varepsilon_{eτ}|\sim 0.2$. Remarkably, our analyses show that in the presence of such NSI, both the experiments point towards the same common value of the standard CP-phase $δ_{\mathrm {CP}} \sim 3π/2$, thereby indicating towards the maximal CP-violation in the standard $3ν$ framework. We also show that the best fit values of the new CP-phases $ϕ_{eμ}$ or $ ϕ_{eτ}$ are close to $\sim 3π/2$, hence pointing towards the maximal CP-violation in the NSI sector.

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。

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