利用太阳中微子在XMASS- I中寻找奇异中微子-电子相互作用
Search for exotic neutrino-electron interactions using solar neutrinos in XMASS-I
摘要：
在XMASS-I液体氙探测器中，我们利用太阳中微子寻找了中微子毫电荷、中微子磁矩或暗光子可能产生的奇异中微子-电子相互作用。我们在711天的数据中没有观察到显著信号。在90%的置信水平下，假设三种中微子具有共同的毫电荷，我们得到中微子毫电荷的上限为5.4 PDMATHAMM 10 $^{-12} e$.我们还设定了依赖于味道的极限，假设相应的中微子味道是唯一携带毫电荷的中微子，对于$ν_e$是$7.3 \times 10^{-12} e$，对于$ν_μ$是$1.1 \times 10^{-11} e$，对于$ν_τ$是$1.1 \times 10^{-11} e$。这些限值是直接测量得到的最严格限值。我们还得到了中微子磁矩的上限为1.8 $\times$ 10 $^{-10}$玻尔磁子。此外，我们得到的$U(1)_{B-L}$模型中的暗光子的耦合常数的上限为1.3 $\times$ 10 $^{-6}$，如果暗光子质量是1 $\times 10^{-3}$ MeV $/c^{2}$，和8.8 $\times$ 10 $^{-5}$，如果它是10 MeV $/c^{2}$。
英文摘要：
We have searched for exotic neutrino-electron interactions that could be produced by a neutrino millicharge, by a neutrino magnetic moment, or by dark photons using solar neutrinos in the XMASS-I liquid xenon detector. We observed no significant signals in 711 days of data. We obtain an upper limit for neutrino millicharge of 5.4$\times$10$^{-12} e$ at 90\% confidence level assuming all three species of neutrino have common millicharge. We also set flavor dependent limits assuming the respective neutrino flavor is the only one carrying a millicharge, $7.3 \times 10^{-12} e$ for $ν_e$, $1.1 \times 10^{-11} e$ for $ν_μ$, and $1.1 \times 10^{-11} e$ for $ν_τ$. These limits are the most stringent yet obtained from direct measurements. We also obtain an upper limit for the neutrino magnetic moment of 1.8$\times$10$^{-10}$ Bohr magnetons. In addition, we obtain upper limits for the coupling constant of dark photons in the $U(1)_{B-L}$ model of 1.3$\times$10$^{-6}$ if the dark photon mass is 1$\times 10^{-3}$ MeV$/c^{2}$, and 8.8$\times$10$^{-5}$ if it is 10 MeV$/c^{2}$.
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